[Hallicrafters] Hallicrafters HT-32B ON THE AIR

[Paul Kraemer]

Jim, Lee, et al
I had one back in 65 and never had reports like that
If anything they felt it was too sharp
You may need to align that crystal filter
I did that and then got A#1 reports of nice audio
Alignment CAN be done with audio signal generator, s meter and patience
Of course, may have a bad xtal too.
Better start with audio proof using the audio generator
I don't have any notes on the rig or results.  Basically just rock the audio 
generator through the 300 to 3khz range, note how each adjustment affected 
what and worked for smooth even response monitoring s meter on the Drake 1A
Some old ads or tech review in QST would likely tell more about the filter.
I think the 32 to 37 downgrades were an economy measure.
Paul K0UYA

-----Original Message----- 
From: Jim Liles
Sent: Friday, February 20, 2015 10:23 AM
To: kc9cdt at aol.com ; hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] Hallicrafters HT-32B ON THE AIR

Hi Lee,

Check 7-16.3.  It indicates 650 cycles to 3000 cycles @3db --- say nothing 
about shape factor.  Describes how to adjust the center point as well.  Don’t 
know what the shape factor for the 9Mc filters was at the time.  Anyone know 
how many poles were in the filter

That begs a question.  Why did they change their strategy to phasing in the 
HT37 rather than crystal.  The phasing system has by design, broader skirts 
than crystal.  Maybe they had a problem with the 9 Mc filters of the day. 
Might be interesting th try a modern 9Mc crystal filter.

Anyone have internal correspondence with the Hal guys or design notes 
regarding the Ht-32B?

Kindest regards Jim K9AXN

-----Original Message----- 
From: Lee via Hallicrafters
Sent: Wednesday, February 18, 2015 7:07 PM
To: hallicrafters at mailman.qth.net
Subject: [Hallicrafters] Hallicrafters HT-32B ON THE AIR


Hi everyone,
Well, the Halli HT-32B is on the air. After many years of sleeping.
Changed the Electrolytics, 3 Black Beauty's. and the Bias diode (was 
selenium).
Also, someone before me had already SS the HV and B+.
Also had to adj. the carrier balance.

Working pretty darn good and WOW it is easy to tune-up.

One issue has surfaced...last night I was on 7139 LSB of course...and a guy 
came on and said I was 20 over on 7142 (above my freq)
I had several look at my signal and said it looked OK. But one had a Flex 
1500 and helped me out. He said I was about 5KC wide and my signal went away 
at 7141.5 and went away at 7135.5.

I turned the Mic gain down some (to 2.0) and he said it was a little better 
but still pretty wide.
Today I had a couple guys on 7131 check it out as well and 4 KC was the 
width....I do realize these old crystal filters did not have straight 
skirts.

What should be expected on this TX as far as bandwidth and interference to 
neighbors??
What has other experienced?
73,
Lee, KC9CDT



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