hw-101 carrier null

[John Campbell]

Jim, it sounds like you have a defective carrier null pot. This problem
was also common in the SB series transmitters. The fact that you have to
manipulate the control shaft pretty well confirms a bad control.

       Good luck.....John



>Date:         Tue, 22 Dec 1998 14:57:13 -0700
>Reply-To:     n7kbj <n7kbj at ONEIMAGE.COM>
>From:         n7kbj <n7kbj at ONEIMAGE.COM>
>Subject:      hw-101 carrier null
>To:           HEATH at LISTSERV.TEMPE.GOV
>
>Season's greetings to all you heath guru's!  Once again I need your
>advice on an HW-101 problem.  My rig is showing almost full output
>when the mike is keyed and and the mike/cw gain is fully off.  Attempts
>to null the carrier produce only erratic changes and no nulls, unless I
>pull or push a bit on the shaft of the null control.  I have read from
the
>list that the 6EA8 at V1 should maybe be replaced with a 6CQ8 to
>prevent V1 from going into occiliations.  However, I have also read in
>the service bulletins that there was apparently quite a problem with
>failures of the carrier null control.  My question is this - which
problem
>do you think I have here (or both)?  and if it is the control, anybody
have
>a good replacement source for these little things - manual say it's a
>200 ohm?  Thanks in advance!!
>Jim - N7KBJ
>
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