The value of the pots is not critical. Log/Audio taper for Volume and Linear for tuning. As noted above, the middle tab of the tuning pot may not be the wiper - particularly if it's a 10-turn - and yes 10k works well there, but if watchagot is greater 10nF wiper to ground bypass..
73
ZL2DEX

开云体育

开云体育

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.

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?

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-?

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...?

Website shows grey case out of stock.

Can I expect this case to be back in stock with a few days??

?-Tom, W3TLN

Code, which is still being modified can be found at?.?

This one is going to be base station at home and won't be moving.? I've already got plans for another one to go mobile :P

Rich,
Before you go to the work of designing and building your case, consider the pros/cons of using a larger and stronger mechanical connector for how you see yourself using your uBITX and the size of the coax you will be wanting to attach to it.
Since the UHF connector has been the defacto standard in HF/VHF for so many years, there are many inexpensive screw on adapters. If you chose a UHF SO239 connector for your uBITX, you have a solid mechanical solution to screw on an adapter to BNC, SMA, type F (for your surplus Sat TV coax). etc.? Compromise, but flexible/adaptable.?
The cost of type N connectors and adapters is also coming down so this may work for your situation too.
Again, just another viewpoint to consider.

Rgds,
Gary

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.

Please add me to purchase your kits thanks?
KE7GO steve