what sort of pulse width are you able to get? working on ionospheric sounder for the back yard :-) -bob Interesting item. By coincidence I am working on a power tube tester today. I built one some ti
While we are on the subject of lightning, let me mention a friend. I went to school with Scott Bradley, more years ago than I care to contemplate. While I went to learn about electronics, Scotty deci
Pete OK But I still don't understand how enough EMF can be generated to cause problems. I'm probably confused by the ratings they use on MRI machines. When I'm in the MRI machine and it's a 0.5T fiel
Been doing a little research, more to do, since posing MRI question. Seems there is a high background field which is held constant, for proton alignment. Then there is a time varying field, much smal
SteveWowsa! Thanks! I must be crazy! This is just what I was looking for, without having to 'buy the book'. Might have to call doc friend on some of the medical terminology, but from quick skim just
old stuff is good too... I'm waiting for 'next generation' from TT. have old argonaut but for main station Happy with TR7/R7/Sherwood 7SP combo. stock numbers... NF -135dbm 100kc blocking 146db LO no
If you travel, it's a big deal. Built in 'universal' power supply is nice too. Yeasu FT101B was really nice for travellers. With the actual radio getting smaller and lighter, it will be nice if someo
OK, I'm confused (puzzzled). If ORION was designed for contesting AND weak DX work. THE WHY DID TT LEAVE OUT A KEY FEATURE? PTT FOR CW? I am currently interested in the DX capabilities, BUT maybe wi
Increasing the IF Gain on the Jupiter increases the receiver sensitivity by about 20db. Such a thing would be possible only on a very bad receiver. I don't own the Jupiter, but I doubt that it could
Yes, I was just giving the PTT on CW guys a hard time. My external PIN switch is set up for sequencing :-) But, I've not seen a small external sequencer for use with older amps that do not handle the
If ORION was designed for contesting AND weak DX work. THE WHY DID TT LEAVE OUT A KEY FEATURE? PTT FOR CW? I don't understand why PTT is so important. Wouldn't QSK with amp be better? I've heard big
Bob All amps do not handle key sequencing and some of us can build something for which a nice set of composite OZ's would be a better analogy than garden rollers. 73, -Bob ah7i A fascinating idea but
Sorry I don't understand. Though I guess if I could understand your point, it may well be I would agree with it. What is it that you can build for which a nice set of composite OZ's would be a better
The bad news is that transceivers using these chips cannot be built on the cheap. The chips are expensive, and even more expensive are the software design teams that make them work. they can be buil
Jim Vertical works well in the middle of the Pacific, provided you're not way up a valley :-). Soil conductivity in KH6 is generally WAY higher than mainland which is good (not many radials needed fo
good description of short antenna efficiencies http://www.ee.surrey.ac.uk/Personal/D.Jefferies/radimp.html this is part of a larger writing that antenna experimenters might enjoy reading...I dd anywa
Why all the fuss about these heil microphone elements? Why not use a standard mail order communications electret element such as used in cell phones? They are only a buck or so at the surplus store a
The cell phone elements are not tailored for voice? I've a couple of nice old mics that used crystals and the crystals being hygoscopic have 'worn out'. Guess I could try one of the cell phone elemen
here run 2.3kc followed by a 2.1kc, both 8 pole and it makes a big difference on crowded band. for CW, which is 99% of activity, the 2.1 follows a .300 or a .500 and believe it ot not makes a big dif