HW-10 Shawnee

[Kathy & Buck Ewing]

Thanks for reply's. 

Web site mentioned had no mods for HW-10.

Receiver modulating transmitter when in AM mode:
 I'll try to keep this short to explain what I have found.. The recvr audio and mic amp
outputs are tied together at input to audio amp/modulator. When transmitting, the B+
to recvr is switched off and should kill anything from recvr. Enter the meter circuit.
When receiving, the meter monitors voltage drop across resistor feeding B+ to last
IF amp as a signal strength meter. When transmitting the meter displays a rectified
portion of the RF output as a tune meter. During transmit, a portion of this voltage is fed
back to the receiver B+ line and at about 3.1 volts the recver turns into one big oscillator.
Strange! Turning off AVC stops the oscillation as this opens the recvr B+ -- meter circuit
connection. This did not occur many years ago when I used the Shawnee (I hope not).
The RF output is significantly higher than I remember. Adding a diode between IF amp
and meter circuit stopped the oscillation. Forward biased when receiving and reversed bias
when transmit.

Receiver RF amp. Will align for lower part of 6m.

Buck Ewing 

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