Info needed "European 145 and 435 MHz Diplexer and Dual Band Filter (Model: DCI-145-435-DX-DB)"
Hi all One guy, is selling this filter, http://www.dci.ca/?Section=Products&SubSection=Amateur I am thinking in the possibility of using it for desensing problem with FO-29. I`m pretty sure it would work fine, but the question is, would it pass dc power for feeding the preamp? Somebody knows it? I asked them via email, but not answer. 73 Luis EC4TR
Hello Luis. If you put the filter between preamp and antenna then your preamp gets his DC power. I have done it here that way. I use a Diamond MX-72A filter and no more desensing here anymore.
https://twitter.com/ON4HF/status/660425903869206529
73, Eric.
Amateur radio station ON4HF Satellite manager UBA Member Amsat-NA #39595 Member Amsat-UK Member Amsat-ON
Op 5/01/2016 om 20:53 schreef EC4TR Luis:
Hi all One guy, is selling this filter, http://www.dci.ca/?Section=Products&SubSection=Amateur I am thinking in the possibility of using it for desensing problem with FO-29. I`m pretty sure it would work fine, but the question is, would it pass dc power for feeding the preamp? Somebody knows it? I asked them via email, but not answer. 73 Luis EC4TR _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Luis,
A cheaper diplexer would suffice. That looks like it has very strong out of band rejection, but for a simple desense problem. you don't need anything too fancy.
You would put the diplexer between the 70cm antenna and preamp, so there is no need to pass DC through the diplexer.
See here:
http://ww2.amsat.org/?page_id=2136
73,
Paul, N8HM
On Tue, Jan 5, 2016 at 2:53 PM, EC4TR Luis ec4tr.luis@gmail.com wrote:
Hi all One guy, is selling this filter, http://www.dci.ca/?Section=Products&SubSection=Amateur I am thinking in the possibility of using it for desensing problem with FO-29. I`m pretty sure it would work fine, but the question is, would it pass dc power for feeding the preamp? Somebody knows it? I asked them via email, but not answer. 73 Luis EC4TR _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
A common model used in the US to eliminate desense is the Comet CF-4160N. I'm not sure of its European availability but they are inexpensive enough a US dealer should be able to send it to you for reasonable shipping. I have sent DCV through mine to power preamps in the past.
73 Clayton W5PFG
On 1/5/2016 13:53, EC4TR Luis wrote:
Hi all One guy, is selling this filter, http://www.dci.ca/?Section=Products&SubSection=Amateur I am thinking in the possibility of using it for desensing problem with FO-29. I`m pretty sure it would work fine, but the question is, would it pass dc power for feeding the preamp? Somebody knows it? I asked them via email, but not answer. 73 Luis EC4TR _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
The cavity filter will not pass DC.
From: EC4TR Luis ec4tr.luis@gmail.com To: amsat-bb@amsat.org; satdx-bb@star-com.net Sent: Tuesday, January 5, 2016 1:53 PM Subject: [amsat-bb] Info needed "European 145 and 435 MHz Diplexer and Dual Band Filter (Model: DCI-145-435-DX-DB)"
Hi all One guy, is selling this filter, http://www.dci.ca/?Section=Products&SubSection=Amateur I am thinking in the possibility of using it for desensing problem with FO-29. I`m pretty sure it would work fine, but the question is, would it pass dc power for feeding the preamp? Somebody knows it? I asked them via email, but not answer. 73 Luis EC4TR _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Hello Luis
The best way is to put the filter BEFORE the signal goes into the preamp.There are plenty of "cheap" diplexers, but if i were you, just make it yourself. You only need 50% part of the diplexer,so in a small weatherproof box build your own filter for it. On my side i have no problem with desense, MASPRO WHS-32N on 2m boom 7m high. BUT all is well grounded here. I have also homemade crossyagis on the roof,at 12m high,but no pol.switching there; gonna change them into X-quads with pol.switch, because the Maspro is too big for my roof. For my /p antenne i made myself a diplexer, but going to split it into 2 smaller boxes, 1 per antenne, LPF and HPF seperated.
73's
Jerry,ON4CJQ
----- Oorspronkelijk bericht ----- Van: "EC4TR Luis" ec4tr.luis@gmail.com Aan: amsat-bb@amsat.org, satdx-bb@star-com.net Verzonden: Dinsdag 5 januari 2016 20:53:24 Onderwerp: [amsat-bb] Info needed "European 145 and 435 MHz Diplexer and Dual Band Filter (Model: DCI-145-435-DX-DB)"
Hi all One guy, is selling this filter, http://www.dci.ca/?Section=Products&SubSection=Amateur I am thinking in the possibility of using it for desensing problem with FO-29. I`m pretty sure it would work fine, but the question is, would it pass dc power for feeding the preamp? Somebody knows it? I asked them via email, but not answer. 73 Luis EC4TR _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Thank you very much to all. I see that the tips are unanimous regarding the use of a duplexer. So far I was reluctant to use it not to introduce lost, since I use my installation of VHF / UHF local contests I have a "D original" duplexer that does not use and I've tested at work with good results. I will not be very difficult to climb the tower and place it just before the preamp. I'll tell you that this was me. 73 Luis
2016-01-06 17:49 GMT+01:00 jerry.tuyls@telenet.be:
Hello Luis
The best way is to put the filter BEFORE the signal goes into the preamp.There are plenty of "cheap" diplexers, but if i were you, just make it yourself. You only need 50% part of the diplexer,so in a small weatherproof box build your own filter for it. On my side i have no problem with desense, MASPRO WHS-32N on 2m boom 7m high. BUT all is well grounded here. I have also homemade crossyagis on the roof,at 12m high,but no pol.switching there; gonna change them into X-quads with pol.switch, because the Maspro is too big for my roof. For my /p antenne i made myself a diplexer, but going to split it into 2 smaller boxes, 1 per antenne, LPF and HPF seperated.
73's
Jerry,ON4CJQ
----- Oorspronkelijk bericht ----- Van: "EC4TR Luis" ec4tr.luis@gmail.com Aan: amsat-bb@amsat.org, satdx-bb@star-com.net Verzonden: Dinsdag 5 januari 2016 20:53:24 Onderwerp: [amsat-bb] Info needed "European 145 and 435 MHz Diplexer and Dual Band Filter (Model: DCI-145-435-DX-DB)"
Hi all One guy, is selling this filter, http://www.dci.ca/?Section=Products&SubSection=Amateur I am thinking in the possibility of using it for desensing problem with FO-29. I`m pretty sure it would work fine, but the question is, would it pass dc power for feeding the preamp? Somebody knows it? I asked them via email, but not answer. 73 Luis EC4TR _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (6)
-
Clayton W5PFG -
Douglas Phelps -
EC4TR Luis -
Eric Knaps, ON4HF -
jerry.tuyls＠telenet.be -
Paul Stoetzer