Hi John, I was being slightly facetious as "zero crossing" is something that is relied upon to interrupt arcing across the contacts of an AC circuit breaker. This is why the DC interrupting rating of
Vic, I recently had problems working on a solid state final. The transistors idled fine but the minute I applied drive the collector current went way up and the output was low. I too, let the smoke o
Vic, You might want to just replace the bad transistors and maybe order a couple of spares. See how the others perform when you test per your plan. And, I think your plan is a good one. Watch the DC
Steve, You bring out a couple of good points, so let me pick your brain if you will: In your experience, where does a supply decoupling fault usually show up in a low Z solid state final. Do turn to
Steve, The 4 wires that you refer to in distribution systems most likely consist of 3 phases on top and a neutral below. Skin effect is taken into consideration in high current applications such as g
Rich, In your experience, roughly what maximum output power would you expect from a single 4-400, in GG configuration with 5 Kv anode voltage? Thanks, Jeff
Respectfully, my next questions are: What is the limiting factor. If the 4-400, operated as a triode, were capable of 1200w pep, would not the 3-500 be capable of 25% more? I'm making my assumption o
Gentlemen, I'm repairing the pa board (100w) in an Icom 275H and need to replace all 3 of the monolithic chip capacitors in the output circuit, as they are burned open. I also need to replace the cer
Hi: Steve, Colin, Todd, Thanks so much for your replies, they are very much appreciated. Steve, I've done little work with solid state rf pa design but long for understanding. I will try to describe
Mike, my guess is that it is not a synchronous motor, but an induction motor. A synchronous motor locks right into the AC synchronous speed and stays there. Hence, a 2 pole synchronous motor @ 60 Hz,
This was not originally *my* question, I just felt that Rich did not accurately address it in his first reply, and I didn't want to miss the wisdom that might come forth should he reevaluate the ques
Gee, Rich, I wouldn't feel insulted by this statement at all, seriously. ...and if it were I that was referred to, I would feel honored to be considered as, and critiqued by, "friends". Jeff - K1LE -
Usually the run winding consists of larger wire than the start winding. Thus the X/R ratio is high and current is lagging voltage. The start winding is wound with smaller wire, thus it has a comparat
Thus could run Good question, Rich. I was going to say yes, but I didn't want to answer so quickly without taking a look at the type of motor that is often seen on blowers (with attached 1-4uf capaci
draw Or, altering the voltage / current waveform to the supply primaries -- would be interesting to look at on a scope, without the RF bypass. Jeff - K1LE - CT
Firstly, I would like to say thank you to all that responded to my = questions per transformer rewinding. The information and web sites were = most informative. I will probably start with a low volta
Thank you, gentlemen, for your responses re my questions pertaining to = the suitability of a transformer with a 106 Ohm secondary at 5300 volts = and a 120 volt primary. BTW I rechecked the primary