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Old July 18th 08, 04:33 AM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Posts: 172
Default True Outdoor HDTV yagi's

Dear "me" Not big at all. It is intended for high VHF and UHF. I have
it mounted on a tube that is supported in turn by the top section of a
tower, which became surplus after a rotator change. The whole assembly is
in a second story room with the main computer and can be rotated by hand.

It is deceptive to put numbers on the size. The reflector consists of five
doublets each with a tip-to-top length of 26.5 inches and a total height of
a little over 16 inches. The twin "driven" elements are spaced about 6.6
inches in front of the reflectors (obviously the reflectors are only
effective for UHF). The tip-to-tip length of the driven elements is about
34.5 inches (giving a predicted 0.5 WL resonance towards the bottom of the
higher VHF TV band). Each driven element is coaxial with a fan dipole that
should have a resonance somewhere in the UHF band. Thus one expects a small
gain with a small F/B in the higher VHF band and fair gain with good F/B in
the UHF band.

I hope that this is of some assistance. I regret that you believe you must
be anonymous.

Regards, Mac N8TT

--
J. McLaughlin; Michigan, USA
Home:
wrote in message
...
"J. Mc Laughlin" wrote:

I have been using a Winegard HD-1080


How big is it? Compact?



  #32   Report Post  
Old July 18th 08, 05:32 AM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Posts: 50
Default True Outdoor HDTV yagi's

"Hasan Schiers" wrote in message
...
D. Stussy wrote:
"Jim Prescott" wrote in message
...
In article ,
D. Stussy wrote:
"Ch 7 thru 69 DTV"? Only 7-51 is authorized after the transition (US)
Channels 2-51 are all allocated to DTV (except for 37). Channels
2-6 aren't as popular so many people won't need an antenna that can
receive them; some people can even get by with UHF only (14-51). To
be sure about what you will need go to www.tvfool.com and see what
real channels will be used in your area after transition.

http://www.fcc.gov/cgb/consumerfacts/dtvantennas.html


Are you certain? I'm in Los Angeles, the #2 market of the U.S., and

NONE of
our existing stations in Southern California (including the San Diego

market
too) are keeping their allocations on 2-5 (6 is assigned to Mexico, but

even
XETV (FOX) is moving to UHF). None of them have even filed construction
permits for that range - but have actually filed permits for other
allocations (UHF). If there were to be a place where something were to
remain in 2-6, I'd think that the top 10 (out of the ~200 TV markets)

would
have such occur.


Our local ABC affiliate WOI is reverting from UHF to VHF channel 5 in
Feb 2009. It's nuts, but that's what they are doing. Nother station is
going from UHF channel 31 to VHF channel 8...so it is NOT unheard of and
those who blindly go UHF only in an antenna without knowing what EXACTLY
their locals are going to do may find another antenna purchase in their
future.


You are aware that channel 8 is NOT in the 2-6 segment (VHF-low), so that is
irrevelant.

Channels 2-4 = 54-72Mhz.
5-6 = 76-88MHz.
7-13 = 174-216Mhz.


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Old July 18th 08, 05:33 AM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Default True Outdoor HDTV yagi's

wrote in message
...
On Jul 16, 11:36 pm, Steve Urbach wrote:
San Francisco,Oakland,San Jose area
2, 4, 5 are very good and popular stations in the low VHF band


All active analog stations with a digital signal are broadcasting
that digital signal on a different channel. The ATSC tuners maps them
to the displayed channel number. Some 500 stations will flash cut
their digital signal back to their analog channel next February after
the analog shutdown, but the vast majority of the low VHF analog
stations will have their physical be on UHF or upper VHF.

In the San Francisco market,
KTVU-DT Fox 2 is currently on UHF 56, will move to UHF 44 next year.
KRON-DT MyN 4 is currently on UHF 57, will move to UHF 38 next year.
KPIX-DT CBS 5 is currently on UHF 29 and will stay there next year.
KGO-DT ABC 7 is currently on UHF 24, will flash cut to VHF 7 next
year.
KNTV-DT NBC 11 is on UHF 12 and will stay there next year.
....


Which, for the clueless, means NO DTV on 2-6, which is exactly what I said.


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Old July 18th 08, 01:08 PM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Default True Outdoor HDTV yagi's

D. Stussy wrote:

wrote in message
...
On Jul 16, 11:36 pm, Steve Urbach wrote:

San Francisco,Oakland,San Jose area
2, 4, 5 are very good and popular stations in the low VHF band



All active analog stations with a digital signal are broadcasting
that digital signal on a different channel. The ATSC tuners maps them
to the displayed channel number. Some 500 stations will flash cut
their digital signal back to their analog channel next February after
the analog shutdown, but the vast majority of the low VHF analog
stations will have their physical be on UHF or upper VHF.

In the San Francisco market,
KTVU-DT Fox 2 is currently on UHF 56, will move to UHF 44 next year.
KRON-DT MyN 4 is currently on UHF 57, will move to UHF 38 next year.
KPIX-DT CBS 5 is currently on UHF 29 and will stay there next year.
KGO-DT ABC 7 is currently on UHF 24, will flash cut to VHF 7 next
year.
KNTV-DT NBC 11 is on UHF 12 and will stay there next year.
...


Which, for the clueless, means NO DTV on 2-6, which is exactly what I said.


Hi Stussy. Well I see that HDTV arrangements are just as chaotic in the
us as they are in NZ. Even now many in the trade are still "guessing".
We have allocated 6 UHF channels for HDTV but since NZ is a very hilly
country this gives only patchy coverage out to about 50Km with a lot of
dead spots. At least we are keeping SDTV running for a few years yet on
VHF and UHF.
Where I live about 55Km from Auckland we can't get solid HDTV reception
and they aren't using satellite HDTV for free to air Tv for a while, so
we will have to wait despite having a suitable RX.
Let's hope they sort themselves out soon everywhere, though I fear that
things have been allowed to become too disorganised.
Cliff Wright ZL1BDA
  #35   Report Post  
Old July 18th 08, 03:22 PM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Posts: 4
Default True Outdoor HDTV yagi's

D. Stussy wrote:
wrote in message
...
On Jul 16, 11:36 pm, Steve Urbach wrote:
San Francisco,Oakland,San Jose area
2, 4, 5 are very good and popular stations in the low VHF band


All active analog stations with a digital signal are broadcasting
that digital signal on a different channel. The ATSC tuners maps them
to the displayed channel number. Some 500 stations will flash cut
their digital signal back to their analog channel next February after
the analog shutdown, but the vast majority of the low VHF analog
stations will have their physical be on UHF or upper VHF.

In the San Francisco market,
KTVU-DT Fox 2 is currently on UHF 56, will move to UHF 44 next year.
KRON-DT MyN 4 is currently on UHF 57, will move to UHF 38 next year.
KPIX-DT CBS 5 is currently on UHF 29 and will stay there next year.
KGO-DT ABC 7 is currently on UHF 24, will flash cut to VHF 7 next
year.
KNTV-DT NBC 11 is on UHF 12 and will stay there next year.
...


Which, for the clueless, means NO DTV on 2-6, which is exactly what I said.


[adding qualifier] in Frisco, for now.
there is and will be DTV on 2-6 in other areas.


  #37   Report Post  
Old July 18th 08, 10:05 PM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Posts: 3
Default True Outdoor HDTV yagi's

Hasan Schiers wrote:
wrote:
In alt.tv.tech.hdtv G-squared wrote:

| If you don't mind the size of the antenna. The Winegard 7694 is only
| 35" wide vs 110" for the 7082. There is no such ting as an antenna
| "made exactly for DTV". Antennas cover a range of frequencies thet may
| include analog or digital TV. Flatness of response and directionality
| are the important issues and are equally important for analog or
| digital.

However, antennas could be made for "post-transition channel
allocations".
E.g. the UHF antennas tuned for 14-51, and dual-banders for 7-51. And
DTV
benefits more from more directional antennas, so even those will end up
with sales people labelling them as "DTV".


Which will do no good here at all. Post transition our local ABC
affiliate is going to VHF channel 5.

There is no substitute for the long tried and tested combo vhf/uhf
antenna in our area.


I see only 1 ABC affiliate going to VHF 5 post-transition and that is
WOI-DT ABC 5 in Des Moines moving from UHF 59 to VHF 5. Is that your
local ABC affiliate? The FCC database shows WOI-DT with a low STA
(Special Temporary Authority) power of 500 Watts on UHF 59 which is a
very weak power if correct.

The good news to some extent is that WOI-DT was granted their request
to run at an increased power of 8.2 kW (up from 3.91 kW) for the
post-transition VHF 5 allotment which is a good power level for digital
low VHF. In Des Moines, IA, there should be a number of open channels to
broadcast on UHF if WIO wanted to.

Alan F


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Old July 19th 08, 08:33 PM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Posts: 11
Default True Outdoor HDTV yagi's

In alt.tv.tech.hdtv Alan F wrote:
| wrote:
| In alt.tv.tech.hdtv
wrote:
|
| | PS Verizon messed up my usenet access when they dropped alt.* groups.
| | Thanks a lot, Verizon and the NY AG.
|
| I trust that you are calling them every single day to tell them that it is
| absolute stupidity to remove newgroups that have no child porn as part of a
| compaign they claim to be against child porn.
|
| And then you switch to using the NUMBER ONE source of Usenet spam as your
| alternative? Just pray that the spammers don't start doing "followup spam"
| via Google groups to try to get past the blocking that allows followups to
| bypass filters (e.g. I'll figure out how to block it all if spammers do that
| before Google cleans house, and will be quite willing to tell everyone else
| how to do it).
|
| You could, instead, switch to one of the paid Usenet providers, and just
| treat it as Verizon raised your billing price again.
|
| I used google groups as a temporary measure to post because my posts
| were not getting through via the 2 newsgroups services I was trying.
| We'll see if it now all works...

It seems giganews is working for you.

--
|WARNING: Due to extreme spam, googlegroups.com is blocked. Due to ignorance |
| by the abuse department, bellsouth.net is blocked. If you post to |
| Usenet from these places, find another Usenet provider ASAP. |
| Phil Howard KA9WGN (email for humans: first name in lower case at ipal.net) |
  #39   Report Post  
Old July 21st 08, 02:43 AM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Posts: 34
Default True Outdoor HDTV yagi's

Alan F wrote:
Hasan Schiers wrote:
wrote:
In alt.tv.tech.hdtv G-squared wrote:

| If you don't mind the size of the antenna. The Winegard 7694 is only
| 35" wide vs 110" for the 7082. There is no such ting as an antenna
| "made exactly for DTV". Antennas cover a range of frequencies thet may
| include analog or digital TV. Flatness of response and directionality
| are the important issues and are equally important for analog or
| digital.

However, antennas could be made for "post-transition channel
allocations".
E.g. the UHF antennas tuned for 14-51, and dual-banders for 7-51.
And DTV
benefits more from more directional antennas, so even those will end up
with sales people labelling them as "DTV".


Which will do no good here at all. Post transition our local ABC
affiliate is going to VHF channel 5.

There is no substitute for the long tried and tested combo vhf/uhf
antenna in our area.


I see only 1 ABC affiliate going to VHF 5 post-transition and that is
WOI-DT ABC 5 in Des Moines moving from UHF 59 to VHF 5. Is that your
local ABC affiliate? The FCC database shows WOI-DT with a low STA
(Special Temporary Authority) power of 500 Watts on UHF 59 which is a
very weak power if correct.

The good news to some extent is that WOI-DT was granted their request
to run at an increased power of 8.2 kW (up from 3.91 kW) for the
post-transition VHF 5 allotment which is a good power level for digital
low VHF. In Des Moines, IA, there should be a number of open channels to
broadcast on UHF if WIO wanted to.

Alan F



Yes, that is the station and they have applied for a further increase in
power to around 13 kW, but I don't know if it has been granted. So, we
do have a low band vhf station that will "appear" in Feb 2009. I am at a
total loss to explain why they made this decision...it is likely to
reduce their footprint significantly. Channel 8-1 is doing the same
thing, moving from RF Ch 31 to RF Ch 8, at the same time.

Ch 5 analog has been famous for years here for having a rotten signal.
When they went digital to 5-1 on UHF, they skyrocketed and have been
solid....now they are going back and probably in the toilet again. Thank
God ABC lost Monday Night Football.
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Old July 21st 08, 02:16 PM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
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Posts: 3
Default True Outdoor HDTV yagi's

Hasan Schiers wrote:
Alan F wrote:
Hasan Schiers wrote:
Which will do no good here at all. Post transition our local ABC
affiliate is going to VHF channel 5.

There is no substitute for the long tried and tested combo vhf/uhf
antenna in our area.


I see only 1 ABC affiliate going to VHF 5 post-transition and that is
WOI-DT ABC 5 in Des Moines moving from UHF 59 to VHF 5. Is that your
local ABC affiliate? The FCC database shows WOI-DT with a low STA
(Special Temporary Authority) power of 500 Watts on UHF 59 which is a
very weak power if correct.

The good news to some extent is that WOI-DT was granted their request
to run at an increased power of 8.2 kW (up from 3.91 kW) for the
post-transition VHF 5 allotment which is a good power level for digital
low VHF. In Des Moines, IA, there should be a number of open channels to
broadcast on UHF if WIO wanted to.

Alan F


Yes, that is the station and they have applied for a further increase in
power to around 13 kW, but I don't know if it has been granted. So, we
do have a low band vhf station that will "appear" in Feb 2009. I am at a
total loss to explain why they made this decision...it is likely to
reduce their footprint significantly. Channel 8-1 is doing the same
thing, moving from RF Ch 31 to RF Ch 8, at the same time.

Ch 5 analog has been famous for years here for having a rotten signal.
When they went digital to 5-1 on UHF, they skyrocketed and have been
solid....now they are going back and probably in the toilet again. Thank
God ABC lost Monday Night Football.


WOI-DT applied for a 11.5 kW ERP on VHF 5 in June, but the FCC has not
granted or rejected the application yet. The only real reason I can see
for going to low-VHF for where they are is to save money by re-using the
VHF 5 antenna & transmitter and for the lower operating costs of low
VHF. Their UHF 59 digital signal is out of core, so they have to give
that up. If they have interference problems for analog on VHF 5, that
won't go away for digital VHF 5.

You have 3 stations in Des Moines do a digital flash cut to their
upper VHF analog channel. Upper VHF at 174 to 216 MHz (compared to low
VHF at 54 to 88 MHz) is considered a good band for digital broadcasting.

KCCI-DT CBS 8 will move from 31 to VHF 8 at 23 kW ERP.
KDIN-DT PBS 11 will move from UHF 50 to 11 at 19.8 kW, but plans to
operate on UHF 50 for a while after the analog shutdown for VHF 11
antenna work
(http://fjallfoss.fcc.gov/prod/cdbs/f...bit_id=618292).
WHO-DT NBC 13 will move from UHF 19 to VHF 13 at 29 kW ERP.

All 3 of them will have respectable power levels for digital upper
VHF. I also see that KDMI-DT My Network 56(?) will take over KCCI's RF
31 antenna and transmitter. Good luck with WOI-DT reception after they
switch.

Alan F


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