[Collins] SYNTHESIZER FOR DRAKE RECEIVER BY HAGEMAN

[Donald Sanders]

A very nice addition to the S-line receivers is available from Glen Zook. It
puts one or several, depending on model, crystal sockets available at a
switch position for adding and changing crystals to span several 200 KHz
segments don that position.
See: http://k9sth.com


Healthfully yours,
                          Don W4BWS
----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at ispwest.com>
To: <collins at mailman.qth.net>
Sent: Saturday, October 14, 2006 10:47 AM
Subject: Re: [Collins] SYNTHESIZER FOR DRAKE RECEIVER BY HAGEMAN


> On Sat, 2006-10-14 at 10:05 -0400, kiyoinc at attglobal.net wrote:
> > I was mulling this over:
> >
> > > SYNTHESIZER FOR DRAKE RECEIVER BY HAGEMAN (MINI KIT)
> > >
> > > QST Jun04
> > >
> > > Description: This project allows the R4 receiver to tune a 0.5 MHZ
> > > frequency range from 1.5 to 30 MHz with an LCD display. The mini kit
> > > consists of the programmed PIC, PC Board, (2) 7805 regulators, the
> > > MC145170d2 IC, op27gz opamp IC, and Mini Circuit 100 MHz VCO. The
> > > mini kit includes all the hard to get parts. Please specify the R-4
> > > OR SPR-4.. See www.arrl.org/files/sqtbinaries/drake_synth_zip
> >
> >
> > From: http://www.farcircuits.net/vfo2.htm#6vfo
> >
> > Seems to me that a similar synthesizer but programmed for 200 kHz steps,
> > and the Collins PTO offset/IF, would turn an S-Line into a fully agile,
> > all-band rig.  Kinda like a 51S-1.
> >
> > I've been looking for a complete kit of parts but haven't found one.
> >
> > de ah6gi/4
> >
> While its not as convenient for band scanning, the S-line with an easily
> accessed crystal socket and a crystal pack works that way, quite well.
>
> The synthesizer tends to have a lot more phase noise than the crystal
> oscillator and so degrades receiver performance when strong signals are
> near the desired weak signals.
>
> There has been a commercial synthesizer for S-line. Cost last I recall
> was on the order of $750. Its not as simple as the one for the Drake
> because Collins crystal frequencies all end in 55 KHz where the drakes
> end in 00 KHz.
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
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