[Boatanchors] Scott SLRM - Low BFO Injection

[David Stinson]

This Scott SLRM is very clean and nice.  Excellent build quality.
https://photos.app.goo.gl/yzGeeBsVnSBx5Uia6
https://photos.app.goo.gl/Xe46HyPpV68sMbAS7
Does anyone know what years this model was produced?  I know the earlier 
black one is WWII Navy.

This one had the "busted trimmer nut" problem in the LO of Band 3.
https://photos.app.goo.gl/wyX6W8dS8WY7QwpD6
Plastic inserts, as I've written of before, worked well.  Didn't even 
need to adjust it.

Those who have worked with the Scott SLRM receiver are probably aware of 
its low BFO injection.  In fairness, it's designed as an "entertainment" 
receiver, not a "communications" receiver,  though "in a pinch" one can 
turn on the BFO, turn the RF gain down and receive CW with headphone 
volume.   That's unfortunate, because the SLRM IF is so well done that, 
with the BFO and IF carefully and properly aligned, you can "slice" LSB 
from USB well.

Here's a simple, non-destructive way to get more BFO injection:
Locate the BFO tube, X-107, near the front of the receiver. Solder a 
link of hook-up wire to pin 3 (orange here):
https://photos.app.goo.gl/UXn4JQCEhsScB4BD6

Run the hookup wire under the wires next to the chassis along the IF stages:
https://photos.app.goo.gl/KXhwXNRmUnwuULqy7

End the run (unconnected) just under IF transformer T-115:
https://photos.app.goo.gl/wmLrJXzE8RdkRqcC8Once installed, check the BFO 
adjustment T-116 Bottom, to make sure the BFO is still centered on 455 
KC.  Mine barely moved.  This should give you plenty of BFO injection.

For an "entertainment" receiver, it's impressive.  When the opportunity 
presents, will install a simple B+ regulator.

GL OM ES 73 DE Dave AB5S


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