[Milsurplus] Fwd: Re: SCR-522 Project: Three Down, Two to Go.

[Bruce Gentry]

-------- Forwarded Message --------
Subject: 	Re: [Milsurplus] SCR-522 Project: Three Down, Two to Go.
Date: 	Thu, 5 Jul 2018 13:20:53 -0400
From: 	Bruce Gentry <ka2ivy at verizon.net>
To: 	Mike Bracey <mikebracey at att.net>



Great work, best wishes for success. Is there any two meter AM activety 
in your area?  I have never been able to find a complete SCR-522 of my 
own to restore. Being able to find the cabinet and control box is the 
obstacle I have always run into. The receiver and transmitter modules 
are far  easier to find, although finding one that is complete and 
mechanically unaltered is difficult. Fifty years ago, SCR-522s modified 
to one frequency were common at small airfields, along with ARC-3s. 
However, the first step of converting them was to trash the 
multi-frequency mechanics. A surprising number of them were fully 
restored and installed in older, larger, private airplanes. They weren't 
kosher by the FCC, but for flying to small airfields without control 
towers, nobody cared.

      Bruce Gentry. KA2IVY


On 7/5/18 12:30 PM, Mike Bracey wrote:
> Hi Dave,
>
> I'm always interested in your projects. However, your video is so 
> dark, I can't see anything.
>
> Mike
> KE5YTV
>
>
> ------------------------------------------------------------------------
> *From:* David Stinson <arc5 at ix.netcom.com>
> *To:* ARC-5 <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net
> *Sent:* Thursday, July 5, 2018 8:01 AM
> *Subject:* [Milsurplus] SCR-522 Project: Three Down, Two to Go.
>
> (Not writing great details on this project because
> I don't think one other person on the planet is
> going to take this one on.  Just posting status
> for interested friends).
>
> Replacing caps and Hi-Z resistors in the Front End
> of the SCR-522 BC-624 receiver was challenging.
> Slow and steady, with lots of photos and drawings
> to get the thing back together.  15 minutes here,
> an hour there- took a few days, but patience was
> rewarded ;-)
> Listening to Dallas/Fort Worth Approach on 119.4
> MC:
> https://photos.app.goo.gl/Mrx6gVpT3aEYbGDt7
>
> Interesting:  The front end of the BC-624 RX is
> loaded with 680 pFd bypass caps. Tested all of
> those replaced using a ZM-11 bridge and found them
> all reading "good."  Nevertheless, the receiver
> plays now.  Of course, a lot of resistors were
> "off the reservation," but not by more than about
> 30% at worst. Probably not enough to make 15 dBm
> worth of difference.
>
> 1.  Dynamotor Supply (check).
> 2.  Mounting rack/electromechanicals (check).
> 3.  BC-624 Receiver Revival (check).
> 4.  BC-625 Transmitter Revival (next).
> 5.  System re-integration.
>
> GL OM ES 73 DE Dave AB5S
>
> "Telling the truth won't get you many friends.
> But it will get you the right ones."
>                 John Lennon
>
>
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