301/401 cw problem

[Stewart D. Lyon]

Gareth,
Below is the URL where I suggested modifing the relay driver circuit for
more positive PULL-IN of the relay:
http://interactive.tempe.gov/cgi-bin/WA.EXE?A2=ind0010&L=heath&D=0&P=4097

However I don't think that is your problem. If you grounded relay pin 7 as
suggested by WB8JKR, you have most likely already solved the problem. It has
been my experiance that that is the solution for the situation as you have
described it.

Good Luck es 73
Stu, W6CUX


----- Original Message -----
From: "Darwin D. Geiselbrecht" <GeiselD at AOL.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Tuesday, April 16, 2002 9:05 AM
Subject: Re: 301/401 cw problem


> In a message dated 4/16/02 5:53:14 AM Central Daylight Time,
> ggammon at BCGROUP.NET writes:
>
> << Hello all,
>
>  My 301/401 pair has developed an interesting problem. When
>  operating cw, at the end of a transmission, the relay opens
>  but the received signal is knocked way down and a steady
>  tone is heard. This tone gradually fades away until finally
>  the full receiver audio is heard. I believe a second relay
>  contact opens as there is a slight click from the 401 and
>  the audio is restored all at once. The longer the
>  transmission, the louder the tone is initially and the
>  longer it takes to subside and restore full receiver audio.
>  Blocked audio can take as long as 10 seconds to be restored.
>  On short transmissions, such as a cq, the pair act normally
>  with full audio after key-up.
>
[clip]

>  Thanks for the help.
>
>  73
>  Gareth VE7CGG >>
>

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