I'm with Arv, I don't see what's funny. Getting kids involved with making toroids is a good idea. Winding a toroid is a fulfilling process, you can see instantly whether you've done a good job or

Introducing kids to ham radio is a great idea, but the thought of them winding toroids I found funny. -- 73 Rick, W2JAZ

Thanks Andy, will have a look for it. I seem to vaguely remember seeing the thread some time ago. Hi Jakob, I'm getting about 0.5w on 20m and about 1w on 30m. Thanks for the help guys. Dave, G8PGO

Hi Dave, as its 20m your problem is most likely to be the caps on the lpf board, search the forum and you'll find several references to it. I can't remember which ones off the top of my head but it's

Hi Power measured on a U3S running at 5V on the PA at 20M bilfler wound, using R &S NRPS8: and Just under 7.5V PTP on the scope (7.375V) nothing wrong with scopes! 73 Andrew G8UUG

Ok, then that explains my concern when I saw one oscillator value of 27,004. So I wont change anything and judging from my recent QSO there was no mention of being off freq. Thanks

This drift in power output is most likely a thermal effect. The BS170 changes its offset voltage in function of the junction temperature. See https://www.onsemi.com/pub/Collateral/BS170-D.PDF You may

Jim, I didn't have time to do any of the things, last night, that you proposed but will start trying those later today. I'll anxious to see those results and will report back. 73's. John / K7RLD

Paul, I cannot see this being anything other than a short to ground. The track from the slider of R47 is very thin, it goes close to pin 1 of the LCD, maybe a solder whisker there? Get a powerful

Arv, you may find the answer reading Ricks first post explaing why he is looking for prewound posts. Martin DK3UW

That's certainly possible, but doesn't seem likely since this is the second pot that I've installed (the first one got pretty toasted when I first powered up and it was sitting right up against the

I'm wondering if the contrast pot has a fault whereby the mechanical stop is further clockwise than the end of the track and the wiper contact is bridging the two ends of the track. John G4YTJ

I have a U3S which I am considering converting into a VFO/SigGen. From what I can see, the PCB is identical, except the VFO kit has a rotary encoder with switch in place of a simple switch on the U3S,

So I investigated a bit more on this. There definitely appears to be a short somewhere but darned if I can figure out where it is. For example, when I put my probes across R65, I get a dead short

Thank you Ron, and thank you for the perfect picture!

George, this is the maximum setting with solder blob next to the center pin 180 from there is minimum and in between on either side is where you want to see it when adjusted. Ron

The most recent kit has a different style trimmer. It is a nice trimmer with a soldered plate. The instructions on page 67 showing perfect trimmer adjustment cannot be applied. Will this be the

Hi, yes it is 20m. Will see what happens on the other bands. PA Transistors are running at 13.8v 73 Dave

Good on you, John At this point we make like it's a brand new repair. Do we have 5 volts on the 5 volt line? Do we have 2.5 volts where R1 and R2 come together? Do we have roughly 2.5

I wonder if it is 20m, and the LPF caps might need tweaking? I have never seen my U3S do that, must admit. Roger G3YTN --- *************************** Roger Hill ***************************