[amsat-bb] Re: 2 Meter TV Interference
On Tue, 6 Dec 2011 21:17:55 -0600 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. 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: Two Meter TV Interference
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 ___ Sent via AMSAT-BB@amsat.org. 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
[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@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
- Original Message - From: "Wyatt Dirks" To: 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 > Hi Wyatt, WC0RA 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. 73" de i8CVS Domenico ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: ARISSat SSTV pictures
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" Sent: Wednesday, December 07, 2011 6:14 AM To: "AMSAT" 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@amsat.org. 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@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
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 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@amsat.org. 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@amsat.org. 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
[amsat-bb] Re: Two Meter TV Interference
I agree with Clint's observations. I use an ht with 1 watt and a handheld antenna and do just fine. It's your neighbors goofy setup causing him problems. Jim Adams - K0BAM Delta County, Colorado DM68 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
What ever you do DO NOT TOUCH his TV in anyway. You are covered by FCC rules already. Tell him to call a TV repair service. check the ARRL web site. Been there done all this before.. John, W0JAB ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] ARISSat
Updated graphics of average height and fall rateof ARISSat: http://www.qsl.net/py4zbz/arissat.htm#r 73 de Roland PY4ZBZ ___ Sent via AMSAT-BB@amsat.org. 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
[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 -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Gordon JC Pearce Sent: Wednesday, December 07, 2011 3:02 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 2 Meter TV Interference On Tue, 6 Dec 2011 21:17:55 -0600 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. 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 ___ Sent via AMSAT-BB@amsat.org. 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@amsat.org. 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
[amsat-bb] Re: Two Meter TV Interference
>> ... 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@amsat.org. 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
[amsat-bb] New online logging site:AAR29/SAT
I'm posting below information just received from Eric/F4EJW regarding a new website, AAR29/SAT, he and Remy, F1NNI have put up to provide an online log sharing resource for each of the amateur satellites in service. To find it, go to Eric's blog link listed below, then click on the Amateur Radio Satellite AAR29 banner. 73 Nick KB1RVT Hello, The special site satellites is opened you will so find information miscellaneous as well as a live log for the recording of the contacts on the diverse amateur Radio satellites. Good traffic has all and has all. 73 Qro ERIC F4EJW and F1NNI REMY click here http://f4ejw.over-blog.com/ ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
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@amsat.org. 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
[amsat-bb] Re: Two Meter TV Interference
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@amsat.org. 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@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
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@amsat.org. 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@amsat.org. 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
[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@500MHz. Are there places that still use vhf? Charles On Dec 7, 2011 1:38 PM, "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 > > The 13" is about 66% of a quarter wave at 2 meters. > > Done > > Bob, WB4APR > > -Original Message- > From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On > Behalf Of Gordon JC Pearce > Sent: Wednesday, December 07, 2011 3:02 AM > To: amsat-bb@amsat.org > Subject: [amsat-bb] Re: 2 Meter TV Interference > > On Tue, 6 Dec 2011 21:17:55 -0600 > 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. > > 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 > ___ > Sent via AMSAT-BB@amsat.org. 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@amsat.org. 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@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
On Wed, 07 Dec 2011 09:20:19 -0500 Glenn Little WB4UIV 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
On Wed, 7 Dec 2011 13:45:52 +0100 "i8cvs" 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
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" To: "Bob Bruninga" Cc: ; "Gordon JC Pearce" 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@500MHz. Are there places that still use vhf? Charles On Dec 7, 2011 1:38 PM, "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 The 13" is about 66% of a quarter wave at 2 meters. Done Bob, WB4APR -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Gordon JC Pearce Sent: Wednesday, December 07, 2011 3:02 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 2 Meter TV Interference On Tue, 6 Dec 2011 21:17:55 -0600 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. 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 ___ Sent via AMSAT-BB@amsat.org. 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@amsat.org. 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@amsat.org. 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@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
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@500MHz. 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_frequencies_and_digital_television 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] IC 910H Hints?
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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: IC 910H Hints?
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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
- Original Message - From: "Bob Bruninga" To: "'Gordon JC Pearce'" ; 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" To: 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 > ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
>> 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
> 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] FW: [radio_pack] FW: A Ham's Night Before Christmas - YouTube
Kevin KF7MYK From: e...@gbis.com To: radio_p...@lists.unr.edu 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
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 - "John Geiger" 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" > To: "Bob Bruninga" > Cc: ; "Gordon JC Pearce" > 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@500MHz. Are there places that still use vhf? > > > > Charles > > On Dec 7, 2011 1:38 PM, "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 > >> > >> The 13" is about 66% of a quarter wave at 2 meters. > >> > >> Done > >> > >> Bob, WB4APR > >> > >> -Original Message- > >> From: amsat-bb-boun...@amsat.org > [mailto:amsat-bb-boun...@amsat.org] On > >> Behalf Of Gordon JC Pearce > >> Sent: Wednesday, December 07, 2011 3:02 AM > >> To: amsat-bb@amsat.org > >> Subject: [amsat-bb] Re: 2 Meter TV Interference > >> > >> On Tue, 6 Dec 2011 21:17:55 -0600 > >> 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. > >> > >> 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 > >> ___ > >> Sent via AMSAT-BB@amsat.org. 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@amsat.org. 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@amsat.org. 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@amsat.org. 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 > Get Free Email with Video Mail & Video Chat! http://www.juno.com/freeemail?refcd=JUTAGOUT1FREM0210 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
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@500MHz. 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Voyager 1 Near Edge Of Solar System
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@amsat.org. 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
[amsat-bb] LARES To Test Einstein's Theory
http://spaceflightnow.com/vega/vv01/111207lares/ 73s Bernhard VA6BMJ @ DO33FL ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
I have one still on RF channel 3 (KDLO). West of me is one on RF channel 2 (KOTA). 73, Joe kk0sd -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Charles Suprin Sent: Wednesday, December 07, 2011 3:49 PM To: Bob Bruninga Cc: amsat-bb@amsat.org; Gordon JC Pearce 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@500MHz. Are there places that still use vhf? Charles On Dec 7, 2011 1:38 PM, "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 > > The 13" is about 66% of a quarter wave at 2 meters. > > Done > > Bob, WB4APR > > -Original Message- > From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On > Behalf Of Gordon JC Pearce > Sent: Wednesday, December 07, 2011 3:02 AM > To: amsat-bb@amsat.org > Subject: [amsat-bb] Re: 2 Meter TV Interference > > On Tue, 6 Dec 2011 21:17:55 -0600 > 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. > > 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 > ___ > Sent via AMSAT-BB@amsat.org. 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@amsat.org. 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@amsat.org. 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@amsat.org. 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
[amsat-bb] Re: FW: [radio_pack] FW: A Ham's Night Before Christmas - YouTube
*Hello Kevin,* *The link is not working :( * * * *73,Riri OD5RI * On Thu, Dec 8, 2011 at 2:22 AM, Kevin Deane wrote: > > > > Kevin > KF7MYK > > > > > > > From: e...@gbis.com > To: radio_p...@lists.unr.edu > 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 > ___ > Sent via AMSAT-BB@amsat.org. 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 > -- * * * * * * * * * * * * * * * * * * * * * * * * * * *Riri - OD5RI / HE9RIR* IARU Region 1 IPHA Coordinator IPHA - Information Programme for Handicapped Radio Amateurs* * * * ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: 2 Meter TV Interference
Charles, Our Channels 8 & 10 moved the digital channel from UHF to VHF at the end of the conversion period. Since they had to give up one channel and the operating costs for the same coverage are considerably less on VHF it was a easy decision to make. I doubt this is what FCC had in mind, but that is how it worked out. UHF has less noise (Very little galactic noise) and significantly smaller antennas,(shorter wavelength) making the UHF segment more desirable for portable operations. Best policy is to use the VHF band for TV and save UHF for other uses. Interesting enough a 5 Watt "S" Band link transmitter carries the video signal to the local cable TV companies that serve 90% of the viewers. Only 10% receive their TV signals over the air! That is how it is done in Southern California. 73, Art KC6UQH -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Charles Suprin Sent: Wednesday, December 07, 2011 1:49 PM To: Bob Bruninga Cc: amsat-bb@amsat.org; Gordon JC Pearce 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@500MHz. Are there places that still use vhf? Charles On Dec 7, 2011 1:38 PM, "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 > > The 13" is about 66% of a quarter wave at 2 meters. > > Done > > Bob, WB4APR > > -Original Message- > From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On > Behalf Of Gordon JC Pearce > Sent: Wednesday, December 07, 2011 3:02 AM > To: amsat-bb@amsat.org > Subject: [amsat-bb] Re: 2 Meter TV Interference > > On Tue, 6 Dec 2011 21:17:55 -0600 > 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. > > 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 > ___ > Sent via AMSAT-BB@amsat.org. 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@amsat.org. 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@amsat.org. 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 __ Information from ESET NOD32 Antivirus, version of virus signature database 6689 (20111206) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 6689 (20111206) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 6692 (20111207) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
[amsat-bb] Re: 2 Meter TV Interference
Wyatt. Ernie has given you some good suggestions. It probably is the amplifier it self... But back in the day of analog TV a neighbor was having similar issues and I solved it by finding the power supply to his amp and doing some ferrite bead work with it..the signal was running up the power cord. Robert Oler WB5MZO Sent from my iPad On Dec 7, 2011, at 15:31, Ernie Howard wrote: > 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@amsat.org. 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@amsat.org. 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/mailma
[amsat-bb] Link to Holiday Ham Song
http://www.youtube.com/watch?v=c_9REVC4dtc hmm works for me thought it was pretty good. Kevin KF7MYK ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: LARES To Test Einstein's Theory
can't we squeeze a little bird in there? Bob W7LRD - Original Message - From: "B J" To: "amsat-bb" Sent: Wednesday, December 7, 2011 6:00:26 PM Subject: [amsat-bb] LARES To Test Einstein's Theory http://spaceflightnow.com/vega/vv01/111207lares/ 73s Bernhard VA6BMJ @ DO33FL ___ Sent via AMSAT-BB@amsat.org. 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@amsat.org. 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
