Broadband PoC transceiver accessories & accounts.

For most operators that are content running VOX the addition of the PTT function to the jack won't hurt, but to those that will have a situation requiring true PTT keying - it would be a blessing and the fact that it isn't there would be a problem that would have to be overcome for proper station operation. To that very point - and to the OP's question with PTT through the data jack on the FT-450 - I would be curious why there aren't commercial cables to do this. There is a stark difference - and justifiably so. However, do not confuse VOX activating a transceiver to transmit with true PTT function. If you are using a stand-alone radio and don't ever plan to have any of the above set ups - then VOX will work. Hot-switching can arc contacts, burn out coax relays, blow out preamps, and burn up radios. You want the switches to move to the transmit positions prior to turning a transmitter on so as to not cause hot-switching. If you are using receive antennas and/or preamps and have coax relays to switch the devices that are activated via PTT. If you rely on VOX with an audio stream you have no way to spread out the keying of the amp prior to the transmitter.Ģ. If you are using your radio with an amplifier and you want to use sequential triggering of PTT so as to put your amp in transmit mode an instant before the radio is tripped to transmit. There are two circumstances that immediately come to mind:ġ. It uses the audio from the computer as an external VOX device to then trigger the PTT circuit.įor most ham radio purposes VOX can work. You don't set up a COM port (with RTS or DTR triggering of PTT ) because it doesn't have that ability in it. The Signalink interface I referenced above is a common device. VOX takes audio signal that, once it surpasses a particular gain threshold, will trigger an electronic circuit to artificially trip the PTT circuitry/function. PTT is a physical switch to trip the transmitter (either by closing a circuit with a push button or switch, using an electrically controlled relay or PIN diode, or a port on a radio that can receive a hot signal/positive voltage). Just a point - VOX, whether internal to the radio or external in an audio interface (Signalink for example) is not PTT.

Ftm-7250 d setup