There are situations when running a driver at it full output is
desirable. Or when running at very low output is not as stable.
Two examples:
I have a 6-dB 30w attenuator on the input of my 2m 1500w LDMOS Amp
(MRF1K50H) which ensures that my 25w transverter will not overdrive the
amp. The attenuator is a small board with high power resistors obtained
from W6PQL:
http://www.kl7uw.com/2M_W6PQL_1500W_PA.jpg
My 600w 1296 amp requires 10w drive and is 100-foot from the
transverter. The LMR600 line loss is 6-dB so I use a 3-dB chip
attenuator to get a stable 1.5w drive into the 10w driver at the amp:
http://www.kl7uw.com/23cm_driver_1.jpg
That allows me to run my transverter at 12w in the shack (max output is
18w).
Of course I am using a K3 with KXV3 to drive to my transverter (no
overshoot). No external ALC for the K3.
73, Ed - KL7UW
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