A quick note to all those who are still interested in that power factor theme: Yesterday I repaired a 22kW motor drive, like there are millions being used in industry. This is a quite modern one, mor
Bill, Wind it on a piece of 3 inch diameter pipe under as much tension as you can and you will have a strong, stiff coil with plenty of current carrying capacity. It will have essentially zero loss a
Bill, you are missing the main point here! Another way to float the scope is with a sine wave type inverter running from a 12 volt battery. Mount the inverter and battery in a box and you have a port
Bill, I can see us two 30 years from now, VERY white haired, still discussing the same topic! ;-) Think about it: With a battery powered scope and using the dual probe ADD + INVERT mode, Oh well, you
Hi guys, as I understand it, NASA wants as many hams as possible to send out series of half minute long carriers, for several hours, on many specific frequencies decided by NASA and covering all the
Alf, it's not correct to compare a SMPS with this topic. All SMPS are isolated. Output terminals are behinde a transformer for sure! Why is it then not correct to compare them? In directly line-power
Carl, The T-225/225B (there is no T225-2A) size buys you absolutely nothing over the 200 size except a few more turns of wire of the same diameter. Wrong. While the inductance per turns of the T-225
Jim, I think this question is kind of mute now with the government shut down. Do they stop the spacecraft in their orbits while the government remains shut down? I fear that will be kind of hard to d
When the fuse blows the plasma will conduct the rest of the current straight to ground acting as a self sacrificial crowbar. It's far better to avoid letting plasma loose in a circuit. You know, that
Carl, ** Youre certainly wrong all right Manfred. The slight size difference is not enough to make much difference especially when only about 1/2 the turns the core is capable of for a pratical SB-22
Peter, The numbers I've seen for flux density suggest that at 160m, you should be at no more than 100 gauss or 10 mT for reasonable losses and linearity.......and preferably a bit less. Yes, that's a
Paul, your case with that amplifier is interesting. Could it be that your plate choke was arcing over between those turns where the insulation flaked off? Or perhaps those turns tended to get shorted
Peter, it is interesting to look at the WW2 German radio equipment - obviously designed pre-1939. The use of ceramics, especially in capacitors, and iron cores is interesting, to say the least. I hav
Peter, and all, Actually Manfred, your government has signed up to them! I'm referring to the International Radio Regulations, published by the ITU, and signed up to, by all the participants in a Wor
Paul, Which leaves me wondering if other upgrades or changes would be a good idea. The by-pass capacitors surely are not much good at low frequencies, some maybe even a bit marginal on the lower HF b
Hi Paul, I was thinking I could wire the primary as 250VAC input i.e. put all primary windings in series and supply it with 110VAC input which should drop the HV output to less than half. What doe th
Carl, With much lower core loss and less than half the primary power and half the secondary power consumed the regulation should be much better than the 15% Ameritron rates it at in the 811H. No. Unl
Carl, I dont know the current requirements for various levels of licenses in the UK but over here even a certified retard can pass an Extra as no CW is required and anyone can be trained to memorize
I can't help but contribute my own wisdom to this thread, too! In Chile, in ancient times, we had 220V with two-pin outlets. I don't know exactly when the standards were changed to include ground, bu
There I go again... this time trying to help people to understand power distribution systems in 220V countries. I will base this on the system used in Chile. This should be very similar to that used