Dick -
Congratulations! Always nice when one 'behaves' again.... :-)
The TR-4C works a little differently in CW/TUNE than the T-4X(any).
Essentially the Carrier Oscillator is shifted by about 800-900 kHz to put it within the passband of
the LSB filter. A 750 ohm resistor (R72) is inserted in series with the Screen supply for the PA,
limiting the Final plate current. The Balanced Modulator is unbalanced by a DC voltage derived from
the XMTR GAIN control and the audio oscillator (V2) is fed to the SIDETONE & VOX functions.
The biggest difference is that the audio oscillator is NOT applied to the Balanced Modulator to
generate the TUNE signal as in the T-4X(any). The Screen voltage to the PA is also reduced in the
TUNE mode, but NOT in the CW mode.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-B, C-Line&
TR-4/C Service Supplement CDs
<www.k4oah.com>
Dick KF4NS wrote:
I DID IT ! I DID IT ! I DID IT! HAPPY DAYS ARE HERE AGAIN! Please
excuse my slurred speech but I just finished a bottle of champagne.
hi,hi
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