QRM Eliminator connection

[Greg T]

Alright, I know this is going to be a rookie question, but never having played with these I'm ignorant. There is a pigtail with the QRM eliminator that is a 3 wire. Red, Black, White. The instruction are fairly clear on the 12v supply of red and black, but th4n it says to connect the white to the PTT port on the back of the radio. Well, I don't have one on my Stryker, and it says in the booklet to NEVER connect the wire to the mic connection. So, the obvious question. How do I connect this box to my Stryker, and what is going to be the ground wire?

 

[nomadradio]

Sounds like it's designed to work with a ham transceiver that has a linear-keying relay and a jack for it on the rear panel to connect the white wire. We sell an add-on relay for base radios that adds this feature, but fitting inside a mobile radio is ifffy.

JUST DON'T CONNECT THE WHITE WIRE TO THE TRANSMIT PIN ON THE RADIO'S MIKE JACK.

Yeah, I was shouting. Odds are the relay inside the QRM eliminator runs from 12 Volts more or less. The wire that keys it will have 12 Volts on it. Most radios don't tolerate having 12 Volts pumped into the mike socket's transmit pin. You will croak the CPU if you do that to a RCI computer-display radio.

One way we did this in old tube radios like a Browning AM-only transmitter was to put a RCA jack on the back panel with a NPN transistor like a 2N2222 connected collector to the center pin, emitter to the chassis ground. A 220k resistor from the transistor's base lead tapped off the B+ to the crystal-oscillator stage. This socket was to activate an external VFO either when you keyed the mike or pushed the SPOT button. The NPN transistor would close a circuit from the center pin of the jack to ground while transmitting. There's probably room for that in the Stryker, but with 10k or so resistor from the radio's internal transmit-only voltage to the transistor base lead.

The eliminator's ground wire will go the radio power cord black lead.

73

 

[Greg T]

Sounds like it's designed to work with a ham transceiver that has a linear-keying relay and a jack for it on the rear panel to connect the white wire. We sell an add-on relay for base radios that adds this feature, but fitting inside a mobile radio is ifffy.

JUST DON'T CONNECT THE WHITE WIRE TO THE TRANSMIT PIN ON THE RADIO'S MIKE JACK.

Yeah, I was shouting. Odds are the relay inside the QRM eliminator runs from 12 Volts more or less. The wire that keys it will have 12 Volts on it. Most radios don't tolerate having 12 Volts pumped into the mike socket's transmit pin. You will croak the CPU if you do that to a RCI computer-display radio.

One way we did this in old tube radios like a Browning AM-only transmitter was to put a RCA jack on the back panel with a NPN transistor like a 2N2222 connected collector to the center pin, emitter to the chassis ground. A 220k resistor from the transistor's base lead tapped off the B+ to the crystal-oscillator stage. This socket was to activate an external VFO either when you keyed the mike or pushed the SPOT button. The NPN transistor would close a circuit from the center pin of the jack to ground while transmitting. There's probably room for that in the Stryker, but with 10k or so resistor from the radio's internal transmit-only voltage to the transistor base lead.

The eliminator's ground wire will go the radio power cord black lead.

73

Hhhh.mmmm.. appreciate that. I was wondering how they triggered that. Looks like I'll just be rocking the switch back and forth to transmit