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

[Glen Zook]

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
>
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