Re: [amsat-bb] $6 Downconverter with 435 MHz IF

["Woody" <kj4so@xxxxxxxxx>]

Hi Allen:

Your calculations are correct.  A 7.6758 crystal will give you a LO 
frequency of 1965 MHz. and the downconverter will tune 2.4 GHz. with an IF 
frequency of 435 MHz.

I have not tried using a 435 MHz. IF with the $6 downconverter yet, but I 
have done this with the Drake downconverters as well as a couple of the AIDC 
downconverters and it worked well.  I believe that it will work with the $6 
downconverter, but it may require some "tweaking" of the LO's crystal 
oscillator.

I have some 7.6758 MHz. crystals (somewhere) that I had bought for use
in converting some AIDC downconverters.  Once I find them, I will replace 
the crystal in the $6 downconverter sometime in the next few weeks and will 
post
my test results as soon as I can.

73,

Woody
KJ4SO




----- Original Message ----- 
From: "KK4EMK" <kk4emk@bellsouth.net>
To: <amsat-bb@amsat.org>
Sent: Saturday, December 03, 2005 4:34 PM
Subject: [amsat-bb] $6 Downconverter with 435 MHz IF


> Has anyone modified the $6 Downconverter (CalAmp 130215) for use on the S
> band to work with a 435 MHz IF?
>
> Based on my humble calculations, it would require a 7.6758 MHz crystal. 
> Am
> I on the right track and should this work ok?
>
> Also, I would appreciate any suggestions on web sites that show how to 
> build
> S band antennas that would be suitable for handheld operations.
>
> Thanks for any help.
>
> Allen
> ----
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