Batboard

Hello out there!

Maybe Iam to silly, but I didn't find information about the pinouts at the HT1000 radio.

Can anybody help me?

And by the way, is it possible, to use a usual speaker-mic, maybe with some modification, or must I use the expensive SM from Motorola?


Thanks for the help!

Most of the aftermarket spkr/mics will not work or work very poorly on the Jedi series radios. Go fpr the real thing, about $75, you will NOT be sorry. Check at BatLabs for the pinout, be carefull the speaker can not be grounded or you blow up the radio!

Check at BatLabs for the pinout, be carefull the speaker can not be grounded or you blow up the radio!

Although an old thread (2002) this appears to be related to the issue I have now. I have HT1000s that I need to interface with motorcycle headsets (J&M to be specific).

According to the following link and diagram http://www.batlabs.com/visar.html
http://www.batlabs.com/images/jedimic.gif

the circuit diagram for a speaker mic that connects to the 3.5mm stereo with screw base is very simple, so it should be easy to connect up a motorcycle helmet headset.

thanks,
amwadley.

So the two questions I have are

1/ Are motorola external speakers (as in this speaker mic diagram) high impedance (not your usual 8 ohm speaker)? If so that would explain why I have very low audio at full volume at present.

2/ can anyone confirm the values of the parts here indicated i.e. 4u7 is 4.7 microfarad (isn't this a bit high?), 56R is 56 ohms, 104p is 104 picofarad.

Interestingly an old 2 wire surveillance kit I have (broken, no speaker parts) has a 75K resistor where the 56R is in this diagram - I thought that was strange.

104p is 1 with four zeroes after it, i.e. 10000pf or .01 uF.

When using the 3.5mm threaded jack on the speaker mic plug to the HT1000 radio, the earphone audio is going thru both a capacitor and a resistor. Also the audio output on a Jedi is a bridging amplifier, both sides of the speaker are HOT.......
When the 3.5mm accessory/earphone jack is used, only one side of the audio amp is used, thats why the capacitor and resistor is in the speaker mic plug. The PTT is on the speaker line also.
Even on the Visar, you only get one side of the audio amp to drive the speaker when using the 3.5mm jack on the radio. 1/2 the voltage from the audio amplifier = 1/4 the audio output.

Best to use a old speaker mic plug and wire the helmet speaker and mic plus the PTT into it.