There is nothing simple about this, because you need to avoid hot switching. This means that you need to start with the rig signal that is intended for use with QSK linears. This signal will change to the transmit state 10 ms before the transmitter actually starts putting out RF. The name of this signal will vary depending on the rig, and the "PTT" signal may or may not be the correct one. Additionally, in some rigs you may need to put a switch in the QSK position (such as the FT1000).
Once you have a 10 ms head start, you need a relay that will close in less than 10 ms. If necessary, you can use speed up circuits that put a temporary overvoltage on the coil of the relay. This requires that the relay is energized on TX and non-energized on RX, rather than vice versa. In keeping with the word "simple": a piece of hook up wire running to the base of the antenna is much simpler than trying to send DC on the coax, depending on how hard it would be to install this wire. You can still use the shield of the coax as the return connection. Rick N6RK On 9/23/2017 5:39 AM, MR TREVOR DUNNE wrote:
Hi All Can Anyone tell me a simple way to switch a 12v relay at the base of an antenna using the rigs ptt as the trigger?? Thanks Trevor EI2GLB _________________ Topband Reflector Archives - http://www.contesting.com/_topband
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