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Hello.

I'm building a Bitx40 (v3 board) in an Amateurradiokits.in Universal Blue II case.? I'd like to use a Baofeng Mic with this build.? I have a couple of questions.

Question 1:
The Baofeng mic connector has 2.5 and a 3.5 mm connectors on it, the Bitx40 and case kit both came only with 3.5 mm jacks.? I bought a 2.5mm jack but it's to small for the mounting hole on the case.? Is there some place to get a 2.5mm jack which fits in a 3.5 mm mounting hole?? The case was advertised as having the connector mounting spacing to accommodate a Baofeng mic, but I don't see how it's supposed to work with the mounting hole sizes provided.

Question 2:
The Sleeves on the mic and speaker jacks will make contact with the metal case.? Is that a concern at all?

Question 3:
Based on the answer to question 1 I may decide to modified the Baofeng mic using the method described by John McGrath (KF6EFG) found here.



This means I won't be using the speaker in the Baofeng at all.? I'm fine with this.? One question though.? Can the Mic and PTT GND be common so I can use a single 3.5mm stereo jack (tip, ring and sleeve)?? Also same question as before, is it a concern if the sleeve is shorted to the case?

Craig (VE6TBW)

I run a stock mic on a normal stereo 3.5mm jack. The PTT and mic are on the same neutral.

Perhaps you should drill another hole to get your 2.5mm receptacle to fit or put a washer on the receptacle that is loose.?

I used a Baofeng mic on my ubitx. Just cut off the connector and fit a 3.5mm stereo jack. Gnd for ptt can use the same gnd as the mic element.

Carl,? if you tell the assembled mob what wire colour you wired where on the plug ie Tip , centre , rear? and what the functionality was I am sure you will get some high fives from those who don't have docos on that brand of? Mike.

Timothy,

I no longer have that mic as it ws sold with that particular ubitx months ago.

What I did was replace the electret element of the baofeng with another I had which was more sensitive. I just hot glued the new one in. I remember removing resistor r3 from the board on the ptt button path. I then used the stock ptt button which will short to gnd at the solder pads when pressed of course. I did away with the internal speaker. I soldered 2 wires to the new electret and soldered one to gnd pad (M-) and the other to pad M. And there you go.?

Simply you want in the mic a ptt to ground for keying the radio and wire to the electret element for audio, obviously another wire to the element for ground too but that can attach to the same place as ptt ground.?

I’m using a cb style coffin mic now. This has a separate switch inside which alows the ptt to ground when switched and bring in the mic circuit. When depressed the mic element is completely cut out of the circuit too...?

Also If yu are to use the stock mic element in the baofeng mic its even easier as there is no need to run any wires up to the element like I did. So just use the solder pads m and m-?

Hello

Thank you for all the info.? I think I'm going to go with modifying the Baofeng mic by completely removing the speaker, replacing the existing electret mic with the one that came with the Bitx40 kit, and cutting off the current male 2.5/3.5mm end and replacing with one stereo 3.5mm jack.? I'll put the common gnd for the mic and ptt on the sleeve.

I'll use the speaker that came with the amateurradiokits case.

One thing the sort of confuses me.? Why don't I need to be worried about the sleeve shorting to the case?? Is the case at gnd potential somehow?

I made up a patch cord that had 2 connectors for the Baofeng mic which were terminated with a 4 pin connector. I did this because I didn't want to cut the Baofeng connector off in case I wanted to use it with the Baofengs that I have. ? I only use the mic side as I wasn't interested in the speaker in the Baofeng since I have a speaker in the case for my BitX40.? I was also able to test a Kenwood handheld speaker mic using the patch cord to compare audio quality of both mics.?? For whatever its worth the Baofeng had low frequency response even after I made the hole for the mic larger.? The Kenwood speaker mic sounded better.?? The best audio quality was with the mic element that came with the BitX40.?? I installed that into a Cobra CB mic.

Jim,

My findings exactly. This is why I used the ubitx supplied element instead of the Baofeng one, and the same with my current cb mic...?

I'm suspecting the Baofeng mic relies somewhat on its housing and input circuitry for audio tailoring. BitXes don't - they're essentially hi-fi until the modulation and RF filtering, a possible reason the supplied element works best.

'noddling', ZL2DEX