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Antenna Choice and Location for Mid Peninsula   Message List  
Reply | Forward Message #26532 of 28586 |
Re: Antenna Choice and Location for Mid Peninsula

--- In HDTV-in-SFbay@yahoogroups.com, Larry Kenney <Larry@...> wrote:
>
> Tom...
>
> The digital channels for 2 and 4 are next to each other at the high
> end of the band on channels 56 and 57. They are transmitting with
> full power from the same antennas as the other stations on Sutro
> Tower and you should be receiving them in your area. Either you're
> experiencing multipath reflection problems for those channels or your
> antenna might be slightly out of alignment.

For some reason, I have multipath problems with KTVU and KRON as well. Part of
my
problem is that I'm trying to optimize the antenna for KRCB, but when I do that,
it
DEoptimizes it for Sutro, to the point that KTVU and KRON both fall out. Since I
don't have
any problem at all with KCSM or KBCW, the hope is that in February KTVU and KRON
will
start working better despite the antenna being pointed towards KRCB.


> It's interesting that your strongest station is KNTV, which is on
> VHF, since you're using an antenna that's primarily made for UHF.
> Hopefully it will work as well for you for KGO when they move their
> digital transmissions to channel 7 in February.

A couple months ago, KGO did a test transmission overnight on 7. I have a 5
element
VHF-HI Yagi pointed towards Fremont Peak and my reception for the ersatz KGO-DT
was
essentially the same as for KNTV-DT. Both had 100% S/N ratio and about 75%
signal
quality (probably multipath due to receiving them off the back of the Yagi).

So my conclusion is that anyone who's getting KNTV-DT now should have no trouble
also
getting KGO-DT in Feb. Exceptions would be folks who have localized issues
relating to
the differences between Sutro Tower and Mt. San Bruno, and there should be few
of those.






Wed Dec 3, 2008 9:03 pm

nwsayer
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Message #26532 of 28586 |
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Tom... The digital channels for 2 and 4 are next to each other at the high end of the band on channels 56 and 57. They are transmitting with full power from...
Larry Kenney
larrykenney
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Dec 3, 2008
8:35 pm

... For some reason, I have multipath problems with KTVU and KRON as well. Part of my problem is that I'm trying to optimize the antenna for KRCB, but when I...
Nick Sayer
nwsayer
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Dec 3, 2008
9:03 pm

... have a 5 element ... ersatz KGO-DT was ... 75% signal ... Yagi). ... no trouble also ... issues relating to ... should be few of those. ... Exceptions...
Bob
bob_lopaka
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Dec 4, 2008
12:25 am

Anyone using a CM-4228 and experiencing problems with VHF should consider changing to the new CM4228HD when they become available. It might prevent the need...
Richard Swank
rswank631
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Dec 4, 2008
2:11 am

... I also use a 4228 and am in the South Bay (~45 miles). KTVU-DT and KRON-DT are my problem childs as well. I have external tuners (LGs) that can usually get...
Kevin Diggs
mischeviousrat
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Dec 4, 2008
3:00 am

... Here's my report from San Francisco using a CM4228 and a rotor. I'm referring to just the digital stations here, but will be using the virtual channel...
Larry Kenney
larrykenney
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Dec 4, 2008
7:29 am

... I suspect many others besides myself are/will be counting on those changes on the transmitting side to get their favorite stations consistantly with less...
epicurusradium
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Dec 4, 2008
8:03 pm

... KNTV-DT is licensed for 103.1 kW. KGO-DT is licensed for 24 kW. This is a little less than one quarter the power of KNTV-DT, not half, a difference of...
Bob
bob_lopaka
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Dec 4, 2008
10:04 pm

... Here's the overall plan and schedule for Bay Area stations. There will be a minor change made at KNTV. KNTV plans to move their digital antenna to the top...
Larry Kenney
larrykenney
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Dec 4, 2008
10:14 pm

Larry, as always, great information. Thanks. Do you by any chance know what are the planned events for Walnut Grove?...
red2grass
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Dec 5, 2008
10:31 pm

... I don't know all the details, but I do know that KVIE 6 will be moving their digital from channel 53 to channel 9, KXTV 10 will be moving from channel 61...
Larry Kenney
larrykenney
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Dec 6, 2008
1:31 am

Nothing is published, but Larry's summary below appears to be accurate. There is always the possibility of supplier and construction delays, which is why...
Don Hackler
donhackler
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Dec 7, 2008
7:41 pm

... Well, just for the record, I'll run down everything. I'm in Santa Clara, near the corner of Pruneridge and Winchester (the southeast corner of the city). I...
Nick Sayer
nwsayer
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Dec 4, 2008
7:26 pm

Nick, thanks for posting the details. KSBW and KCBA are only six degrees away from the Sutro group from your location, but they are in the VHF-hi range. Your...
Frank Nemec W6NJR
fanemec
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Dec 5, 2008
4:52 pm

... ??? Um.... 186 degrees, you mean? They're almost exactly the *opposite* direction. ... Um, or using a VHF Yagi, like I'm doing now. :) ... Well, it's more...
Nick Sayer
nwsayer
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Dec 5, 2008
9:11 pm

"Your best bet might be modifying your 4228 to make it closer to the new design, with the single continuous screen, by making some electrical connection...
zanzi1998
zanzi1999
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Dec 6, 2008
6:19 pm

... The objective is to improve the ability of the 4228 to receive on high VHF. On high VHF, the reflector grid itself acts as an antenna. If you electrically...
Nick Sayer
nwsayer
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Dec 6, 2008
11:44 pm

But you still didn't answer my question about what is the best way to bond the two screens together. I'm trying to make the 4228 more effective for receiving...
zanzi1998
zanzi1999
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Dec 7, 2008
2:20 pm

... I'd try and solder the two screens together every 2 or three inches. I don't know what metal the screen is made out of, but hopefully ordinary solder would...
Nick Sayer
nwsayer
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Dec 8, 2008
12:14 am

The elements of the CM 4228 are aluminum, which is notoriously difficult to solder. I'd buy some aluminum or stainless steel wire and run it back and forth...
Frank Nemec W6NJR
fanemec
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Dec 11, 2008
1:39 am

I'd suggest using some of the rubber hose clamps that tighten down fairly well. Two or three of them should make a good bond. These clamps are usually...
Swank, Richard (NBC U...
Richard.Swank@...
Send Email
Dec 11, 2008
1:44 am

... Uh ... Are we certain that the screen is aluminum? Isn't that wire mesh stuff usually made up of stuff dominated by Fe (Iron for those who have forgotten...
Kevin Diggs
mischeviousrat
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Dec 12, 2008
4:07 am

The screen is indeed aluminum. The product catalog says so, and nearly all residential TV antennas use aluminum elements for high conductivity and low cost...
Frank Nemec W6NJR
fanemec
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Dec 12, 2008
4:33 pm

Almost all TV broadcast antennas are horizontally polarized. Nothing on Sutro now is vertical. A few stations elsewhere have experimented with circular (equal...
Don Hackler
donhackler
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Dec 12, 2008
4:49 pm

Don is correct, the antenna's on Sutro are all Horizontally polarized, both Analog and Digital. Most of the new Main Digital TV Antennas on Sutro will have a...
Bob
bob_lopaka
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Dec 12, 2008
7:11 pm

Confused here..... If circular polarization is achieved by using 2 separate antennas and assuming an instance of perfect circular pattern with as you say (in ...
epicurusradium
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Dec 12, 2008
9:34 pm

There aren't usually two separate antennas, just one antenna. If the assigned ERP is 500kW, and the antenna is circular, the horizontal and vertical...
Don Hackler
donhackler
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Dec 13, 2008
1:12 am

... Just for the record I was referring to the screen for the old style 4228. Is that the one you are talking about?...
Kevin Diggs
mischeviousrat
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Dec 13, 2008
3:48 am

The broadcast antennas are physically vertical looking but they transmit in the horizontal plane. All television stations are licensed to operate at their...
Richard Swank
rswank631
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Dec 13, 2008
2:44 pm

Larry, I do have the VHF outdoor antenna ... I just added the 4228 for UHF digital channels. And thanks for the explanation, it makes sense now. Another...
Tom Ho
tomtho
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Dec 4, 2008
2:05 am
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