Gerald, Ripple on the helix will produce phase modulation - a well known function of the TWT used in the Serrodyne. (An electronic warfare approach, where you receive the radar signal, amplify it in
Manfred, Over here, unhooking the scope ground lead would, in an industrial situation, let all hell loose with Health and Safety! It would lead probably to suspension before dismissal, and could conc
Manfred, 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. So even if
Manfred, 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. bee
Manfred British ones? In my country they aren't valid anyway - and I wish there were any at all! < Actually Manfred, your government has signed up to them! I'm referring to the International Radio Re
Paul, 1000pF is 45 ohms at 3.5 MHz. If the plate choke is 250 microhenry - typical value - that's 5500 ohms. There's around 2kV RMS of RF on the plate, so that's 360mA of RF in the choke and 16 volts
Karl-Arne, Manfred, In the UK, the old amateur licence did require 'adherence to any relevant international telecommunications convention', i.e. the RRs and any ECC Decisions (ECC - Electronic Commun
Then wire 1-3 x 500pf ceramic doorknob caps in parallel with the 4700 pf caps. The 500 pf caps make for an excellent higher freq bypass cap.< You will have about 1 volt across that combination on 80
The 50 microhenry will effectively have around 2000pF across it - the capacitors to ground at either end - and so will be resonated around 450kHz. At that frequency, the plate choke is about 700 ohms
Manfred, Chile would seem in practice to be not that much different to most other countries! Enforcement in the UK is very light, and not only on radio approval but EMC approval. They do deal with in
Roger, The 43 dB applies at 2.5 times the necessary bandwidth away, or for SSB, at about 7.5kHz away from the centre of the transmission. I would like to send you the results of the measurements of S
Roger, It just so happens that at 1345 UTC this Saturday, I'm giving a presentation at the RSGB National Convention entitled 'Spreading the Sewage' - we didn't think that 'Spreading the S**t' was qui
Indeed Alex. If the device output current is defined as I0 + k1v + k2v.exp2 + k3v.exp3 etc where I0 is the dc, v is the input volts and k1, k2, k3 etc are the coefficients of the transfer function Th
Better is 'ground end of shorting wire is attached first and removed last.' Was hearing stories yesterday about what happens if you don't do that when working on HV overhead lines - 400kV, 275kV, 132
Carl, I am not trying to be rude, but surely Neither should be subjected to sharp bends and the manufacturers specs should be followed. RG-213/214 type dielectrics are much less prone to cold flow bu
The neutral is probably grounded at the distribution transformer. That's likely to be a Y secondary and the centre point is 'grounded' and forms the neutral. Depending on the load and how much resist
At least here, 240 volt single phase is from the centre point of a Y connected transformer. The outside ends of the windings all have 415 volts between them i.e. if you wire them a to a delta load, t
Of course, if you really want a complex system, try an Airbus! Two AC buses and two DC buses each of which can be cross fed, and 'ESSENTIAL AC' and an 'ESSENTIAL DC' bus, engine driven generators, a
ground wire, but WHERE and HOW it is connected varies widely from one country to another. In North America,.neutral must be bonded to the "green wire" (ground) where power enters a building, and aga
Paul, Polyester film caps aren't that good, because generally, they have too much inductance, the dissipation factor is high so they cannot carry much RF current, and even a 0.1 microfarad ceramic di