[Hallicrafters] SX-100 MK2 Alignment

[Jim Liles]

Hi David:
Did you use a modulated signal?

Did you replace the capacitors on the bandwidth selection switch and if so 
did you use film caps.  If you used ceramic caps, replace them with film 
before you do any further alignment.

Kindest regards Jim K9AXN




-----Original Message----- 
From: David C. Hallam
Sent: Friday, June 14, 2013 3:37 PM
To: hallicrafters at mailman.qth.net ; Roger Shultz
Subject: [Hallicrafters] SX-100 MK2 Alignment

I have a question about step 5-3-2, alignment of the 1600 KHz oscillator
and 1650 KHz IF.  I think I have carefully followed the procedure in the
manual, but can not seem to get the IF peak centered in the pass band.
I have peaked and repeaked T1 and T2 as well readjusting the 1600 KHz
oscillator.  My adjustment was to turn the slug into the coil until the
crystal stopped oscillating, then back the slug out until it output
peaked.  When I reached the peak, I kept turning it out until the output
voltage as measured by a VTVM on the detector voltage dropped to 1/2 of
the peak voltage.  After than I peaked top and bottom of T! & T2.

The pass band center is about 1/3-2/3.  Have I done things correctly and
how important is pass band centering?

David
KW4DH

-- 
"I predict future happiness for Americans if they can prevent the government 
from wasting the labors of the people under the pretense of taking care of 
them."
Thomas Jefferson

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