Maesstro Mic2

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  • Updated 4 years ago

Maestro Microphone,

Trying to get a microphone hooked up to the Maestro.  I got the Maestro just before Memorial Day.  I ordered the adapter for the Radiosport headset that I also ordered from Flex.  They back ordered the adapter.  I called and talked to Matt that’s when he said the radiosport adapter was on backorder.   I had read on the community that there was a problem with using the RJ45 adapter he pulled up that post and said he had no idea what would work but he would check with someone and let me know.  Its been a couple of weeks now and I have not heard from him.


I tried the mic I have been using with my Bose headset and flex.  The 1/8 connector on it has 4 sleeves vs TRS.  When I use it with a mono adapter straight into the 6700 it works just fine.  I tried it on the Maestro with the adapter and get nothing without the adapter it keys the radio when plugged in. 


This is what I’m thinking of trying next Flex provided a RJ45 connector which I don’t need if I cut that in half and find the wires that go to pins 4 and 5.  Then connect those to mic + and – on the Bose mic.  The problem I see is the non shielded wires picking up RF.  Before I sacrifice that microphone I figured I’d see if anyone has a suggestion on a mic that might plug into the mic2 input and work.  I am on the road for 3 months and am currently in the Montana wilderness so not many places to shop.  I did fine a WalMart in Havre Montana but didn’t see anything there that didn’t have a stereo plug.




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roger na4rr

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Posted 4 years ago

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Roy Laufer

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I am not quite sure if your problem is identical to mine (

My problem was that the Maestro was not powering my RadioSport's electret mic, because the RadioSport supplied adapter was internally wired to not supply the DC power to the microphone. I would have to unscrew three little screws on the supplied adapter and change the setting of two hidden unlabeled slider switches. My other choice was to just swap the mic for a dynamic one (which I did).

The point of my post is that you should consider if your mic is dynamic or electret and if the latter, make sure that the adapter you intend to wire supplies the required DC to drive it.

All things being equal, microphone wiring is best shielded. We have all heard guys with RF artifact coloring their transmissions.
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Jay -- N0FB, Elmer

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Page 18 of the Maestro User Guide says the following:

4.4.6 Mic 2 Connector

The MIC 2 connector accepts a 1/8 inch (3.5mm) stereo (TRS) plug and provides an unbalanced microphone input with optional push to talk input. The connector may be used with dynamic or electret microphone elements. A software enabled 2.5V bias voltage may be applied to the Mic (+) line for electret microphones. See section 25.8, Phone/CW Tab for the details. CAUTION: Failure to enable bias on some consumer electret microphones may cause the PTT line to be asserted and key the transmitter.

I built a little "Radio Shack Special" project box that will take a 1/8 Mono microphone plug and a RCA phono plug for PTT and outputs to a TRS (1/8" Stereo plug) wired to match the above schematic.   I plug my Heil Proset 5 microphone lead into this box along with my hand PTT switch made from a hospital bed Nurse Call Button.  The headset speaker lead is plugged directly into the "Phones" connector jack on the back of the Maestro.   It works like a charm.

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Matt - KD5FGE, Employee

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Sorry for dropping the ball on getting back to you! The best cable to use for Maestro is this:

It will not require any rewiring.