[Hammarlund] hq-145a specification

Wed Nov 6 11:20:16 EST 2019

appologies for the wasted bandwidth...

Hi all

thanks to all that replied. These definitely gave me an idea on how well this radio is suppose to perform.
I also emailed AB2RA she has a lot of experience in both vintage and modern rf design and she's got a nice
write-up of her restoration on the HQ-145

http://www.wirelessgirl.net/Projects/Receivers/HammarlundHQ145.html

Doing the initial steps in aligning the front end, improved my dial accuracy. It also seemed to have helped
with the "double spotting"/image rejection i was noticing on band 4.0-10.0.

after i aligned the HFO, i decided to call it. I didn't want to be in there longer than I needed to be.
my experience in vintage tube tech places me in the marginal golden screwdriver operator and
did not want to inflict more damage. right now after the hfo alignment radio seems work ok. the rf portion 
could probably use some tweak, but for now i will keep it as is and fix problems as i find them. i might
also take measurements later, but right now seems good enough.

regards
fernan ve4feb

> Sent: Tuesday, November 05, 2019 at 8:17 PM
> From: "Jon Teske via Hammarlund" <hammarlund at mailman.qth.net>
> To: 1oldlens1 at ix.netcom.com, hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] hq-145a specification
>
>  The Hammarlund dials from the HQ-120, HQ-129x,HQ-140 and HQ-150 all used the same 
> left hand dial. Late HQ-129x's 140s and 150s  added 15 meters, which was a new band in the
> early 1950s to the dial.  If you have a 129 and can find the dial that adds 15 meters (I was able
> to do this - you probably would have to find a 140 or 150 that somebody was "parting" out
> to do this. Those 4 receivers had pretty much the same configuration and theory of operation.
> The 120 updated many parts from pre-war (WW II) to posts war. and a few tube changes. The
> 140 was about the same concept of operation but was built with miniature glass tubes. The 150
> added a Q- multiplier.  Of course the WARC bands  30, 17, and 12 meters were decades in the
> future. One could plot the frequencies out on a graph; or get an add-on digital read-out. BTW
> those dials all had the same part number for the LH dial and only 1 number difference for the 
> pre and post  15 meter dial. They use the same hardware and are totally interchangeable.
> 
> About 50 years ago I had another HQ-129x given to me.  The dials were all warped throughout 
> their diameter.  I could not find a replacement (no internet then), so I carefully drafted a replacement
> dial. I had mechanical drawing in high school. I also added 15 meters. I found Press-0n letters in
> the same font and size as the originals.  I then had a contact negative made and laminated it
> between transparent plastic with some sitck-um. I took the warped dials off and replaced the
> plastic dial.  I sold the receiver before a move.  Somewhere out there, there is an HQ-129 with
> white on black dials,much like Hallicrafter dials.  LOL  I don't think I'll ever try that again. I probably
> could do an even better job with CAD software which didn't exist then.  That HQ-129x had just
> about every modification published about it up to that time.
> 
> Jon Teske W3JT
>  
>  
> -----Original Message-----
> From: Richard Knoppow <1oldlens1 at ix.netcom.com>
> To: hammarlund <hammarlund at mailman.qth.net>
> Sent: Tue, Nov 5, 2019 5:54 pm
> Subject: Re: [Hammarlund] hq-145a specification
> 
>     I don't know and couldn't find any specs but did fine a good 
> PDF version of the instruction book including an insert for the 
> fixed frequency crystal local oscillator. Its at:
> http://www.jamminpower.com/PDF/HQ-145.pdf
>     Much easier to read than the Deja Vu version on BAMA.
>     If you think there are problems with performance I suggest 
> you ask here. Meanwhile I am looking for something with actual 
> performance specs similar to the production notes book from 
> National which is on BAMA.
>     BTW, I am in the midst of working on an HQ-129-X. I have had 
> this receiver for several years but need to fix some problems. 
> Once I get them fixed I will post here for others who may have 
> the same ones.
>     It is essentially a very nice receiver but has some puzzles, 
> for instance, why did Hammarlund decide on the inside out dials? 
> I call them that because the low frequency band is on the outside 
> and the highest frequency band on the inside, just the reverse of 
> most receivers and just the reverse of what you want to get the 
> best calibration resolution. HQ-120-X is the same. I don't know 
> about later receivers in this line like the HQ-140-X.
> 
> 
> On 11/5/2019 11:04 AM, Fernan Bolando wrote:
> > Hi all
> > 
> > I'm not sure if i posted this already some place else, but...
> > 
> > I was wondering if any knows or can guesstimate the specification
> > of the HQ-145a in terms of the following parameters
> > 
> > 1. Dynamic Range
> > 2. Image Rejection Ratio
> > 3. Dial accuracy
> > 
> > I have recently acquired an HQ-145a and have been using it as my main
> > receiver for a while now. I did notice things like. Double Spotting and
> > dial accuracy/alignment problems. I would like to know what its limits
> > before I start further alignment.
> > 
> > I am also looking for an s-meter cover for it. if somebody has one please
> > send me pricing so i can start saving up :)
> > 
> > regards
> > fernan ve4feb
> > ______________________________________________________________
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> > 
> > 
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> 
> -- 
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
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> 
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> 
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> ** For Assistance: gharmon at idworld.net **
> 
> 
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