HW101 Modulation

[Stu Lyon]

Jerry,
By AM carrier, do you mean the carrier is not suppressed even though the
audio is there? I think it's the 200 ohm "carrier balance" pot. Those
particular pots are bad things. I've replaced them on four SB-401's, a
SB-101 and a HW-101. The SB-101 I built in 1968 and it worked for years and
then, one day, the signal was as you describe yours. The pot suddenly opened
up.

The fix is to replace the balance pot with a 3/8 square 10 turn trimpot,
mounted on the top side of the board. They are available from Mouser and
Digitek for about $2.00. You should also replace the 240 ohm resistors.

This should fix your rig.

73, Stu W6CUX
Winnetka, CA
slyon at pacificnet.net


----- Original Message -----
From: "H.G. Jerry Dowell" <RECCOP18 at AOL.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Friday, April 25, 2003 12:15 PM
Subject: HW101 Modulation


> Gentlemen:
>
>        My perfect HW101 has a need for the Emergency Room. In perfect
> condition till last weekend, and Now, it will no TX in USB / LSB in the SB
> mode.  I'm getting a solid AM type carrier. Everything else OK.  Need
help.
> Advise.
>        Again Soon
>
> W0GYR
> H. G. Jerry Dowell
> 19201 E. Truman Rd.
> Independence, Missouri
> 64056-2432
> 816-796-0800
> RECCOP18 at AOL.COM
>
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