My buddy’s VFO died and stopped tuning after he soldered thecapacitor onto the tuning pot, he left the pot connected to the VFO while doingthe soldering. The fix was to swap A7 and A6 in the

Here is the fix that I used and it worked for me. Reduced the power dissipated in the LM7805 on the Arduino VFOand eliminated the tuning clicks. I mounted the LM7809 to the side of myenclosure

There are some additional Bitx videos on you tube. One in particular is Randy K7AGE on building a QRP dummy load for those of us that don't have an accurate power measurement device. It is modeled

Just got my bitx40 together and when I turn it on it'll tune down in frequency a little bit and stay there. See this video: https://youtu.be/2N5pLJ1sjzs Adjusting the tuning pot does nothing. I've

In fact, I remove the back lit supply from regulated to shifting to unregulated with slightly higher resistor for current limiting. Thus the load on 7805 reduces. -- Regards Sarma

Everyone complains on the display regulator. Heat sink, a preregulator or a small high wattage wire wound resistor to drop some of the voltage will spread out the heat. Best remove the regulator and

The issue is not the software - the simple fix is to decouple the power supply for the Arduino based VFO from the BITX40 radio board. I can not claim to have developed the solution, but have found it

Ok I will reset it to 100mA PA current. One think I don't like is the regulator on the display. That's getting to hot for my liking so I'm going to put a small heat sink on it. Sent from my iPhone

Paul, Set the idling current AT the final power plug to 100mA. If you set more it runs hot. I suspect you mean 300mA for the whole board. Cheers Raj

Hi folks. I made my first QSO on the BitX40 over the long weekend, operating portable out in the bush from a battery. The received quality was very poor on both QSOs I managed to get, 5/1 and 4/1. I

I just sorted my Bitx 40 put with no TX. One problem was me as I just forgot to connector the 12 volts to the PA but that was not the end of it. Still no TX. I tracked it back to the bias pot. 5 volts

I literally wrote the connections down on the back of an envelope. I will open up my radio and figure out what I did.

I made the connections from the BitxX40 to the Baofeng microphone without any modifications. It works perfectly, and I don’t know why anyone would go to the trouble of rewiring the mic if it

Hi, I am also using a Baofeng microphone on my BITX40, it is the microphone designed for the UV5R that I also have. I use the microphone "as is" - not modified. This way I can use the microphone

My radio has the same problem. I have spend a lot of time but haven't nailed the source of the problem. My only suggestion is find a friend with same board and test your board in their enclosure and

Hi Steve. I know what you mean. I did do some simple programming but it just didn't rock my boat like RF does but I agree with I will have a go with this one as I can see there are some many things I

On 18/04/17 13:43, Jack Purdum via Groups.Io wrote: Coding, or writing something detailed and complex from scratch is a fairly daunting task, but altering a few frequencies in a table or

He's absolutely right. Anyone who has the brains to get a license is smart enough to program. I honestly believe anyone who wants to program, can. Jack, W8TEE From: College Professor Simon

Check out this post: https://groups.io/g/BITX20/message/23640

I had a ZX81! Basic Rules!