[amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink
Many thanks Drew for the suggestion. I will try it. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.com _ -Mensaje original- De: Andrew Glasbrenner [mailto:glasbren...@mindspring.com] Enviado el: domingo, 19 de enero de 2014 20:07 Para: Gabriel - EA6VQ; AMSAT-BB@amsat.org Asunto: Re: [amsat-bb] 145 MHz signal blocking 435 MHz downlink From the old AMSAT website...maybe I'll move it to the new one today: http://www.amsat.org/amsat-new/articles/Mode-J/ 73, Drew KO4MA -Original Message- From: Gabriel - EA6VQ ea...@dxmaps.com Sent: Jan 19, 2014 1:56 PM To: AMSAT-BB@amsat.org Subject: [amsat-bb] 145 MHz signal blocking 435 MHz downlink Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
Hi Greg. Most decent VHF transmitters will already have a pretty good LPF on the output to reduce the harmonics. However, receivers these days tend to be DC-Daylight, so frequently need a filter to prevent 'blocking' by unwanted high level signals. In that case preventing the VHF coming into the UHF receiver can be important Thanks David -Original Message- From: Greg D ko6th.g...@gmail.com To: Jim Jerzycke kq...@verizon.net; w4tas w4...@gte.net; 'AMSAT Mailing List' amsat-bb@amsat.org Sent: Mon, 20 Jan 2014 3:47 Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
Greg, I had a problem with 70cm jamming 2401 down link many years ago. The problem turned out to be corrosion between the coax connector shell and the aluminum antenna element. Cleaning up the connection solved the problem. The corrosion acts like a diode and will make enough 3 order products to trash any receiver. Use liquid electrical tape or non-corrosive (doesn't smell like vinegar) silicon seal to keep these connections dry and clean. Art, KC6UQH -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of g0...@aol.com Sent: Monday, January 20, 2014 1:23 AM To: ko6th.g...@gmail.com; kq...@verizon.net; w4...@gte.net; amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Hi Greg. Most decent VHF transmitters will already have a pretty good LPF on the output to reduce the harmonics. However, receivers these days tend to be DC-Daylight, so frequently need a filter to prevent 'blocking' by unwanted high level signals. In that case preventing the VHF coming into the UHF receiver can be important Thanks David -Original Message- From: Greg D ko6th.g...@gmail.com To: Jim Jerzycke kq...@verizon.net; w4tas w4...@gte.net; 'AMSAT Mailing List' amsat-bb@amsat.org Sent: Mon, 20 Jan 2014 3:47 Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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 ___ Sent via AMSAT-BB@amsat.org. Opinions expressed
[amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink
Vince, Just for fun I swept the mode-J filter with an analyzer. The isolation was good enough that it didn't matter with the 2 meter side was terminated or not. 73s, Alan WA4SCA -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Vince Fiscus, KB7ADL Sent: Monday, January 20, 2014 4:06 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink At 07:09 PM 1/19/2014 +, Jim Jerzycke kq...@verizon.net wrote: Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA One thing I've always wondered about this is, would one what to put a 50 ohm non inductive resister on the 2M output of the diplexer? or shouldn't that make much difference. KB7ADL ___ 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: 145 MHz signal blocking 435 MHz downlink
The original article said it didn't matter, but I put a 50 Ohm load on mine just on General Principles. I HATE seeing a port like that unterminated! 73, Jim KQ6EA On 01/20/2014 10:06 PM, Vince Fiscus, KB7ADL wrote: At 07:09 PM 1/19/2014 +, Jim Jerzycke kq...@verizon.net wrote: Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA One thing I've always wondered about this is, would one what to put a 50 ohm non inductive resister on the 2M output of the diplexer? or shouldn't that make much difference. KB7ADL ___ 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: 145 MHz signal blocking 435 MHz downlink
Hi Art, Yep, corrosion is a great source for harmonics. I had a similar problem with AO-40, only mine turned out to be the relay contacts on the 70cm antenna's RHCP / LHCP relay. Cycle them a few times and things quieted down. But I only heard the problem when I was aimed at the big oak tree behind our house, which was odd because the 70cm transmit antenna was literally a few inches away from the edge of the 2.4 ghz receive dish. Never heard of a tree acting as a diode before. Maybe the squirrels were up to something... Greg KO6TH kc6...@cox.net wrote: Greg, I had a problem with 70cm jamming 2401 down link many years ago. The problem turned out to be corrosion between the coax connector shell and the aluminum antenna element. Cleaning up the connection solved the problem. The corrosion acts like a diode and will make enough 3 order products to trash any receiver. Use liquid electrical tape or non-corrosive (doesn't smell like vinegar) silicon seal to keep these connections dry and clean. Art, KC6UQH -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of g0...@aol.com Sent: Monday, January 20, 2014 1:23 AM To: ko6th.g...@gmail.com; kq...@verizon.net; w4...@gte.net; amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Hi Greg. Most decent VHF transmitters will already have a pretty good LPF on the output to reduce the harmonics. However, receivers these days tend to be DC-Daylight, so frequently need a filter to prevent 'blocking' by unwanted high level signals. In that case preventing the VHF coming into the UHF receiver can be important Thanks David -Original Message- From: Greg D ko6th.g...@gmail.com To: Jim Jerzycke kq...@verizon.net; w4tas w4...@gte.net; 'AMSAT Mailing List' amsat-bb@amsat.org Sent: Mon, 20 Jan 2014 3:47 Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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
[amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink
From the old AMSAT website...maybe I'll move it to the new one today: http://www.amsat.org/amsat-new/articles/Mode-J/ 73, Drew KO4MA -Original Message- From: Gabriel - EA6VQ ea...@dxmaps.com Sent: Jan 19, 2014 1:56 PM To: AMSAT-BB@amsat.org Subject: [amsat-bb] 145 MHz signal blocking 435 MHz downlink Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
Hi, Paul I use that antenna as my Field Day antenna, as it's much easier to transport. At home I use an M2 2M7 and a 420-450-11 with SSB preamps. 73, Jim KQ6EA On 01/19/2014 11:21 PM, Paul wrote: Hello Jim, Do you still use the GulfAlpha 'Easy Sat' antenna? I'm looking for any advice on improving performance. I have already installed the diplexer as shown in the article below but it seems I'm getting no good signal on the 70cm uplink. Paul Delaney - K6HR http://k6hr.dyndns.org:8080 -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Jim Jerzycke Sent: Sunday, January 19, 2014 11:09 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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 --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.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: 145 MHz signal blocking 435 MHz downlink
I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
Hello Jim, Do you still use the GulfAlpha 'Easy Sat' antenna? I'm looking for any advice on improving performance. I have already installed the diplexer as shown in the article below but it seems I'm getting no good signal on the 70cm uplink. Paul Delaney - K6HR http://k6hr.dyndns.org:8080 -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Jim Jerzycke Sent: Sunday, January 19, 2014 11:09 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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 --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.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: 145 MHz signal blocking 435 MHz downlink
Since I use a very good 2 Meter bandpass filter on my 2 Meter output, I use the diplexer AT the antenna, ahead of the preamp. Jim KQ6EA On 01/20/2014 03:41 AM, Greg D wrote: I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
The more I read about it, the more I expect that the right answer depends on one's particular receive-side hardware. If it's already got good out of band filtering, then the hi-pass filter offered by the posted diagram won't help, since it's aimed at reducing the 2m fundamental overload. For that, you need to use the 2m port on the Tx side (Tx to Common, 2m port to antenna, leaving the 70cm port unconnected). On the other hand, if the receiver pretty wide open, then the 2m fundamental is the main problem, and the posted receive-side design will eliminate it before it hits the receive chain. Yes? Greg KO6TH Jim Jerzycke wrote: Since I use a very good 2 Meter bandpass filter on my 2 Meter output, I use the diplexer AT the antenna, ahead of the preamp. Jim KQ6EA On 01/20/2014 03:41 AM, Greg D wrote: I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
Well, from my experience, every little bit helps. I first had the two antennas mounted horizontally on the cross boom, and had some interference/desense. Then I installed the diplexer, and it lessened. Then I put the 2 Meter bandpass filter on the transmitter, and it improved some more. Then I mounted the two antennas at 45* to the boom, making them 90* to each other, and it went down some more. Short of hanging huge cavity filters on the antenna, and using a 20' cross boom, I don't think there's much more I could do! 73, Jim On 01/20/2014 04:54 AM, Greg D wrote: The more I read about it, the more I expect that the right answer depends on one's particular receive-side hardware. If it's already got good out of band filtering, then the hi-pass filter offered by the posted diagram won't help, since it's aimed at reducing the 2m fundamental overload. For that, you need to use the 2m port on the Tx side (Tx to Common, 2m port to antenna, leaving the 70cm port unconnected). On the other hand, if the receiver pretty wide open, then the 2m fundamental is the main problem, and the posted receive-side design will eliminate it before it hits the receive chain. Yes? Greg KO6TH Jim Jerzycke wrote: Since I use a very good 2 Meter bandpass filter on my 2 Meter output, I use the diplexer AT the antenna, ahead of the preamp. Jim KQ6EA On 01/20/2014 03:41 AM, Greg D wrote: I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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: 145 MHz signal blocking 435 MHz downlink
To All, Solid State transmitters have white noise generated due to the changing I/O reactance as a function of the junction voltage of FET/BJT devices. Since both transmitters have low pass filters for harmonic suppression that also reduce white noise above the transmit frequency the Diplexer is most effective on the 70 cm side preventing white noise from blocking the 2M receiver. BTW Tubes do not have white noise. Art, KC6UQH -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Greg D Sent: Sunday, January 19, 2014 7:42 PM To: Jim Jerzycke; w4tas; 'AMSAT Mailing List' Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink I know this has been answered before, but I forget. Given one Diplexer, is it better to put it on the Tx side to limit the 3rd harmionic going out, or better on the Rx side to limit the VHF fundamental coming in? Tony's diagram shows the later; I would have thought the former would be more effective (hitting the problem at its source). Greg KO6TH Jim Jerzycke wrote: Yep, been using one of those for years! I have a Sinclair Labs unit that provides 100dB rejection outside of the 2 Meter band. Jim KQ6EA On 01/19/2014 07:32 PM, w4tas wrote: I would also suggest a low pass filter on the two meter transmitter. A diplexer will work well for this also. This will reduce the third harmonic which is causing your problem. Good luck, -Original Message- From: Jim Jerzycke Sent: Sunday, January 19, 2014 2:09 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink Buy a diplexer, and connect it as shown in the linked article: http://www.amsat.org/amsat-new/articles/Mode-J/ I also tilt both of my Yagis so they're 45* to the boom, which makes them 90* to each other. Yes, I lose some signal on terrestrial use, but ti helped cut the coupling, and desense, down quite a bit. 73, Jim KQ6EA On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote: Hi all, I have a coupling problem in my station when trying to work FO-29. My 2m signal is completely blocking the 435 MHz downlink, and so I can't hear my signal off the satellite. I guess it must be something related to the distance between the two yagis. (I use the terrestrial horizontal yagis you can see at http://www.dxmaps.com/jm19hn.html ). With mode-B satellites there is no problem. I have tried it with two different 435 receivers, and it's exactly the same. Anyone has had this problem o have an idea of the possible reason? And what is more important, of some way to solve it? Thanks for any possible help. 73. Gabriel - EA6VQ _ Web-Site: HTTP://www.dxmaps.com VQLog 3.1 (build 78): HTTP://www.vqlog.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 ___ 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
