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I always use silver mica capacitors in a pi network.? They cost more but I have never had a problem when using them. Lee, w0vt

One last caveat:? The measured inductance will very with the frequency used to measure the inductance.? Hans has not told us if he just calculated it or if he measured the best inductance with an

Hi All I also have a 20M version. The output is about 1.4W on 11.5V taking 400mA on T/X (all these are approx values). We need to get some more information about what is going on i.e. is it a loss

I'm still waiting for my 40 meter version (#943) but shipping has resumed again as of yesterday so hopefully by the end of this month. I have all the proper cores for all the toroids called for in

It was just trial and error. I realized that I had to spread windings over the whole core. So I decided to remove one turn. I did it with L2 and L3 and have good results now. I stopped at this point

Ben; keep us posted on your findings with your 20m build as I have one coming in the mail soon!? Tks, Karl

On my just-completed unit, with a 12 V supply (11.6 V on the collector of Q6) I am seeing 1.2 W output (22 V p-p into 50Ω) on key down, rising to 1.6 W after ~ 10 sec (25 V p-p). ?I removed C29, the

Hi DL3HRT, your name would be good. So why take 1 turn from L1 and L2 but not L3, L3 is part of the LPF also, just curious. I would think that if L2 is high in inductance and attenuating the output

Scrap that... with headphones plugged in those configuration items are now working, though it doesn't make a nice pure sound on 20m but a loud pulsing sound. We'll get there, I should just have stuck

Sorry I stand corrected, n00b's pay not attention! Follow the manual... it does say if the power is low, remove a turn or two... Now, having done everything at once... new problem: when I turn on and

Morning all, This is down to tolerance in the core material, the tightness will make (approximately) 0 difference to the inductance - coverage of the circumference will change it (or is that what you

Or it might confuse them more:-) Do I do it this way or as the instructions say? The design should allow for tolerances, most constructors do not have reliable measuring gear. I agree, most inductors

Yes, the wire size is mostly unimportant. No, use the same turns ratio with the smaller wire.? You'll have a bit more space for winding using the smaller wire.? I used #32 on the toroid for my

Hi all, I did some optimization on the low pass filter. Finally I had to remove 1 turn from L2 and 1 turn from L3. Power output is as expected now. I recorded some thermal images with my Seek Reveal

Hi all, Nice to be on this reflector. Received my kits yesterday, and will take advantage of all ideas. -- 73 de Gerard, F6EEQ Loc: JN25MA UFT 270, REF 27177, RCWC 257 Join the fun at

This may be of help to other n00bs as well as those without test gear. Fortunately a ham friend not too far away has an inductance measuring tool. The results are interesting, and I think important

Hello VK5EEE, 0.03 mm diameter difference will make zero measurable or effective change, in fact it's surprising how little defence the inductance is with even extreme differences in wire OD for

You can use your .3mm wire.? Turns count will stay the same. Lee, w0vt

Oh, better than that Curt - at 7am this morning I had an email telling me that my order had been shipped - the pixies must be working double shifts. I better get back to reading those

I made a mistake on my T1 and it's likely easier to rewind using new wire as otherwise it may be short... instead of the 0.33mm wire can I use 0.3mm wire without detrimental effect? Secondly, will I