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

[David C. Hallam]

Jim,

I have a HP 141T with 8553B RF and the 8443A tracking generator.

David
KW4DH

On 7/10/2013 10:08 AM, Jim Liles wrote:
> 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
>>
>>
>>
>>
>>
>>
>

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