[Hallicrafters] SX-111 Calibration?

[Bob Macklin]

Thanks,

I am thinking of centering the Dial Reset then adjusting the LO to the 
proper end point.

My initial tests showed the LO would start OK when the unit was turned on. 
But would quit when the band was changed.

Working inside the LO section of this thing is extremely difficult for me.

I'll know more later today.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
To: "Bob Macklin" <macklinbob at msn.com>; "Halicrafters" 
<Hallicrafters at mailman.qth.net>
Sent: Friday, July 13, 2012 10:06 AM
Subject: Re: [Hallicrafters] SX-111 Calibration?


>
> ----- Original Message ----- 
> From: "Bob Macklin" <macklinbob at msn.com>
> To: "Halicrafters" <Hallicrafters at mailman.qth.net>
> Sent: Friday, July 13, 2012 7:39 AM
> Subject: [Hallicrafters] SX-111 Calibration?
>
>
>>I received my SX-111 this week. The first problem was/is the LO does not 
>>start reliably. I installed a new 6C4 and that did not cure the problem. 
>>Then I cleaned the band switch the best I could. It's better but not 
>>perfect.
>>
>> Now My calibration question.
>>
>> There is a knob on the front panel for "Dial Reset". There is are no 
>> details in the manual about this control other than to use it to adjust 
>> the dial.
>>
>> This control seems to be an inductor similar to the BFO inductor in my 
>> SX-110.
>>
>> If I use this control to calibrate the dial on 80M the dial is off on all 
>> other bands.
>> There are no real instructions about precision tuning this receiver.
>>
>> I am thinking about using this control with the crystal calibrator to 
>> fine adjust all the LO coils at the low band edge on all bands. I would 
>> do this with the "Dial Reset" control centered.
>>
>> Is there any reason I should not do this.
>>
>> I could put my counter on the LO and adjust the band edge that way if 
>> necessary.
>>
>> Bob Macklin
>> K5MYJ
>> Seattle, Wa.
>> "Real Radios Glow In The Dark"
>
>     There are handbooks for both the SX-111 and the Mk I version at BAMA.
>     If the frequency calibration is way off its possible that its related 
> to the intermittent starting of the LO. I would look for bad caps or 
> drifted resistors around the LO. However, I would start by seeing if you 
> can align the oscillator.  The calibrator will work but a signal generator 
> may be better for aligning the RF because that should be done with a 
> relatively weak signal.  The pointer adjuster should be needed only to 
> correct small amounts of drift.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>