[Hammarlund] HQ-129-X Question

[Carl]

Thats a good possibility but it would also affect GC which is where its 
aligned.

The BS cap could be out of alignment, it has to be exactly centered. Both my 
129's are almost spot on accurate for any band but I dont crowd the band 
edges much without using the Meissner Signal Calibrator.

Carl
KM1H


----- Original Message ----- 
From: "D C *Mac* Macdonald" <k2gkk at hotmail.com>
To: <1oldlens1 at ix.netcom.com>
Cc: "Hammarlund Mail List" <hammarlund at mailman.qth.net>
Sent: Thursday, November 25, 2010 2:33 PM
Subject: Re: [Hammarlund] HQ-129-X Question


>
> Local oscillattor running on the wrong side of the incoming
> signal? If so, I'd bet that could REALLY screw up calibration.
>
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * Oklahoma City, OK *
> * USAF, Ret (61-81) *
> * * * * * * * * * * *
>
>
>
>
>> From: 1oldlens1 at ix.netcom.com
>> To: hammarlund at mailman.qth.net
>> Date: Thu, 25 Nov 2010 11:19:13 -0800
>> Subject: [Hammarlund] HQ-129-X Question
>>
>> I've finished tuning up my HQ-129-X. I find the
>> calibration of the band spread is just awful especially for
>> 80 and 40 meters. The error becomes progressively larger as
>> I tune from the "set" point downward. I wonder if this is
>> normal for these RX or not. The capacitor sections look OK,
>> no bending and the rotor blades appear to be centered in the
>> stator OK. I am tuning as directed, that is the set point is
>> at the high end of the band with the Band Spread set at the
>> highest frequency using a marker.
>> Main tuning calibration is fairly good although there
>> is some error at the high end. Again, the tuning cap
>> sections appear to be mechanically normal. The main dial
>> errors are acceptable, perhaps that way originaly or from
>> drift in the fixed padding caps in the oscillator circuit. I
>> would be surprized if the band spread error was normal.
>> I also get some hum on the carrier, noticable on CW on
>> the highest bands only. Perhaps a weak bypass cap in the
>> oscillator or a little heater to cathode leak in the 6K8.
>> The latter tests good but I will probaby get a couple of new
>> ones and see if they make any difference. The hum does not
>> appear to be coming from the power supply.
>> Another minor problem: the crystal filter phasing
>> adjustment wants to center at about 4 on its dial rather
>> than at the pointer. I moved the "gimmick" capacitor around
>> to minimise this but it still doesn't quite center. Perhaps
>> the crystal has drifted. Otherwise the filter seems to work
>> perfectly.
>> The RX is surprizingly stable after a reasonable
>> warm-up and does quite well for 20 meter SSB.
>> BTW, I bought a speaker some time ago at an antique
>> radio sale which appears to be the matching speaker for this
>> receiver. 10" Jensen in a rounded corner case, finish is
>> close although not quite identical, and grill is similar to
>> the illustrations of the original. I understand that there
>> were variations on the cane metal used for the grills. Also,
>> in illustrations there seems to be more contrast between the
>> panel and cabinet and trim gray than in my RX, again there
>> were probably variations. My RX has "Hammarlund" and the
>> type number in white, which I understand indicates a fairly
>> late model. I wonder if anyone has any serial number records
>> for the HQ-129-X.
>>
>>
>> --
>> Richard Knoppow
>> Los Angeles
>> WB6KBL
>> dickburk at ix.netcom.com
>>
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