I have built a couple of H-Per-Mite filters and used them with several rigs. I use one as an outboard filter with my uBITX. They are excellent filters nice sharp 200 Hz width and no ringing at all.

Thanks for your review, Bill. Did you modify your uBitx such as adding the AGC or a preset pod btw diodes? // hiro, JJ1FXF 2018/07/22 20:46、Bill Carpenter <nz0tham@...>のメール:

I have installed both of Kees kits - the click board and the AGC board. Both work very well.

Thanks Bill. I am going to mount mine inside the BITX case and switch it in/out. Coli – M5FRA

With my radio/engineering skills very much lacking, I probably don't even need to be trying to contribute to this conversation, but here is what I ran into on my build. My tx audio was very distorted

I found the filter in my ubitx to be about the same narrow range. As I work ssb and no cw I modified the filter circuit slightly. I replaced the 5 100 pf capacitors with some 82 pf capacitors and

You got it right. Raising the BFO frequency brings it closer to signals coming from the filter, which lowers the audio frequencies.. We have a BFO below the 12mhz crystal filter passband which mixes

Hi Jerry, That is a pretty good description. I have my BFO set so that the incoming signals start rolling off at 300 Hz just as you have described. A few decades ago when we were looking at

Greg, I ordered a few of the -24 dB mic elements from Mouser. I put one in a cheapo Baofeng speaker mic and it works great! The stock mics element was very weak the -24 dB element made a huge

HI Ken, Would you happen to have the mouser part number for that element ? Thanks, Kevin rea Lancaster, calif K6rea

It has been awhile (so I may not remember all the details) since I ran the uBITX manager, but I believe it did do checks for valid input. The display was split between a panel that showed the "raw"

Ken KF7DUR How weak were the stock elements you removed? I'm assuming that you measured the output on both the original and the new replacement units in order to have a good comparison. Arv

To reposition wire/contact in berg/DuPont 2.54mm connectors so the colors are correct:

for those new to PCB layout. Thermal relief pads are very important as they enable good solder connections where otherwise the heat from the iron would be drawn-away by attached surrounding copper.

Even more important if the boards are to be commercially wave-soldered. _._

Kevin, Mouser# 665-AOM-5024L-HD-R Digi-Key# 668-1596-ND MFG# AOM-5024L-HD-R Ken

Art, I didn't measure the output before replacing the element. I compared it to a microphone from a GE commercial radio and it was much lower with the original, now the audio sounds very close. Ken

Ken Thanks for the reply. I was wondering if there was a generic problem with elements used in the Baofeng microphones, or if yours was an anomaly? May have to order one just so I can test

On Sunday, July 22, 2018, 6:20:06 AM PDT, RCC WB5YYM <curtis03@...> wrote: With my radio/engineering skills very much lacking, I

This same W10 update issue (honey, I lost my comm ports) happened to me twice (how dumb am I?). Well the second time I was prepared and rolled back to the previous version.Rolling back is my