[Hammarlund] HQ-100C Alignment

[Bill Stewart]

Good afternoon, 
Here is the latest report on this project. Rodger, I did pretty much as you suggested and now the 10-12mc dead zone is active with signals and the dial calibration is much closer. So that problem seems to be fixed. I then went through the RF and then the Antenna adjustments with some success. However, the stuck slug is the bottom RF adjustment for the 10mc freq in the 10-30 band...so, can't tweak it and sigs are pretty weak around 10-12mc. I may just live with that...not much to listen to in that range anyway. I also noticed an image of the very strong CW numbers station in the 10-30 band. I think images are the norm, esp. in that 10-30mc band.

Now to the BFO. I'll work on that a bit and see what I run into. More on that later. I expect I'll have a few more questions as I progress. 

Many thanks to you Rodger and all the others who offered help and suggestions. What a great group of ops.

73 for now, Bill K4JYS

----- Original Message -----
From: "Rodger Singley" <rbsingl at ilstu.edu>
To: "Bill Stewart" <cwopr at embarqmail.com>
Cc: hammarlund at mailman.qth.net
Sent: Tuesday, October 20, 2009 12:45:35 PM GMT -05:00 US/Canada Eastern
Subject: RE: [Hammarlund] HQ-100C Alignment



Bill,

Tune your TS-440S to 12.455 and set the HQ-110 dial to 12 Mhz.  Set the bandspread to the set point (make sure the bandspread capacitor is at its unmeshed position).  Now adjust the oscillator coil so that you hear the oscillator signal with the TS-440S.  Set your signal generator to 12 megahertz (you may have to rock the generator dial a few Khz. either way if the calibration is a bit off) and peak the antenna and mixer coils.  

Reset your HQ-110 dial to 28 Mhz. and tune your TS-440S to 28.455 and adjust the oscillator trimmer cap so that the signal is heard in the TS-440S.  Set your signal generator to 28 megahertz and peak the mixer coil trimmer cap.

At this point, I still think it is just way out of alignment instead of having an actual component failure.  Alignment using these steps will avoid accidentally aligning on an image or spurious frequency.  I repaired a friend's SX-24 last year and it performed similarly due to alignment being way off on the highest range.

Let me know how this procedure turns out.

73, Rodger WQ9E


-----Original Message-----
From: Bill Stewart [mailto:cwopr at embarqmail.com]
Sent: Tue 10/20/2009 11:29 AM
To: Singley, Rodger
Cc: hammarlund at mailman.qth.net
Subject: Re: [Hammarlund] HQ-100C Alignment
 
Good Morning HQ-100C advisers,
Here's what I've done this morning. I ran a wire from the HQ-100 over to a TS-440S (test rcvr). I started on the BC band (.54-1.6). Put the sig. gen. on 1kc, tuned the HQ-100 to the sig. gen. and listened on the TS-440S...and got a sig. at 1.455kc...did the same on 1.6-4 band...gen. at 3kc, HQ-100 tuned to that sig, and heard a sig at 3.455kc on the TS-440S. Also same type results on the 4-10 band. Dial readings were pretty close to actual freq. Now, on the screwed up band (10-30), I put the sig. gen. on 15mc, and found that sig. on the HQ-100 at around 13.4mc dial. I found a signal on the TS-440S at 15.455mc. These tests seem to indicate the IF is tuned to the upper side of the received sig. I found some weak 'images' (?) of the sig. gen. sig.(15mc) up around 26 and 27mc (dial), on the HQ-100. 

On the HQ-100, the dial calib. is about 1.6mc below the acutal signal freq. Could there be a component failure or change in the tuned circuits for the 10-30mc band? That's where I am at this point. 

Many thanks for your suggestions.
73, Bill K4JYS