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Re: Drake power feed



That componet is a 0.56 microhenery choke, which is just about right for
DC isolation at the 315 MHz center IF of the Drake downconverter.  1000
pf is also OK, but a bit large for the coupling capacitor to the TV set.
Cliff K7RR


On Sun, 17 May 1998, Christopher R. Nighswonger wrote:

> Just to clarify further, the markings on the third component are a green
> stripe, blue stripe, gold stripe, and silver stripe.  The body of this
> component is a light brown, almost tan color.
> 
> 73's Chris ku4dd
> 
> 
> -----Original Message-----
> From: Jim Shorney <jshorn@binary.net>
> To: Christopher R. Nighswonger <ku4dd@nceye.net>
> Cc: amsat-bb@amsat.org <amsat-bb@AMSAT.org>
> Date: Sunday, May 17, 1998 10:29 AM
> Subject: Re: Drake power feed
> 
> 
> >-----BEGIN PGP SIGNED MESSAGE-----
> >
> >On Sat, 16 May 1998 23:49:43 -0400, Christopher R. Nighswonger wrote:
> >
> >>The pc board which feeds power onto the coax (in the power supply which
> came
> >>with my Drake unit) has on it one 5.6 ohm +/- 10% carbon resistor and two
> >>102 micro-farad ceramic caps.  No inductors.
> >
> >That doesn't sound right at all.  Not having seen one of these things,
> >I would geuss that the "5.6 ohm" is really a choke made in a carbon
> >resistor form factor.  5.6 Ohms would not be enough to isolate the RF
> >from the D.C.   The caps marked "102" are more than likely 1000 pF.
> >
> >
> >Jim Shorney




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