K2 circuit breaker
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Is there any way to test the circuit breaker in a K2 without running the
risk of damaging the rig? I have had the circuit breaker in my Icom PS-30 switching power supply trip a couple of times lately because of high swr on the antenna I was trying to use. The power supply always beats the K2 circuit breaker in opening. Seems to me this should be the other way around? 73 Scott N5SM _________________________________________________________________ Picture this share your photos and you could win big! http://www.GETREALPhotoContest.com?ocid=TXT_TAGHM&loc=us _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Scott,
That sounds like you have a K2/100 there (using a 30 amp? power supply). There is no circuit breaker in the KPA100, but if you are using the supplied power cord, the manual instructs you to add a 20 amp fuse in the power supply lead. The base K2 does have a resettable fuse that acts rather quickly. For my own preference, I would rather rely on the internal power supply circuit breaker (or foldback current limiting or crowbar circuit) than a fuse in the transceiver itself - the breaker in the power supply protects against faults in both the transceiver and the power cable. If you are seeing erratic HI SWR on your antenna, consider that the KPA100 could be oscillating (especially if it happens on 40 meters) - if that is suspected, I recommend that you add the KPA100UPKT. If your KPA100 kit was shipped after last December, it already has the upgrade, but if it is earlier, it is wise to add it. 73, Don W3FPR Scott McDowell wrote: > Is there any way to test the circuit breaker in a K2 without running the > risk of damaging the rig? > > I have had the circuit breaker in my Icom PS-30 switching power supply > trip a couple of times > lately because of high swr on the antenna I was trying to use. The power > supply always beats > the K2 circuit breaker in opening. Seems to me this should be the other > way around? > 73 > Scott N5SM > > _________________________________________________________________ > Picture this – share your photos and you could win big! > http://www.GETREALPhotoContest.com?ocid=TXT_TAGHM&loc=us > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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Normal fuses are rated such that when 2.1 times their nominal current rating
is passed they will break within 30s. So, a normal 20A fuse will not break until it is passing >40A and even then it will take a long time to go, enough to fry the rig. The fuse is there to protect the cable when a gross overload occurs, eg a dead short across the power cable entry; perhaps when you drop a spanner in the works : o ( David G3UNA _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Don Wilhelm-3
On Friday 08 June 2007 01:18, Don Wilhelm wrote:
> If you are seeing erratic HI SWR on your antenna, consider that the > KPA100 could be oscillating (especially if it happens on 40 meters) - if > that is suspected, I recommend that you add the KPA100UPKT. If your > KPA100 kit was shipped after last December, it already has the upgrade, > but if it is earlier, it is wise to add it. Nr 5901 was shipped on 13th December 2006. Would it contain the upgrade? Charles - M0BIN _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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On Friday 08 June 2007 09:46, charles wrote:
> On Friday 08 June 2007 01:18, Don Wilhelm wrote: > > If you are seeing erratic HI SWR on your antenna, consider that the > > KPA100 could be oscillating (especially if it happens on 40 meters) - if > > that is suspected, I recommend that you add the KPA100UPKT. If your > > KPA100 kit was shipped after last December, it already has the upgrade, > > but if it is earlier, it is wise to add it. > > Nr 5901 was shipped on 13th December 2006. > Would it contain the upgrade? I was a bit too hasty in sending off the above. I realized after sending that I should have clarified that 5901 is a K2/100 :o) The manual for the KPA100 that I have is Rev D dated September 22 2006. I asked the original question above because the K2 and the KPA100 were shipped prior to the end of last December and therefore may require the KPA100UPKT upgrade. Charles - M0BIN _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by charles-70
Charles,
It would contain the upgrade (and should have blue toroids for L16 and RFC1, L15 not populated). BUT - do check the value of C31. If C31 is .22uf you have *all* the latest pieces, but if C31 is a 33nf cap, then you have one of those troublesome 'intermediate' KPA100 kits that were shipped before the C31 problem was discovered. 73, Don W3FPR charles wrote: > On Friday 08 June 2007 01:18, Don Wilhelm wrote: >> If you are seeing erratic HI SWR on your antenna, consider that the >> KPA100 could be oscillating (especially if it happens on 40 meters) - if >> that is suspected, I recommend that you add the KPA100UPKT. If your >> KPA100 kit was shipped after last December, it already has the upgrade, >> but if it is earlier, it is wise to add it. > > Nr 5901 was shipped on 13th December 2006. > Would it contain the upgrade? > > Charles - M0BIN Elecraft mailing list Post to: [hidden email] 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 |
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