Switching reception-transmission in CW mode. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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While operating the Drozdov transceiver (RA3AO), I encountered one drawback. When connecting an external power amplifier with a mechanical antenna relay, there were difficulties with switching "reception-transmission" in CW mode. The antenna relay connected to the QSK circuit operates in time with the manipulation, which is not always convenient. By applying the scheme below and making minor changes to the transceiver circuit, we managed to get rid of this drawback.
In the diagram of node A19, a KD9 diode is connected to the VT17 emitter in a break in the conductor connecting the VT503 emitter to pin 9. SA1 in the diagram is an Rx-Tx pedal switch.
Author: A.Sandov (UC2WCB), Polotsk; Publication: N. Bolshakov, rf.atnn.ru
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