John / Don: I don't have a K2 (just got my new K3/10 operational yesterday), but I wonder why you need a tuner between the K2/100 and the tube amplifier. Shouldn't the tuner be put in bypass mode or does the amplifier not have a tuned input on the various ham bands?
73, Doug VE3MV ----- Original Message ----- From: "Don Wilhelm" <[email protected]> To: <[email protected]> Cc: <[email protected]> Sent: Saturday, January 10, 2009 12:53 PM Subject: Re: [Elecraft] K2/100 Problem with Hi Reflected Power driving amp > John, > > Just how high is the reflected power (do a TUNE and it will be > displayed). The KPA100 throttles back power if the SWR is greater than > 2.0-1. > > There are several possibilities, and only some have to do with the > K2/100. One is a bad coax, another is a PL-259 that is not properly > tightened to the KPA100 (or anywhere else in the system). What happens > when you transmit into a dummy load? > > Your problem may be in the input of the amplifier and not the K2. If > the amplifier drive impedance changes when it sees RF, then it may not > be usable without modification. Is there any chance that the input > circuit to the amp is not fully switched and the bias stable within the > 15 ms. period after the K2 key is closed? > Does the problem show up only on CW or do you get the same result when > operating SSB with PTT? If that is the problem, you will have to > speed-up the relay in the amp (or replace it with a faster relay). > > If this is a recently constructed KPA100, I have a different set of > questions? Do you find the same result on all bands or only one or > two? Does the Hi Refl message appear when working the KPA100 into a > dummy load? > > 73, > Don W3FPR > > John wrote: > > Hi all. I have a K2 with the KPA100 installed. I'm using the K2/100 to drive > > a tube amplifier through a tuner. The K2-100 keeps tripping off with the > > HiRefl message showing not every time, but often enough that a QSO is > > impossible. The K2/100 doesn't 'reset' (has no output) when rekeyed unless I > > rotate the power setting knob ever so slightly. > > > > What am I doing wrong? Any way to increase the delay before the High > > Reflected power takes effect as I suspect it's transient? I also have the > > t-r rel > > > > Any assistance will be greatly appreciated. > > 73, John WA6YSY > > > > > _______________________________________________ > 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 > -- I am using the free version of SPAMfighter. We are a community of 5.8 million users fighting spam. SPAMfighter has removed 1012 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message _______________________________________________ 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
