[Drake] sidetone in T4XC

[Garey Barrell]

Joe -

The sidetone is fixed frequency.  The RC phase shift network determines 
the frequency, which is chosen to supply a clean "single-tone" for TUNE 
mode.  The sidetone frequency should be about 900 Hz, which is the 
approximate carrier oscillator shift to put the carrier within the LSB 
filter passband for CW operation.  Apparently someone at Drake believed 
the old "approximately 1 kc tone" for CW myth.  Really not much to be 
done at this point.  I just keep the receiver ON and listen to my own 
signal or use the sidetone in the keyer.  The receiver can handle it, 
and the AVC keeps it in check.

73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>



Joseph Trombino Jr wrote:
> Put my Drake C-line on the air in the CW mode for the first time today 
> for SKN and notice that the sidetone frequency is very high.
>
> It looks like V9 in the T4XC is used as the sidetone oscillator...I 
> didn't see any way to vary the frequency...is the sidetone in the T4XC 
> fixed frequency??
>
> If so, any ideas on how to bring the frequency down to 700hz or so???
>
> Thanks for any ideas or suggestions and Happy New Year to the Drake list.
>
>                            73, Joe W2KJ
>
>