[Hallicrafters] Caps on Selectivity switch was: RE: SX-100 Knobs

[Jim Liles]

Hi again David:
What spectrum analyzer do you use.  The HP 8568B can be used for audio, it 
goes down to 200 cycles or you can go straight to the output of the I.F. 
system.  If you use the audio output simply use a diode noise generator or 
florescent bulb next to the antenna wire.  Set max hold and voila you have a 
good photo shoot.  Same goes for the I.F. test point.  If you have a sweeper 
use it.  The photos come out like the photos in the book.

Have fun with that radio!

Kindest regards Jim K9AXN

-----Original Message----- 
From: David C. Hallam
Sent: Wednesday, July 10, 2013 7:06 AM
To: Chris Kepus
Cc: hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] Caps on Selectivity switch was: RE: SX-100 
Knobs

Chris,

I aligned the 1600 KHz oscillator yesterday and got the signal centered
in the pass band to 500 Hz.  I hope that is close enough because I
intend to work on the 1700 KHz oscillator today.  I am thinking about
how to attenuate the signal enough so I can connect my spectrum analyzer
and actually see the pass band.

If the 1700 KHz goes as well as the the 1600 KHz alignment did, I might
even get the RF section aligned.

David
KW4DH

On 7/10/2013 1:02 AM, Chris Kepus wrote:
> David,
> Hopefully someone more experienced with the 1650 khz IF alignment process
> will step forward to mentor us on any "tricks of the trade".  Sounds like
> you were on track save for the difficulty getting the 1650 khz signal
> centered in the pass band. But that was before you changed out the caps 
> and
> resistors in the circuitry if I read your post correctly.  Hopefully you
> will get a break on the weather so you can find out if you can complete 
> the
> alignment with the new components in place.  OTOH,  can't say that I blame
> you for staying out of the garage! ;-)
> We'll stand by for you.
> 73,
> Chris
> W7JPG
>
>
>
>
>
>

-- 
"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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