Older K2 Problem and fix
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I have noticed my old K2 (S/N 023) has been showing its age. I did do most of
the Rev B mods, except the audio pot mod, which didn't seem necessary at the time. Well, the audio pot finally started to get scratchy. Also the Power pot and the RIT were jumpy. So I broke down and took it apart, applied a little Deoxit(tm) to all the connectors between the Front panel, Control and Main board, as well as seeping a little into all the pots and working them a few times. Put it all back together and realigned the filters with Spectrogram. It's like a new rig now, no scratchy pots, and the audio level has even improved. So I guess every 8 years or so, a little preventive maintenance is in order. ;-) -- --- _ _ _ _ _ / \ / \ / \ / \ / \ John L. Sielke ( W )( 2 )( A )( G )( N ) http://w2agn.net \_/ \_/ \_/ \_/ \_/ http://www.blurty.com/users/w2agn Member screwed by QRP-ARCI! http://w2agn.net/noarci.html _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Last weekend I took my K2 to the Huntsville Hamfest to help out with the
Elecraft booth there. I had a gel cell battery hooked up to it so folks could twist knobs, push buttons and see what happened. Several folks did. Today I turned the K2 on for the first time since then and strangely I had to retune the KAT2 for all bands on both my dipoles. As far as I can tell, neither dipole has changed physically. One is an attic dipole and the other is an inverted vee hung from trees in the yard. Both are fed with ladderline. The attic dipole uses an LDG BA-1 4:1 balun and the inverted vee uses the Elecraft BL-2 set to 4:1. I had the inverted vee attached to Ant 1 and the attic antenna to Ant 2. Both had been automatically tuned by the KAT2 to better than 1.2:1 on 80m through 10m before the hamfest. I thought at first that maybe something had reset all my internal data, but all the menu parameters I've checked, including the filter settings, are unchanged. Would some set of button punches have cleared my KAT2 settings while leaving everything else ok? I did not have an antenna or dummy load connected to the K2 at the hamfest, but I'm pretty sure I would have noticed someone doing Tune on all the bands on both antennas! Retuning the KAT2 worked fine, so there's no residual problem, but it's a puzzle to me as to how this could have happened??? 73, Randy, KS4L _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Randy,
I would suggest that at some time or other, someone pressed the TUNE button while they were exploring the operation of your K2 - in fact, it may have happened several times. Pressing TUNE with something other than your normal antenna will change the ATU settings. Setting the menu items takes multiple button presses, but doing a TUNE is just a one button operation, and yes it is likely that someone 'trying out the K2' would press that button. Next time, connect a dummy load to both the ANT1 and ANT2 jacks to protect your K2 from any possible damage (but that will not prevent changing the ATU settings for each band). 73, Don W3FPR Randy wrote: > Last weekend I took my K2 to the Huntsville Hamfest to help out with > the Elecraft booth there. I had a gel cell battery hooked up to it so > folks could twist knobs, push buttons and see what happened. Several > folks did. Today I turned the K2 on for the first time since then and > strangely I had to retune the KAT2 for all bands on both my dipoles. > As far as I can tell, neither dipole has changed physically. One is > an attic dipole and the other is an inverted vee hung from trees in > the yard. Both are fed with ladderline. The attic dipole uses an LDG > BA-1 4:1 balun and the inverted vee uses the Elecraft BL-2 set to > 4:1. I had the inverted vee attached to Ant 1 and the attic antenna > to Ant 2. Both had been automatically tuned by the KAT2 to better > than 1.2:1 on 80m through 10m before the hamfest. > > I thought at first that maybe something had reset all my internal > data, but all the menu parameters I've checked, including the filter > settings, are unchanged. > Elecraft mailing list Post to: [hidden email] 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 |
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