It's about examining the claim of 6v variation in Vf with a 0.1A to 1.2A change. cheers, Steve - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
** Not bad. ** Sounds good. ** Agreed, although a 3A diode string requires no heat sink. ** You believe a fraction of a volt of RF-NFB is not ok? ** During an HV- to gnd arc, no -- but during a VHF/
** Quite rightly, Paul. This is why the 100V npn switch transistor (Q1) is protected by the 51V, 1500W-pk voltage surge suppressor diode. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcn
Two tubes doubles the feedback C, so mo' tubes means less vhf stability. However, since doubling the number of tubes halves the RL, double the C-tune is needed to maintain the same Q. it should be d
**The TL-922 uses an exhaust fan with good results, according to temp measurements. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
Good point. Also. every 1000' elevation decreases air density c. 3%. The air that is pushed through a SB-220 has a temp rise of less than 40ºF on SSB. The TL-922 uses an exhaust fan config. to
Start-winding motors are used in compressors, where the motor needs to be able to start against static gas pressure. I have never seen a blower or fan with a start-winding. - R. L. Measures, a.k.a.
Semi-agreed. In my mind, on a 4-wire AC motor, an unswitched winding that is always in series with a 1 - 8 uF capacitor is a run-winding. To: <amps@contesting.com> - R. L. Measures, a.k.a. Rich...,
The MRF-430 FET is rated at 1200W in push-pull with a 50V Vcc. A pair costs a bunch. The humungous audio amp he described could have been used by Pecos Bill . . . . writers. - R. L. Measures, a.k.a.
This is as I have measured. Once the motor is running, can the high-resistance winding be disconnected? None of the centrifugal blower that I've seen switch the high-resistance winding out when the
One rub with vapour-cooling is that the cooling water is normally vented to the atmosphere. Since humans exhale carbon-dioxide, carbonic acid forms in the water -- which makes it conductive - plus c
The telling is in inlet/outlet temp rise of air. In other words, a fun, educational project - and little else? cheers, Barrie - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measu
** The Consolidated B-36 was a pusher type aircraft. The sucky side of the 6-propellers passing by the wings' trailing edges created a beating noise that shook the earth below. - R. L. Measures, a.k.
The beating sound from a helicopter comes from the sound of the rotor tips approaching the speed of sound. // Off topic tidbit: The rotor tips move so fast that, with an IR night video, air-friction