Bob, First check your power supply and the cable connections between the Power Supply and your K2. The conditions you report are classic for a low voltage at the K2 power connector and/or a high resistance (loose connection) in the power supply path.
73, Don W3FPR > -----Original Message----- > > Up to this morning, this K2 was a nice and good worker, with > during the last > six month about a thousand QSO under his belt ! > But this morning turning it on, I just got a vigorous howl ( > very low freq nois !). I turn it off, and > on after a few second. > The Rx start normaly and the noise start again after > a few second. Re-turn off and tunr on and no howl and Rx is working > correctly! > The set was in CW mode so I turn down power (to abt 2/3 watts) > and close the key... > The result is correct on 1.8, 3.5, 7.0 but nil on the rest of the bands. > Closing the key a little longer on 7.0 the rig goes to > curent overange in abt 10/12 second and power fall down to zero. > So power off, open the rig, remove the bottom cover and before > removing the > heat sink just check the resistance of driver and PA. > On Q6 (driver) E to Gnd 1.3 ohm, B to Gnd 76/80 ohms, and C to > Gnd > 500 ohms. > On Pa C to Gnd > 600 ohms, B to Gnd 120/130 ohm E to Gnd 0 (it's > normal!). > They seems to be normals but any time I close the key I get High > Cur after 5/6 seconds and power out ZERO !! > I do not know what to do, so I will wait till tomorow and hope > to get some > indications from the list ! > Thanks in advance guy, BCNU > 72 Bob/F5UL > > _______________________________________________ Elecraft mailing list Post to: [email protected] 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
