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CX2SA > SATDIG 08.12.11 04:06l 974 Lines 32582 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Two Meter TV Interference (John Becker)
2. Re: 2 Meter TV Interference (Ernie Howard)
3. Re: 2 Meter TV Interference (Gordon JC Pearce)
4. Re: 2 Meter TV Interference (Charles Suprin)
5. Re: 2 Meter TV Interference (Gordon JC Pearce)
6. Re: 2 Meter TV Interference (John Geiger)
7. Re: 2 Meter TV Interference (Patrick STODDARD (WD9EWK/VA7EWK))
8. IC 910H Hints? (Joe Batty)
9. Re: IC 910H Hints? (Larry Gerhardstein)
10. Re: 2 Meter TV Interference (i8cvs)
11. Re: 2 Meter TV Interference (Bob Bruninga)
12. Re: 2 Meter TV Interference (Bob Bruninga)
13. Re: 2 Meter TV Interference (k6yk)
14. FW: [radio_pack] FW: A Ham's Night Before Christmas - YouTube
(Kevin Deane)
15. Re: 2 Meter TV Interference (Jim Shorney)
16. Voyager 1 Near Edge Of Solar System (B J)
----------------------------------------------------------------------
Message: 1
Date: Wed, 07 Dec 2011 14:16:09 -0600
From: John Becker <w0jab@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Two Meter TV Interference
Message-ID: <5.2.0.9.2.20111207141202.00bdcbf0@xxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I really did not mean it to sound so cold and blunt.
but the fact it that it is best to not touch it. Give all
the advice you like.
John
At 12:37 PM 12/7/2011, you wrote:
>>> ... You are covered by FCC rules already. Tell him to call a TV repair
service.
>
>That is the absolute WORST advice a ham can EVER give to a neighbor - if
that ham desires harmony in the neighborhood.
>
>Sure, this guy's mobile rig is probably within specs for a ham radio
transceiver. And, yes, the neighbor's feedline or spliiter is
>indeed faulty.
>
>But to tell the offended neighbor, "I have the FCC on MY side, buddy!" is
tantamount to declaring war.
>
>But that IS easier - and less time consuming - for a ham to do: Just stick
one's nose in the air and cite FCC regs.
>
>But a TRUE amateur radio operator will embrace this opportunity to educate
and enlighten.
>
>Clint Bradford, K6LCS
>909-241-7666
>
>
>
>
>
>
>
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Wed, 07 Dec 2011 16:31:17 -0500
From: Ernie Howard <w8eh.ernie@xxxxx.xxx>
To: Wyatt Dirks <wyattdirks@xxx.xxx>, "'AMSAT-BB@xxxxx.xxxxx
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <4EDFDB25.6000904@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Wyatt,
In all the replies that I read so far I have not seen much help for you.
Here are a few tips.
The problem is your neighbor's amplified splitter can't handle a strong
nearby signal. Your neighbor has to fix the problem.
The only solution is for your neighbor to remove the powered splitter
from the antenna system. All consumer type powered TV splitters are
broadband and will amplify everything from 50 mhz to 700 mhz. That is
the problem, since your two meter signal is in the middle of the amp's
passband. Any strong signal in the range from 50 to 700 mhz will swamp
the transistors in the amplified splitter and block TV signals from
being received. After he removes the amplified splitter, he can replace
it with a passive splitter. Hopefully he is close enough to the TV
stations that he doesn't need amplification. If not, he may need to
consider a proper high gain antenna outside.
The only other solution (as your local ham friend suggested) would be to
get a stopband filter(blocking 144 to 148), and have your neighbor place
it in between his antenna and TV amplifier. The problem is that these
type of special filters are not cheap. And the neighbor might blame you
if something happened to his TV..... ICE has a filter for this
application. Not sure if they are still in production.
http://www.iceradioproducts.com/filtersrf.html
At my QTH I have to newer HDTVs connected to a high gain directional
antenna pointed to stations 30 miles away. They are fed by coax with a
PASSIVE type two-way splitter. (No amplified splitters, no special
filters.) My two meter or 70 cm radios do not bother reception on either TV.
Your problem is similar to the problem that I run into when camping with
my RV. The 'batwing' type antennas that are on most RV units have a
built in amplifier in the head outside. ANY signal, even down to 1/2
watt, overloads my amplified TV antenna in the RV and any other RV close
to my 2 meter or 70 cm antennas.
To the guys who say he is running too much power... that isn't a fix.
There are other uses for his 'power' other than talking to satellites.
This problem will prevent him from using his two meter radio any time at
his house.
Ernie W8EH
On 12/6/2011 10:17 PM, Wyatt Dirks 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.
>
> The problem occurs while I am transmitting. The neighbor says that his tv
receives the interference in that the picture is disturbed and sometimes
cuts out completely. He is getting his tv from hdtv over the air. He has an
antenna in the attic that goes to a powered splitter which then goes to
several tvs. That is about all i know on his setup but I do know that if he
cuts the power to the splitter he receives nothing. Also the problem seems
to be on every channel.
>
> 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.
>
> If anyone has any ideas on what would solve this problem and could share
that would be great.
>
> Catch you on the birds
>
> Wyatt AC0RA
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Wed, 7 Dec 2011 21:48:26 +0000
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <20111207214826.3e33f5c6.gordonjcp@xxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
On Wed, 07 Dec 2011 09:20:19 -0500
Glenn Little WB4UIV <glennmaillist@xxxxxxxxx.xxx> wrote:
> This is probably front end overload on a TV without a front end.
> Can you spell SDR?
> The TV may now be using this technology.
Even TV frontends that *do* use SDR use extensive filtering and a
downconverter to go from the UHF input to a fairly "normal" 40MHz-ish IF.
> A digital TV MUST receive all of the packets to display a useable picture.
> If it looses enough packets, it will not decode anything.
>
> You probably cannot fix the problem with this TV.
I don't see why you couldn't. You just need to get rid of that grubby
little splitter, and fit a highpass filter to keep the VHF signal out. I do
this all the time.
--
Gordon JC Pearce MM0YEQ <gordonjcp@xxxx.xxx>
------------------------------
Message: 4
Date: Wed, 7 Dec 2011 16:48:49 -0500
From: Charles Suprin <hamaa1vs@xxxxx.xxx>
To: Bob Bruninga <bruninga@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx Gordon JC Pearce <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID:
<CALyAeG815Vip8QHFn5h7XWU4P8ENxoC_pgAfvhyH_dwCtjcayA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
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@xxxxxx. Are there places that still use vhf?
Charles
On Dec 7, 2011 1:38 PM, "Bob Bruninga" <bruninga@xxxx.xxx> 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@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Gordon JC Pearce
> Sent: Wednesday, December 07, 2011 3:02 AM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: 2 Meter TV Interference
>
> On Tue, 6 Dec 2011 21:17:55 -0600
> Wyatt Dirks <wyattdirks@xxx.xxx> 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@xxxx.xxx>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 5
Date: Wed, 7 Dec 2011 21:49:27 +0000
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <20111207214927.9f811ec5.gordonjcp@xxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
On Wed, 7 Dec 2011 13:45:52 +0100
"i8cvs" <domenico.i8cvs@xxx.xx> wrote:
> WOW.....50 watt out working the FM satellites SO-50 and AO-27 ? ?
>
> Reduce your power to maximum 5 watt ( 10 dB less than 50)
> and see if you can solve the TVI problem using a decent directional
> antenna enstead of a 1/4 wave or 1/2 Larson mobile antenna.
Hang on, hang on, do I still need 1kW ERP to hit VO52 with CW? ;-)
I must admit I *always* run full QRO on the FM sats - a whopping 4.5W into a
6dB yagi.
--
Gordon JC Pearce MM0YEQ <gordonjcp@xxxx.xxx>
------------------------------
Message: 6
Date: Wed, 7 Dec 2011 22:11:15 -0000
From: "John Geiger" <aa5jg@xxxxxxx.xxx>
To: "Charles Suprin" <hamaa1vs@xxxxx.xxx>, "Bob Bruninga"
<bruninga@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx Gordon JC Pearce <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <7F76C22DD2DF4E8DBA8FA312B324873B@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
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@xxxxx.xxx>
To: "Bob Bruninga" <bruninga@xxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>; "Gordon JC Pearce" <gordonjcp@xxxx.xxx>
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@xxxxxx. Are there places that still use vhf?
>
> Charles
> On Dec 7, 2011 1:38 PM, "Bob Bruninga" <bruninga@xxxx.xxx> 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@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>> Behalf Of Gordon JC Pearce
>> Sent: Wednesday, December 07, 2011 3:02 AM
>> To: amsat-bb@xxxxx.xxx
>> Subject: [amsat-bb] Re: 2 Meter TV Interference
>>
>> On Tue, 6 Dec 2011 21:17:55 -0600
>> Wyatt Dirks <wyattdirks@xxx.xxx> 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@xxxx.xxx>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite
>> program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite
>> program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 7
Date: Wed, 7 Dec 2011 15:16:01 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID:
<CAN6TEUeMLVGmX9sBoDsjRy=en9i0B9eaors=M_s0-Jr-WpyXYA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Charles,
> 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@xxxxxx. Are there places that still use vhf?
The Phoenix area still has 3 TV stations on the high VHF channels
7-13 (KAET/PBS on 8, KSAZ/Fox on 10, KPNX/NBC on 12), but none
on the low VHF channels 2-6. The Tucson area still has one station
on the high VHF channels, and southwestern Arizona around Yuma
has 3 - also on high VHF channels. There are many low-power TV
stations and translators around Arizona still operating on both low
and high VHF channels. Many of these are still broadcasting in
analog, as these stations were not required to make the change to
digital TV along with the full-power stations. Some translator
stations are now being moved to digital TV in rural Arizona.
An explanation on why many TV stations are now on UHF channels
instead of VHF in the USA is at:
http://en.wikipedia.org/wiki/DTV_transition_in_the_United_States#VHF_frequenci
es_and_digital_television
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 8
Date: Wed, 7 Dec 2011 14:31:15 -0800 (PST)
From: Joe Batty <jbat@xxxxxxxxxx.xxx>
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] IC 910H Hints?
Message-ID:
<1323297075.89555.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hi Folks,
?
I'm trying to learn all the little ins and outs of the IC 910H?that I've had
for a short time. Is there an active?station in the Portland, OR or
Beaverton, Hillsboro area that has this radio that I can communicate with to
help?learn some little hints and quirks for it's operation. Especially when
it comes to using SatPC32 and the LVB Tracker interface. It's all working,
but I'd really like to become a lot more efficient with?the radio,
software?and the protocol. I don't hink I'm being very efficient with?either
the radio and software.
?
Being a newbie to Sats I'd really like to get the operating procedures down
like I know what I'm doing. hihi
?
Thank so much?to all?the Amsat folks, Dee especially,?and have a great
holiday.
?
Also, a very?honorable thank you to those surviving Pearl Harbor Day, Dec.
7th 1941. A very special day indeed?for our real hero's.
?
73? Joe KT7E
from the great wet Pacific North West
------------------------------
Message: 9
Date: Wed, 07 Dec 2011 23:04:46 +0000
From: Larry Gerhardstein <W7IN@xxxxxxx.xxx>
To: Joe Batty <jbat@xxxxxxxxxx.xxx>
Cc: Amsat-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: IC 910H Hints?
Message-ID: <4EDFF10E.3010601@xxxxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
Joe, W7TYN, does birds and lives in Portland area. Don't know what he
runs. I have a IC910H and SatPC32 but do not live in Portland area,
rather in Montana. Sorry, but I am not available for birder scheds
right now.
73, Larry W7IN
------------------------------
Message: 10
Date: Thu, 8 Dec 2011 00:24:21 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Bob Bruninga" <bruninga@xxxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>, "Wyatt Dirks" <wyattdirks@xxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <003401ccb537$5aff20c0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Bob Bruninga" <bruninga@xxxx.xxx>
To: "'Gordon JC Pearce'" <gordonjcp@xxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Wednesday, December 07, 2011 7:24 PM
Subject: [amsat-bb] Re: 2 Meter TV Interference
> 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
Hi Bob, WB4APR
If the "open stub" is tuned to the 2 meters band and attached to the TV-set
of one's neighbour a reduction of the 2 m signals of 25 to 30 dB may be
expected.
At the same time all odd harmonics of the design frequency (3f, 5f, etc
will be attenuated as well.
Since the UHF amateur is particularly concerned with f and 3f this "open
stub" is usefull as well when one transmit in 432-435 MHz
On the other side if the quality of the previously good and clear TV-picture
is reduced upon correct insertion of the "open 1/4 wave stub" one should
investigate whether 3f, 5f, or 7f fall into the television frequency band.
If this is the case it may become necessary to tune to a different TV
channel or turn the antenna to a different TV-station.
I have just received a suggestion from James VK6FJA that I agree
because of my previous experience in solving my TVI problems in
HF and VHF in my condo.
"Nothing can be done to the Tx, better to offer a working filter to the
Rx side! "
http://www.rjmb.net/vk6fja/tvi-filter/index.htm
This 144 MHz Stop-Band TVI Filter is based on a QST article found
online.
VK6FJA says to me "it works just fine - and it can be aligned without
the test gear, there's only 2 trimmers in it."
73" de
i8CVS Domenico
----- Original Message -----
From: "Wyatt Dirks" <wyattdirks@xxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Wednesday, December 07, 2011 4:17 AM
Subject: [amsat-bb] 2 Meter TV Interference
>
> 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.
> 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.
>
> If anyone has any ideas on what would solve this problem and could share
> that would be great.
>
> Catch you on the birds
>
> Wyatt AC0RA
>
------------------------------
Message: 11
Date: Wed, 7 Dec 2011 18:38:36 -0500
From: "Bob Bruninga" <bruninga@xxxx.xxx>
To: "'Gordon JC Pearce'" <gordonjcp@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <08ab01ccb539$56dfe9a0$049fbce0$@xxx>
Content-Type: text/plain; charset="US-ASCII"
>> 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.
> That could work too, but not if they have an active splitter
> that's distorting and crunching away like a little fuzzbox,
> generating all kinds of harmonics.
In that case, the stub needs to go on the input of that device. Though, I
have not seen a lot of "F" connector "T"'s... which would make it easy. So
best to take a piece of cable with "F"'s on both ends, and "splce" the stub
in the center by soldering carefully and sealing it all up.
Bob, WB4APR
------------------------------
Message: 12
Date: Wed, 7 Dec 2011 18:42:31 -0500
From: "Bob Bruninga" <bruninga@xxxx.xxx>
To: "'Ernie Howard'" <w8eh.ernie@xxxxx.xxx>, "'Wyatt Dirks'"
<wyattdirks@xxx.xxx>, "'AMSAT-BB@xxxxx.xxxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <08af01ccb539$e2efc730$a8cf5590$@xxx>
Content-Type: text/plain; charset="US-ASCII"
> The only solution is for your neighbor to remove the
> powered splitter from the antenna system....
> The only other solution would be to get a stopband
> filter(blocking 144 to 148)... these type of special
> filters are not cheap.
Again, a 5 cent piece of coax cut as a 1/4 wave stub at 2 meters will knock
the signal at the input of that amp down by 10 to 20 dB. That is always the
first approach for eliminating TVI and is cheap and cost effective and fully
viable.
Bob, Wb4APR
------------------------------
Message: 13
Date: Wed, 7 Dec 2011 16:10:41 -0800
From: k6yk <k6yk@xxxx.xxx>
To: aa5jg@xxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxxx gordonjcp@xxxx.xxx
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <20111207.161410.1638.126896@xxxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
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@xxxxxxx.xxx>
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@xxxxx.xxx>
> To: "Bob Bruninga" <bruninga@xxxx.xxx>
> Cc: <amsat-bb@xxxxx.xxx>; "Gordon JC Pearce" <gordonjcp@xxxx.xxx>
> 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@xxxxxx. Are there places that still use vhf?
> >
> > Charles
> > On Dec 7, 2011 1:38 PM, "Bob Bruninga" <bruninga@xxxx.xxx> 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@xxxxx.xxx
> [mailto:amsat-bb-bounces@xxxxx.xxxx On
> >> Behalf Of Gordon JC Pearce
> >> Sent: Wednesday, December 07, 2011 3:02 AM
> >> To: amsat-bb@xxxxx.xxx
> >> Subject: [amsat-bb] Re: 2 Meter TV Interference
> >>
> >> On Tue, 6 Dec 2011 21:17:55 -0600
> >> Wyatt Dirks <wyattdirks@xxx.xxx> 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@xxxx.xxx>
> >> _______________________________________________
> >> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the
> author.
> >> Not an AMSAT-NA member? Join now to support the amateur satellite
>
> >> program!
> >> Subscription settings:
> http://amsat.org/mailman/listinfo/amsat-bb
> >>
> >> _______________________________________________
> >> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the
> author.
> >> Not an AMSAT-NA member? Join now to support the amateur satellite
>
> >> program!
> >> Subscription settings:
> http://amsat.org/mailman/listinfo/amsat-bb
> >>
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the
> author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the
> author.
> Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
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------------------------------
Message: 14
Date: Wed, 7 Dec 2011 16:22:10 -0800
From: Kevin Deane <summit496@xxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] FW: [radio_pack] FW: A Ham's Night Before
Christmas - YouTube
Message-ID: <COL107-W21D1CDE55A8A0D54CA512783B80@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Kevin
KF7MYK
From: EH@xxxx.xxx
To: radio_pack@xxxxx.xxx.xxx
Date: Wed, 7 Dec 2011 15:52:57 -0800
Subject: [radio_pack] FW: A Ham's Night Before Christmas - YouTube
Thanks to Jack W3FUN... Good enough to share with all and A Very Merry
Christmas to all... Erv KB7IWT
http://www.youtube.com/watch?v=c_9REVC4dtc
------------------------------
Message: 15
Date: Wed, 07 Dec 2011 19:38:36 -0600
From: "Jim Shorney" <jshorney@xxxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <20111208013828.2CD293B31EE@xxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
On Wed, 7 Dec 2011 16:48:49 -0500, Charles Suprin wrote:
>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@xxxxxx. Are there places that still use vhf?
I have channel 8 and channel 10 VHF locals in my area. I use a Channel Plus
DA-500A preamp in my system. It was recommended by a VHF guru as a high-power
preamp that is more overload immune. I have a K1UFH 144.200 notch ahead of it
to keep my APRS digi out, and had to throw a coulple of FM traps on the input
still, to keep out herringbone from strong local FM stations (back in analog
days), but it was still much better than the cheapo consumer stuff even
without
the extra filters.
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A,
GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time!
"Give a man a URL, and he will learn for an hour; teach him to Google, and
he will learn for a lifetime."
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org
------------------------------
Message: 16
Date: Thu, 8 Dec 2011 01:58:03 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Voyager 1 Near Edge Of Solar System
Message-ID:
<CAP7QzkNPc_uNVuUjqPjLZiE9k5HMETx6shouABirNXN1TRKxvw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://spaceflightnow.com/news/n1112/06voyager/
I remember when it and Voyager 2 were launched in 1977. I don't think
anyone could have predicted that it would last this long or go so far.
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 6, Issue 663
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