[Hammarlund] SP-600 RF Deck

[Richard Knoppow]

----- Original Message ----- 
From: "k2cby" <k2cby at optonline.net>
To: <hammarlund at mailman.qth.net>
Sent: Tuesday, January 03, 2012 1:16 PM
Subject: [Hammarlund] SP-600 RF Deck

     I agree with all of this and sent much the same 
material off list. I think an old type soldering GUN may be 
more easily used for the ground straps, there really isn't 
much room and I found I had trouble with a large soldering 
iron. Hammarlund may have used irons with extra long tips on 
the line.
     I also suggested inspecting the tuning cap carefully. 
I've found more than one where the stators were no longer 
centered on the rotor. They must be centered exactly and 
aligned vertically in order for the sections to track. If 
they are not aligned correctly the frequency calibration and 
tracking will suffer. DO NOT BEND PLATES. Its not necessary 
and can't be undone. I have seen bent plates in a couple of 
receivers and there is a web site which recommends it. DON'T 
DO IT.
     I have method of aligning the dial plates and pointer. 
The pointer should run exactly vertically along the dial. 
Take the dial and put some transparent tape like Scotch 
Magic Tape so that it covers the line from the referece line 
at the bottom near the low end of the broadcast band and 
extends to the edge of the dial. Then draw a line on it 
extending from this reference mark to the end of the box 
surrounding the logging numbers at the top. Now, with the 
tuning mechanism at the low end stop loosen the screws 
holding the clamp for the dial just enough to be able to 
slip the dial. Also, the pointer has two screws clamping it 
to the slider. Loosen these slightly. Now juggle the 
position of the dial and the pointer so that the pointer 
runs exactly on the line as it moves up and down. When you 
have that position tighten everything and make sure it works 
using the band switch. Now, when this has been done set the 
logging dial pointer so that it is at the marker and is 
verticle. The logging dial is now set so that the pointer is 
exactly parrallel to the marks on the dial, this requires a 
little juggling of dial position and the pointer. The main 
pointer, BTW, should be set in height so that it just comes 
up to the reference line for the band. The reason for the 
gunsight shape is to eliminate parallax, when you are at a 
marking on the dial the mark will appear to be an extension 
of the pointer. It can be reset with great precision.
     Enough for now.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com