Is this possible ? GP300 Accessory (throat mic) on a GM338

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mrtor
Posts: 171
Joined: Tue Apr 08, 2003 10:33 pm
What radios do you own?: Analogue, Digital x lots

Is this possible ? GP300 Accessory (throat mic) on a GM338

Post by mrtor »

I am doing a sport event shortly and the requirement is for stable comms on a motor bike.
I have used throat mics before on a portable, but now they want to use a mobile radio in the panier bag with an external antenna.

Is it possible to wire up a throat mic designed for a GP300 (ie the 2 prong plug) to connect to the 16 pin accessories connector or a combination of that and the front RJ45 mic socket ?

I have had a quick glance at the Gp300 speaker mic schematic on batlabs and it shows the PTT appears to be triggered just by completely the MIC + into the circuit. Obviously on a GM338 I need a seperate PTT line shorted to ground to get it to transmit.

My throat mics have an inline PTT switch.

Any help appreciated

Thanks in advance
Mike
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mrtor
Posts: 171
Joined: Tue Apr 08, 2003 10:33 pm
What radios do you own?: Analogue, Digital x lots

Re: Is this possible ? GP300 Accessory (throat mic) on a GM

Post by mrtor »

mrtor wrote:I am doing a sport event shortly and the requirement is for stable comms on a motor bike.
I have used throat mics before on a portable, but now they want to use a mobile radio in the panier bag with an external antenna.

Is it possible to wire up a throat mic designed for a GP300 (ie the 2 prong plug) to connect to the 16 pin accessories connector or a combination of that and the front RJ45 mic socket ?

I have had a quick glance at the Gp300 speaker mic schematic on batlabs and it shows the PTT appears to be triggered just by completely the MIC + into the circuit. Obviously on a GM338 I need a seperate PTT line shorted to ground to get it to transmit.

My throat mics have an inline PTT switch.

Any help appreciated


Sorry to bump this but I am now getting desperate
I spoke to a local MSS today and they have quoted me $450 each to do

Surely it cannot be that hard ???

It,s the gp300 ptt thing that throws me because the audio and the ptt go to a 2 pin 3.5mm plug

help me please some kind person :-)

Thanks in advance
Mike
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Will
Posts: 6823
Joined: Tue Sep 04, 2001 4:00 pm

Re: Is this possible ? GP300 Accessory (throat mic) on a GM

Post by Will »

Mike,

I sent you a diagram for an adapter to use GP300 two prong headset on a GM mobile radio. It has the PTT circuit.
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mrtor
Posts: 171
Joined: Tue Apr 08, 2003 10:33 pm
What radios do you own?: Analogue, Digital x lots

Re: Is this possible ? GP300 Accessory (throat mic) on a GM

Post by mrtor »

Will wrote:Mike,

I sent you a diagram for an adapter to use GP300 two prong headset on a GM mobile radio. It has the PTT circuit.
Thank you Will

Works a treat

Much appreciated
Michael
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