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Author Topic: Hamfest HW-8 Resurrection  (Read 5542 times)
WA7KGX
Member

Posts: 104




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« on: August 25, 2013, 09:39:15 PM »

Against my better judgement I picked up an HW-8 at Saturday's
Clark County Hamfest in Vancouver, Washington.

The note on the Heath proclaimed the receiver worked on all
bands (true) and transmitted OK on 80 and 40 but not 20 and 15.
80 meter transmit seems fine.  The little meter shows plenty of
output on 40, but the signal looks more like broadband noise.
No output on 20 and 15 beyond oscillator leakage.

The circuit board is charred under RFC3, the final transistor collector choke.
The choke has been replaced and there is a heat sink on the final transistor.
An early mod might be a power line fuse :-)

Any hints?

I could also use a single image of the schematic.  My attempts at
pasting one together from the six partial images have not been
satisfactory.

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WB6BYU
Member

Posts: 13280




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« Reply #1 on: August 27, 2013, 07:39:14 PM »

I have an HW-8, and I think the whole manual (as well as a copy of the Hot Water Handbook.)
I live down by Hillsboro High School, and I'm sure we can find a way to get together.

You can email me at my callsign at a double-R L dot net.
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KE2EE
Member

Posts: 21




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« Reply #2 on: August 29, 2013, 06:46:51 PM »

I bought a new HW-8 kit in 1979 when I got my Novice ticket. Not a bad rig at the time and I made alot of contacts on 15m. To fix your rig I would :
Check rx on all bands to see if oscillators are working.( if one band out check switching diodes)
There is a mechanical TX/RX relay on the corner of the main board, clean the contacts with solvent and heavy paper.
Do a complete alignment on the rig
Check TX driver and TX final transistors, there is a high SWR protection zener used in the final- test for short.
The TX uses diode switching for each band, if one or two bands are out check respective diodes.
Final output is about 1-2 watts. 

Mike    
« Last Edit: August 29, 2013, 06:51:12 PM by KE2EE » Logged
W9GB
Member

Posts: 2623




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« Reply #3 on: August 30, 2013, 05:43:11 PM »

Heathkit HW-8
http://home.frognet.net/~mcfadden/wd8rif/hw8.htm

HW-8 Assembly & Operation Manual
http://www.utm.edu/staff/leeb/hw8.pdf
« Last Edit: August 30, 2013, 05:47:35 PM by W9GB » Logged
VE3WMB
Member

Posts: 288




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« Reply #4 on: September 01, 2013, 09:36:27 PM »

I will add to that list of resources,  the HW-8 Yahoo Group :

http://groups.yahoo.com/neo/groups/hw8/info

Michael VE3WMB

P.S. I think that you can still get a digital copy of the HW-8 handbook (Mods and repair info)
from QRP ARCI .

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WA7KGX
Member

Posts: 104




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« Reply #5 on: September 02, 2013, 02:53:41 PM »

Thanks for the help.  I found a cut trace that prevented sending on 20 and 15.
My #47 pilot lamp dummy load now lights up on all four bands.

It is fun to have a radio that responds to hand movement.

It will take a bit to get my code back before I can make contacts with it.
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WA7KGX
Member

Posts: 104




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« Reply #6 on: September 03, 2013, 08:17:32 PM »

My HW-8 now outouts about a watt on 20, perhaps 700 mW on 15.
Is that normal?

Just now W1AW code practice was blasting out the headphones.
I copied much of the slow stuff.
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WB6BYU
Member

Posts: 13280




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« Reply #7 on: September 03, 2013, 09:30:55 PM »

That seems a bit low - I think it was rated for 3.5W output on 80m and about
2W output on 15m, but that does depend on the battery voltage.
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WA7KGX
Member

Posts: 104




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« Reply #8 on: September 03, 2013, 10:51:16 PM »

The 3.5 Watt Heathkit spec refers to input power, typical for the days when the
FCC regulated power limits by limiting input power.
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