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John Plimmer October 7th 06 10:40 PM

Best MW radio and antenna
 
My DX pal, Gary Deacon has just caught KSL Salt Lake City on 1160 khz using
his ancient (unmodified) rusted and salt encrusted Yaesu FRG-7 and his
ALA1530 which sits hanging unmounted on his cupboard door. Salt Lake City is
9,700 miles from his suburban home in Fishoek, a small coastal resort near
the main city of Cape Town. The catches he gets from home attests to the
remarkable "sea gain" experienced on the MW band when you DX from the beach
(or near it).

He did get a better catch than that at our September equinox DXpedition when
he caught CASH in Tecate Mexico, right next door to San Diego CA. That was
at the Seefontein DX cottage right on the beach of the Atlantic ocean, also
using his Frog but then with a 1,300 foot beverage antenna over the shoulder
to New York.

Motto of the story is that you don't have to have the world's latest whizz
bang radio to get those amazing DX catches, but as Conrad Hilton said, it's
all about position, position position!

More info on Gary's activities at Fishoek and our Seefontein DX site can be
found at
http://www.dxing.info

--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop, POARDT Roelof mini-whip
http://www.dxing.info/about/dxers/plimmer.dx



[email protected] October 8th 06 02:31 AM

Best MW radio and antenna
 
Mr.Plimmer,see if y'all can pick up some Mississippi Radio
Stations.y'all know how to do a www.devilfinder.com or
www.dogpile.com or www.vivisimo.com search thingy for them.See
if y'all can pick up (Mondays through Friday mornings) Paul Gallo's
radio talk show (6:00 AM to 9:00 AM) and the JT and Dave radio talk
show.(10:00 AM to 1:00 PM.Central Standard Time Zone in U.S.A.) If y'all
can't pick them up on y'alls radios,I think you can with your computers.
cuhulin


[email protected] October 8th 06 02:34 AM

Best MW radio and antenna
 
Paris Hilton got caught drunk driving. www.drsputnik.com
It probally won't be her last time either.
cuhulin


Greg October 8th 06 03:40 AM

Best MW radio and antenna
 
In article ,
"John Plimmer" wrote:

My DX pal, Gary Deacon has just caught KSL Salt Lake City on 1160 khz using
his ancient (unmodified) rusted and salt encrusted Yaesu FRG-7 and his
ALA1530 which sits hanging unmounted on his cupboard door. Salt Lake City is
9,700 miles from his suburban home in Fishoek, a small coastal resort near
the main city of Cape Town. The catches he gets from home attests to the
remarkable "sea gain" experienced on the MW band when you DX from the beach
(or near it).

He did get a better catch than that at our September equinox DXpedition when
he caught CASH in Tecate Mexico, right next door to San Diego CA. That was
at the Seefontein DX cottage right on the beach of the Atlantic ocean, also
using his Frog but then with a 1,300 foot beverage antenna over the shoulder
to New York.

Motto of the story is that you don't have to have the world's latest whizz
bang radio to get those amazing DX catches, but as Conrad Hilton said, it's
all about position, position position!

More info on Gary's activities at Fishoek and our Seefontein DX site can be
found at
http://www.dxing.info


"Sea gain"? Sounds interesting - please explain. Once while
vacationing on the shore of the Gulf of Mexico, Anna Maria Island,
Florida, I was pulling in all kinds of DX at night on the 20 meter ham
band on my Radio Shack DX-440 portable - much more than I ever did at
home (inland).

Greg

[email protected] October 8th 06 04:57 AM

Best MW radio and antenna
 
My explanation of Sea gain.(keep in mind,I am always right) OK,if you
live on the East Coast of U.S.A.There isn't a lot of crap to prevent
your radio from picking up Europe at night time.When I was toolin down
the A1A in Florida one night,I picked up an Irish AM radio station on my
van's radio in Ireland.
cuhulin


m II October 8th 06 05:04 AM

Best MW radio and antenna
 
wrote:

My explanation of Sea gain.(keep in mind,I am always right) OK,if you
live on the East Coast of U.S.A.There isn't a lot of crap to prevent
your radio from picking up Europe at night time.When I was toolin down
the A1A in Florida one night,I picked up an Irish AM radio station on my
van's radio in Ireland.
cuhulin



How could you hear the radio if it was in Ireland?



mike

[email protected] October 8th 06 05:31 AM

Best MW radio and antenna
 
It was night time and the Irish Radio Station knew I had to hear those
Uilleann Pipes playing.

Is everybody in Canada just like you? Pray for their souls.
cuhulin


John Plimmer October 8th 06 05:57 AM

Best MW radio and antenna
 
SEA GAIN is indeed a very interesting phenomena. A group of MW DXer's
throughout the world have been researching this and confirmed the very
beneficial results obtained when DXing by or near the sea. A couple of the
fella's unearthed research done by the BBC over forty years ago when they
were researching the best siting of MW transmitters. This was the definitive
paper that confirmed the existence of "sea gain" on the MW band.

I did a sea gain experiment with my Drake SW8 at Veldrif in 2005. Using a
reference station of France Info, Nice on 1557 I travelled inland from the
beach. By the time I got 10km's/6 miles inland the signal had dropped off
minus -23dB!

I can confirm after 40 years of DXing in various sites that DXing by the sea
is spectacularly better than the best inland location.
Most of your top American DXer's head for the coast during the DX season and
get amazing catches not possible inland.

--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop, POARDT Roelof mini-whip
http://www.dxing.info/about/dxers/plimmer.dx

"Greg" wrote in message
...
"Sea gain"? Sounds interesting - please explain. Once while
vacationing on the shore of the Gulf of Mexico, Anna Maria Island,
Florida, I was pulling in all kinds of DX at night on the 20 meter ham
band on my Radio Shack DX-440 portable - much more than I ever did at
home (inland).

Greg




Doug Smith W9WI October 8th 06 02:55 PM

Best MW radio and antenna
 
Greg wrote:
"Sea gain"? Sounds interesting - please explain. Once while
vacationing on the shore of the Gulf of Mexico, Anna Maria Island,
Florida, I was pulling in all kinds of DX at night on the 20 meter ham
band on my Radio Shack DX-440 portable - much more than I ever did at
home (inland).


The effect is far more dramatic on the MW band!

MW propagation is greatly affected by ground conductivity. FCC
regulation 73.190 (figure R3) is a chart of ground conductivity for the
United States. In New England and the NYC area where MW propagation is
notoriously poor, it ranges from 0.5 to 2mmho/m. Here in the South
where it isn't much better, figures run between 2 and 8. (that includes
Florida) In North Dakota where a single 5kw station can cover the
whole state, figures between 15 and 30 are common.

The chart considers the "ground" conductivity of seawater to be
5000mmho/m. (yes, that's 200 times better than the best land)

Two examples of direct observation:

- Wilmington, NC, at night. Car radio in the beach parking lot: Jamaica
blasting in at entertainment quality on 760 and several other
frequencies. I start driving inland; within a block the signals are
noticably weaker. Within a mile, they're barely audible. When I get
back to my motel about five miles inland, Jamaica is totally gone.

- Massachusetts, high noon, car radio about five miles inland west of
Newburyport. CHTN-720, Prince Edward Island, local quality. Drive
about 20 miles inland to Andover; CHTN gradually fades into nothingness.

Interesting that you observed this on 20m. Maybe less local
interference? The ground conductivity shouldn't have much effect on
shortwave -- greater *distances* (i.e., being within maybe 200 miles of
the Atlantic in Florida, rather than being within 900 miles here in
Tennessee) should make a big difference but I wouldn't think the
difference between Tampa and a Gulf island would be that dramatic.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com


dxAce October 8th 06 03:03 PM

Best MW radio and antenna
 


John Plimmer wrote:

SEA GAIN is indeed a very interesting phenomena. A group of MW DXer's
throughout the world have been researching this and confirmed the very
beneficial results obtained when DXing by or near the sea. A couple of the
fella's unearthed research done by the BBC over forty years ago when they
were researching the best siting of MW transmitters. This was the definitive
paper that confirmed the existence of "sea gain" on the MW band.

I did a sea gain experiment with my Drake SW8 at Veldrif in 2005. Using a
reference station of France Info, Nice on 1557 I travelled inland from the
beach. By the time I got 10km's/6 miles inland the signal had dropped off
minus -23dB!

I can confirm after 40 years of DXing in various sites that DXing by the sea
is spectacularly better than the best inland location.
Most of your top American DXer's head for the coast during the DX season and
get amazing catches not possible inland.


It would seem as though some of the "top American DX'ers" are even resorting
these days to travelling to or near their wanted DX target, hearing said target,
and then actually counting that in their totals. Some are even resorting to
using some of the various "DX-tuners" throughout the world and "hearing" their
target via computer.

A travesty.

dxAce
Michigan
USA



[email protected] October 8th 06 06:20 PM

Best MW radio and antenna
 
I am only about two hundred something miles from Pensacola,florida.That
married Irish woman calls Pensacola,,, Peniscola.
cuhulin


Telamon October 8th 06 07:34 PM

Best MW radio and antenna
 
In article ,
dxAce wrote:

John Plimmer wrote:

SEA GAIN is indeed a very interesting phenomena. A group of MW
DXer's throughout the world have been researching this and
confirmed the very beneficial results obtained when DXing by or
near the sea. A couple of the fella's unearthed research done by
the BBC over forty years ago when they were researching the best
siting of MW transmitters. This was the definitive paper that
confirmed the existence of "sea gain" on the MW band.

I did a sea gain experiment with my Drake SW8 at Veldrif in 2005.
Using a reference station of France Info, Nice on 1557 I travelled
inland from the beach. By the time I got 10km's/6 miles inland the
signal had dropped off minus -23dB!

I can confirm after 40 years of DXing in various sites that DXing
by the sea is spectacularly better than the best inland location.
Most of your top American DXer's head for the coast during the DX
season and get amazing catches not possible inland.


It would seem as though some of the "top American DX'ers" are even
resorting these days to travelling to or near their wanted DX target,
hearing said target, and then actually counting that in their totals.
Some are even resorting to using some of the various "DX-tuners"
throughout the world and "hearing" their target via computer.

A travesty.


Yeah, nether would count as DXing. What are these people thinking?

--
Telamon
Ventura, California

FiNOH October 8th 06 08:04 PM

Best MW radio and antenna
 

Where does the magnet in a speaker get its power from? Why doesn't it
run out?


Thanks
FINOH #29718
Finoh #28437
FiNOH #27447
I love spacefed.


On Oct 7, 4:40 pm, "John Plimmer" wrote:
My DX pal, Gary Deacon has just caught KSL Salt Lake City on 1160 khz using
his ancient (unmodified) rusted and salt encrusted Yaesu FRG-7 and his
ALA1530 which sits hanging unmounted on his cupboard door. Salt Lake City is
9,700 miles from his suburban home in Fishoek, a small coastal resort near
the main city of Cape Town. The catches he gets from home attests to the
remarkable "sea gain" experienced on the MW band when you DX from the beach
(or near it).

He did get a better catch than that at our September equinox DXpedition when
he caught CASH in Tecate Mexico, right next door to San Diego CA. That was
at the Seefontein DX cottage right on the beach of the Atlantic ocean, also
using his Frog but then with a 1,300 foot beverage antenna over the shoulder
to New York.

Motto of the story is that you don't have to have the world's latest whizz
bang radio to get those amazing DX catches, but as Conrad Hilton said, it's
all about position, position position!

More info on Gary's activities at Fishoek and our Seefontein DX site can be
found athttp://www.dxing.info

--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop, POARDT Roelof mini-whiphttp://www.dxing.info/about/dxers/plimmer.dx



[email protected] October 8th 06 10:20 PM

Best MW radio and antenna
 
Whatever I say is best is best.Maryknoll,Ireland was ''talkin'' at me on
the A1A.
cuhulin
.................................................. ...
y'all can't talk to them Pipes,standing up!
cuhulin


[email protected] October 8th 06 10:36 PM

Best MW radio and antenna
 
Tak O'cup O'Kindbess yet,,,,
Speakin of off shore dudes.Back in the 1970's,there was an off shorer
dude in N'Awlins.He had a MG TF car for sale.We went ridin (I didn't buy
the car) every word he said,he was shoutin at the top of his lungs.
cuhulin
www.devilfinder.com Robokopp Sweetly She Sleeps


Mark October 8th 06 11:07 PM

Best MW radio and antenna
 
John,

Yes, know what you mean. I've just spent two weeks in Fiji. I took a Sony
ICF-SW55 portable and 20 feet of wire which I put up inside a bungalow. The
little bungalow was about 10 metres from the water's edge.

I've done this before several times. It is incredible what you can hear.
Mainly, because of what you CAN'T hear - namely all the electrical static
and noise pollution of living in a city! It's like an astronomer escaping to
the desert with a telescope - seems like there's many more stars than usual.

On a clear day, you can hear for ever! And sometimes the signals you get are
very weak. But also very audible because there is simply NO noise.

Under conditions like these, a simple portable radio and piece of wire will
out-perform many a city-based high-end receiver setup.

Mark.
Auckland
New Zealand.



[email protected] October 8th 06 11:12 PM

Best MW radio and antenna
 
Hey!,,, Immitation of Life movie has just now cranked up on tv.Bite Me!
cuhulin


justice October 9th 06 03:04 AM

Best MW radio and antenna
 

John Plimmer wrote:
SEA GAIN is indeed a very interesting phenomena. A group of MW DXer's
throughout the world have been researching this and confirmed the very
beneficial results obtained when DXing by or near the sea. A couple of the
fella's unearthed research done by the BBC over forty years ago when they
were researching the best siting of MW transmitters. This was the definitive
paper that confirmed the existence of "sea gain" on the MW band.

I did a sea gain experiment with my Drake SW8 at Veldrif in 2005. Using a
reference station of France Info, Nice on 1557 I travelled inland from the
beach. By the time I got 10km's/6 miles inland the signal had dropped off
minus -23dB!

I can confirm after 40 years of DXing in various sites that DXing by the sea
is spectacularly better than the best inland location.
Most of your top American DXer's head for the coast during the DX season and
get amazing catches not possible inland.

--


John, may I ask a possibly stupid question? Does it make a difference
as to which direction the signals are coming from in relation to where
you are on the coast? For example, I live on the Gulf Coast side of
Florida, so European signals would have to come over the peninsula of
Florida to reach my antenna. Would being located on the other side of
Florida, say near Miami, be better for European signals, where there
would be nothing but ocean between my antenna and the radio station, or
is it an omnidirectional effect?


[email protected] October 9th 06 03:10 AM

Best MW radio and antenna
 
No matter where you are in Florida,you are less than two hours away from
a beach.Unless you are walking.
cuhulin


John Plimmer October 9th 06 04:46 AM

Best MW radio and antenna
 
Well said Mark - you fella's have really got to get those radio's down to
the seaside.
The results will exceed all your expectations!
--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop, POARDT Roelof mini-whip
http://www.dxing.info/about/dxers/plimmer.dx

"Mark" wrote in message
news:1160345036.733922@ftpsrv1...
John,

Yes, know what you mean. I've just spent two weeks in Fiji. I took a Sony
ICF-SW55 portable and 20 feet of wire which I put up inside a bungalow.
The
little bungalow was about 10 metres from the water's edge.

I've done this before several times. It is incredible what you can hear.
Mainly, because of what you CAN'T hear - namely all the electrical static
and noise pollution of living in a city! It's like an astronomer escaping
to
the desert with a telescope - seems like there's many more stars than
usual.

On a clear day, you can hear for ever! And sometimes the signals you get
are
very weak. But also very audible because there is simply NO noise.

Under conditions like these, a simple portable radio and piece of wire
will
out-perform many a city-based high-end receiver setup.

Mark.
Auckland
New Zealand.





John Plimmer October 9th 06 05:06 AM

Best MW radio and antenna
 
Not a stupid question at all Justice - the results I quoted of doing the
test on France Info from Nice indicates that the sea gain effect is indeed
omnidirectional, as the path of France to the DX test site at Veldrif is
over the African continent.

So if you are trying to get a distant local station inland, you will
experience a great gain on MW by going to the seaside.
Having said that though, obviously the gain over the sea will always be
superior to the land, but an amazing improvement is also possible over land
as well.

At our Jongensgat DXpedition site we have a clear path to the East over the
Indian ocean to Australia and the Far East, so signals from that area are
really good. But we also get amazingly good reception of the U.S. which has
a path of two hundred miles overland and mountains before it reaches the
Atlantic ocean.

The best U.S. catch I ever got was KGA, Spokane from Jongensgat. That is
10,000 miles away and 200 miles of it is over the Southern African
continent.

Have fun and enjoy some DXing from the seaside.
--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop, POARDT Roelof mini-whip
http://www.dxing.info/about/dxers/plimmer.dx

"justice" wrote in message
oups.com...

John, may I ask a possibly stupid question? Does it make a difference
as to which direction the signals are coming from in relation to where
you are on the coast? For example, I live on the Gulf Coast side of
Florida, so European signals would have to come over the peninsula of
Florida to reach my antenna. Would being located on the other side of
Florida, say near Miami, be better for European signals, where there
would be nothing but ocean between my antenna and the radio station, or
is it an omnidirectional effect?




m II October 9th 06 07:22 AM

Best MW radio and antenna
 
wrote:

It was night time and the Irish Radio Station knew I had to hear those
Uilleann Pipes playing.

Is everybody in Canada just like you? Pray for their souls.





YOU said the van's radio was in Ireland. How could you possibly hear it
all the over in Florida? Re read your posting:


=======================
When I was toolin down
the A1A in Florida one night,I picked up an Irish AM radio station on my
van's radio in Ireland.
=======================

Care to explain how your van's radio got to Ireland? Didn't you see it
missing? Perhaps you mailed it there in a drunken stupor....


mike

k35454 October 9th 06 08:20 AM

Best MW radio and antenna
 

"m II" wrote in message news:OUlWg.7543$H7.5506@edtnps82...
wrote:

It was night time and the Irish Radio Station knew I had to hear those
Uilleann Pipes playing.

Is everybody in Canada just like you? Pray for their souls.





YOU said the van's radio was in Ireland. How could you possibly hear it
all the over in Florida? Re read your posting:


=======================
When I was toolin down
the A1A in Florida one night,I picked up an Irish AM radio station on my
van's radio in Ireland.
=======================

Care to explain how your van's radio got to Ireland? Didn't you see it
missing? Perhaps you mailed it there in a drunken stupor....


mike

"mailed it"... by Eire mail ??
BWAHAAAAAAAAAAAAAAAAAAHAHAHaha.
k35454. (yes, I
know I'm brilliant ).



m II October 9th 06 03:40 PM

Best MW radio and antenna
 
k35454 wrote:
"m II" wrote in message news:OUlWg.7543$H7.5506@edtnps82...
wrote:

It was night time and the Irish Radio Station knew I had to hear those
Uilleann Pipes playing.

Is everybody in Canada just like you? Pray for their souls.





YOU said the van's radio was in Ireland. How could you possibly hear it
all the over in Florida? Re read your posting:


=======================
When I was toolin down
the A1A in Florida one night,I picked up an Irish AM radio station on my
van's radio in Ireland.
=======================

Care to explain how your van's radio got to Ireland? Didn't you see it
missing? Perhaps you mailed it there in a drunken stupor....


mike

"mailed it"... by Eire mail ??
BWAHAAAAAAAAAAAAAAAAAAHAHAHaha.
k35454. (yes, I
know I'm brilliant ).



ummmm....yes....brilliant...cough cough...

the radio must have been flying as high as cuhulin on a Friday night. I
understand the dog hides every time he hears the whiskey bottle open.
Needless to say, the poor thing spends a lot of time under the couch.
That is why it's called Blueberry's couch.




mike

[email protected] October 9th 06 03:55 PM

Best MW radio and antenna
 
Frogland used to be part of Limeyland,lonnnng ago.A big Ocean wash wiped
out that piece of territory that used to connect Frogland to
Limeyland.Look at the White Cliffs of Dover.
cuhulin


[email protected] October 9th 06 04:03 PM

Best MW radio and antenna
 
My van's Radio is in the dashboard of my van.My van and I were toolin
down the A1A in Florida,by the Atlantic Ocean.
Don't try your Canadian mealy mouth yap crap putting words in my
mouth.YOU WILL LOSE Every Time.
cuhulin


[email protected] October 9th 06 04:10 PM

Best MW radio and antenna
 
Maryknoll is in Ireland.I was picking up a Radio Station in
Maryknoll,Ireland.My van and my van's Radio were in Florida.
I own a half acre of land in Interlachen,Florida,Putnam County.Come on
now,Canadian,tell me Interlachen is in Switzerland.Let's see what you
don't know.
cuhulin


[email protected] October 9th 06 04:12 PM

Best MW radio and antenna
 
Yeah,my van's Radio glomped out of the dashboard and it sprouted wangs
and went to Ireland.
cuhulin


[email protected] October 9th 06 04:17 PM

Best MW radio and antenna
 
Heart failuer!!!!! and their little bellys stuck out like a pigs
bladder!!!!!! Grapes of Wrath.
cuhulin


Slow Code October 10th 06 02:08 AM

Best MW radio and antenna
 
wrote in
:

My van's Radio is in the dashboard of my van.My van and I were toolin
down the A1A in Florida,by the Atlantic Ocean.
Don't try your Canadian mealy mouth yap crap putting words in my
mouth.YOU WILL LOSE Every Time.
cuhulin


Cuhu

Don't worry about anything them dumb ass liberals north of the border like
to hee haw about. They don't understand things like propagation. They're
more likely right at home talking and listening to a fence post.

SC

Brian Hill October 10th 06 05:32 PM

Best MW radio and antenna
 

"dxAce" wrote in message

It would seem as though some of the "top American DX'ers" are even
resorting
these days to travelling to or near their wanted DX target, hearing said
target,
and then actually counting that in their totals. Some are even resorting
to
using some of the various "DX-tuners" throughout the world and "hearing"
their
target via computer.

A travesty.

dxAce
Michigan
USA



Yes it has been going on for some time. Real DXers my ass. Some of the
published claims I've read over the years seem just a little fishy
considering their QTH and propagation conditions at the time.


--

Regards
B.H.
Southern, MN USA
Radios- R-5000, NRD525,SP-600,SX-28,Eton E1

Brian's Radio Universe
http://webpages.charter.net/brianhill/500.htm

Brian's Basement
http://webpages.charter.net/brianhill/6.htm

Remove your HAT to reply directly




[email protected] October 10th 06 07:14 PM

Best MW radio and antenna
 
UP YOU,SC!
cuhulin


[email protected] October 10th 06 07:15 PM

Best MW radio and antenna
 
Ahh never said I am a dxer.
cuhulin


Greg October 11th 06 12:13 AM

Best MW radio and antenna
 
In article ,
Doug Smith W9WI wrote:

Greg wrote:
"Sea gain"? Sounds interesting - please explain. Once while
vacationing on the shore of the Gulf of Mexico, Anna Maria Island,
Florida, I was pulling in all kinds of DX at night on the 20 meter ham
band on my Radio Shack DX-440 portable - much more than I ever did at
home (inland).


The effect is far more dramatic on the MW band!

MW propagation is greatly affected by ground conductivity. FCC
regulation 73.190 (figure R3) is a chart of ground conductivity for the
United States. In New England and the NYC area where MW propagation is
notoriously poor, it ranges from 0.5 to 2mmho/m. Here in the South
where it isn't much better, figures run between 2 and 8. (that includes
Florida) In North Dakota where a single 5kw station can cover the
whole state, figures between 15 and 30 are common.

The chart considers the "ground" conductivity of seawater to be
5000mmho/m. (yes, that's 200 times better than the best land)

Two examples of direct observation:

- Wilmington, NC, at night. Car radio in the beach parking lot: Jamaica
blasting in at entertainment quality on 760 and several other
frequencies. I start driving inland; within a block the signals are
noticably weaker. Within a mile, they're barely audible. When I get
back to my motel about five miles inland, Jamaica is totally gone.

- Massachusetts, high noon, car radio about five miles inland west of
Newburyport. CHTN-720, Prince Edward Island, local quality. Drive
about 20 miles inland to Andover; CHTN gradually fades into nothingness.

Interesting that you observed this on 20m. Maybe less local
interference? The ground conductivity shouldn't have much effect on
shortwave -- greater *distances* (i.e., being within maybe 200 miles of
the Atlantic in Florida, rather than being within 900 miles here in
Tennessee) should make a big difference but I wouldn't think the
difference between Tampa and a Gulf island would be that dramatic.


Interesting topic. I wish I had tried MW DXing.

Less local interference is most likely at least part of my improved
reception on SW. And I live in Lakeland, another 35 miles inland from
Tampa.

Greg

John Smith[_10_] March 5th 14 01:05 PM

Best MW radio and antenna
 
There is only one suitable antenna for this extremely wide frequency spectrum being the Windom. This antenna is effectively a 'serial quarter wavelength'. For MW it would be best to use two such antennas to try have at least some element close to quarter wavelength at any one time. One feature of a quarter wavelength antenna is that it also operates at odd multiples of frequency i.e. that which works at 550kHz will also work at 1650kHz, so only one piece of wire will cover both ends of the band. I admire your thoughts and your way of expressing and putting it in front of readers is really something that I have seen after a long time.Thank you for the site. You also visit http://www.pushbuttonproductions.com/services/radio-ads

DhiaDuit March 8th 14 04:34 PM

Best MW radio and antenna
 
Those push button car radios of years and years ago. They had a habit of drifting off station. Every once in a while they needed to be re set. I have about half a dozen of those old push button car radios.

dave March 9th 14 05:09 PM

Best MW radio and antenna
 
On 03/08/2014 08:34 AM, DhiaDuit wrote:
Those push button car radios of years and years ago. They had a habit of drifting off station. Every once in a while they needed to be re set. I have about half a dozen of those old push button car radios.


I don't remember them as particularly drifty, and I grew up in the
Arizona Desert. They are usually Permeability Tuned (variable inductors)
which are much more stable than most variable capacitors in tuning duty.
Plus the IFs in those days were wide open and stations were allowed to
broadcast in HiFi.

George Cornelius[_3_] March 21st 14 10:09 PM

Best MW radio and antenna
 
On 03/09/2014 01:09 PM, dave wrote:
On 03/08/2014 08:34 AM, DhiaDuit wrote:
Those push button car radios of years and years ago. They had a habit
of drifting off station. Every once in a while they needed to be re
set. I have about half a dozen of those old push button car radios.


I don't remember them as particularly drifty, and I grew up in the
Arizona Desert. They are usually Permeability Tuned (variable inductors)
which are much more stable than most variable capacitors in tuning duty.
Plus the IFs in those days were wide open and stations were allowed to
broadcast in HiFi.


Ferrite cores age, I am told. That could be a reason for a
slow drift (on the order or decades, perhaps).



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