Raj, I can only guess at the reason for your 'unreliability'. I have not measured the K2 low power output stability at anything as low as 0.02 mW.
The one thing I know is that the XV144 should be linear (it needs to be to support SSB), and that the K2 determines its power digitally, so there will be discrete steps in the actual K2 power output. I have not calculated the step size with the K60XV, but by the time the output is amplified by the transverter, the steps may be noticable, particlarly with low output settings from the K2. If you plan to always operate the XV144 at the lower power, then yes, adjusting the input attenuator on the XV144 may be the better solution. Try it and see what happens - that is an analog solution and the higher power output level from the K2 should mask the minor variation in the digitally controlled steps from the K2. Note that digital steps are usually +/- 1 step from the nominal setting - so if the step size is 0.01 mW, a setting of 0.02 mW may vary from 0.01 mW to 0.03 mW where using the same step size at 1.00 mW, the variation will be only from 0.99mW to 1.01 mW and the percentage change is much smaller (1% variation as compared to 50% at the lower power setting). (My exact numbers may be incorrect, but the concept is still valid.) 73, Don W3FPR > -----Original Message----- > > What is simplest way to turn down the max power out from a XV144 from 15 > to 2W? I use a K2 and tried to turn down the power by reducing the > drive from K2 from the nominal 1.0mw down to 0.02mw but this did not > work reliably. Should I be adjusting R22 on XV144, the input > attenuation adjustment, instead? > > Thanks, > Raj, N2RD > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
