[AMRadio] Power Levels

[James M. Walker]

B.S. and Huraumph,
I have (2) BC-610 transmitters one (E) and one (I), both run 2400 VDC
on the plate of the 250TH. According to the Technical Manual for the
transmitter the plate current should be 390 milliamps for the system
to work correctly, RF stage and Modulator stage.

That makes my input power 906 watts and according to your 60 percent
efficiency statement, I should be getting 543.6 watts output into my
dummy load at 50 ohms, my watt meter (Bird 43) READS 565 WATTS WITH NO
REFLECTED FROM THE DUMMY LOAD. I have been running BC-610 transmitters
for quite a while, I generally run around 350 watts of carrier output
to keep peace with my neighbors.

What do you base your statement on? Pretty inefficient, I would say
closer to 77 percent, as per the specs for the 250TH in class "C"
operation with 2400 VDC on the plate and 70 milliamps of grid drive
and also a bias setting of 110VDC minus.

I THINK Efficiency is in the eyes of the beholder! Power is power,
the entire transmitter needs about 2500 watts to provide the above
levels
about as efficient as any class E setup. What is your point.
Jim
WB2FCN
AM radio, it's not just a mode it is a way of life!

"Steve Cloutier, 978-597-3311" wrote:
> 
> >
> >     I know that my BC-610 HAS to be throttled back to keep legal output.
> >Today's line voltages are too high for the design of this equipment.  I use
> >a BIG variac to keep the voltage supplied to the BC-610 down closer to
> >original design voltage supplies.
> 
> Hmmmmmmmmmmm... I bet it doesn't!  The BC-610 is a pretty inefficient
> transmitter - I bet not much better than 60% - MAYBE - DC input to carrier
> output.  Does your BC610 run 600 watts input?  Maybe it does... the ones
> I've seen don't run that much power :-)
> 
> Of course, if you want efficiency, run class E, but that's discussion for
> another time :-)  The class E web site is at:
> http://www.netway.com/~stevec/ham/classe.htm
> 
> Regards, and hope to hear that 610 on the air.
> 
> Steve, WA1QIX
> 
> >     If I run straight from the line voltage now supplied it will easily run
> >500W or better carrier.  Obviously this will result in a significantly
> >greater than legal output at 100% modulation.
> >
> >     I NEVER professed to be THE source of absolute or correct interpretation
> >of the Rules and Regulations.
> >
> >     Once again - My intent and purpose was simply to let the discussion
> >continue, and not be stifled.
> >
> >Bob - N0DGN  Craf-T-Bob  (Because I love Hallicrafters!)
> >Apache(2), Mohawk(2), HT-32A, SX-99, SX-101 mk III, R-390A
> >EAC, R-390A Collins, DX-60 w/HG-10, BC-610I, BC-939A
> >
> >
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> >AMRadio at mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/amradio
> 
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