[Milsurplus] AN/ARC-2A Available Soon- Dallas Area

[Jim Whartenby]

If the ARC-2 receiver section is indeed similar to the ARR-15 receiver then the RX passband can be narrowed by replacing the IF transformer coupling capacitors with a value considerably smaller then the stock values.  Don't have an ARC-2 manual and a search for a pdf version didn't find anything but rumor has it that the two receivers are related.
I have successfully narrowed the ARR-15 IF doing just this.  Haven't tried using gimmick capacitors but the capacitor values needed are 1pf or smaller so they are easily realized using gimmicks.  The formulas for calculating the IF bandwidth are found in the Radiotron Designers Handbook, 4th Edition.  If there is interest, I can find the chapter and verse.Jim

      From: Kenneth G. Gordon <kgordon2006 at frontier.com>
 To: ARC-5 <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net; David Stinson <arc5 at ix.netcom.com> 
 Sent: Monday, April 30, 2018 10:41 AM
 Subject: Re: [Milsurplus] [ARC5] AN/ARC-2A Available Soon- Dallas Area
   
On 30 Apr 2018 at 6:36, David Stinson wrote:

> I have a Collins AN/ARC-2A which will be available
> soon in the Dallas area.  It is complete/original
> with dynamotor.  I have tested it.  Receives and
> transmits nicely-modulated AM 35+ W out on 80 and
> 40 (using series 100pFd in antenna feed) with
> well-regulated 27V A+.  I am still cleaning
> switches, lubing etc.  Will have a more complete
> report later.  Just wonder if anyone within a
> reasonable distance around Dallas might be
> interested; I'm resistant to the idea of trying to
> ship the heavy beast.
> 
> 73 OM DE Dave AB5S

Good on ya, David. I've always thought the ARC-2 was a very interesting and useful rig, 
despite its lack of selectivity.

And yes it IS "rather large". ;-)

I understand that many (most?) were used in transport aircraft like the C-47.

Ken W7EKB

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