KAT100 IN EC2 ENCLOSURE
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Good evening all:
I'm looking for some advise. My KAT100 / KPA100 are in an EC2 enclosure next to my K2. I was changing bands this evening and neglected to changeantenna's when moving from 80 to 40 meters. I hit the " TUNE " on the K2 and my KAT100 triedto tune. It ran through the scale a couple of times beforeI could shut it off. Now when I hit the "TUNE" button, the radio goes intotransmit, but the tuner isn't tuning anything. Normal operation the tuner would tune and go back to receive. It doesn't change back to receive unless I hit the tunebutton again. SO, the tuner quit. I remember reading about a transistor that fails and causes this issue but I don't remember which one it is. SO, looking for some information. Any idea's what I'm looking for ??? Thanks: 73 Jerry N0JRN ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Jerry,
There is no one transistor that will cause that behavior. First put an in-line wattmeter and a dummy load on the KAT100 ANT1 connector, set the power to 50 watts and then enter TUNE. 1) does the tuner tune so no LEDs are lit on the KAT100? If no, how many are lit? 2) what is the power indicated on the wattmeter (it should be about 20 watts)? You may have "popped" one or more of the diodes in either the KPA100 or the KAT100 wattmeter, but the answers to the above questions will indicate where to look next. 73, Don W3FPR On 1/2/2016 12:56 AM, Jerry Ford wrote: > Good evening all: > I'm looking for some advise. My KAT100 / KPA100 are in an EC2 enclosure next to my K2. > I was changing bands this evening and neglected to changeantenna's when moving from 80 to 40 meters. > I hit the " TUNE " on the K2 and my KAT100 triedto tune. It ran through the scale a couple of times beforeI could shut it off. > Now when I hit the "TUNE" button, the radio goes intotransmit, but the tuner isn't tuning anything. Normal operation the tuner would tune and go back to receive. > It doesn't change back to receive unless I hit the tunebutton again. SO, the tuner quit. > I remember reading about a transistor that fails and causes this issue but I don't remember which one it is. > SO, looking for some information. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Good Morning Don:
I did as you instructed. On 40 meters the watt meter is reading 120 watts. I have 1 LED showing on the tuner. The display on the K2 shows 52 wattsand 1.1-1 SWR As I change bands, the results change. The higher bands are showing less power out and SWR up to 1.5-1.. The number of LED'sshowing on the tuner agree with the SWR indicated on the K2's display. The tuner does not attempt to tune. I do not hear the relays changingas I move from band to band. Entering " TUNE " mode is the sameas entering transmit with my straight key. I have to tap my key or one of the button on the K2 to exit TUNE. Where does this take us ?? Thank you Don and Happy New Year: Jerry N0JRN First put an in-line wattmeter and a dummy load on the KAT100 ANT1 connector, set the power to 50 watts and then enter TUNE. 1) does the tuner tune so no LEDs are lit on the KAT100? If no, how many are lit? 2) what is the power indicated on the wattmeter (it should be about 20 watts)? You may have "popped" one or more of the diodes in either the KPA100 or the KAT100 wattmeter, but the answers to the above questions will indicate where to look next. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Jerry,
If you set the power to 40 watts as I asked, you should not have 120 watts output with TUNE. First you have to fix that power control problem. The most likely cause of that is the wattmeter diodes D16 and D17 in the KPA100. They are 1N5711 diodes, and you should order 4 of them so you can have 2 to replace the ones in the KAT100 if necessary. After replacing those diodes, test the KPA100 mounted on the base K2, *not* in the EC2 enclosure. If you still do not have good power control - a TUNE with the KPA100 only connected to the base K2 should produce 20 watts, TUNE + DISPLAY should produce the power you have set on the power knob. In the meantime, you might try removing the KPA100 from the EC2 enclosure and operating the KAT100 only from the base K2 (you will have to power the KAT100 from the 2.1mm power jack). Again, first into a dummy load with the external wattmeter connected in-line. With the ATU menu set to CAL, does the external wattmeter agree with the power displayed on the K2, and does the SWR agree (during a TUNE)? If so, the wattmeter diodes in the KAT100 are OK. Next, set the ATU menu to AUTO and see if the KAT100 tunes to the dummy load. If not, either the firmware is faulty or U2 or U3 or U4 may be faulty. You can go into the ATU menu and activate each relay individually - see the KAT100 manual. 73, Don W3FPR On 1/2/2016 11:01 AM, Jerry Ford wrote: > Good Morning Don: > I did as you instructed. On 40 meters the watt meter is reading 120 watts. > I have 1 LED showing on the tuner. The display on the K2 shows 52 wattsand 1.1-1 SWR > As I change bands, the results change. The higher bands are showing less power out and SWR up to 1.5-1.. The number of LED'sshowing on the tuner agree with the SWR indicated on the K2's display. > The tuner does not attempt to tune. I do not hear the relays changingas I move from band to band. Entering " TUNE " mode is the sameas entering transmit with my straight key. > I have to tap my key or one of the button on the K2 to exit TUNE. > Where does this take us ?? > Thank you Don and Happy New Year: > Jerry N0JRN > > > > > > > First put an in-line wattmeter and a dummy load on the KAT100 ANT1 > connector, set the power to 50 watts and then enter TUNE. > 1) does the tuner tune so no LEDs are lit on the KAT100? If no, how > many are lit? > 2) what is the power indicated on the wattmeter (it should be about 20 > watts)? > > You may have "popped" one or more of the diodes in either the KPA100 or > the KAT100 wattmeter, but the answers to the above questions will > indicate where to look next. > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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