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Re: Re: Drake 2880 power



Thanks for taking up the ball on this.  I believe I used a MAR2 in my unit
only because it was left over from a GPS preamp I was building.  Since the
IF is in VHF, almost anything will work.  Cliff K7RR

On Wed, 31 Jan 2001, Frederick M. Spinner wrote:

> I'd recommend a good stable low-noise amp, like a MAR-6 for that 
> application.  About $2.00 last time I've checked.  My only concern is about 
> the comments on the mod pages about excessive gain out of the Drake.  So 
> maybe a 20 db pad (just resistors-- nothing fancy) and a MAR-6 is more 
> appropriate of a solution.
> 
> MMIC circuits typically consist of two coupling caps, a bias resistor, and a 
> RFC to supply power to the MMIC.  So in parts, with an "injector" you're 
> looking at about $10-$15 plus the box to put it in.
> 
> Now I'm still thinking an un-recrystaled Drake at 120 MHz mixed with
> a 70MHZ computer clock osc = a 50 MHz IF is a good idea, particularly for 
> those of us with FT-847s..  The mixer circuit could have a MMIC after the 
> mixer for similiar TX protection.
> 
> Fred W0FMS
> 
> 
> >From: Doug Faunt N6TQS +1-510-655-8604 <faunt@panix.com>
> >To: cbuttsch@slonet.org
> >CC: amsat-bb@AMSAT.Org
> >Subject: Re: [amsat-bb] Re: Drake 2880 power
> >Date: Wed, 31 Jan 2001 00:16:05 -0500 (EST)
> >
> >Can we have more details, like which MiniCircuits parts are
> >appropriate, and what to watch out for when putting this together?
> >73, doug
> >
> >
> >    Date: Tue, 30 Jan 2001 11:20:35 -0800 (PST)
> >    From: Clifford Buttschardt <cbuttsch@slonet.org>
> >    Cc: amsat-bb@AMSAT.Org
> >
> >    On Tue, 30 Jan 2001, Doug Faunt N6TQS +1-510-655-8604 wrote:
> >
> >    > As long as people are thinking about the bias Tee for power, perhaps
> >    > something could be added to that to provide protection from
> >    > transmitting into the converter: perhaps a sacraficial(sp?) cheap
> >    > unity gain, low-enough noise, amp?
> >    >
> >    > 73, doug
> >    >
> >
> >
> >    This is a very good idea!  I use a small Minicircuits block amplifier 
> >with
> >    fifty ohm in and out impedance just to accomplish this.  Cliff K7RR
> >
> >
> >----
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> 
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