On Tue, Jan 9, 2024 at 07:36 PM, W7WRX wrote:
This guy runs his at 3450volts with 3kw out with 60 in.
?
That fellow is well know for his total bs ratings. On that GU43B amp, he uses a pulsed 1.5 khz tone fed into the mic jack, with xcvr on SSB mode.? ?1 on, 4 off, pulsed at 30hz.? ( 20% duty cycle)? ?This is on the DC input side. On all my amps, on SSB mode, with processing, the average plate current is exactly 1/2 of the key down value. Meanwhile on the output side, the average PO is only 29% of the pep value.?
?
Note on all his other amps, esp the bigger ones, he uses a 1 on and 9 off (10% duty cycle), again using a pulse generator at 1.5 khz/30 hz, fed into the mic jack of the xcvr...on SSB mode.?
?
I borrowed the HP pulse generator from work, and also dragged home the Tek 4 x channel scope.? It's amazing how low a duty cycle you can achieve.? With real low duty cycles on the input side, the plate current is not much higher than normal idle current.? Average PO is through the floor, yet pep out on the scope is sky high.?
?
Look at his 4CX-20,000C.? He rates it at 100 kw pep out on ssb.? ?Again using the 1 on, 9 off, 10% duty cycle.? ?There is no way in hell that? amp would put out 100 kw pep on ssb.? His plate choke setup is fubar.? RG-393 coax from load cap to TR relay, wtf ?? ?I don't think so.
