[Heath] HW-101 VFO
Dave Edwards
kd2e at comcast.net
Sat May 12 12:52:44 EDT 2012
Bernie....unrelated (somewhat), but
can you post the time/frequency for the Sunday Heathkit net?
....Dave
On 5/12/2012 9:30 AM, Bernie wrote:
> Please let me add my two cents (or a quarter's) worth. This HW-101 and
> power supply that David went through is now in my hands, and it is
> truly a sweet rig. Other than my digitally synthesized rigs (Icom 706
> MKII-G and the Kenwood TS-430S), this HW-101 is more stable than my
> Hallicrafters SR-160, or even my Kenwood TS-830s hybrid. I can turn on
> the HW-101 from a cold start, find a nice two-sided QSO on 20 meters,
> dial it in, and maybe, after 10 or 15 minutes, just touch the VFO to
> move it 40 or 50 hertz and it's there the rest of the day.
> I have David's notes on the way to the post office today, and he will
> have them in a day or two and I'm sure he will share with the
> list-serve anything he has failed to cover here. The new Jackson drive
> is superb, smooth, solid, and a joy to use.
> Now this is the best part. For those of you on the list-serve group
> that haven't heard this...this is the story of how I acquired this
> super transceiver. David, W1EUJ, posted up that he had an HW-101 that
> would like to trade, but not for ham gear or other electronics. He was
> looking for something unique, and would be open to offers for two
> weeks, after which he would decide who offered the most unique item or
> items. Since I am in northwestern North Dakota, the nation's #1 hot
> spot for oil exploration, drilling and production from the newly
> discovered Bakken (pronounced bawk'-ken) formation, I offered a pint
> of Bakken crude oil. I was amazed when David e-mailed me with his
> decision. I sent a bunch of 1.5 ounce miniatures labeled "Williston
> Basin Energy Festival, September 2011" along with a couple of bumper
> stickers, one saying "Rockin the Bakken" and the other "Fracturing the
> Forks". The Three Forks/Sanish formation lies just 50 to 100 feet
> below the Bakken and is actually thicker and larger in size. I also
> sent "Talkin the Bakken" a monthly oil patch publication, and of
> course I'd be remiss if I didn't send the state's latest North Dakota
> Travel Guide.
> In collaboration with David, I'm preparing to produce a video of the
> HW-101 in operation for posting on You Tube, also telling the story of
> how he graciously parted with his labor of love, to provide an old man
> some real pleasure and enjoyment of operating this venerable piece of
> gear. I cannot stress enough the fine job David did in the
> restoration of this. It looks factory fresh (with a few tiny paint
> chips on the front rim) and runs like a fine-oiled machine. Lot's of
> QSO's thusfar, even checking into the Heathkit Net on a Sunday
> afternoon and telling "the story". Hats off to you, David, and thank
> you. 73
> Bernie in ND
> WD0GMD
>
> ----- Original Message -----
> *From:* David Goncalves <mailto:davegoncalves at gmail.com>
> *To:* Janusz Juryk <mailto:ve2zhp at yahoo.ca>
> *Cc:* Heathnet <mailto:heath at puck.nether.net>
> *Sent:* Saturday, May 12, 2012 4:04 AM
> *Subject:* Re: [Heath] HW-101 VFO
>
> I think, aside from one thing, this is what I did. I invented
> NOTHING here. My theory was that if the best minds in the hobby
> couldn't make it work over the last 40 years, that I'd take it out
> and replace with a highly filtered DDS VFO.
>
> Refer to these: http://www.ultrawebb.com/OHP/SERVICE.htm
> http://www.ultrawebb.com/OHP/NRWILLIAMSON.pdf
>
> 0. Replace all resistors with new 1/2W 5% carbon film resistors
> (bought good stuff from Digikey), except change R947 to 1k (per
> service bulletin HW-101-2)
> 1. Check PN of coil in VFO, change it according to HW-101 service
> bulletin HW-101-1 (mine did not need this)
> 2. Change C947 to 47pF NP0 per service bulletin HW-101-19 and C951
> to a 10pF N750 per Williamson (I have perhaps ONE to spare).
> 3. Install a heavy wire per service bulletin HW-101-27.
> 4. Hot-glue C946 per service bulletin HW-101-42.
> 5. Verify that peaking of VFO coil is correct per service bulletin
> HW-101-45 and N.R. Williamson.
> 6. If you find the VFO stops working in CW/USB on the upper end of
> bands, change R947 back to 470 Ohms (per service bulletin HW-101-52).
> 6. Get the verniers working well. I ended up buying a new set from
> Jackson Brothers (see here:
> http://www.mainlinegroup.co.uk/jacksonbrothers/4511.htm) and get
> Model 4511DAF. Machine the shaft to the length of your original
> set, and install for that original 70's feel.
> 7. Make sure your supplies to the VFO are stable. Particularly,
> upsize some of the resistors on the Power board (I'm getting to
> those notes soon!!). Make sure to redo your HP-23.
>
> That is what I did, and it works very well. I really think you
> have to go through the radio completely to really get everything
> stable and running sweetly. One could argue that some of these
> changes have more impact than others - and given the difficulty of
> finding N750 caps one might have to evaluate that - but I found
> that all the rest was easy and just did them all.
>
> Best of luck,
>
> David Goncalves
>
> On Thu, May 10, 2012 at 11:05 AM, Janusz Juryk <ve2zhp at yahoo.ca
> <mailto:ve2zhp at yahoo.ca>> wrote:
>
> Greetings everyone,
>
> I'm rebuilding the VFO from a HW-101 and there are certain
> components that need changing. The crystal diode is one and
> need to know what equivalent could be used.
>
> Cheers
>
> Janusz ve2zhp
>
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>
> --
> David Goncalves
>
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