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Got it, Ralph. I will try to find a regulated, noise-filtered 12V 3-5A power supply today. Thanks for your specific advice. // hiro, JJ1FXF 2018/06/30 4:53、Ralph Mowery

Good morning, Bill and all. Thanks for your words. Well, I could sleep well. :) This is my first time to build up a transceiver in my life. uBITX really gives me a exciting opportunity that I

Three diodes won't fix the problem that the bias on the base of Q73 is highly dependent on Q71 collector voltage. If you ever redesign this circuit I would use capacitor coupling from the collector of

ian or anybody, I am trying to locate the actual source of Ian's files for the NEXTION displays to download. I have looked over Ian's web pages but just cannot find? a link to the files. Any ideas?

Thanks John, glad to hear you like the software. 73 Allard PE1NWL

“DId you parallel the emitter resistors too?“ A: R87&R88? No, I was not going to, have not done anything yet but order the 2N5109. “my 5109s wanted to sit there at 70ma and get very warm That is

Hal I ordered mine (6/21) and this morning (6/29) received notice it departed on DHL, estimated delivery (7/6) David KG7WFM

adjust resistor if needed for not more than 30mA emitter current. DId you parallel the emitter resistors too? FYI it should work as IS but my 5109s wanted to sit there at 70ma and get very warm That

Hi, I'm using batteries..even with some of my vacuum tube gear. What noise? 73, Bill KU8H -- bark less - wag more

I have a v3 & v4 and am "tickled to death" (American slang expression) with both of them. NO mods (except KD8CEC mods to one) so far except for a tiny 5v fan. As a retired engineer having done design,

I confirm my 2A was not enough and shut down. Use at least a real 3A, linear is better to avoid any issue you might not even a clue.

Intermittent issues are hard to diagnose because they never show up when the technician is looking for them.? You have to force the issue.? As you check for continuity, you wiggle and flex the PCB

The other thing you can do if you don't have a 5A or better supply is turn back the drive to your finals. Dan, W2DLC

If you don' want to deal with RFI problems from the power supply, then get a good analog? supply like the Pyramid PS12KX.? I have a couple of switching supplies that were made for use with

Not yet. We are getting bids on the complete assembly of the PCB, so that all the SMD's are in place. We do know that the Teensy 3.6 is $30 and their audio board which piggybacks on the Teensy and we

Re predriver (Q911, Q912): ”The 5109 was best even though I used only 1” So, the question is: If I use a 2N5109 for the predriver?“Should I also change some resistors to adjust the bias? Or

I don't know anything about those. They do say for using with LED strips only. Most likely they are not regulated and will put out over 12 volts with a light load. Another thing is they are probably

Hi,? The receive on my ubitx has gone very intermittent! One minute everything is coming in strong then all of a sudden it drops out and stronger stations are in the noise then back again. More often

Hello Hiro, I understand about the excitement. I had a dreadful time resisting the urge to power mine up on a sheet of cardboard (for insulation) before I formed the case to fit. I did connect power

Hi Mark, I laid out and folded a case of steel for my ubitx. Looking from the front, my antenna connector is at the far right rear corner and the internal connector wire is less than two inches long