By "off," Don, I meant using the POUT setting....that's what I used....saw 5 watts out 2 watts reflected in the POUT mode....connected the k2 to a dummy load, set the K2 to AUTO, tuned up on all bands, set the K2 to POUT, hooked the antenna back up and now see 0 watts reflected on 40... > Date: Thu, 30 Apr 2015 09:17:37 -0400 > From: w3...@embarqmail.com > To: rodenkirch_...@msn.com; elecraft@mailman.qth.net > Subject: Re: [Elecraft] K2's ATU "vagaries" > > Jim, > > I am not certain how you would set the KAT2 to OFF. That is not an > option in the menu. > Setting the ATU menu to CALP or CALS will electrically bypass the L/C > elements in the tuner, but there will be some residual reactance in the > tuner. > > The best method to "bypass" the tuner is to do as stated in the manual - > tune (on each band) using AUTO mode into a dummy load and then set the > ATU menu to POUT. The L/C combination last used for the TUNE on each > band will be set when you return to that band. > > Note for KAT100 users - POUT is not an available menu option - you can > use CAL which bypasses the L/C elements completely. > > 73, > Don W3FPR > > On 4/30/2015 8:21 AM, James Rodenkirch wrote: > > While altering my existing antenna system which includes an LDG Z11ProII > > auto-tuner at the base, I had to do quite a bit of "testing" from the > > shack; e.g., add a un-un, go to shack, hit the tune switch, watch power out > > and SWR.....switch to another un-un with a different ratio, follow same > > procedure. All of this with the K2' internal auto-tuner turned of. > > > > The antenna "alteration" I was trying wasn't providing the LDG auto-tuner > > with Zo values it liked so I was switching the K2's auto-tuner in and > > trying it across the various bands to see how it "played" with the altered > > antenna. After an afternoon of this I surrendered and restored the antenna > > to its original configuration, one the LDG auto-tuner tuned effortlessly. > > > > Note: the original system is a 36' vertical with 12 elevated radials an the > > auto-tuner at the base of the vertical. The LDG has always tuned that > > configuration effortlessly on 40 through 12. > > > > After restoring it back to its original configuration I went through the > > tuning cycle - K2's ATU off, hit the tune switch....yadda, yadda; that's > > the configuration I use - ATU off, K2 set to watch pwr out and reflected- > > the POUT mode. What I found was: the LDG tuned 40 through 12 effortlessly > > BUT, on 40 meters I observed 5 watts out and 2 watts reflected (prior to > > all of this, it was zero watts reflected). Given the vertical is back to > > its 36' configuration one would expect zero watts......so, I retuned > > several times but, same result. I could tell the LDG was tuning correctly > > and with 30 through 12 showing no reflected power I kept wondering of the > > K2 was "acting up." > > > > I found the internal ATU manual and start reading up on the "Using the > > ATU." I found this: > > > > As an alternative to CALS or CALP, you can tune up the ATU into a 50 > > ohm dummy load on each band using AUTO mode. This will > > cancel out most or all of the stray inductance and capacitance so that > > you can connect your external tuner or resonant antenna. > > After tuning up on all bands, put the ATU in to POUT or SWR mode> The > > matching network settings will not change. > > > > I ran through that sequence and...poof....no reflected power on 40 meters! > > > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net
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