ATTENUATOR / TRANSVERTER INTERFACE BOARD WITH RF SENSE PTT SWITCH
This Transverter Interface & Attenuator board allows you to interface your base HF radio to the VHF/UHF Transverter. This board contains 30 dB Attenuator with the fine output power adjustment POT, RF SENSE PTT SWITCH and BYPASS / PTT relays.
When the Power Switch is set in OFF position the Attenuator Board is in HF BYPASS mode. HF antenna is connected to your base HF radio through the bypass relay contacts K2. You can operate on HF bands with full 100 watts output power of your base HF radio.
!!!! - BEFORE SWITCHING IT TO THE TRANSVERTER OPERATING MODE TO SET OUTPUT POWER OF YOUR BASE HF RADIO TO ABOUT 5-10 W - !!!!
To get it worked in the VHF TRANSVERTER mode to switch +12V Power Switch ON. Doing this your HF antenna is cut off from your HF radio by contacts of K2 relay and your VHF Transverter is set in RX mode connecting through the contacts of K3, K2, K1 relays to your base HF radio. Connecting PTT line to the GROUND brings your VHF Transverter into TX mode connecting its IF input through the ATTENUATOR to the output of your base HF Radio.
This Attenuator Board contains RF SENSE PTT SWITCH so you can even use it without PTT line connected to your HF Radio. Just push your HF Radio to the TX mode and RF SENSE PTT SWITCH instantly switches the Attenuator Board and VHF transverter to the TX mode. Do not forget to drop output power of your HF Radio to about 5 - 10 W !!
YOU CAN EASILY SWITCH OFF RF SENSE PTT SWITCH BY REMOVING JP1 JUMPER.
Download a copy of the manual there
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