[Hammarlund] HQ-180 alignment issue

[Bob Camp]

Hi

The fact that you get calibrator tones suggests that the radio has an alignment problem. The crummy tone suggests a grid cap / grid resistor problem. It might be a screen bypass / bias as well, but grid is a lot more likely. A bit of quality time with the schematic might zero you in on one that switches out on the high bands. 

Bob

On Aug 22, 2014, at 8:31 PM, Robert Sauvan <rsauvan at beyondbb.com> wrote:

> Hi Bob,
> I have been working towards a remedy to my problem. Have pretty muchcancelled out tube problems. Have swapped numerous tubes with no change or improvement in any way.  I am suspect of my signal generator. I am hoping it only to be a tube. Wont go into detail as to why it is the signal generator but it is acting a bit weird. If it is not the tube, I will look for another generator to do my alignment again. In the mean time though, the signal noise floor of the receiver on these two bands is way down from the other bands.I checked my other old receivers and they have a similar lower noise floor being that they arent as loud as the other bands either. Too bad neither band seems to be open these days to see if I can hear signals. I can hear my calibrate tone without any problem on both bands. Although, the calibrate tone on 15 meters is just plain terrible.Not a good solid tone like all of the other bands. Very sporadic. If it is something dead in the radio though, where would I head to seek the problem first? Any suggestions?
> 
> Thanks-Bob-W0YBS
> 
> 
> On 8/19/2014 4:56 AM, Bob Camp wrote:
>> Hi
>> 
>> A few hints:
>> 
>> 1) Unless you swapped tubes from a working radio - always suspect the tubes.
>> 2) Check the tubes with a tube tester (see item one).
>> 3) How good is your signal generator? Time to check it ….
>> 4) Do you get noise when you attach the antenna? If so - alignment, if not - dead parts or major alignment or dead antenna or …
>> 5) Same as 4, except with a 100 KHz calibrator signal
>> 
>> There’s lots more to consider, but that should get you a bit further down the path.
>> 
>> Bob
>> 
>> On Aug 18, 2014, at 11:14 PM, Robert Sauvan <rsauvan at beyondbb.com> wrote:
>> 
>>> Hi all,
>>> I recently did an alignment on my HQ-180. It seemed to have gone quite well except I have noticed for the first time today that 15 and 10 meters dont seem to be working. What I mean by that is when I do a zero beat with my Ranger transmitter, I do not hear a tone. Works fine on all other bands. Since I am unable to hear any signals on these 2 bands, I cant even tell if I am in the ham bands. I noticed this when I was doing my alignment on 20 meters. After I thought I was done with the band, I had noticed signals were out of the ham band. I was able to correct that with tuning my coils and bringing the signals into the band and then calibrated. I have replaced both tubes 6C4 and first mixer 6BE6 with numerous others and no change. Any ideas what I should look for next?
>>> 
>>> Thanks-Bob-W0YBS
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>