[Drake] TR7 Audio Problem

Tue, 19 Mar 2002 16:41:26 -0700

Duane

For a high impedence crystal or ceramic microphone such as the Astatic Model
D104 the mic audio should be wired to pin 4 of the mic connector instead of
pin 1.

Tell your friend to check the mic connector

73//Ron K5MM
----- Original Message -----
From: "Duane Fischer, W8DBF" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 19, 2002 5:55 PM
Subject: [Drake] TR7 Audio Problem

>
>
> A friend has a Drake TR7 with an unamplified D-104 mike. The CW output is
good
> and the receive seems adequate. The match to the G5RV is good. The mike is
the
> correct impedence for the TR7.
>
> When he tries to operate in the SSB mode, the recieve seems to be slightly
off
> the indicated frequency. The audio quality of the transmitted signal is
thin and
> intelligibility is poor. Listening to it, it almost sounds off frequency
> slightly. Even tuning his SSB signal with rit does not clear it up much.
>
> Any suggestions as to what might be amiss? The balanced modulator?
>
> The transciever has been professionally refurbished and checked on the
bench. It
> was not tested on the air by the man who did the work, being as he is not
> licensed above a Technician.
>
> Your thoughts and suggestions would be appreciated. I will foreard them to
the
> gentleman with the troubled TR7. Thnks so much.
>
> Duane Fischer, W8DBF
> [email protected]
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