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CX2SA > SATDIG 07.12.11 22:09l 491 Lines 17804 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V6 662
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Sent: 111207/2003Z @:CX2SA.LAV.URY.SA #:42206 [Minas] FBB7.00e $:AMSATBB6662
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: AMSAT Awards (Jim Adams)
2. 2 Meter TV Interference (Wyatt Dirks)
3. Re: 2 Meter TV Interference (N0JY)
4. Re: Two Meter TV Interference (Clint Bradford)
5. Re: 2 Meter TV Interference (Gordon JC Pearce)
6. Re: Two Meter TV Interference (Tony Langdon)
7. ARISSat SSTV pictures (Roland Zurmely)
8. Re: 2 Meter TV Interference (i8cvs)
9. Re: ARISSat SSTV pictures (Farrell Winder)
10. Re: 2 Meter TV Interference (Glenn Little WB4UIV)
11. Re: Two Meter TV Interference (Jim Adams)
12. Re: 2 Meter TV Interference (John Becker)
13. ARISSat (Roland Zurmely)
14. Re: 2 Meter TV Interference (Bob Bruninga)
15. Re: Two Meter TV Interference (Clint Bradford)
16. New online logging site:AAR29/SAT (Daniel "Nick" Kucij)
17. Re: 2 Meter TV Interference (Tony Langdon)
----------------------------------------------------------------------
Message: 1
Date: Tue, 6 Dec 2011 15:36:03 -0700
From: Jim Adams <jim9251@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AMSAT Awards
Message-ID:
<CAD6RR8hBd_4JN6n9ZuxfQxPxDazTte8KgvFZTTfJOPjSyHyF_g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Congrats yall! Working the sats is a lot of fun.
Jim Adams - K0BAM
Delta County, Colorado Dm68
------------------------------
Message: 2
Date: Tue, 6 Dec 2011 21:17:55 -0600
From: Wyatt Dirks <wyattdirks@xxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] 2 Meter TV Interference
Message-ID: <BAY151-W6219E21E3F1A71FE9F0B4FCDBB0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
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
------------------------------
Message: 3
Date: Tue, 06 Dec 2011 21:48:43 -0600
From: N0JY <n0jy@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <4EDEE21B.5090305@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Wyatt,
How far away is your neighbor?
I TVI myself when I transmit on two meters, I have a Winlink station
running 50W into a J-pole about 20 feet away from my TV antenna, in the
attic. We are on the fringe of the OTA TV coverage, so I have a high
gain TV antenna with a preamp. I also installed an ICE 437B filter. It
appears that since the two are in such close proximity and the TV
signals are so weak, that it doesn't take much to tile the picture or
freeze it for a moment on some of the channels. Such is the nature of
it. Most of our HDTV is on UHF, but channel 8 is on channel 9 (VHF).
Some days the TV signal is stronger, and there are no problems. Most
days, just the opposite.
I have no big solutions, just an observation, but you may be able to
mitigate the problem if you move off to the side of his antenna or
further away from his antenna, or decrease your power.
And maybe one other solution. Fox-1 will have the uplink on 70cm, so
that might make you both happier!
73,
Jerry
N0JY
On 12/6/2011 9:17 PM, Wyatt Dirks wrote:
> 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.
>
>
------------------------------
Message: 4
Date: Tue, 6 Dec 2011 21:55:06 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Two Meter TV Interference
Message-ID: <91BAB220-A873-4813-9E6C-BAFDE2640764@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
It is your neighbor's sub-par electronics that are not properly
filtered/insulated. But no one wants to hear that they need to purchase
a new audio-visual system so a neighbor can play with amateur radio ... (grin)
This is one of our greatest "public relations" problems with the hobby:
Educating non-hams as to what we are doing, why it might cause
interference in their setups, and why we like ugly antennas ...
First - 50W for '50 and '27 is ridiculously high power. You are crippling
yourself with sub-par antennas for working the LEOs. I mean, a
fifteen dollar tape measure beam and a single Watt gets the job done.
If you insist upon this inefficient setup, then you have a couple choices ...
1. Do not operate when your neighbor may be watching TV.
2. Move your car a couple blocks away, if your neighbor may be watching TV.
3. And this is the most exciting alternative: Invite your neighbors over for
a cup of coffee or hot chocolate - about 15 minutes before
a pass of '50 or '27. Show them your setup. Show them a couple ham
magazines. Tell them about amateur radio in your community,
and how your local municipality has included amateur radio in the area's
emergency plans. Gently educate them to the fact that when
an emergency hits the region, it is ham radio that will be assisting the
authorities as things get back to normal. THEN, take 'em out
to your car, and start working the satellite. "And about 600 miles away is a
little cube this big (hold your hands out about 25cm wide)
and listen - we're going to talk THROUGH IT!"
Do not laugh - this tactic has worked for me, and many others. Try it -
before the relationship with your neighbor deteriorates any
further.
Clint Bradford
http://www.k6lcs.com
909-241-7666
------------------------------
Message: 5
Date: Wed, 7 Dec 2011 08:01:43 +0000
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <20111207080143.7099a3fb.gordonjcp@xxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
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>
------------------------------
Message: 6
Date: Wed, 07 Dec 2011 20:06:45 +1100
From: Tony Langdon <vk3jed@xxxxx.xxx>
To: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>, AMSAT BB
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Two Meter TV Interference
Message-ID: <4edf2cb0.049bec0a.49fa.4e11@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 04:55 PM 12/7/2011, Clint Bradford wrote:
>It is your neighbor's sub-par electronics that are not properly
>filtered/insulated. But no one wants to hear that they need to purchase
>a new audio-visual system so a neighbor can play with amateur radio ...
(grin)
>
>This is one of our greatest "public relations" problems with the
>hobby: Educating non-hams as to what we are doing, why it might cause
>interference in their setups, and why we like ugly antennas ...
>
>First - 50W for '50 and '27 is ridiculously high power. You are
>crippling yourself with sub-par antennas for working the LEOs. I mean, a
>fifteen dollar tape measure beam and a single Watt gets the job done.
Yep, don't forget that a good antenna and QRP will go a LONG way
towards reducing TVI. I've found a few Watts near the horizon down
to 200mW at high elevation is all most of the FM birds need, if you
have a decent directional antenna. And a directional antenna will
also mean less TVI for the neighbour.
73 de VK3JED / VK3IRL
http://vkradio.com
------------------------------
Message: 7
Date: Wed, 7 Dec 2011 03:14:48 -0800 (PST)
From: Roland Zurmely <py4zbz@xxxxx.xxx>
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ARISSat SSTV pictures
Message-ID:
<1323256488.16078.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
The latest SSTV pictures I received from ARISSat are here:
http://www.amsat.org/amsat/ariss/SSTV/
http://www.qslnet.de/member/py4zbz/satelite/sstv_via_sat.htm#4
73 de Roland PY4ZBZ
------------------------------
Message: 8
Date: Wed, 7 Dec 2011 13:45:52 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Wyatt Dirks" <wyattdirks@xxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <000701ccb4de$281361c0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- 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
<snip>
<6A5F03940FC948B4A5713E42A3929CDC@xxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hello Roland,
I note many of your received fine pictures which you have submitted. Now
that ARISSat-1 is favoring the southern hemisphere how about trying the
TRANSPONDER with a picture? (435.750 up 145.930 down).
Also since ARISSat is getting closer to earth perhaps it might l be easier
to get through the transponder??
73, Farrell Winder, W8ZCF, Cincinnti, Ohio,USA
--------------------------------------------------
From: "Roland Zurmely" <py4zbz@xxxxx.xxx>
Sent: Wednesday, December 07, 2011 6:14 AM
To: "AMSAT" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ARISSat SSTV pictures
> The latest SSTV pictures I received from ARISSat are here:
>
> http://www.amsat.org/amsat/ariss/SSTV/
>
> http://www.qslnet.de/member/py4zbz/satelite/sstv_via_sat.htm#4
>
> 73 de Roland PY4ZBZ
> _______________________________________________
> 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: 10
Date: Wed, 07 Dec 2011 09:20:19 -0500
From: Glenn Little WB4UIV <glennmaillist@xxxxxxxxx.xxx>
To: Wyatt Dirks <wyattdirks@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <6.2.3.4.2.20111207091704.088ad458@xxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
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.
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.
73
Glenn
WB4UIV
At 10:17 PM 12/6/2011, 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
>s
From: "Bob Bruninga" <bruninga@xxxx.xxx>
To: "'Gordon JC Pearce'" <gordonjcp@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <087001ccb50d$75b43b50$611cb1f0$@xxx>
Content-Type: text/plain; charset="US-ASCII"
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
------------------------------
Message: 15
Date: Wed, 7 Dec 2011 10:37:43 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
To: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Two Meter TV Interference
Message-ID: <15DCE1C8-B883-422D-A891-CECFD0FB5A1A@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
>> ... You are covered by FCC rulesxx.xxx>
To: "Bob Bruninga" <bruninga@xxxx.xxx>, "'Gordon JC Pearce'"
<gordonjcp@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <4edfbf4a.e720340a.2a80.3350@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 05:24 AM 12/8/2011, Bob Bruninga 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....
They work well, have had occasion to use them in the past to cure TVI.
73 de VK3JED / VK3IRL
http://vkradio.com
------------------------------
_______________________________________________
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 662
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