[amsat-bb] Re: 2 Meter TV Interference

[k6yk]

We also still have a channel 13 out of Sacramento.  Most of the rest
of them moved to UHF digital. 
(Too bad channel 13 didn't move, too!  It causes great  QRM on 220
Mhz if you happen to be within a few miles of the transmiiter). 

73,
John K6YK

 
On Wed, 7 Dec 2011 22:11:15 -0000 "John Geiger" <aa5jg at fidmail.com>
writes:
> Rock Island, IL, where I used to live, still has a channel 4 on VHF 
> channel 
> 4.
> 
> 73s John AA5JG
> 
> ----- Original Message ----- 
> From: "Charles Suprin" <hamaa1vs at gmail.com>
> To: "Bob Bruninga" <bruninga at usna.edu>
> Cc: <amsat-bb at amsat.org>; "Gordon JC Pearce" <gordonjcp at gjcp.net>
> Sent: Wednesday, December 07, 2011 9:48 PM
> Subject: [amsat-bb] Re: 2 Meter TV Interference
> 
> 
> >I didn't think there were any vhf stations left. All the numbers on 
> the
> > channels now are virtual. All the tv antenna plans are for uhf 
> bands. A
> > quick look in the Boston market and the lowest channel is 19, 
> channel
> > 2 at 500MHz. Are there places that still use vhf?
> >
> > Charles
> > On Dec 7, 2011 1:38 PM, "Bob Bruninga" <bruninga at usna.edu> wrote:
> >
> >> HPF above 500 MHz?  Then the TV would not be able to see anything 
> but a 
> >> few
> >> UHF channels.
> >>
> >> What is needed is a stub filter.  Just a piece of open ended coax 
> 13" 
> >> long
> >> "T"ed into the antenna lead....
> >>
> >> The 13" is about 66% of a quarter wave at 2 meters.
> >>
> >> Done
> >>
> >> Bob, WB4APR
> >>
> >> -----Original Message-----
> >> From: amsat-bb-bounces at amsat.org 
> [mailto:amsat-bb-bounces at amsat.org] On
> >> Behalf Of Gordon JC Pearce
> >> Sent: Wednesday, December 07, 2011 3:02 AM
> >> To: amsat-bb at amsat.org
> >> Subject: [amsat-bb] Re: 2 Meter TV Interference
> >>
> >> On Tue, 6 Dec 2011 21:17:55 -0600
> >> Wyatt Dirks <wyattdirks at msn.com> wrote:
> >>
> >>
> >> > Just recently I have been having troubles with a neighbor while 
> I am
> >> working the FM satellites(SO-50 and AO-27). The setup I am 
> currently 
> >> using
> >> is my mobile setup because I am unable to put a base station up 
> for many
> >> reasons. I am using a FT8900 with 50 watts out into a 1/4 wave or 
> 1/2
> >> Larson
> >> mobile antenna.The 1/4 wave is mounted permanently via a hole in 
> the roof
> > of
> >> my truck an the 1/2 wave is mounted on a mount opposite the 
> factory
> >> installed FM/AM radio whip. It doesn't seem to matter what 
> antenna I use
> >> for
> >> the problem to occur. Then I use either the arrow antenna or my 
> cju for 
> >> the
> >> downlink.
> >>
> >> Use 5W into a hand-held Yagi.  You'll get far better results.
> >>
> >>
> >> > Today I had another local ham over at the request of the 
> neighbor and 
> >> > his
> >> mobile Kenwood radio did the same thing to the neighbors tv when 
> he
> >> transmitted on 2 meter with 50 watts out. He also recommended 
> that they 
> >> get
> >> a filter. I did not see the specs on the filter nor do I know 
> what
> >> bandwidth
> >> it was for.
> >>
> >> What you want is a highpass filter that will lop off everything 
> below
> >> 500MHz.  The chances are that your TX output is clean enough but 
> the 
> >> little
> >> amplifier in the splitter for the TV is causing all sorts of 
> intermod - 
> >> and
> >> probably covers from broadcast VHF radio to the top of the TV 
> band.
> >>
> >> --
> >> Gordon JC Pearce MM0YEQ <gordonjcp at gjcp.net>
> >> _______________________________________________
> >> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the 
> author.
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> >>
> >> _______________________________________________
> >> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the 
> author.
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> >> program!
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> >>
> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the 
> author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite 
> program!
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> 
> 
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the 
> author.
> Not an AMSAT-NA member? Join now to support the amateur satellite 
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> 
 

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