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Probably a good idea since I don't think I'd like the smell of a burned out
plate transformer and rf choke. "K3HVG" wrote in message ... FWIW, Although the Drake manual for the L4B says that tuning/operation for CW and RTTY are the same, in one of my L4B books, there's what looks to be a 2nd or 3rd generation copy of a Drake letter that speaks to RTTY activity. The Drake letter recommends that the power level for RTTY be limited to 400 watts, citing the near 100% duty cycle, when key-down. I guess you take your pick? I run mine at about 400 watts, just to be on the conservative side....... John, N9JG wrote: I have a Drake L-4B, which I purchased new in about 1975. Recently I have started to use RTTY mode with the L-4B, and I have some concerns about what is the safe RTTY power level for this amplifier. The Drake easily puts out 1 kW into my antenna, but during an RTTY contest the transmission duty cycle can approach 50%. During a long-winded rag chew, a transmission might be as long as five minutes (just like the old AM days!). I am reasonably certain that the L-4B (both the amplifier deck and the PS) can withstand long transmissions at (say) 500 watts out, but my concern is with the 1000 watt level. John, N9JG |
#2
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Before I read Jeep's response, I was getting ready to respond that 400 watts
of output is right. Solder melts and things fail. I think that is a realistic number. It is not the tube plate dissipation that is the limiting factor. It is heat - both from the components and from the currents flowing through the switch contacts and the coils. Colin K7FM |
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