[Hallicrafters] SR-400 tracking problem

[james.liles]

Hi Sandy:
Congratulations, that is a fine radio.  Before you do anything, check 
whether it tracks with a dummy load and sig gen.  If it does, the antenna is 
probably really screwed up.  If it doesn't align it.  The radio must be 
aligned with a 50 ohm non-reactive load and the load left in place for 
receive adjustments.  The sig gen is attached to the 6Mc trap in front of 
the receive side and can be left in place for receive peaking.  The manual 
actually does address the alignment of tracking but doesn't call it that. 
The transmitter must first be set to track on the 10 meter band, end to end 
and transmit/receive as per the manual.  Then the other bands are set to 
transmit and peaked at the low end of the band --- then without changing 
anything go to receive and peak the receive coils.  Then verify that it will 
track to the high end, and if not, re-check the 10 meter tracking 
(Transmit/receive).  If the 10 meter adjustments are not right, no band will 
be correct.  Last question.  Is there any specific band that will not track? 
There was an engineering change that changed a slug which corrected an 80 
meter tracking problem.  Kindest regards Jim K9AXN


> Message: 1
> Date: Wed, 27 Jan 2010 15:00:18 -0500
> From: "Alexander N Gerli Sr" <ac1y at nc.rr.com>
> Subject: [Hallicrafters] SR-400A Preselector tracking problem
> To: <Hallicrafters at mailman.qth.net>
> Message-ID: <0819AA7B47504B0188AC5E880692231F at angxpdesktop>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi, gang!
>
> My SR-400A is working, but the Preselector doesn't track properly. Tx and 
> rx
> do NOT peak at the same setting, as I believe they should. I have my 
> Manual,
> but this subject isn't covered specifically in the Alignment procedures.
>
> The rig works fine except for this problem. PA tubes are balanced to less
> than 0.1Vdc - I checked that this morning just to be sure.
>
> Can someone help me out with this?
>
> 73,
>
> Sandy AC1Y
>
> Alexander N. (Sandy) Gerli, AC1Y/G5CPJ
> 4012 Bristol Road
> Durham, NC  27707-5403
> (919) 489-9638
> CCA #AC96-00001
>
> REAL radios glow in the dark!!!!