[amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink

[Jim Jerzycke]

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 at 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
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>> _________________________________________________________
>>
>>
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>
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