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

[Geoff]

I started on 30M right at the beginning also; using the Meissner VFO for the 
US Army WW2 150B transmitter.
The outboard VFO was a variant of the 1939 Signal Shifter, runs 5W from a 
6L6, and came with a full set of plug in coils.

For the past 12 years or so it is paired with a 1934 National FB-XA as my 
vintage 160-17M QRP station of choice.

Carl


----- Original Message ----- 
From: "Robert Rode" <midnitetoaker58 at gmail.com>
To: "David Stinson" <arc5 at ix.netcom.com>
Cc: "ARC-5" <arc5 at mailman.qth.net>
Sent: Monday, March 24, 2014 11:48 PM
Subject: Re: [ARC5] "Re-Banding" SCR-274N


> ...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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