FW: [Hammarlund] HQ-170 questions

[Jim]

Al: the mail list came back up. My reply did not make it to the list server.
Not sure if I should re post it again or not, but I am going to send it
again. My apologies if this message posts twice.
Jim
WA8SDF
---------- From: Jim <barrie@eos.net> Date: Thu, 14 Nov 2002 18:02:59 -0500
To: Al Parker <anchor@ec.rr.com> Subject: Re: [Hammarlund] HQ-170 questions

Hi Al, Thanks for writing. You were the first to send anything. Am totally
stumped as to what the problem might be. I don't have a good enough signal
generator to do an IF alignment, but if the IF's were messed up, 160,80 & 40
wouldn't be working. Last night I was listening to a bunch of LA0's from
Norway on 75M ssb, with it on a longwire up 15-20 ft!

I am getting some stations on 20, but VERY weakly. Ditto for 15 & 10. I can
here the calibrator (not as strong as 40 & below, but it's there). I've
found a bunch of cold solder joints, and spent a lot of time on the wafer
switches cleaning them. The only thing I found so far was the what I wrote
about below. I peaked all the RF stages, using the vfo  from my TS-830S. All
the voltages and resistances are there, more or less. Nothing really off. I
noticed that , when I can hear a station on 20M, the side bands are
reversed.... upper comes in on the lower setting. 160,80,& 40 work
normally... LSB is L , and USB is U.  the BFO tuning seems to be working OK.

Also, is the mailman.qth.net  server down? I work at an ISP in Cincinnati,
and as far as I can tell, they have been down since last night. They still
are not up as I write this.

thanks for any help + 73's, JIM WA8SDF

It's not real Ham radio if it doesn't weigh at least 50 lbs!

> From: "Al Parker" <anchor@ec.rr.com> Date: Thu, 14 Nov 2002 14:59:38 -0500 To:
> "Jim" <barrie@eos.net>, "Hammarlundqth" <hammarlund@mailman.qth.net> Subject:
> Re: [Hammarlund] HQ-170 questions
> 
> Hi Jim, Did you get any responses?  I've been slow in getting to things here.
> I think I've got some info "somewhere" re: changes to the HQ-170's as they
> went thru the evolution process.  I'll do some digging if you still need it, I
> do remember that there are some ckt changes, but don't remember just where.
> I've been thru 2 of them fairly recently, and came across differences, and
> some documentation I think. 73, Al, W8UT New Bern, NC BoatAnchors appreciated
> here http://www.thecompendium.net/radio/ http://www.hammarlund.info
> 
> ----- Original Message ----- From: "Jim" <barrie@eos.net> To:
> <hammarlund@mailman.qth.net> Sent: Wednesday, November 13, 2002 12:03 AM
> Subject: [Hammarlund] HQ-170 questions
> 
> 
>> Hi all, I'm restoring a HQ-170, SN 1342, and it's been a lot of fun. Have run
>> into a problem and need some advise. I have a low sensitivity problem on
>> 20,15 and 10. 80 and 40 works great, but the upper bands have very low
>> sensitivity.
>> 
>> I've peaked all the RF stages. Have replaced all the tubes with known good
>> ones. Injected a signal at the first IF and got a good signal out. In looking
>> at the schematic that I down loaded from bama ( HQ-170 manual, issue #2) I
>> found  that R10 (off pin1 of the 6BE6 2nd Converter) was a 33K resistor in my
>> 170. The bama  schematic called for an 47K . Also R98 (a 160 ohm off pin2 of
>> V3) was completely missing.  All the caps are either silver mica or discs.
>> 
>> I would appreciate any help or advice. If there is anyone that has a 170 that
>> would be willing to look at theirs and see what they have, I'd really be
>> grateful. Thanks, Jim, WA8SDF
>> 
> 
>