[Amps] DRAKE L-7

[Bob AD5VJ]

Wanted to thank everyone for your help the Drake L-7 is humming along with
no more RFI.
A few well placed ferrites and much better grounding system solved the
issue.

I would however like to run this by you guys:

I am looking at the meter right now in ssb mode and it shows at idle 3600
Plate Volts and zero plate amps. 

I know to get to power out to the antenna I multiply the ep by ip and take
away about 40 percent since ep and ip is input power not the output power to
the antenna.

Leaving the amp in ssb mode and then placing my TS-850SAT in tune mode
(50watts output) at key down the plate voltage shows 3350 plate volts, the
Drake Plate current shows 580ma when the plate is dipped to minimum and the
load is increased to full output until no further change can be detected and
output is maximum and voltage and current are stabilized.

Then I transmit in rtty (pulsing using the mark - no data) at a drive level
of 100w (alc at midpoint - processor off) - leaving the Drake in ssb mode on
transmit, I retune the amp using the mark pulse and the plate voltage drops
to 3200 volts and the plate current shows 640ma of current with a power
indication of almost 1800 watts output on the drake power meter. 

I think the power meter is supposed to be reading power out to the antenna
but not sure it could be power input to the plate. Doesn't the output power
in this case seem a little high on the drake avg power meter? 

Since this is an avg power meter, it would be 1.3 or so times this on voice
transmissions for PEP seems awfully high.

Bob AD5VJ


		_____________________________________________
		From: Bob AD5VJ [mailto:ad5vj at ad5vj.com] 
		Sent: Saturday, February 06, 2010 4:47 PM
		To: Amps at contesting.com
		Subject: DRAKE L-7
		

		Can someone pls tell me why when I am loading up my antenna
with my Drake L-7, the Keyer on my IC-761 gets stuck. I have to depress the
VOX then turn the rig on and off to get it to unstuck.

		Any ideas?

		73,
		Bob AD5VJ