RE: [HDTV-in-SFbay] Re: Antenna Choice and Location for Mid Peninsula
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 for the VHF antenna. Of course a CM-7777
preamp would be a wise decision as well.
From:
HDTV-in-SFbay@yahoogroups.com [mailto:HDTV-in-SFbay@yahoogroups.com] On Behalf Of Bob Sent: Wednesday, December 03, 2008
4:26 PM To: HDTV-in-SFbay@yahoogroups.com Subject: [HDTV-in-SFbay] Re:
Antenna Choice and Location for Mid Peninsula
--- In
HDTV-in-SFbay@yahoogroups.com, "Nick Sayer"
<nsayer@...> wrote:
>
> A couple months ago, KGO did a test transmission overnight on 7. I have a
5 element
> VHF-HI Yagi pointed towards FremontPeak 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 SutroTower and Mt.San Bruno, and there
should be few of those.
> Exceptions would also go to
some viewers using a CM 4228 which does not perform as well on VHF channel
7 as it does on VHF channel 12. Also, KNTV-DT is licensed for 103.1 kW
compared to KGO-DT at 24 kW, a difference of 6.33 dB. If a viewer is
close to the cliff edge for KNTV-DT they may not be able to pick up KGO-DT, but
again it all goes to the type of antenna one is using and their location.
... have a 5 element ... ersatz KGO-DT was ... 75% signal ... Yagi). ... no trouble also ... issues relating to ... should be few of those. ... Exceptions...
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...
... 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...
... 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...
... 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...
... 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...
... 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...
... 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...
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...
... 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, 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...
... ??? 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...
"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...
... 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...
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...
... 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...
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...
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@...
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...
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...
Almost all TV broadcast antennas are horizontally polarized. Nothing on Sutro now is vertical. A few stations elsewhere have experimented with circular (equal...
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...
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 ...
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...
The broadcast antennas are physically vertical looking but they transmit in the horizontal plane. All television stations are licensed to operate at their...
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...
The dB loss per hundred feet of coax is a function of the frequency. The higher the frequency, the worse the losses. But you have an amp, which means that you...
Having problems with message search?
Offline 
Send Email