You are playing with fire!
By the time the RF is sensed, and the relay switched, you will probably damage either the rx of the big rig, or, the tx of the handheld, or both.
Seperate rx and tx setups use what is called a sequencer, to delay the transmission of rf untill the relay is safely switched.
Unfortunatly, there is no way to interface a sequencer to your setup.
Best to stick with 2 antennas.
On 70cm SSB I use a hf rig driving a Microwave modules Transverter, a mast mounted preamp, and a solid state linear.
When I transmit, the sequence is as follows:
2-Preamp turns off
3-Changeover relay switches
5-hf rig keys, and rf is generated
The steps are seperated by about 50ms
When I let go the PTT, the reverse happens
1-hf rig un-keys, and rf stops
2-amplifier drops out
3-changeover relay switches back to rcv
4-preamp turns on
Last edited by AI3V; 10-26-2009 at 04:33 PM.
Now my mistakes travel at the speed of light!:cool: