[Swan] Re: Swan Digest, Vol 8, Issue 2

[David & Chris Drake]

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


> Send Swan mailing list submissions to
> swan at mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/swan
> or, via email, send a message with subject or body 'help' to
> swan-request at mailman.qth.net
>
> You can reach the person managing the list at
> swan-owner at mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Swan digest..."
>
>
> 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
>
>
>
> ------------------------------
>
> _______________________________________________
> Swan mailing list
> Swan at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/swan
>
>
> End of Swan Digest, Vol 8, Issue 2
> **********************************
>
>