[Hammarlund] Hammarlund Hq 128 troubleshooting

[Rodger]

Hi Thomas,

As I recall, the Hammarlund 129X uses different capacitor sections to 
provide proper L/C ratios on the various ranges.  Any chance that the 
rotor has shifted within the stator on the main or bandspread tuning 
capacitor causing a section to be shorted?  Typically you would get some 
crackling noise as you tune the control.  Try opening both the main and 
bandspread capacitors to their full open position as even if the spacing 
is off they should not short in that position.

Also, see if your conversion oscillator/mixer is running.  You can use a 
general coverage receiver with an antenna lead near the converter tube 
(6K8) in the 129.  The HQ-129 has a 455 KC IF as I recall so you should 
find the conversion signal about 455 kilocycles (hertz) above the marked 
frequency of the dial.  This also is a handy way to do the calibration 
alignment on the receiver and helps avoid wrong side tracking with a 
badly misaligned receiver.

Good luck,
Rodger WQ9E



Thomas Clay wrote:
> Hello all,
> I recently aquired a recapped HQ 129x in very good condition.All tubes 
> test fine the recever only receive on one band.The dial calibration is 
> off on that band as well.I have an rf signal generator and can hear
> NO output on ant band except the one that is working.The receiver 
> noise does increase on that band but not on the others.No amount of 
> adjustment on the rf and ocs coils makes any difference in background 
> noise on any of the dead bands.The bandswitch looks to be good.I ohmed 
> out the coils and have no breaks in them.Does anyone else have any 
> tips or tricks they might share.
> Thanks
> Thomas
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