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Re: Downconverter power through coax questions



Allen,
I wuld suggest a 0.47 Microhenery choke and a 220 picofarrad capacitor to
couple the signal to the radio. The choke should be rated to handle 400 mA.
I would use a 0.0022 Microfarrad to bypass the DC end of the choke. The
capacitors should be disk ceramic type with a working voltage of 50 or more
volts. I think you will find that most converters use a 12 volt regulator
and in order to make it regulate it you-need to supply it with 15 volts. or
more. You can buy a low voltage dropout regulator that will work down to
12.1 volts, but you will have to install this as the other regulators are
less money and few converters have the low dropout units installed.

Art, KC6UQH

---- Original Message -----
From: "allen" <allen@cruzio.com>
To: <amsat-bb@amsat.org>
Sent: Wednesday, January 26, 2005 2:29 PM
Subject: [amsat-bb] Downconverter power through coax questions


> My 2.4GHz downconverter to 2M isn't working well.  I want to rebuild the
DC
> power insertion/extraction circuits to the coax.
>
>
>
>  What would be a good reactance for the coils?
>
>
>
>   Is there a preference on the capacitors?
>
>
>
>   I realize this is a simple circuit but, is there a reference circuit
> diagram somewhere?
>
>
>
>
>
> Thanks
>
> 73,
>
> Allen WB6RWU
> ----
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