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Use an RF probe or oscilloscope to trace the signal through the relays / filters. Clark Martin KK6ISP

Excellent line of investigation to follow.? Having replaced the finals (from Mouser) with predictably no change, I swapped out the Nano. New, known supplier, etc. No change. The relay power at K1 -

Jerry, Thank you; I'll try those steps. 73, Mark/WU6R

Mark, So, you measure 12v across the power supply and at the same time you measure 0.49v across the Bitx40?? Then somewhere there is 11.51v drop across a bad connection, you should be able to find

ThanksI'm using the resistors that came with the kit. At 81 I think I'm Loosing It.73Jim

I have a never used - never powered uBitx version 3 board available for sale for $50 plus shipping - US only. If you ever wanted a spare, now is the time. First come, first serve. I accept payment by

Hi Allison, i did get the prebuilt band pass filter from ebay.? Wondering if you have any suggestions to mod the KL-203 as well as how to mod it to be more sensistive to lower power e.g. from

I did get the KL203; not bad of course low pass filtering is required.? It works with 20m up. power mod is required and will make it once i get the caps 1200pf/50v for C14. For softrock no lock; SSB

Yes agreed. I got it but no luck - the power from softrock is too low to trigger the amp to transmit. Not sure if anyone knows how to mod it.? If I use AM,? it does trigger the amp. Sajid

Like Ian, I think the uBitx main rail is a good candidate for a series diode. We don't care much if we lose a half volt there. The hfsignals.com wireup diagram shows a shunt diode that conducts if the

Hi all Possibly interesting for people with an Antuino who want to check the calibration; or many other pieces of test equipment - I built an interesting 7MHz signal generator with very accurate 0dBm

Adrien, * feel that t is not a good idea to switch the negative power like you ask abot.* * A: is not the common practice.* * B: if the B+ (12 VC) and the PA + are different voltags, there is, IMO, a

Thanks MikeJim

The bench power supply is outputting 12v and 2 amps, but at the bitx the voltage drops to 0.49v -- 73, Mark / WU6R mark.wheeler3575@...

I double checked for polarity being backwards and it is wired correctly... -- 73, Mark / WU6R mark.wheeler3575@...

The diode is there to "protect" against reverse polarity and as it is wired directly across the supply and reverse biased,the circuit will effectively short circuit the supply if the supply is

Nothing terribly wrong with what you have done, seems better than most I've seen described here. But I'd have a switch in line with the PA-PWR, as you suggest. When the power switch for the rig is

Putting things like diodes and switches on the ground return back to the power supply is a bad idea.? There are many other ways that the ground return could be completed. For example, some power

I recently wired up my uBITX. I've attached a photo that shows how I wired up the DC socket with some fuses. I used two fuses: one 0.5 A fuse for the main board (red wire) and one 2.0 A fuse for the

Relay K1 has 12v connected to Tx or Rx.?? You can get it off the schematic anywhere Tx or Rx is connected. Use a current limiting resistor for Led indicators. Mike, WA6ISP