Quick Rooftop Antenna For Channel 2?
 

I apologize for making this about TV reception instead of radio, but I
did not know where to turn.

I live in Connecticut, about 100 miles from New York City, (102 miles
by the lattitude-longitude charts) and I am about a block from the
water, Long Island Sound.

I grew up in New York and am a NY Jets and Giants fan, which is
broadcast from the Empire State building. The Giants' games are
carried by one network, but the other Connecticut stations only carry
Patriots games, not the Jets.

The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

Does anyone have any ideas for a quick rooftop antenna I can put on a
pole and run into my house for the Jets game? I really don't mind if
the signal is somewhat snowy as long as I can make out what is
happening on the field-beats radio. Besides, this is football-
sometimes it snows for real and nobody complains, lol.

Anyway, any help would be greatly appreciated.

PS: I have seen websites for dipole antennas. My second question
is: If I make a dipole antenna, what if I mounted it on a piece of
cardboard or styrofoam for it's length, which cardboard or styrofoam
has aluminum foil on the reverse side? The aluminum foil would not
contact the dipole, and be separated from it by one quarter to one
inch, depending on material thickness. The reason I ask is if this
will cut off 180 degrees of reception, thereby improving the signal to
noise ratio, (I know a little about electronics as an audio hobbyist,
but very little about antennas even though I have tried to get a
grasp).

Quick Rooftop Antenna For Channel 2?
 

The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

I thought all VHF television transmission will be discontinued as of
February 2009. Building a VHF antenna would seem to be a
wasted effort. You need to think how you can receive the
same station on UHF digital. There are plenty of UHF antennas
available; you may also need a low noise, mast-head, pre-amplifier
to get a good signal.

Regards,

Frank

Quick Rooftop Antenna For Channel 2?
 

"JoeSch" wrote in message
...
I apologize for making this about TV reception instead of radio, but I
did not know where to turn.

I live in Connecticut, about 100 miles from New York City, (102 miles
by the lattitude-longitude charts) and I am about a block from the
water, Long Island Sound.

I grew up in New York and am a NY Jets and Giants fan, which is
broadcast from the Empire State building. The Giants' games are
carried by one network, but the other Connecticut stations only carry
Patriots games, not the Jets.

The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

Does anyone have any ideas for a quick rooftop antenna I can put on a
pole and run into my house for the Jets game? I really don't mind if
the signal is somewhat snowy as long as I can make out what is
happening on the field-beats radio. Besides, this is football-
sometimes it snows for real and nobody complains, lol.

Anyway, any help would be greatly appreciated.

PS: I have seen websites for dipole antennas. My second question
is: If I make a dipole antenna, what if I mounted it on a piece of
cardboard or styrofoam for it's length, which cardboard or styrofoam
has aluminum foil on the reverse side? The aluminum foil would not
contact the dipole, and be separated from it by one quarter to one
inch, depending on material thickness. The reason I ask is if this
will cut off 180 degrees of reception, thereby improving the signal to
noise ratio, (I know a little about electronics as an audio hobbyist,
but very little about antennas even though I have tried to get a
grasp).


Quick would be a rabbit ears set on the roof. Space your reflector at some
distance so that your antenna and reflector look more like an H. What you
really want though is a Rhombic antenna. Google that. It is a diamond
shaped wire antenna with some real gain.

Quick Rooftop Antenna For Channel 2?
 

On Sun, 7 Sep 2008 07:25:59 -0700 (PDT), JoeSch
wrote:

I live in Connecticut, about 100 miles from New York City, (102 miles
by the lattitude-longitude charts) and I am about a block from the
water, Long Island Sound.

I grew up in New York and am a NY Jets and Giants fan, which is
broadcast from the Empire State building.

Hi Joe,

The long answer is No.

The short answer is that with the transmission antenna at 1250 feet
(give or take), it sees out to an horizon 25 miles away. An antenna
on the ground there would receive its signal, but you would have to
lift it as you pushed back. By the time you pushed back another 25
miles, that receiving antenna would also have to be 1250 feet in the
air. That is only 50 miles range for a very unlikely audience. You
are challenge by an additional 50 miles, which, from your perspective,
places the top of the Empire State building beneath the earth's
surface by a considerable depth. No amount of amplification will
rescue that situation.

73's
Richard Clark, KB7QHC

Quick Rooftop Antenna For Channel 2?
 

On Sun, 07 Sep 2008 09:47:26 -0700, Richard Clark
wrote:

On Sun, 7 Sep 2008 07:25:59 -0700 (PDT), JoeSch
wrote:

I live in Connecticut, about 100 miles from New York City, (102 miles
by the lattitude-longitude charts) and I am about a block from the
water, Long Island Sound.

Hi Joe,

If you are a betting man, this frequency has a reputation for world
wide reception.... if.

It is an exotic topic, and you might astound yourself with seeing the
game, but don't invite the crew over expecting to happen. The odds
are strictly for Vegas as this exotic topic is called tropospheric
scattering, or ducting, or meteor shower DX, or any other number of
long-shot methods.

73's
Richard Clark, KB7QHC

Quick Rooftop Antenna For Channel 2?
 

Easiest and probably the cheapest is to buy a radio shack deep fringe
antenna. A chimeny or Eve mount should be the easiest, it not feasible a 20
foot piece of 1" steel pipe would do nicely. I got denver stations in
cheyenne in the 50-60s with a winegard antenna on a 20 foot pole.
Transmitters were on lookout mountain or so I was told..... Channel Master
and Wingard are two other great tv antenna manufacuters.




"JoeSch" wrote in message
...
I apologize for making this about TV reception instead of radio, but I
did not know where to turn.

I live in Connecticut, about 100 miles from New York City, (102 miles
by the lattitude-longitude charts) and I am about a block from the
water, Long Island Sound.

I grew up in New York and am a NY Jets and Giants fan, which is
broadcast from the Empire State building. The Giants' games are
carried by one network, but the other Connecticut stations only carry
Patriots games, not the Jets.

The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

Does anyone have any ideas for a quick rooftop antenna I can put on a
pole and run into my house for the Jets game? I really don't mind if
the signal is somewhat snowy as long as I can make out what is
happening on the field-beats radio. Besides, this is football-
sometimes it snows for real and nobody complains, lol.

Anyway, any help would be greatly appreciated.

PS: I have seen websites for dipole antennas. My second question
is: If I make a dipole antenna, what if I mounted it on a piece of
cardboard or styrofoam for it's length, which cardboard or styrofoam
has aluminum foil on the reverse side? The aluminum foil would not
contact the dipole, and be separated from it by one quarter to one
inch, depending on material thickness. The reason I ask is if this
will cut off 180 degrees of reception, thereby improving the signal to
noise ratio, (I know a little about electronics as an audio hobbyist,
but very little about antennas even though I have tried to get a
grasp).

Quick Rooftop Antenna For Channel 2?
 

"Frank" wrote in message
news:lNSwk.747$1x6.137@edtnps82...
The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

I thought all VHF television transmission will be discontinued as of
February 2009. Building a VHF antenna would seem to be a
wasted effort. You need to think how you can receive the
same station on UHF digital. There are plenty of UHF antennas
available; you may also need a low noise, mast-head, pre-amplifier
to get a good signal.

Regards,

Frank
WCBS, CH2 NY, will be on UHF channel 33 (digital) after 2/17/09. So, don't
waste your money on a ch 2 antenna.

Tam

Quick Rooftop Antenna For Channel 2?
 

"JoeSch" wrote in message
...
I apologize for making this about TV reception instead of radio, but I
did not know where to turn.

I live in Connecticut, about 100 miles from New York City, (102 miles
by the lattitude-longitude charts) and I am about a block from the
water, Long Island Sound.

I grew up in New York and am a NY Jets and Giants fan, which is
broadcast from the Empire State building. The Giants' games are
carried by one network, but the other Connecticut stations only carry
Patriots games, not the Jets.

The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

Does anyone have any ideas for a quick rooftop antenna I can put on a
pole and run into my house for the Jets game? I really don't mind if
the signal is somewhat snowy as long as I can make out what is
happening on the field-beats radio. Besides, this is football-
sometimes it snows for real and nobody complains, lol.

Anyway, any help would be greatly appreciated.

PS: I have seen websites for dipole antennas. My second question
is: If I make a dipole antenna, what if I mounted it on a piece of
cardboard or styrofoam for it's length, which cardboard or styrofoam
has aluminum foil on the reverse side? The aluminum foil would not
contact the dipole, and be separated from it by one quarter to one
inch, depending on material thickness. The reason I ask is if this
will cut off 180 degrees of reception, thereby improving the signal to
noise ratio, (I know a little about electronics as an audio hobbyist,
but very little about antennas even though I have tried to get a
grasp).


First of all, don't introduce any other metallic objects (foil, etc). Just
the elements described below.

You need to make a basic yagi antenna. When finished, it greatly resembles
a TV antenna, except the elements are all nearly the same size, optimized
for Channel 2. (Neglecting the fact that WCBS digital TV is on a UHF
channel. You asked for analog WCBS-TV, Channel 2.)

Fabricate a folded dipole for 57 MHz out of regular TV twinlead.
He http://www.wfu.edu/~matthews/misc/dipole.html
Looks like he uses Channel 2 as an example -- convenient! He says it's 2.5
meters long -- I think that's about 98.4 inches

Probably should mount it on an 8-foot piece of 1 X 2 wood to keep it
straight and level. An inch or so will stick out at the ends -- no big
deal. It will go on the roof, mounted crossways on another piece of wood
called a "boom" which is aligned to New York City. The folded dipole's
position on the boom should be about 2 feet from the end that will be away
from New York.

That is the active or "driven" element of the yagi and it needs some
helpers. The helpers are made of ordinary metal tubes, but have no direct
electrical connection to the driven element. Old aluminum tubing is fine.
Assorted pieces of old TV antennas will work if the pieces are tightly
fastened together and carefully cleaned at the attaching points for a good
connection.

One helper is called a "reflector" Make it 6 percent longer than the driven
element and mount it on the boom behind the driven element (away from New
York) by about 21 inches.

Next helper is called "Director #1." It's 1% shorter than the driven
element and it's mounted on the boom 21 inches in front of the driven
element, toward New York.

Next helper is called "Director #2." It's 8% shorter than the driven
element and it's mounted 37 inches in front of Director #1.

You can add more directors, same length, same spacing as #2, but they won't
capture a lot more signal after the first few. Plus, with more than two
directors, the boom gets really, really long.

Note that this antenna is a 300-ohm antenna. Since your TV input is probab
ly NOT 300 ohms, you have to transform the impedance to the 75-ohm coaxial
cable that plugs into the TV. Do that near your antenna. What I mean is
this: Have only about a foot or so of 300 ohm twinlead coming down from the
folded dipole. Connect a 300/75 ohm transformer or "balun" at that point
and run coaxial cable the rest of the way to the TV. Much better for
interference rejection, especially at Channel 2. Such 300/75 ohm baluns are
available at all radio stores as well as many variety, drug and department
stores. Buy whatever one you think you can connect with the tools at hand.
You may have a balun or two that came with an old TV or VCR.

The first one of these I ever helped build was made with coathangers on a
broomstick for Channel 13. (Higher freq meant smaller elements -- easier.)
It worked fine.

Let us know how this works for you. I'm interested to know if you were able
to follow what I wrote.

Quick Rooftop Antenna For Channel 2?
 

"JoeSch" wrote in message
...
I apologize for making this about TV reception instead of radio, but I
did not know where to turn.

I live in Connecticut, about 100 miles from New York City, (102 miles
by the lattitude-longitude charts) and I am about a block from the
water, Long Island Sound.

I grew up in New York and am a NY Jets and Giants fan, which is
broadcast from the Empire State building. The Giants' games are
carried by one network, but the other Connecticut stations only carry
Patriots games, not the Jets.

The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

Does anyone have any ideas for a quick rooftop antenna I can put on a
pole and run into my house for the Jets game? I really don't mind if
the signal is somewhat snowy as long as I can make out what is
happening on the field-beats radio. Besides, this is football-
sometimes it snows for real and nobody complains, lol.

Anyway, any help would be greatly appreciated.

PS: I have seen websites for dipole antennas. My second question
is: If I make a dipole antenna, what if I mounted it on a piece of
cardboard or styrofoam for it's length, which cardboard or styrofoam
has aluminum foil on the reverse side? The aluminum foil would not
contact the dipole, and be separated from it by one quarter to one
inch, depending on material thickness. The reason I ask is if this
will cut off 180 degrees of reception, thereby improving the signal to
noise ratio, (I know a little about electronics as an audio hobbyist,
but very little about antennas even though I have tried to get a
grasp).


First of all, don't introduce any other metallic objects (foil, etc). Just
the elements described below.

You need to make a basic yagi antenna. When finished, it greatly resembles
a TV antenna, except the elements are all nearly the same size, optimized
for Channel 2. (Neglecting the fact that WCBS digital TV is on a UHF
channel. You asked for analog WCBS-TV, Channel 2.)

Fabricate a folded dipole for 57 MHz out of regular TV twinlead.
He http://www.wfu.edu/~matthews/misc/dipole.html
Looks like he uses Channel 2 as an example -- convenient! He says it's 2.5
meters long -- I think that's about 98.4 inches

Probably should mount it on an 8-foot piece of 1 X 2 wood to keep it
straight and level. An inch or so will stick out at the ends -- no big
deal. It will go on the roof, mounted crossways on another piece of wood
called a "boom" which is aligned to New York City. The folded dipole's
position on the boom should be about 2 feet from the end that will be away
from New York.

That is the active or "driven" element of the yagi and it needs some
helpers. The helpers are made of ordinary metal tubes, but have no direct
electrical connection to the driven element. Old aluminum tubing is fine.
Assorted pieces of old TV antennas will work if the pieces are tightly
fastened together and carefully cleaned at the attaching points for a good
connection.

One helper is called a "reflector" Make it 6 percent longer than the driven
element and mount it on the boom behind the driven element (away from New
York) by about 21 inches.

Next helper is called "Director #1." It's 1% shorter than the driven
element and it's mounted on the boom 21 inches in front of the driven
element, toward New York.

Next helper is called "Director #2." It's 8% shorter than the driven
element and it's mounted 37 inches in front of Director #1.

You can add more directors, same length, same spacing as #2, but they won't
capture a lot more signal after the first few. Plus, with more than two
directors, the boom gets really, really long.

Note that this antenna is a 300-ohm antenna. Since your TV input is probab
ly NOT 300 ohms, you have to transform the impedance to the 75-ohm coaxial
cable that plugs into the TV. Do that near your antenna. What I mean is
this: Have only about a foot or so of 300 ohm twinlead coming down from the
folded dipole. Connect a 300/75 ohm transformer or "balun" at that point
and run coaxial cable the rest of the way to the TV. Much better for
interference rejection, especially at Channel 2. Such 300/75 ohm baluns are
available at all radio stores as well as many variety, drug and department
stores. Buy whatever one you think you can connect with the tools at hand.
You may have a balun or two that came with an old TV or VCR.

The first one of these I ever helped build was made with coathangers on a
broomstick for Channel 13. (Higher freq meant smaller elements -- easier.)
It worked fine.

Let us know how this works for you. I'm interested to know if you were able
to follow what I wrote.

Quick Rooftop Antenna For Channel 2?
 

In article lNSwk.747$1x6.137@edtnps82,
"Frank" wrote:

The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. Football packages on satellite TV
are beyond present financial condition. I only care about channel 2,
New York.

I thought all VHF television transmission will be discontinued as of
February 2009. Building a VHF antenna would seem to be a
wasted effort. You need to think how you can receive the
same station on UHF digital. There are plenty of UHF antennas
available; you may also need a low noise, mast-head, pre-amplifier
to get a good signal.

Regards,

Frank

hmm I thought not all the channels will necessarily change meaning
some of the vhf stations will still be there just switching from analog
to digital?

i have received some tv stations from about 100m away from
nyc in the catskill region, perhaps the natural elevation helped

but in that same area of ct i have also received ch 2 using
regular antenna however receving the ny ch wasn't the problem
the closer local ch 2 was more of an issue so pic wasn't
perfect

i used a regular but large radioshack antenna and coax

Quick Rooftop Antenna For Channel 2?
 

Thank you all for replying. Sorry to take so long to get back here.
I momentarily put the project aside because, after missing the first
game, (I posted the first message about an hour before game time,
lol), the Jets will be carried on my cable stations for the next two
weeks. Add the bye week into that and I had a couple of weeks to get
this thing together-there was no super-immediate rush. But I am going
to build this in the next week or so.

As far as Channel 2 going to UHF in February, the Jets regular season
ends in December, so an antenna that is useful until February will
take of this season nicely. Any post season playoff games by the
Jets, (should they get into the playoffs), will be broadcast
nationally, so I won't need the antenna for that. I'll worry about
next season when it happens. However, don't be surprised if next
September you see a thread about building a UHF antenna for the new
Channel 2 New York.

I have high hopes for this project giving me some kind of watchable,
albeit possibly snowy signal. Here's why. Several years ago I
dangled a piece of twin lead from my second floor window to the ground
and got both the sound and an extremely, extremely snowy picture of
Channel 4 New York, (which carried the Jets at that time). The house
I lived in was a few miles farther inland than the one I lived in now,
and it was just a simple 12 foot piece of twin lead out the window,
but I got SOMETHING. Ths project will be on a pole, on a roof, on a
house closer to the water using an antenna scientifically optimized
for Channel 2, so I think the chances of getting something watchable
are very good. There must be something more at play here than just
"line-of-sight" from here to the Empire State Building, at least at
this frequency. Besides, friends driving down to New York tell me
that they pick up FM stations on their car radios about 20 miles down
the road from here. FM frequencies are a little bit higher,
(therefore more straight line), than Channel 2. Though the
requirements for FM reception and TV reception are not the same, it
still indicates that I am not too far out of range for this
frequency.

I have found an interesting project from the US Patent Office, so it
is between that and Sal's Yagi. I am leaning toward the Yagi, so I
will be back with more questions in the next day or two. Just a few
questions:

A) What is the gain of Sal's Yagi compared to a single dipole?

B) In sound, there is a rule for Sound Pressure Level which says
"double the distance, 6 dB down in decibels". In other words, If I
have a Sound Pressure Level of 100 dB at ten feet, if I move back to
twenty feet my SPL goes down to 94 decibels. Does a similar rule
apply to antenna reception, that if get good reception with a certain
antenna from 50 miles away, I need an antenna 6 dB more sensitive to
get similar reception from 100 miles away?




On Sep 9, 10:11*am, ml wrote:
In article lNSwk.747$1x6.137@edtnps82,





*"Frank" wrote:
The Jets' games are carried on channel 2 New York, which is 102 miles
as the crow flies from my house. *Football packages on satellite TV
are beyond present financial condition. *I only care about channel 2,
New York.

I thought all VHF television transmission will be discontinued as of
February 2009. *Building a VHF antenna would seem to be a
wasted effort. *You need to think how you can receive the
same station on UHF digital. *There are plenty of UHF antennas
available; you may also need a low noise, mast-head, pre-amplifier
to get a good signal.

Regards,

Frank

hmm I thought * not all the channels will necessarily change meaning *
some of the vhf *stations will still be there just switching from analog *
to digital?

i have *received * *some * tv stations * * from *about 100m away from
nyc *in the catskill region, perhaps the natural elevation *helped

but * in that same area of *ct * i have * also received ch 2 * using
regular *antenna *however * * *receving *the ny *ch wasn't *the problem *
the * closer * local *ch 2 * was *more of *an issue * *so pic wasn't
perfect

i used *a regular *but large *radioshack antenna *and coax

Quick Rooftop Antenna For Channel 2?
 

JoeSch wrote:
Thank you all for replying. Sorry to take so long to get back here.
I momentarily put the project aside because, after missing the first
game, (I posted the first message about an hour before game time,
lol), the Jets will be carried on my cable stations for the next two
weeks. Add the bye week into that and I had a couple of weeks to get
this thing together-there was no super-immediate rush. But I am going
to build this in the next week or so.

Since this is a ham radio antenna news group, I suggest that you look up
6 meter beam antennas. The 6 meter ham band is just below the US channel
2, so they would work fine for reception.

TV signals are horizontaly polarized, so make sure to orient
your antenna appropriately.

Since you are using it for recpetion only, no complicated matching
network is needed between the antenna and the feed line. 300 Ohm twinlead,
or a simple 300 Ohm to coax transformer will do nicely.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM

Quick Rooftop Antenna For Channel 2?
 

Line of sight is the conservative and baseline propagation mode. You can
more or less rely on that when the terrain is flat. There are Mathematical
models that are somewhat predictive. Variations in elevation play a great
part and living closer to water usually means you are lower in elevation.
When there are variations in elevation, things that reflect and things that
block the signal add to the complexity and the calculations usually go out
the window. Area knowledge of the various sites and their odd coverage
areas might more resemble an inkblot test. You may find an online coverage
map for Empire State Building as it is a major radio and TV site. This
might give you an idea:
http://www.tvfool.com/

For the VHF channels, weather also plays a great part. Thermal inversions
that result in a cold/warm layer of air can act as a reflector, often
doubling the range. I routinely talk to people 100+ miles away this way in
the Summer months, but by Winter, the path is gone and can't even hear them
anymore. You may have an advantage if your path goes over the water,
otherwise it will hurt to be lower in elevation.

Quick Rooftop Antenna For Channel 2?
 

Here is a plot for WCBS-TV
http://www.tvfool.com/?option=com_wr...-TV%26type%3dA

Quick Rooftop Antenna For Channel 2?
 

"JoeSch" wrote in message
...
Thank you all for replying. Sorry to take so long to get back here.
I momentarily put the project aside because, after missing the first
game, (I posted the first message about an hour before game time,
lol), the Jets will be carried on my cable stations for the next two
weeks. Add the bye week into that and I had a couple of weeks to get
this thing together-there was no super-immediate rush. But I am going
to build this in the next week or so.

As far as Channel 2 going to UHF in February, the Jets regular season
ends in December, so an antenna that is useful until February will
take of this season nicely. Any post season playoff games by the
Jets, (should they get into the playoffs), will be broadcast
nationally, so I won't need the antenna for that. I'll worry about
next season when it happens. However, don't be surprised if next
September you see a thread about building a UHF antenna for the new
Channel 2 New York.

I have high hopes for this project giving me some kind of watchable,
albeit possibly snowy signal. Here's why. Several years ago I
dangled a piece of twin lead from my second floor window to the ground
and got both the sound and an extremely, extremely snowy picture of
Channel 4 New York, (which carried the Jets at that time). The house
I lived in was a few miles farther inland than the one I lived in now,
and it was just a simple 12 foot piece of twin lead out the window,
but I got SOMETHING. Ths project will be on a pole, on a roof, on a
house closer to the water using an antenna scientifically optimized
for Channel 2, so I think the chances of getting something watchable
are very good. There must be something more at play here than just
"line-of-sight" from here to the Empire State Building, at least at
this frequency. Besides, friends driving down to New York tell me
that they pick up FM stations on their car radios about 20 miles down
the road from here. FM frequencies are a little bit higher,
(therefore more straight line), than Channel 2. Though the
requirements for FM reception and TV reception are not the same, it
still indicates that I am not too far out of range for this
frequency.

I have found an interesting project from the US Patent Office, so it
is between that and Sal's Yagi. I am leaning toward the Yagi, so I
will be back with more questions in the next day or two. Just a few
questions:

A) What is the gain of Sal's Yagi compared to a single dipole?

SAL ADDS: YOU'LL GET GAIN OF SIX TO EIGHT DB (NOT SHOUTING. USING CAPS
TO OFFSET, SINCE THE STUPID PROGRAM DIDN'T MAKE THE RIGHT MARKS.)

B) In sound, there is a rule for Sound Pressure Level which says
"double the distance, 6 dB down in decibels". In other words, If I
have a Sound Pressure Level of 100 dB at ten feet, if I move back to
twenty feet my SPL goes down to 94 decibels. Does a similar rule
apply to antenna reception, that if get good reception with a certain
antenna from 50 miles away, I need an antenna 6 dB more sensitive to
get similar reception from 100 miles away?

IT'S WORSE THAN THAT, UNFORTUNATELY, SINCE THE SIGNAL DOESN'T BEND MUCH
AROUND THE EARTH'S CURVATURE. IT WOULD BE TRUE FOR DISTANCES OF 5 AND 10
MILES, RESPECTIVELY, SINCE THE EARTH'S CURVATURE DOESN'T COME INTO PLAY AT
THOSE DISTANCES. (YOUR SOURCE IS ABOUT 1200 FT UP IN THE AIR.)

A PHENOMENON CALLED "DUCTING" WILL SOMETIMES TRUMP THE EARTH'S CURVATURE.
TV SIGNALS CAN GET TRAPPED IN ATMOSPHERIC LAYERS AND BE RETURNED TO EARTH
MUCH STRONGER THAN THE THEORY PREDICTS. DUCTS ARE MORE COMMON IN WARM AIR,
SO FOOTBALL SEASON IN THE NORTHEAST IS NOT THE TIME TO BE HOPING FOR
DUCTING.

FOR WHAT IT'S WORTH, WCBS-2 IS ALREADY SENDING OUT ITS DIGITAL SIGNAL IN
ADVANCE OF NEXT FEBRUARY -- MOST STATIONS ARE DOING SO. WCBS IS ON CHANNEL
56 NOW AND WILL DROP TO 33 ON TRANSITION DAY. SEE
http://rabbitears.info/market.php

IT IS CONCEIVABLE THAT A BIG UHF ANTENNA WOULD WORK FOR YOU. IT WORKS FOR
ME, HERE IN SOUTHERN CALIFORNIA, BUT MY DISTANT TRANSMITTERS ARE ON A 6,000
FT MOUNTAINTOP, WHICH IS A SIGNIFICANT ADVANTAGE FOR ME.

"SAL"

Quick Rooftop Antenna For Channel 2?
 

dittos

"Sal M. Onella" wrote in message
...

"JoeSch" wrote in message
...
Thank you all for replying. Sorry to take so long to get back here.
I momentarily put the project aside because, after missing the first
game, (I posted the first message about an hour before game time,
lol), the Jets will be carried on my cable stations for the next two
weeks. Add the bye week into that and I had a couple of weeks to get
this thing together-there was no super-immediate rush. But I am going
to build this in the next week or so.

As far as Channel 2 going to UHF in February, the Jets regular season
ends in December, so an antenna that is useful until February will
take of this season nicely. Any post season playoff games by the
Jets, (should they get into the playoffs), will be broadcast
nationally, so I won't need the antenna for that. I'll worry about
next season when it happens. However, don't be surprised if next
September you see a thread about building a UHF antenna for the new
Channel 2 New York.

I have high hopes for this project giving me some kind of watchable,
albeit possibly snowy signal. Here's why. Several years ago I
dangled a piece of twin lead from my second floor window to the ground
and got both the sound and an extremely, extremely snowy picture of
Channel 4 New York, (which carried the Jets at that time). The house
I lived in was a few miles farther inland than the one I lived in now,
and it was just a simple 12 foot piece of twin lead out the window,
but I got SOMETHING. Ths project will be on a pole, on a roof, on a
house closer to the water using an antenna scientifically optimized
for Channel 2, so I think the chances of getting something watchable
are very good. There must be something more at play here than just
"line-of-sight" from here to the Empire State Building, at least at
this frequency. Besides, friends driving down to New York tell me
that they pick up FM stations on their car radios about 20 miles down
the road from here. FM frequencies are a little bit higher,
(therefore more straight line), than Channel 2. Though the
requirements for FM reception and TV reception are not the same, it
still indicates that I am not too far out of range for this
frequency.

I have found an interesting project from the US Patent Office, so it
is between that and Sal's Yagi. I am leaning toward the Yagi, so I
will be back with more questions in the next day or two. Just a few
questions:

A) What is the gain of Sal's Yagi compared to a single dipole?

SAL ADDS: YOU'LL GET GAIN OF SIX TO EIGHT DB (NOT SHOUTING. USING CAPS
TO OFFSET, SINCE THE STUPID PROGRAM DIDN'T MAKE THE RIGHT MARKS.)

B) In sound, there is a rule for Sound Pressure Level which says
"double the distance, 6 dB down in decibels". In other words, If I
have a Sound Pressure Level of 100 dB at ten feet, if I move back to
twenty feet my SPL goes down to 94 decibels. Does a similar rule
apply to antenna reception, that if get good reception with a certain
antenna from 50 miles away, I need an antenna 6 dB more sensitive to
get similar reception from 100 miles away?

IT'S WORSE THAN THAT, UNFORTUNATELY, SINCE THE SIGNAL DOESN'T BEND MUCH
AROUND THE EARTH'S CURVATURE. IT WOULD BE TRUE FOR DISTANCES OF 5 AND 10
MILES, RESPECTIVELY, SINCE THE EARTH'S CURVATURE DOESN'T COME INTO PLAY AT
THOSE DISTANCES. (YOUR SOURCE IS ABOUT 1200 FT UP IN THE AIR.)

A PHENOMENON CALLED "DUCTING" WILL SOMETIMES TRUMP THE EARTH'S CURVATURE.
TV SIGNALS CAN GET TRAPPED IN ATMOSPHERIC LAYERS AND BE RETURNED TO EARTH
MUCH STRONGER THAN THE THEORY PREDICTS. DUCTS ARE MORE COMMON IN WARM
AIR,
SO FOOTBALL SEASON IN THE NORTHEAST IS NOT THE TIME TO BE HOPING FOR
DUCTING.

FOR WHAT IT'S WORTH, WCBS-2 IS ALREADY SENDING OUT ITS DIGITAL SIGNAL IN
ADVANCE OF NEXT FEBRUARY -- MOST STATIONS ARE DOING SO. WCBS IS ON
CHANNEL
56 NOW AND WILL DROP TO 33 ON TRANSITION DAY. SEE
http://rabbitears.info/market.php

IT IS CONCEIVABLE THAT A BIG UHF ANTENNA WOULD WORK FOR YOU. IT WORKS FOR
ME, HERE IN SOUTHERN CALIFORNIA, BUT MY DISTANT TRANSMITTERS ARE ON A
6,000
FT MOUNTAINTOP, WHICH IS A SIGNIFICANT ADVANTAGE FOR ME.

"SAL"

Quick Rooftop Antenna For Channel 2?
 

"JB" wrote in message
news:nMRzk.252$Yw1.138@trnddc03...
Here is a plot for WCBS-TV
http://www.tvfool.com/?option=com_wr...CBS-TV%26type%
3dA



Be optimistic. That plot is conservative and here's why:

I grew up on Long Island and we often got Philly stations on a simple attic
antenna. However, the plots for Philly stations do not show that can
happen.

"Sal"

Quick Rooftop Antenna For Channel 2?
 

On Tue, 16 Sep 2008 18:21:22 -0700, "Sal M. Onella"
wrote:

MY DISTANT TRANSMITTERS ARE ON A 6,000
FT MOUNTAINTOP, WHICH IS A SIGNIFICANT ADVANTAGE FOR ME.

Hi Joe,

The impact of this statement is that with the transmitter antenna that
high, it can see to an horizon (edge of the viewable earth) that is
109 miles away. This is just the situation you need if your receive
antenna was sitting on the ground. Unfortunately, the Empire State
Building is not that tall (1200 feet or so), and it is effectively
(from your point of view, literally) underground by that needed
additional 4800 feet.

To make up the difference, you would lift that antenna off the ground,
and try to raise it that same 4800 feet. Unlikely. A gain antenna
will not make up for looking through 100 miles of mud and water.

On the flip side, if ducting is working (don't make a schedule based
on this coinciding with your calendar), rabbit ears on your roof will
do nicely. Myself, during the summer months in Colorado, I could get
Edmonton and Calgary Canada - more than 1000 miles away. Getting
them on separate occasions was more a surprise than a plan, however.
But I did manage to get to see an entire movie before the duct
collapsed.

A simple question that hasn't been addressed:
What do you see when you tune NYC stations?

73's
Richard Clark, KB7QHC

Quick Rooftop Antenna For Channel 2?
 

"Sal M. Onella" wrote in message
...

"JoeSch" wrote in message
...

snip

Does anyone have any ideas for a quick rooftop antenna I can put on a
pole and run into my house for the Jets game? I really don't mind if
the signal is somewhat snowy as long as I can make out what is
happening on the field-beats radio. Besides, this is football-
sometimes it snows for real and nobody complains, lol.

snip

You need to make a basic yagi antenna. When finished, it greatly
resembles
a TV antenna, except the elements are all nearly the same size, optimized
for Channel 2. (


snip

I posted the instructions for a Channel 2 Yagi a few weeks ago. They were
acknowledged and I've been waiting anxiously for some feedback.

Curiosity got the better of me this afternoon, so I built the thing
myself -- exactly as described except for the second director, since I was
losing the light and three elements proved the point.

With just the folded dipole at ten feet, I got a recognizable KCBS picture
from 124 miles. Bad snow, noisy sound and no color. Joe, a dedicated Jets
fan, would watch this picture but his girl friend would not.

When I added the reflector, the snow and the sound got better. When I put
it up to fifteen feet I had color. When I added the first director and
returned it to fifteen feet, the snow got a lot less and the picture was
quite watchable. The girl friend would say, "Gee, Honey, that's a pretty
good picture. Can we get free HBO, too?" (They never understand ...
never.)

I measured the signal with my old analog signal level meter and got negative
16 dBmV, which looked about right. Another director should add only a dB or
two. Maybe I will try a preamp and see what that does. Trouble is, Channel
2 suffers from impulse noise (electrical appliances are usually the cause).
Antenna would need to be elevated to reduce that problem.

WCBS has an insignificant 1 dB more power than KCBS but their antenna height
is a lot less, which impacts Joe in Connecticut. However, his distance is
less, 100 miles vs. 124 miles.

"Sal"

Quick Rooftop Antenna For Channel 2?
 

"Sal M. Onella" wrote in message
...

"Sal M. Onella" wrote in message
...

"JoeSch" wrote in message
...

snip

Does anyone have any ideas for a quick rooftop antenna I can put on a
pole and run into my house for the Jets game? I really don't mind if
the signal is somewhat snowy as long as I can make out what is
happening on the field-beats radio. Besides, this is football-
sometimes it snows for real and nobody complains, lol.

snip

You need to make a basic yagi antenna. When finished, it greatly
resembles
a TV antenna, except the elements are all nearly the same size, optimized
for Channel 2. (


snip

I posted the instructions for a Channel 2 Yagi a few weeks ago. They were
acknowledged and I've been waiting anxiously for some feedback.

Curiosity got the better of me this afternoon, so I built the thing
myself -- exactly as described except for the second director, since I was
losing the light and three elements proved the point.

With just the folded dipole at ten feet, I got a recognizable KCBS picture
from 124 miles. Bad snow, noisy sound and no color. Joe, a dedicated
Jets
fan, would watch this picture but his girl friend would not.

When I added the reflector, the snow and the sound got better. When I put
it up to fifteen feet I had color. When I added the first director and
returned it to fifteen feet, the snow got a lot less and the picture was
quite watchable. The girl friend would say, "Gee, Honey, that's a pretty
good picture. Can we get free HBO, too?" (They never understand ...
never.)

I measured the signal with my old analog signal level meter and got
negative
16 dBmV, which looked about right. Another director should add only a dB
or
two. Maybe I will try a preamp and see what that does. Trouble is,
Channel
2 suffers from impulse noise (electrical appliances are usually the
cause).
Antenna would need to be elevated to reduce that problem.

WCBS has an insignificant 1 dB more power than KCBS but their antenna
height
is a lot less, which impacts Joe in Connecticut. However, his distance is
less, 100 miles vs. 124 miles.

"Sal"

A 3el 6m yagi would work very well, all you need is a 50 ohm to 75 ohm
adapter @ about 20 feet. Use a small TV rotator, and when your not watching
ch2 you can try calling CQ on 6m.

Quick Rooftop Antenna For Channel 2?
 

"W3CQH" wrote in message

snip

A 3el 6m yagi would work very well, all you need is a 50 ohm to 75 ohm
adapter @ about 20 feet. Use a small TV rotator, and when your not
watching
ch2 you can try calling CQ on 6m.


This experiment will probably turn into a 6m Yagi, anyway, since we won't
have an analog Channel 2 after DTV takes over in February.

I'll need to check the polarization for 6m. Right now I have a couple of
j-poles for 6m, vertically polarized. Thanks.

Quick Rooftop Antenna For Channel 2?
 

"Sal M. Onella" wrote in message
...

"W3CQH" wrote in message

snip

A 3el 6m yagi would work very well, all you need is a 50 ohm to 75 ohm
adapter @ about 20 feet. Use a small TV rotator, and when your not
watching
ch2 you can try calling CQ on 6m.


This experiment will probably turn into a 6m Yagi, anyway, since we won't
have an analog Channel 2 after DTV takes over in February.

I'll need to check the polarization for 6m. Right now I have a couple of
j-poles for 6m, vertically polarized. Thanks.

AM - SSB - CW - (digital) = Horizontal, FM = Vertical

Quick Rooftop Antenna For Channel 2?
 

"W3CQH" wrote in message
AM - SSB - CW - (digital) = Horizontal, FM = Vertical



My lone 6m rig is FM-only, so vertical is the way to go. Thanks.

Quick Rooftop Antenna For Channel 2?
 

"Sal M. Onella" wrote in message
news:Q5YEk.4884

snip

I posted the instructions for a Channel 2 Yagi a few weeks ago. They were
acknowledged and I've been waiting anxiously for some feedback.

Curiosity got the better of me this afternoon, so I built the thing
myself -- exactly as described except for the second director, since I was
losing the light and three elements proved the point.

snip

... the picture was quite watchable.

Today, I added the second director and the signal level actually went DOWN a
dB or two. I couldn't believe it, so I took the second director off and
the signal came back up.

Maybe the extra director is throwing off the impedance, and making any
additional gain disappear. The folded dipole is terminated in a 300/75 TV
balun and these are not precision instruments!

I noted that the MFG-259 analyzer did not show one distinct dip in the SWR.
There were dips all over the place. I realize that the -259 is 50 ohms and
I was reading into a 75 ohm system but I don't think that would greatly
affect the dips, other than how close to 1:1 I'd see.