[ARC5] SCR-274-N

[Mike Hanz]

I apologize for the delay...things are in moving chaos at the moment and 
I didn't notice that qth.net had somehow been blocked from my ISP back 
before Christmas.  I thought things were awful quiet...   :-)   Sending 
from the new address now and all seems well.  Looks like I missed a lot 
of good notes, from what I see on the web version.  Dave, that was an 
outstanding review of the command set issues - a real keeper!

Dave Stinson wrote:

>----- Original Message ----- 
>From: "Floyd Petri" <fpetri at eastex.net <http://mailman.qth.net/mailman/listinfo/arc5>>
>Subject: [ARC5] SCR-274-N
>
>>/I have obtained all the components for a SCR-274-N ...
>/
>Congratulations and best wishes for your new project, Floyd.
>Here's a few tips I've found in getting mine running:
>http://www.arrl.org/news/features/2006/06/17/1/21-lrg.jpg
>
>Spline shafts- get some for the sake of your collection,
>but do yourself a favor: don't install them if you plan to 
>operate the set.  Tune a receiver with one and you'll find
>out why the engineers designed them broad.
>  
>

Agree - though the shorter you can make the flex shaft the better.  I 
found that anything under a foot or so seems okay.  It's better to sneak 
up on a final frequency from the same direction every time - standard 
procedure when operating a lathe or milling machine as well.

>Mike Hanz has some excellent insights on a transmitter keying
>issue he and another gentleman studied last year, and he and
>others have great ideas on tuning and loading.
>Link, Mike?
>

That work was done by Steve Williams - I wuz just a kibbitzer.  Link is 
http://aafradio.org/docs/Relay_timing_issues_-_SCR-274N.html

Back to packing...

73,
Mike