[Hammarlund] Re: Hammarlund Digest, Vol 27, Issue 3

Wed Apr 5 21:56:17 EDT 2006

Hi again Julian - 
I was a bit baffled by that 'bus line' term when I first saw it.  My IF section was way off too so I guess it's not uncommon.
Sorry to hear about the other trouble below deck but it sounds like you have things under control. 

Someday perhaps you can tell me about sweep generators.
I have a 'sweeper' on the way but right now I'm using a sig gen and things are working out well so far.

Are you using a sweep gen to do this or just the sig gen part of the Tek?

Guess you'll have to crack the red paint seals on the trimmers to do the RF bits.  I'd be interested to hear how out of alignment yours are.  I'll be doing the RF section myself this weekend.

Then it's on to the 2M/6M converter.  Nuvistors!!!

Good luck - Mike - KC2OSO.

----- Original Message -----
From: Julian Bunn <Julian.Bunn at caltech.edu>
Date: Wednesday, April 5, 2006 11:37 am
Subject: Re: [Hammarlund] Re: Hammarlund Digest, Vol 27, Issue 3

> Thanks Mike ... Yes, I found that strip. The 110 had been 
> extensively worked
> on underneath, and there was a short inside the T2 IF can, which I 
> repaired.Once done, using a Tek FG504 sweep/signal generator I was 
> able to peak the
> IF very nicely ... everything was WAY off alignment. Now the IF 
> looks very
> good, and I will move onto the RF tuning.
> 
> I had to replace the PSU choke, which had fried due to the short in 
> the IF
> can I suspect.
> 
> Julian
> 
> njmikec at optonline.net wrote:
> > Hello Julian - the 110 is a great radio.
> > Ha!  I just got done with the IF alinnment on a 110 VHF model.
> > That was after removing 1" of tar and nicotine from every 
> reachable inch of the radio.
> > What a mess it was. Blech.  TSP is great stuff.
> > Anyway, the 6BE6 bus line is an open flat exposed (uninsulated) 
> "strip" coming off the 6BE6.
> > You can't miss it.  Perfect for attaching your probe.
> > If you can't find it, I can send you a picture.
> > 
> > I'll leave to others to answer #2 & #3.  
> > 
> > Kind regards - Mike KC2OSO.
> > 
> > ----- Original Message -----
> > From: hammarlund-request at mailman.qth.net
> > Date: Wednesday, April 5, 2006 4:00 am
> > Subject: Hammarlund Digest, Vol 27, Issue 3
> > 
> > 
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> >>Today's Topics:
> >>
> >>  1. HQ-110C Questions (Julian Bunn)
> >>
> >>
> >>------------------------------------------------------------------
> --
> >>--
> >>
> >>Message: 1
> >>Date: Tue, 04 Apr 2006 08:55:42 -0700
> >>From: Julian Bunn <Julian.Bunn at caltech.edu>
> >>Subject: [Hammarlund] HQ-110C Questions
> >>To: Hammarlund <hammarlund at mailman.qth.net>
> >>Message-ID: <443296FE.5030804 at caltech.edu>
> >>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >>
> >>I have an HQ-110C that has a couple of problems, and am hoping 
> for 
> >>some 
> >>help.
> >>
> >>1) The IF alignment instructions talk about connecting the 455kHz 
> >>signal 
> >>generator
> >>to the "bus line" of the mixer grid of V2, the 6BE6 mixer tube. 
> >>What is 
> >>the "bus line" -
> >>I'm not familiar with the term? Which pin on the tube is it?
> >>
> >>2) I want to add a new grounded mains lead. The existing lead is 
> >>old and 
> >>cracked.
> >>Right now the chassis earth is floating. How should the ground 
> >>connection from the
> >>mains lead be connected to the receiver?
> >>
> >>3) The choke L4 in the power supply is open circuit, and needs to 
> >>be 
> >>replaced. It
> >>is specified as 8 Henry, 375 Ohm DC. I don't have an exact 
> >>replacement, 
> >>but I do
> >>have a 5 Henry, 175 Ohm DC unit that I'd like to use if possible. 
> >>Will 
> >>this work, with
> >>a high wattage 200 Ohm resistor in series?
> >>
> >>Thanks for any advice.
> >>
> >>Julian
> >>
> >>
> >>------------------------------
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> >>End of Hammarlund Digest, Vol 27, Issue 3
> >>*****************************************
> >>
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> -- 
> Julian Bunn
> Caltech
> 
> Tel: +1 626 395 6681
> Mob: +1 626 375 4628
> WWW: pcbunn.cacr.caltech.edu/jjb.html
> 
> 
> 
> 