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Count me in on 2 please Regards martin VK6FEEE

Well, I am late to the party but I was listening on 7.277 an came running to receive QRM on 7.276. Did we ever agree on a secondary? And I just heard W1LY LOUD and CLEAR trying to contact the QRM in

I looked at figure 15 of the LM340 datasheet, the "shorted input protection diode" is in parallel with the regulator, not in series with it. The diode addresses a weakness of the LM340: ?if the input

It appears the way you have wired it may be causing a double paraphrase short in the transgronifier. I would suggest a dual direction high Mu diode to enable a neutron acceleration lane. v/r Fred

Even better go through a fuse and have a standard diode between the fuse output and ground. If reversed the diode causes the fuse to blow. Another cure is to feed the input to a bridge rectifier and

From post?/g/BITX20/message/27483 ( /g/BITX20/message/27483 ) That last line should be all you really need to know. Looking at the schematics, the end result is that

Hi Bill, I have a stock Bitx 40 waiting for me to get back into the shack to mod. My other hobbies are taking my time ... well that and work :-) I also have one of Jacks boards and ordered an other

I've tried several old versions here on my own BitX40, but I could'nt reproduce your findings. I can't hear any noticable difference with regards to the tuning clicks or noise from the Raduino. So I'm

All you would need is a good ear. Tune in an SSB station, then fiddle with the new trimmer and the regular tuning control for best sounding audio. ?That best sounding audio will also show up in your

So... for the rest of us, can we (please tell it to me like I'm 5, with specifics) remove D7 and reapply it someplace where " D7 would give the reverse EMF of the K1 coil someplace to go when the PTT

Over the past 24 hours, Jack and I have been in contact off-group about the possibility of setting up a VK source for the W8TEE BITX40 VFO etc pcb, one that could also be accessed by our cousins in

So in order to know which value I should use i should have equipment such as an oscilloscope... i may return to previous values... a shame i already removed the smd cap

You can still get rosin core solder. Using that stuff is like burning incense.? If vaporized lead has been an issue all these years, I'm done for. Could explain a lot. Jerry, ?KE7ER

Changing the capacitance at C102/C103 will adjust the frequecy of the BFO, , typically at 11.998500 mhz. Farhan found that with 47pf at C102 and with all five 12mhz crystals matched, the BFO was

if you have place your Bitx40 for 7.0000 on display and you han a reading about 5 MHz just say ( reading*5 ) and place result in this line : ?si5351.init(SI5351_CRYSTAL_LOAD_8PF, 24994650L,0); (

Thanks much, I didn't realize they were that inexpensive. Might add a light and magnifier to the one on an adjustable arm. "Re: Solder fume filter From: David McGough Date: Sun, 11 Jun 2017 17:13:08

These are the best "cheap" filters I've seen--adequate for casual work. I've got models similar to both of these. http://www.ebay.com/itm/391024007986 http://www.ebay.com/itm/131996210966 They're

Any suggestions for a cheap, effective benchtop solder fume filter. ? Currently I use my bench in the garage but I'd like to move into the house. Of course to do this I have to be smoke and odor

I have noticed that when intouched with the tester probe into the the sound from the speaker become louder. So, i decided to try this mod that Peter showed o his video https://youtu.be/IELJwapv5qsp (

Jonathan KK6RPX wrote... I ordered a BITX40 on June 2. It will be used on Salt Spring Island, BC. It was after ordering a hot air soldering station that I started looking for SMD QRP kits that I came