[K2] KAT100 Current Draw??
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I haven't used my KAT100 in a while, but now that Don has tuned up my K2, I
thought I would try it again. The KAT100 seems to be working and tunes up my antenna -- I'm getting good signal reports. I hooked up a Watts Up meter to the KAT100's power feed (not the K2's feed, but rather the KAT100). While I'm tuning, the Watts Up is showing an average current draw of about 300 mA, but is also showing instantaneous peaks as high as 1100 mA. They must be very short duration, because they are NOT blowing a fast-blow 1 amp fuse that I have in KAT100's feed circuit. I also notice that the Watts Up is reporting instantaneous peaks as high as 2100 mA when I'm transmitting (CW), but again it's not blowing a 1 amp fuse. Is this likely a problem with the Watts Up, a problem with the K2 and/or KAT100, or normal? Thanks. Jon WB2RYV ______________________________________________________________ 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 |
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Jon,
I have never measured the current draw of a KAT100 while tuning, but I imagine 1100 ma is not out of the question - it would depend on how many relays are being activated at a time during the tuning routine. The 300 ma average does seem to be about right, but again will depend on how many relays are active for any one tuning combination. As for the Watts Up showing peaks during transmit - well I would check that meter and also check for RF in the shack. There is no change in the KAT100 relays going from RX to TX, so the current should not change. 73, Don W3FPR On 6/8/2011 8:41 AM, Jon Perelstein wrote: > I haven't used my KAT100 in a while, but now that Don has tuned up my K2, I > thought I would try it again. The KAT100 seems to be working and tunes up > my antenna -- I'm getting good signal reports. > > I hooked up a Watts Up meter to the KAT100's power feed (not the K2's feed, > but rather the KAT100). While I'm tuning, the Watts Up is showing an > average current draw of about 300 mA, but is also showing instantaneous > peaks as high as 1100 mA. They must be very short duration, because they > are NOT blowing a fast-blow 1 amp fuse that I have in KAT100's feed circuit. > I also notice that the Watts Up is reporting instantaneous peaks as high as > 2100 mA when I'm transmitting (CW), but again it's not blowing a 1 amp fuse. > > > Is this likely a problem with the Watts Up, a problem with the K2 and/or > KAT100, or normal? > > 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 |
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In reply to this post by Jon Perelstein
Jon: I can't comment on the KAT100 but I can on fuse ratings. The blowing
current rating varies according to type. For the type fuse I suspect you are using it would be something like 200% (of rating) for 10 seconds. At 110% the blowing time could be minutes. Hope this helps. 73 de Fred, AE6QL -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Jon Perelstein Sent: Wednesday, June 08, 2011 5:42 AM To: elecraft reflector Subject: [Elecraft] [K2] KAT100 Current Draw?? I haven't used my KAT100 in a while, but now that Don has tuned up my K2, I thought I would try it again. The KAT100 seems to be working and tunes up my antenna -- I'm getting good signal reports. I hooked up a Watts Up meter to the KAT100's power feed (not the K2's feed, but rather the KAT100). While I'm tuning, the Watts Up is showing an average current draw of about 300 mA, but is also showing instantaneous peaks as high as 1100 mA. They must be very short duration, because they are NOT blowing a fast-blow 1 amp fuse that I have in KAT100's feed circuit. I also notice that the Watts Up is reporting instantaneous peaks as high as 2100 mA when I'm transmitting (CW), but again it's not blowing a 1 amp fuse. Is this likely a problem with the Watts Up, a problem with the K2 and/or KAT100, or normal? Thanks. Jon WB2RYV ______________________________________________________________ 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 ______________________________________________________________ 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 |
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