The KPA500 is a great Amp. but it does not like SWR over 1:5 –1 an band width seems narrow . How have you handled this with you antenna’s . Is anyone using a tuner any suggestion will be apreciated
Don W4DEE ______________________________________________________________ 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 |
On 2/13/2012 11:51 AM, Don Etters wrote:
> The KPA500 is a great Amp. but it does not like SWR over 1:5 –1 Mine works fine up to 2:1 on most bands, although on 160, it starts to get a little annoyed at that point. Pretty common for "no-tune" solid state amps. an > band width seems narrow . Don't know what you mean by this. My 160 antenna BW is pretty narrow [10 KHz], 80m is better [~50 KHz] but that has nothing to do with the KPA500, into the 1:1 dummy load, frequency doesn't matter. The SWR seen by the K3 looking into the KPA500 is 1:1 all over all the bands too. How have you handled this with you > antenna’s . Is anyone using a tuner I use some wires multi-band, so yes, I use a tuner, especially on 30, 40, 80, and 160. Haven't tried the antennas on 60m but probably will after 5 Mar since CW will be allowed then. Waiting with credit card "on warm" for the KAT500 announcement. Hope this helps, 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org ______________________________________________________________ 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 |
In reply to this post by Don Etters
Please explain what you meant by "band width seems narrow". Thanks, 73, Tom Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member "Only the white eyes would believe they could cut the top off a blanket, sew it to the bottom and have a longer blanket." -- American Indian comment about Daylight Saving Time -- On Mon, 13 Feb 2012 14:51:20 -0500, "Don Etters" <[hidden email]> wrote: >The KPA500 is a great Amp. but it does not like SWR over 1:5 1 an band width seems narrow . How have you handled this with you antennas . Is anyone using a tuner any suggestion will be apreciated > >Don >W4DEE >______________________________________________________________ [snip] ______________________________________________________________ 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 Don Etters
The KPA500 fold back point in firmware is an SWR of 2:1 at its rated
output of 500W. (This is based on reflected power and will occur at lower SWRs if the amp is operated above 500W) At that point it first inserts a 3 dB input attenuator and flashes the fault LED. (This is a soft fault.) Slightly reducing drive will reset this back to full gain. What rig are you driving the KPA500 with? 73, Eric --- www.elecraft.com On 2/13/2012 11:51 AM, Don Etters wrote: > The KPA500 is a great Amp. but it does not like SWR over 1:5 –1 an band width seems narrow . How have you handled this with you antenna’s . Is anyone using a tuner any suggestion will be apreciated > > Don > W4DEE > ______________________________________________________________ > 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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