[amsat-bb] Re: bias tee circuits and components for 2.4 GHzdownconverter

[George Henry]

Did you try a local TV repair shop?  Many times, I have been able to buy 
small parts like chokes from them, when Radio Shack didn't carry them...


----- Original Message ----- 
From: "Michael Tondee" <mat_62 at netcommander.com>
To: "amsat-bb" <amsat-bb at amsat.org>
Sent: Sunday, May 11, 2008 12:01 PM
Subject: [amsat-bb] bias tee circuits and components for 2.4 
GHzdownconverter


>I have a  Pacific Monolithics surplus MMDS downconverter here that I would 
>like to get up and running on S-band. It has an 122 MHz IF and I want to 
>whip up a bias -tee to power it. I've looked at the circuits in the 
>Satellite Experimeters handbook and my problem is finding an rf choke of 
>the right value that is readily available in my area. Shouldn't I be able 
>to just wind  something with an air core out of magnet wire or something 
>similar that will do the trick? According to the circuit I have I'd need 
>about a 1.5 uh choke for 146 Mhz and it isn't critical so that's probably 
>close enough for my downconverters IF frequency. I hate to spend shipping 
>charges to get one little choke or ferrite core for winding a choke on 
>here. Most places have a minimum order and I don't need anything else at 
>this time. I'd also welcome links to any other circuits that might be out 
>there.
> Thanks,
> Michael, W4HIJ