K2 s/n 4276 Output Power Instability
Posted by
kc4wvl on
Nov 15, 2007; 5:04pm
URL: http://elecraft.85.s1.nabble.com/K2-s-n-4276-Output-Power-Instability-tp366380.html
K2 s/n 4276
Firmware Revision(s): 2.04P 1.09
After having a previous issue with the VCO alignment (p. 61), construction went forward without a hitch. At this point, I figured that any gremlins had been banished. Not so.
Another pesky gremlin has reared it's ugly head. During transmitter alignment, the initial 40 meter alignment went down in accordance with the manual's expectations. Receiver pre-alignment was straight forward. Alignment of 20 and 30 meter transmit went fine, then from that point on, it all went downhill and the current issue began. Regardless of which band or power setting, on entering TUNE, the power out readings rapidly vary across the entire scale. These rapidly changing readings are also reflected on my Diamond SK-600 power/SWR meter as well as the readigs on the current meter of the power supply. After a brief bit of time, the power out will sometimes stop fluctuating and settle down to the requested power setting.
Might this be a problem with U-6, on the control board?
I would appreciate any insight of the possible cause of this issue and suggestions of any possible sollutions.
73's
William Smith
KC4WVL
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