I see you are using hex socket screws. It is very easy to over-tighten screws to fix plastic devices to a heatsink, I've seen them crack after a little time in the field due to expansion and contract
Are you using the same manufacturer as your friends? If so, yours should be the similar performance unless something is wrong. David hi. i am not use insulators between mosfet and heatsink in order t
Sasas I looked at the ARRL site for a similar power amplifier to compare notes. http://www.w6kan.com/ssamp.html The devices are completely different and so is the supply voltage, but the push pull ar
Check the sense of all the windings, particularly T3 and check all your ferrites are isolated from the windings and everything else - the material is conductive. David _______________________________
Alex I'm not sure if you would call 500W 'high power' - I would from a UK perspective. In the classic EB104 I see ordinary transformers. Perhaps I'm not understanding something, you're the expert. Wh
Thanks, Joe, I lost site of that. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Apparently, Sassas has friends who have done so. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Also look at office filing cabinets, they are about 18.5" wide 2ft deep and 1,2,3,4 drawers high with heavy duty runners for easy access. Even new they are not expensive. Various colours and wood eff
"Radio Frequency Performance of Electroplated Finishes" by AM Fowler and an addendum page are ancient manuscripts that might bear looking at again. I'll send them to you if you can't find them via Go
Sea water freezes around 1.25 to 1.5C depending on depth and is about 5% "salt" if I remember rightly, ie much more than your dummy load which will still freeze at about the same as tap water. It wil
Ooops, that should read minus 1.25 to minus 1.5C, sorry about that. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm
I read somewhere that salty string works as an antenna, so, if you forgot your real antenna for the dxpedition... David G3UNA _______________________________________________ Amps mailing list Amps@co
I read somewhere that salty string works as an antenna, so, if you forgot your real antenna for the dxpedition... David G3UNA _______________________________________________ Amps mailing list Amps@co
I will be selling the complete line-up, ie with auto tuner. Looking at offers > GBP 1k David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
That begs a question I've often puzzled over: how does a contact rated at 10A cope with uV level signals, particularly after the gold flash has gone ? David G3UNA ____________________________________
Larry That's the sort of thing I was looking for. I have a book somewhere written I think by Schrack and my memory of it is that you can't do both jobs at the same time. Clearly, amateurs do with sev
Yes, it's on his site. Well, that's the sort of thing I had in mind and I've used it for heavy duty switches but it's the first time I've seen it on relays. Thank goodness I'm not going mad, I though
Yes, I see that in the schematic. Thanks for the info, it's more frequently used than I thought. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http
If memory serves: a 0.2" wide track of 2oz copper will take 10A for something like a 50C rise. I'd have to look up the reference to be sure. That's dc current of course. If you want to bring the trac
Make a simple plastic cap to fit over the EHT coax connector with a shaped lug to operate a microswitch inside the cabinet. When rotated and held in a keyway the microswitch is operated and EHT suppl