Antenna interaction question
in [Repair]
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From: David on 26 Jan 2010 12:22 <stratus46(a)yahoo.com> wrote in message news:01861131-45de-43a6-80eb-a02d5fc613b9(a)22g2000yqr.googlegroups.com... > On Jan 25, 6:28 am, "David" <some...(a)somewhere.com> wrote: >> <stratu...(a)yahoo.com> wrote in message <snip> >> > FYI since the Digital TV analog shutdown last summer, >> > there are no >> > channel 4s and 8 channel 5s in the country. Low band >> > VHF >> > is no longer >> > coveted real estate. >> >> > G >> >> Actually, Chicago has a digital signal on channel >> 4.(WOCK-CD). See: >> >> http://en.wikipedia.org/wiki/WOCK-CD >> >> David > > When I made that statement I looked through this list > > http://www.dtv.gov/stationlist.htm > > I thought this list was part of the FCC. In any event they > don't list > WOCK which appears to be a comparatively low power > station. Suffice it > to say they are very few low band VHF stations operating > in the US. > > G� I am 36 miles west from their transmitting site and also not in the main lobe. I only noticed they were on the air when I was wondering where some interference on my master antenna was originating. I use a combination band stop - band pass filter to insert an analog channel 4 into my antenna distribution system which is used throughout the house to serve several TV sets with ATSC tuners or digital converters. I use analog channel 4 to send whatever is tuned by a receiver connected to a pay TV service and controlled by RF remotes. This arrangement has worked very well until WOCK increased their power to 3KW. For digital on that channel this is really not low power. Before the transition, the local CBS station was on channel 3 for several years with 4.4KW ERP. Retuning the filters more accurately eliminated the problem and I really was not interested in Korean programming anyhow. I suppose I could have moved the analog channel somewhere else, but that would be a lot of work. David
From: Jeff Liebermann on 29 Jan 2010 12:57
On Fri, 29 Jan 2010 07:06:56 -0800 (PST), "captainvideo462002(a)yahoo.com" <captainvideo462002(a)yahoo.com> wrote: >I'm told that the other receiver does pick up signals from other >transmitters using simple omni directional antennas in the same >general area as ours. The fire dept will not let us tamper with their >equipment so confirming a weak front end is not possible. Its an >almost impossible situation. How does this prevent you from taking a photograph of the antenna structure in order to answer my questions? Yes, the fire department will not let you touch the hardware. However, you can identify the probable cause by substitution (i.e. scanner and 3rd antenna) which will surely attract the attention of their radio service contractor or department. >While I might be able to place a scanner >down in the FD office and try to hear the signal, however it won't be >off the suspect receiving antenna. That's fine. You can then say. It works with my equipment. It doesn't work with your equipment. Your equipment is broken. >And even if I can hear a signal if >it doesn't come in on their receiver, it still is not going to make >them happy. This is a technical newsgroup, not a political. We can identify and solve technical problems. However, if you have a credibility problem with the fire department, I suggest you obtain the assistance of either a technically qualified communications engineer or tech. If that is insufficient to make the fire department "happy", perhaps a local politician might inspire cooperation. >We may have to get the receiver contractor involved. Hint: The more people involved in YOUR problem, the more complicated it will become. Find one person in your area that is familiar with the equipment and let them do the necessary testing. If you call out the troops, there will be plenty of activity and noise, but little useful in the way of a solution. >But >who's going to pay for that? You are. It's *YOUR* problem. As far as the fire department is concerned, at this time, they're equipment works just fine. They can also demonstrate it with tests from other users. >How do I get these jobs anyway? Lenny Karma failure. Good deeds often help. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |