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Good morning Jerry and the group, Had to stop last night, having probed for nearly 10 hours. Jerry, my trouble shooting is hampered by not having an up-to-date schematic. My board is a Bitx40 V3. It's

The current drawn will depend upon the peak to average ration of the voice characteristics which is different for every individual. That is why a speech processor would be a great help to maintain a

It is standard practice that to eliminate any source of noise the decoupling has to be as near the source as possible using capacitors suitable for the frequency/ies involved. This also aids

Hi, Has anyone had any success in getting the bitx40 running with VFO at 19Mhz? I tried last night and observations were: Drive out of the raduino needed to increase to 4ma before any noise came out

You will find a single 12Mhz xtal with some components next to the 860 - thats the bfo. 73 Raj

Hi? John , I?? agree with the explanation for 100% . This is also my ecperience Marco , France

Hi Jack, Slightly off-topic, but may I ask what enclosure you are using ? regards and 73 Leo de Blaauw - PD1LDB

Hi, I'm having a bit of trouble locating the BFO on the bitx40 board to take some measurements. From looking at the circuit diagram it seems to be around the LM386 or D15, is that correct? I'm just a

I have been advancing the silver trimmer to the point of achieving a amp meter reading of 1 Amp plus a little bit while speaking up into the mic. Is this overdriving the BITX 40? I have found that it

John, The two section low pass filter is a standard across a number of transceivers build and sold in the USA. Our harmonic suppression is just within the legal limit. Here is the scan as I had

The center tap that takes the audio from the mic. A caveat though, the carrier is on the skirt rather than in the center of the filter. - f

4.7K resistor from center tap of R106 to 12 volts? 73 Ken VA3ABN

I used a 100pf ceramic 50V cap that tested out to be 87pf. It did not blow up. But I have no way of testing it. I'll just have to trust that the second harmonic solution will keep me legal. It was

With Allison's permission, here is the message to EMRFD regarding the BITX. This is good information from a master RF engineer. john AD5YE "Some thoughts on improving the bitx... First so there is no

Try a 001 cap from the regulator from input and output to ground Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 Sent: Sunday, February 19, 2017 5:51 PM To:

I am using a 2 3/4" x 4 3/4" oval 8 ohm 15 watt Sony TV speaker. It sounds great with the 1uf cap left on the board by the LM386. Sounds good like a 4" CB speaker. Plenty of power for a bookshelf

Nice mic!

Update: Mine still does that quiet clicking thing. It's just less prominent now. And still jittery on last digit, like I said.? And I wanted to check the current draw of the PA with the 20V supply. I

There was discussion of "Tuning clicks" before. My Raduino had this and also the jitter on the last digit. I would describe it as a rustling noise rather than clicking. I tried caps around the 7805

Did you enable the analog vfo by adding L4? If the tone is still there with no vfo, that's a hint