with no.1 h.f. system transmitting the interlock circuit
- does not allow no.2 to transmit or receive
- allows no.2 h.f. to transmit and receive
- allows no.2 h.f. to receive only
Explanation
When one HF transmitter is keyed the interlock inhibits the second HF system so it can neither transmit nor receive. This prevents the high transmitted power of No.1 from damaging or desensitising the closely located No.2 receiver and avoids mutual interference between the two systems.
nairs asking:
VHF CAN RECEIVE WHY NOT HF?
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