hw101 problems part four

[VE3FWF]

Mike:

This one does sound like a real challenge (the polite way of not saying a
swear word).

Some more suggestions:
1. Complete wiring harness checkout to make sure  that  wiring error(s)
is/are not the issue here.  (a wiring error on  the relays could lead to
some interesting results!)
I assume that you have already cleaned the relay contacts with a thin strip
of white bond paper?
2 Check the diodes in the RF gain area --- in particular D905 and D101 on a
HW-100 (I assume that is the same numbers for the HW101?) for being wired in
backwards, shorted or open.
3  Possibly a solder bridge somewhere on a board?  Really hard to find ...
4. A cold solder joint? Resolder all the joints on the modulator circuit
board first.
5. Pull the 6146s out of the cage to rule out that you do not have parasitic
oscillations in the finals (not likely the problem but you can never tell).

You may have several faults here not just one ...

Good luck and keep us posted on getting that green machine going ...

73 de Bernie, VE3FWF



----- Original Message -----
From: "MIKE BRYCE" <prosolar at SSSNET.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, February 02, 2004 10:34 AM
Subject: hw101 problems part four


> boys and girls...
>
> this radio that I am working on is nearly mint.. that kinda makes me
wonder
> if there is a wiring problem. there's too many problems to be just a out
of
> spec resistor hiding on a pc board.
>
> in fact, the radio must have been one of the last ones made. the resistors
> are all metal film and not carbon like the older rigs used.
>
> but some updates
>
> radio goes into oscillation when the ptt line is pulled low. no mic
> connected
>
> RF gain control is still wacky
>
> tighten all the hardware up a second time. ensured all tube shields are on
> and grounded
>
> did a alignment
>
> called the pope, he was busy...
>
> replaced the carrier pot and the four hot carrier diodes (again)
>
>
> Mike Bryce, WB8VGE
> SunLight Energy Systems
>
> http://www.seslogic.com
> http://www.theheathkitshop.com
>
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