[Elecraft] KAT100 problems...
Hello all, I have a K2 setup (#4819) with the 100 watt tuner/amplifier in separate EC2 enclosure. Things have been FB for 3-4 months, but recently while using 100 watts the tuner is unable to get below a 9.9 SWR on 80 meters, even though other bands tune fine. KAT100 Tuner also does not seem to remember tune settings anymore when returning to a previously tuned frequency. It will retune from scratch each time... I rotated through the relays and all seem to click ok, although the relay for 80 m seems to sound slightly different...When using just the base K2 separated from EC2 the KAT2 internal tuner works fine and remembers settings. Board parts placement and solderwork appears ok. Is the relay itself the most likely culprit, or should I be looking at something else first? Could someone please point me towards things to check in order of likelyhood? Thanks for any help! Mike Sexsmith W7MSX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
Re: [Elecraft] KAT100 problems...
On Tue, 29 Nov 2005 07:36:02 -0800, Mike Sexsmith [EMAIL PROTECTED] wrote : Hello all, I have a K2 setup (#4819) with the 100 watt tuner/amplifier in separate EC2 enclosure. Things have been FB for 3-4 months, but recently while using 100 watts the tuner is unable to get below a 9.9 SWR on 80 meters, even though other bands tune fine. KAT100 Tuner also does not seem to remember tune settings anymore when returning to a previously tuned frequency. It will retune from scratch each time... I rotated through the relays and all seem to click ok, although the relay for 80 m seems to sound slightly different...When using just the base K2 separated from EC2 the KAT2 internal tuner works fine and remembers settings. Board parts placement and solderwork appears ok. I wonder if this is RF getting into the tuner. With mine on 80m I have to reduce power to 11 watts to tune either antenna (zepp/80m inv-l) in the CW section of the band. If I don't the tuner goes crazy and somtimes turns itself back to CALP or the leds start acting weird or it looks like it has tuned, but it once you tx at full power the swr is full scale. On 80m phone I don't have these issue. On 160m it tunes the zepp no problem. Pat N8VW ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
Re: [Elecraft] KAT100 problems...
Hello Mike, the problem sound familar to me. When i build KAT100 everything worked fine for some hours. After a while same problem like you described appeared on my KAT100. One relay click sounds a bit different and i could not match all bands anymore. I thought a relay would be not okay, but the reason was a defect in one of the small condensators connected to a relay. How i identified the component : I turned ATU to Cal mode and meassured voltages on all 6B595 pins connected to a relay. I found one voltage below power supply voltage. After replacing the condensator it was working fine again. It happends two times allready that a small condensator failed in my KAT100. 73 de Joerg (DL3QQ) -Original Message- Date: Tue, 29 Nov 2005 16:36:02 +0100 Subject: [Elecraft] KAT100 problems... From: Mike Sexsmith To: elecraft@mailman.qth.net Hello all, I have a K2 setup (#4819) with the 100 watt tuner/amplifier in separate EC2 enclosure. Things have been FB for 3-4 months, but recently while using 100 watts the tuner is unable to get below a 9.9 SWR on 80 meters, even though other bands tune fine. KAT100 Tuner also does not seem to remember tune settings anymore when returning to a previously tuned frequency. It will retune from scratch each time... I rotated through the relays and all seem to click ok, although the relay for 80 m seems to sound slightly different...When using just the base K2 separated from EC2 the KAT2 internal tuner works fine and remembers settings. Board parts placement and solderwork appears ok. Is the relay itself the most likely culprit, or should I be looking at something else first? Could someone please point me towards things to check in order of likelyhood? Thanks for any help! Mike Sexsmith W7MSX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
