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Sergio, In many bitx40 there has been bad solder in L1, L2 or L3. Please check with multimeter and resolder if required. In some the TRIFILAR transformer also have solder problem and some winding

Thank you, you're so kind Now I will try to do what you suggested and visually check all the solderings on the cards. Unfortunately I do not have an oscilloscope I confirm that he receives nothing!

I found a 1K to 10K resistor in the same place stops the instability. My first board at 0 volume used to growl !! Raj

John, HFsignals many times absorbs the loss and ships bitxs to USA by courier even if the buyer has paid for India post. I think this is because the local post office is getting overloaded. I

How and why does this mod work? What was the calculation that came up with 220pF and 27 uH?? For the inductor does it matter how many ma it can handle or what it’s self resonant frequency

I purchased a couple like this only in black. ?I think they were available in other colors, too. I bought them on eBay and I think I paid about $12 plus shipping for the both. ?Shipping was about

I really like your footnote quotation, Mike: Internet? Abraham Lincoln? :) 73 Dex, ZL2DEX

Discrete? Wonderful!? I'm wondering how many with blown TDAs have tapped off from the VOL pot to feed an external amp? Could be a? case for a 4-pin header: ... BITX amp ... o o ... Vol wiper ? ?

UTP is best for balanced circuits. It gives a minor shielding to single-ended signals, but its use there is mainly just for grouping, keeping 'looms' tidy. The copper bulk of multiple wires can give a

That’s what I’m talking about! Very nice job!

Hi Folks … I bought the same kind of case for my uBITX and found it a nice home for my transceiver. I bought a small switcher from Jameco (I know, switcher and noise and stuff … but I’ve found

100 nF in series between wiper pin and LM386...PERFECT!? Thank you!

To use this on any full carrier mode you would have to derate the output power significantly. From 10watts SSB to about 2watts on AM or FM. Even then you would probably have to significantly beef up

Mike, As always your work is exceptional. Love the TX-807! Every one of my Heathkit and Drake Power Supplies has your PCBs. Dave WI6R

I can imagine that many will find it easier to just buy them off the Internet, it may be a challenge for many others. While hf signals has always tried to buy the best components from trusted sources,

I find it interesting that the ubitx tunes well down past the AM broadcast band. Makes a nice AM receiver.

Well the AM part is very easy… not so much for the FM part. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton,

I wired my uBITX according to the diagrams I found at http://www.hfsignals.com/index.php/ubitx-wire-up/#content I just got it working this week. The only problem was a defective volume control

Dexter, the reflow with hot air worked fantastic.? I have a small craft style hot air blower and was careful with it.?? I have used it to unsolder a 18 pin surface mount IC.? Did you ever see

Don, WoW! This version works great. With the original I could never actually hear the noise level drop as strong signals would come on. You can certainly hear it now! You can hear the receive