[ARC5] "Re-Banding" SCR-274N

[Dennis Monticelli]

The best way to double is to move the secondary connections of the osc
transformer to drive the 1625's in push-push.  I've always wanted to try
that.

Dennis AE6C




On Tue, Mar 25, 2014 at 8:10 AM, Glen Zook <gzook at yahoo.com> wrote:

> Using a BC-457, and then doubling in the final amplifier, would give a
> 30-meter transmitter.  Remember, a lot of the old "Novice Class"
> transmitters doubled in the final to get to 10-meters and that worked
> pretty well.
>
> Glen, K9STH
>
>
> Website:  http://k9sth.com
>
>
>
> On Tuesday, March 25, 2014 10:00 AM, Robert Rode <
> midnitetoaker58 at gmail.com> wrote:
>
> ...Dave, just sayin', first day 30 meters came available , I heard a guy
> using an ARC-5,...have no idea what model, but I thot it was very cool  !
> Have fun hope to hear u there,..W9ESX/Robert..
>
>
> On Mon, Mar 24, 2014 at 7:13 AM, David Stinson <arc5 at ix.netcom.com> wrote:
>
> > At a recent estate sale, I picked-up some cosmetically rough
> > but otherwise complete and unhacked 274N transmitters-
> > a 457, a 458 and a 459.  Putting the 457 and 458 on their closest ham
> band
> > is a simple matter of re-tuning the MO and PA padders.
> > Worked well.  When I got to the 459, I decided to try something different
> > and moved it UP to 30 Meters
> > using the same procedure.
> >
> > Turns-out the 274N transmitter can work as well
> > at 10.1 MC as it does at 7.0 MC.  When installed in the rack per
> original,
> > there is quite a bit of chirp.
> > However, if run "stand-alone" by the "Boatanchor Bob" method- disconnect
> > the Antenna relay, roll the contact so the antenna is always connected,
> > adjust the Selector relay contacts so the PA cathodes
> > make before the Oscillator contact,
> > key the rig with the Selector relay-
> > there was very little chirp and the transmitter was stable on frequency.
> > I'm keeping this one on 10.1 MC for fun.
> >
> > 73 DE Dave AB5S
> >
> > ______________________________________________________________
> > ARC5 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/arc5
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:ARC5 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>