[TMC] FS: Refurbished GPR-90

[James M. Walker]

Ola Mac,
A few comments from YOUR to do list---->

HARRIS: Gates BC1G 250/1000 Watt AM Transmitter. Fern listed this for sale
on the CCA 20 Meter Sunday Net. Bill N6PY tells me this is a near term
project, thus should not be difficult to operate on 160 meters. We will see.

I refurbed two of these, a while back, mostly takes patience, and a
good scrounging ability to get replacement caps if they haven't already
been swapped out, to get rid of the PCB types.

HARRIS: RF-130 with RF-1310A Exciter, I'd give this a " difficult" rating,
several unresolved issues.

Ah, yes but not too difficult I think if you know someone that
worked on the design team, at Harris R.F. Communications. Hint!

HARRIS: RF-601 Antenna tuner, the 37 conductor control needs the MS
connector installed. Oh !! This close space soldering takes my full patient
time and coolness, I really hate burning any adjoining wires.

If you think that is difficult, try doing it on an antenna mast, at sea
headed to Guam, through 20 foot seas and rain.
Hint: first get a lady with small hands, show her soldering techniques
then promise her anything, if she will do this small favor, explain that
most "Women" can't do it, Duck, Apologize, plead, offer money, or
a night on the town. I found that even with my abilities, the ladies at
Harris in Production did this job BEST!

73
Jim
WB2FCN
Former WB2PSI operator user in Ra Cha Cha.

----- Original Message -----
From: "Mac McCullough" <w5mc at austin.rr.com>
To: "John Poulton" <jp at cs.unc.edu>; <TMC at mailman.qth.net>
Sent: Wednesday, November 09, 2005 9:40 AM
Subject: Re: [TMC] FS: Refurbished GPR-90


> Superior effort, very nice ...  very ...
>
>
>
> Located 46 miles due North of the Alamo, and 121 miles due South of the
> Western White House.   see my website at  www.collinsandharrisradios.com
> ----- Original Message -----
> From: "John Poulton" <jp at cs.unc.edu>
> To: <TMC at mailman.qth.net>
> Sent: Wednesday, November 09, 2005 8:37 AM
> Subject: [TMC] FS: Refurbished GPR-90
>
>
> > Thanks for the confirmation that it's ok, even encouraged,
> > to place FS's on the list!  So, here goes...
> >
> > I have a very nice GPR-90 for sale, Canadian manufacture,
> > s/n 3092.  Here's its situation:
> >
> > Bought the radio at a hamfest, and it was in saaaad shape.
> > A replacement power transformer had been bodged onto the
> > chassis, the BFO coil was AWOL, rusty case, dirty..  Over the
> > course of a couple of months I went through the radio pretty
> > thoroughly, wound a new BFO coil (got to use my Morris Coil
> > Winder in anger!), wrote up a spec for the transformer and
> > commissioned its construction at Peter Dahl, did a complete
> > alignment, including resoldering those nasty ground busbars
> > in the RF section, had the case powder coated, replaced caps,
> > tubes, etc, etc.
> >
> > Anyhow, the radio now looks very, very nice, maybe a 9/10, and
> > it hears very well indeed, meeting or exceeding sensitivity specs.
> >
> > To summarize:
> >
> > * Powder-coated case
> > * New Peter Dahl power transformer
> > * Rewound BFO coil
> > * Recapped (all papers and small electrolytics) and retubed
> > * Filter cap reformed (< 50uA at 450V, each section)
> > * Mechanicals completely dissassembled, cleaned and lubed
> > * Complete alignment
> > * Includes a manual copy
> >
> > The radio's been tested fairly extensively, including operation
> > with an MSR.  Pictures at
> >
> > http://www.cs.unc.edu/~jp/pix/gpr90/
> >
> > I'd like $850 + shipping for the radio, which I think is fair given the
> > amount of effort expended on it.  I will ship, but would obviously
> > prefer pickup in Chapel Hill, NC.  If the radio gets shipped, the
> > new owner will probably have to realign the RF front end, given
> > the relative fragility of the circuitry.  For an additional $75
> > I'll construct a custom wooden crate for shipping.
> >
> > Let me know if you're interested.  If there are no queries from
> > the list in the next couple of days, I'll put it on EBAY.
> >
> > 73, John K4OZY
> >
> >
> >
> >
> >
> >
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