[Swan] Swan RIT

[Darrel Nichols]

Problem with adding RIT to Swan gear (besides ruining whatever value),
is the single conversion scheme.   The network would have to be placed
in the VFO and it will not tune the same on every band.   Some method
of compensating the tuning between bands would get very complicated
and would add drift  (oh no! not that!).   The 508 would work to solve
the problem.   When I operate the 350 and try to net with a group of
buddies, I tell them what I'm on and it's up to them to try and keep up!

N0DBX


> [Original Message]
> From: David & Chris Drake <drakes at psci.net>
> To: <swan at mailman.qth.net>
> Date: 2/5/2005 7:58:24 AM
> Subject: [Swan] Re: Swan Digest, Vol 8, Issue 2
>
> Regarding RIT, the best thing to do is find a good 600 receiver, or an
> outboard VFO like a 508.  That way you don't modify the original radio.
> Best wishes, David Drake
> ----- Original Message ----- 
> From: <swan-request at mailman.qth.net>
> To: <swan at mailman.qth.net>
> Sent: Saturday, February 05, 2005 1:01 AM
> Subject: Swan Digest, Vol 8, Issue 2
>
>
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> > Today's Topics:
> >
> >    1. Re: RIT and the 270 (Mark Shaum)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Fri, 4 Feb 2005 08:26:21 -0600
> > From: "Mark Shaum" <k9tr at dtnspeed.net>
> > Subject: [Swan] Re: RIT and the 270
> > To: <swan at mailman.qth.net>
> > Message-ID: <034401c50ac5$7feb76a0$0200a8c0 at ahome.net>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > > From: "KEN CUBILO" <kencubilo at verizon.net>
> > > Subject: [Swan] adding rit control to cygnet 270
> > >
> > > Has anyone added rit control to their rigs? I would like to add it to
> > my
> > > cygnet 270. Correct me if I am wrong but could I not vary the
> > capacitance of
> > > c1501 in the carrier osc circuit and get rit on cw that way?
> > >
> > > Ken W8WLC
> >
> > Switching the carrier osc frequency a bit between xmt and rcv may help
> > bring actual transmitted and received frequencies closer together (the
> > tx should be offset by whatever tone you prefer to listen to and/or the
> > sidetone frequency) if your situation is that your cw replies to
> > stations are off frequency, but it wont provide true RIT.
> >
> > To provide RIT, a method to vary the vfo frequency only when in receive
> > mode is needed.  Most rigs of this era used a variable voltage across a
> > diode (acting like a variable capacitor) tapped into the vfo tank
> > circuit at some appropriate spot that would be adjustable in receive
> > mode for plus/minus a couple khz.
> >
> > Swan, Heath, Collins, all seemed to shy away from RIT circuitry until
> > the mid-70's or later.  Not having it is an irritation in SSB round
> > tables as well as CW.  I added RIT to my SB-101 decades ago by
> > "borrowing" the LSB/USB (or maybe the RTTY input, I forget) offset
> > voltage point on the LMO to use as a RIT voltage input.  Dial
> > calibration shifted on one sideband as a result, but having RIT on CW in
> > return was an acceptable tradeoff to me.
> >
> > 73!  Mark K9TR
> >
> >
> >
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> > End of Swan Digest, Vol 8, Issue 2
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