Help - Fluctuating output power ok K2
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I just finished SN 5319 a few days ago and all is working perfectly except that the output power fluctuates. The radio is stock with no options. It will not fluctuate while the radio is transmitting a solid carrier, but as soon as you unkey and start sending a carrier again, the power will drop or jump several watts. It is as if the power control was changed but it was not. It does it on all bands. It does it into a dummy load or an antenna. The current limiter has been ruled out because it is set for 3.5 and the current is not exceeding 3.0. There is not voltage drop on the power supply so I also ruled out a power supply issue. it is just as if the ALC is kicking in and turning down the power randomly. When the output power drops, the current also drops accordingly.
The radio seems to work perfectly otherwise. Your suggestions are greatly appreciated. Dean KG7MZ _______________________________________________ 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 |
RE: Help - Fluctuating output power ok K2
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Dean,
First I must ask - have you done anything between the keyup and the next keydown? For instance, if you change bands, the K2 must reset its power sensing circuits to determine the new value of ALC that must be applied to maintain the requested power output. This is normal. OTOH, if you are experiencing this power fluctuation when no buttons have been pushed (or knobs moved) on the K2, then you may have a problem with either the power sensing circuit or the ALC circuit - check the soldering first. 73, Don W3FPR > -----Original Message----- > > I just finished SN 5319 a few days ago and all is working > perfectly except that the output power fluctuates. The radio is > stock with no options. It will not fluctuate while the radio is > transmitting a solid carrier, but as soon as you unkey and start > sending a carrier again, the power will drop or jump several > watts. It is as if the power control was changed but it was not. > It does it on all bands. It does it into a dummy load or an > antenna. The current limiter has been ruled out because it is set > for 3.5 and the current is not exceeding 3.0. There is not > voltage drop on the power supply so I also ruled out a power > supply issue. it is just as if the ALC is kicking in and turning > down the power randomly. When the output power drops, the current > also drops accordingly. > > The radio seems to work perfectly otherwise. > > Your suggestions are greatly appreciated. > > Dean > KG7MZ > _______________________________________________ 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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Hi
I thought I had a similarly problem with my recent build K2 (5324) but it was me, if your using the Tune Button to key the transmitter you will find this happens just as you have written, the tune button bypasses the power control circuits and the power level will jump all over the place , the power control will seem to be very erratic and not smooth, if this is the case for you, plug a key in the k2 and use that, when I did it was perfect. I hope that’s your problem too. Good luck Paul M0BMN > -----Original Message----- > > I just finished SN 5319 a few days ago and all is working > perfectly except that the output power fluctuates. The radio is > stock with no options. It will not fluctuate while the radio is > transmitting a solid carrier, but as soon as you unkey and start > sending a carrier again, the power will drop or jump several > watts. It is as if the power control was changed but it was not. > It does it on all bands. It does it into a dummy load or an > antenna. The current limiter has been ruled out because it is set > for 3.5 and the current is not exceeding 3.0. There is not > voltage drop on the power supply so I also ruled out a power > supply issue. it is just as if the ALC is kicking in and turning > down the power randomly. When the output power drops, the current > also drops accordingly. > > The radio seems to work perfectly otherwise. > > Your suggestions are greatly appreciated. > > Dean > KG7MZ > _______________________________________________ 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 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.2/251 - Release Date: 04/02/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.2/251 - Release Date: 04/02/2006 ___________________________________________________________ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.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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