[Hammarlund] Hammarlund Digest, Vol 166, Issue 1

Frank Barnes fbw4npn at gmail.com
Wed Jun 5 19:30:51 EDT 2019 

I think many of us would be interested in an external and/or internal
product detector for the Hammarlunds, so please post what you can, when you
can.
Frank
W4NPN

On Wed, Jun 5, 2019 at 11:58 AM <hammarlund-request at mailman.qth.net> wrote:

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> Today's Topics:
>
>    1. Re: HQ-129X - more. Product Detector (Kenneth G. Gordon)
>    2. Hammarlund HQ-129X - more (Kenneth G. Gordon)
>    3. Re: HQ-129X Parts for sale (Richard Knoppow)
>    4. Hammarlund Restoration & Noise Level (Frank Barnes)
>    5. Re: Hammarlund Restoration & Noise Level (Jon Teske)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 30 May 2019 11:56:31 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: Mark Dinsmore <markdinsmore at gmail.com>, John King
>         <k5pgw at yahoo.com>
> Cc: Hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] HQ-129X - more. Product Detector
> Message-ID: <5CF0275F.18363.28A06FC7 at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=US-ASCII
>
> On 30 May 2019 at 16:36, John King wrote:
>
> > Ken and Mark, would you please put me in the loop on the external
> product detector since I have
> > HQ 120 (nice), two HQ 129 X, beautiful completely refurbished HQ 140 X,
> and BC 779. I have
> > later HQ 170 As and HQ 180 A. I also need a replacement clock for my HQ
> 180A. The HQ 180A
> > went under in the flood caused by Hurricane Harvey that flooded Houston,
> Texas. It is OK except
> > for the clock.
> >
> > Thanks and 73, John K5PGW
>
> John, and Mark:
>
> In my opinion, there are two, and possibly three, different ways to
> accomplish this: 1) modify
> the receiver internally like I did with my BC-779, 2) build an external
> adapter, and 3) build a
> plug-in adapter.
>
> For method #1 above, what I did with my BC-779 back in the 1960s was to
> use 1/2 of the
> 6N7 noise-limter tube in a single-triode product detector, the circuit for
> which I took from that
> PD which Heathkit used in all their SSB rigs, and which THEY took from
> Collins. One
> advatage to this particular PD is that with the BFO turned off, it does a
> good job of
> demodulating AM signals too. The circuit diagram for that PD is in every
> SB/HW all-band
> SSB rig's manual. It is quite simple and works, in my experience, very
> well.
>
> For Method #2, Mike Bittner, W6MAB, wrote up an article recently in
> Electric Radio
> Magazine for a complete, stand-alone, external unit which had an IF amp, a
> PD, and a BFO
> in it. He built this for use with his SX-28A. This unit can be attached to
> any receiver. One
> must bring out a cable from the last IF stage in the recever, and take a
> cable from the
> external unit back into the receiver with the audio output.
>
> Mike's unit used all metal octal tubes. It can be powered by either the
> receiver, for by an
> external power supply if desired.
>
> I will post the issue and date here as soon as I find it.
>
> For method #3, one could build a PD version of the Pullen mixer onto an
> octal or other tube
> base, and simply plug it in place of the usual detector. After all, all a
> PD is, is an IF to audio
> mixer stage.
>
> As far as the HC-10 is concerned, yes, that would be about the best method
> of doing this for
> Hammarlund receivers, if the HC-10 wasn't both so darned hard to find, and
> so very
> expensive when you find one. I have given up on that.
>
> BTW, Central Electronics also made and sold an external PD adapter, but
> that is also very
> rare. I think B&W did too.
>
> I'll post more info when I can.
>
> Ken W7EKB
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 30 May 2019 12:06:20 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: Hammarlund at mailman.qth.net
> Subject: [Hammarlund] Hammarlund HQ-129X - more
> Message-ID: <5CF029AC.2076.28A96DD7 at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=US-ASCII
>
> OK. I just checked the on-line index for ER Mag and find 10 separate
> articles on building or
> adding PDs to receivers, going back to December 1992.
>
> The most recent one by Mike Bittner is in ER # 357 of February 2019
> beginning on page 2.
>
> Ken W7EKB
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 30 May 2019 12:34:31 -0700
> From: Richard Knoppow <1oldlens1 at ix.netcom.com>
> To: hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] HQ-129X Parts for sale
> Message-ID: <dbf6a662-4bf7-3ad6-dc4b-f53e24b34f74 at ix.netcom.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
>     If you have dials that will work on an HQ-120 I am interested.
>
> On 5/30/2019 7:29 AM, Doug Hensley wrote:
> >   Trying this again ... I have a box of HQ-129X parts for sale.
> Pictures on request.  Left over at
> > an HQ-129X fanatics shop.  Pretty sure it's good stuff.
> >
> > Cheers,
> >
> >
> > Doug W5JV
>
> --
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 5 Jun 2019 09:49:18 -0400
> From: Frank Barnes <fbw4npn at gmail.com>
> To: hammarlund at mailman.qth.net
> Subject: [Hammarlund] Hammarlund Restoration & Noise Level
> Message-ID:
>         <CAOufO--dEneAaSTyb4hche9-gvHk9d_n5BQ_bdcN3a1=
> U9jN_g at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> I had posted earlier about restoring a HQ-129-X and how much I liked it.
>  But the QRN noise level was intolerable at my location, wiping out almost
> every station.
>
> Antenna in use was a ~400 foot low elevation random wire snaked in a rough
> "J" shape through the woods behind my house.
>
> I just added another 100 feet of wire to it and converted it to a
> roughly-shaped LOOP antenna, fed with 450 ohm twinlead.   Bingo!   The
> noise disappeared almost completely and I now have dozens of stations to
> choose from.
>
> Horizontal loops are known to be less responsive to radiated interference
> from various devices, and noise in general, but I did not realize how much
> difference one would make.
>
> I can tune in CHU on 7.85mhz in the morning and the receiver will sit on it
> all day without drifting, after warm-up.   CHU is in Ottawa.   Oddly, I can
> almost not hear WWV from Fort Collins, CO,  on 10mhz...very weak and
> sometimes not at all.  I can't imagine that the "loop" is directional.
>
> I think that even a 100 foot loop would perform well.   Receiving - only,
> of course, not for transmitting.   I'm happy with the HQ now.
> Frank
> W4NPN
>
> --
> Frank Barnes
> W4NPN
> Chapel Hill, NC
> Grid Square FM05
> Cell 919.260.7955
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 5 Jun 2019 15:58:02 +0000 (UTC)
> From: Jon Teske <jdteske at verizon.net>
> To: fbw4npn at gmail.com, Hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] Hammarlund Restoration & Noise Level
> Message-ID: <670498005.1102403.1559750282683 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
>  Here in Metro Washington DC it is also hard to hear WWV on any
> frequency.? Now
> when I last tried I was just using 50-60 feet of random wire out the
> window. I have no
> antenna to compare with your set up.? I suppose one might be tempted to
> blame
> WWV that our elected politicians don't know what time it is.? I suspect
> that is
> not the root cause.? They should never have moved it out of Greenbelt, MD
> (I was once located next to the Goddard Space Flight Center. (Actually it
> is
> the other way around.? Goddard (which just celebrated its 60th Anniverary)
> was
> built next to WWV.? Does anyone know why the east coast of the US is such
> a dead
> zone for WWV?
> Jon W3JT
>
>
> -----Original Message-----
> From: Frank Barnes <fbw4npn at gmail.com>
> To: hammarlund <hammarlund at mailman.qth.net>
> Sent: Wed, Jun 5, 2019 9:50 am
> Subject: [Hammarlund] Hammarlund Restoration & Noise Level
>
> I had posted earlier about restoring a HQ-129-X and how much I liked it.
>  But the QRN noise level was intolerable at my location, wiping out almost
> every station.
>
> Antenna in use was a ~400 foot low elevation random wire snaked in a rough
> "J" shape through the woods behind my house.
>
> I just added another 100 feet of wire to it and converted it to a
> roughly-shaped LOOP antenna, fed with 450 ohm twinlead.? Bingo!? The
> noise disappeared almost completely and I now have dozens of stations to
> choose from.
>
> Horizontal loops are known to be less responsive to radiated interference
> from various devices, and noise in general, but I did not realize how much
> difference one would make.
>
> I can tune in CHU on 7.85mhz in the morning and the receiver will sit on it
> all day without drifting, after warm-up.? CHU is in Ottawa.? Oddly, I can
> almost not hear WWV from Fort Collins, CO,? on 10mhz...very weak and
> sometimes not at all.? I can't imagine that the "loop" is directional.
>
> I think that even a 100 foot loop would perform well.? Receiving - only,
> of course, not for transmitting.? I'm happy with the HQ now.
> Frank
> W4NPN
>
> --
> Frank Barnes
> W4NPN
> Chapel Hill, NC
> Grid Square FM05
> Cell 919.260.7955
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> End of Hammarlund Digest, Vol 166, Issue 1
> ******************************************
>


-- 
Frank Barnes
W4NPN
Chapel Hill, NC
Grid Square FM05
Cell 919.260.7955

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