[ARC5] Waking up Command Receivers

[J Mcvey]

 I cut 'em, gut 'em, install metal film caps, then solder the pot back together, Looks like it never happened when I'm done.
Other guys put a terminal strip in that spot, others remove the wires and solder the cap to the wire's destination..
All of the above will work, but I like the aesthetics of the original design. 

    On Monday, July 5, 2021, 11:53:33 AM EDT, Mark K3MSB <mark.k3msb at gmail.com> wrote:  
 
 I never repot the caps.  I just replace them with individual capacitors.    Recapping the SCR-274N receivers is straightforward and takes just a few hours time (if you're slow like me.....).


On Mon, Jul 5, 2021 at 11:49 AM J Mcvey <ac2eu at yahoo.com> wrote:

 
Yes the caps tend to be very leaky. The big ones on the power lines will go dead short all of sudden- even after the radio has been on a while!
If you intend to use the radio, definitely consider re-potting all of the caps. The performance will probably improve also.I use a pipe cutter to make a clean cut, but a hack saw will work too... 

I've has less problems with the resistors, but that may depend on how the radio was stored.
    On Monday, July 5, 2021, 11:27:34 AM EDT, <gewhite at crosslink.net> wrote:  
 
 I have a couple of power supplies for the AN/ARC-5 and SCR-274N that plug into the dynamotor receptacle and  are powered by 110 volts AC. One was made by the lab at Aircraft Radio Corp and I made the other myself. Reasonably neat construction. I want $50 each plus postage. - Gordon Eliot White, po box 129, Hardyville, VA 23070 804-695-4628




-------- Original Message --------
Subject: Re: [ARC5] Waking up Command Receivers
From: Mark K3MSB <mark.k3msb at gmail.com>
Date: Mon, July 05, 2021 5:48 am
To: 
Cc: ARC-5 <arc5 at mailman.qth.net>

Alternatively, you could just use a 28V dynamotor powered off of a 24 V supply  (or build a 28V linear supply as I did).  28V Supplies are pretty cheap on Amazon (just be sure to bypass the output lines as these are switching supplies).

In Feb 2020, using a stock BC-453B,  I logged 68 NDBs during a weekend listening sprint with the receiver connected to my 160M INV-L antenna.
73 Mark K3MSB


 
On Sat, Jul 3, 2021 at 11:19 AM Al Klase <ark at ar88.net> wrote:

  Gang,
 
 We all have these things languishing in our collections.  Here's how to use one without building up a complete system.
 http://www.skywaves.ar88.net/homebrew/ARC-5_PS/ARC-5_PS.html
 Let me know if you have comments or corrections.
 
 73,
 Al
  -- 
Al Klase - N3FRQ
Jersey City, NJ
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