Re: [amsat-bb] power supply for the down conv.

[Art Goldman <aegoldm@xxxxxxxxxxxx>]

Greg:

I found a "wall-wart" transformer that put out 18V. Actually, the unloaded
output was about 22V. I built a bias T in a small box with an F connector input
and N output. That way there's no possibility of mixing up the connections.

I just finished checking the 3733 on an HP sig generator and spectrum analyzer.
On mine, with an input of 2401.330 Mhz, I got the output at 123.380 Mhz. Just
for a reference, at 2400.00 Ghz, the output is at 122.06. At 2401.0 Ghz it's at
123.05. Gain couldn't be determined because I was using the bolt-on dipole that
comes with it. When I get my N adapter, I can be more precise.

Art, N3OY

greg wrote:

> well i have found a power supply that should work fine for the TranSsytems
> down conv. i had a old dss rcvr that has a power supply in it that has 18.6
> volts on it so that is what i amgoing to try i had the down conv. running in
> the shack with just a discone on it and after 30 min of operation the down
> conv. felt just warm to the touch i hope that is normal the power supply
> voltage with the load of the down conv. was around 16 volts
>
> GREG N8TDL
>
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--
 ---------
Art Goldman
Logicon Contractor
NSA Laboratory for Telecommunications Sciences
(301)688-1719


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