Re: [Elecraft] KX3 and KPA-500
Bob, Of course, you're right. I knew that - somewhere in my head. :-) I'm sure I read it in a post or in the manual. Guess it's a case of old habits dying hard; I find a low-key, low-power dit to make sure everything is on the green -before- I need it in a pile-up, reassuring. Largely unnecessary, it's true; but reassuring none-the-less. It's not a big deal to me one way or the other. But thanks for the reminder. 73 Chris NW6V On Fri, Nov 29, 2013 at 1:58 PM, Robert Friess wrote: > Chris, > > You don't have to go to STBY and send a dit for a band change to avoid hot > switching. When the need to bandswitch is detected, the KPA500 > automatically goes to BYPASS, performs the band change, and then switches > itself back in line all within a small fraction of a second. > > Bob, N6CM > > > On Fri, Nov 29, 2013 at 1:41 PM, Chris Rutkowski > wrote: >> >> Hi George. >> >> I use a KX3 with a KPA500 as my everyday rig. >> >> With the KX3 set for maximum output (12W) into resonant antennas (SWRs >> <1.5:1) in the CW portions of the band I see from 160W on 20M up to >> about 220W on 10M. I don't use SSB often enough to recall, but they in >> a similar range. >> >> Thus the real-world and the math agree. >> >> Operationally, the auto-band changing of the amp allows me to QSY and >> transmit without thinking about the amp - it just tracks nicely. >> However, I -do- usually give the amp a single dit in STBY mode to get >> the band right. No sense hot-switching everything needlessly. >> >> 73 Chris NW6V >> >> > On Thu, Nov 28, 2013 at 12:34 PM, George Rebong >> > wrote: >> > >> >> I would like to try this combination and wonder how many watts will I >> >> get >> >> out in the KPA-500. >> >> Happy Thanks Giving >> >> >> >> 73 >> >> George >> >> >> >> Sent from my iPad 3G >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KX3 and KPA-500
Chris, You don't have to go to STBY and send a dit for a band change to avoid hot switching. When the need to bandswitch is detected, the KPA500 automatically goes to BYPASS, performs the band change, and then switches itself back in line all within a small fraction of a second. Bob, N6CM On Fri, Nov 29, 2013 at 1:41 PM, Chris Rutkowski wrote: > Hi George. > > I use a KX3 with a KPA500 as my everyday rig. > > With the KX3 set for maximum output (12W) into resonant antennas (SWRs > <1.5:1) in the CW portions of the band I see from 160W on 20M up to > about 220W on 10M. I don't use SSB often enough to recall, but they in > a similar range. > > Thus the real-world and the math agree. > > Operationally, the auto-band changing of the amp allows me to QSY and > transmit without thinking about the amp - it just tracks nicely. > However, I -do- usually give the amp a single dit in STBY mode to get > the band right. No sense hot-switching everything needlessly. > > 73 Chris NW6V > > > On Thu, Nov 28, 2013 at 12:34 PM, George Rebong > wrote: > > > >> I would like to try this combination and wonder how many watts will I > get > >> out in the KPA-500. > >> Happy Thanks Giving > >> > >> 73 > >> George > >> > >> Sent from my iPad 3G > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KX3 and KPA-500
Hi George. I use a KX3 with a KPA500 as my everyday rig. With the KX3 set for maximum output (12W) into resonant antennas (SWRs <1.5:1) in the CW portions of the band I see from 160W on 20M up to about 220W on 10M. I don't use SSB often enough to recall, but they in a similar range. Thus the real-world and the math agree. Operationally, the auto-band changing of the amp allows me to QSY and transmit without thinking about the amp - it just tracks nicely. However, I -do- usually give the amp a single dit in STBY mode to get the band right. No sense hot-switching everything needlessly. 73 Chris NW6V > On Thu, Nov 28, 2013 at 12:34 PM, George Rebong wrote: > >> I would like to try this combination and wonder how many watts will I get >> out in the KPA-500. >> Happy Thanks Giving >> >> 73 >> George >> >> Sent from my iPad 3G __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KX3 and KPA-500
I'm getting about 250 watts with ~7.5 watts drive. Works great. However it takes more than 10 watts to get good tune action on the KAT500. ...bill nr4c Sent from my Verizon Wireless 4G LTE DROID George Rebong wrote: >I would like to try this combination and wonder how many watts will I get out >in the KPA-500. >Happy Thanks Giving > >73 >George > >Sent from my iPad 3G >__ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:Elecraft@mailman.qth.net > >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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KX3 and KPA-500
The KPA500 provides between 12 to 14 dB gain depending on the amp and the band. FCC rule 97.317(a)(2) limits the gain of FCC-certified commercially sold amplifiers for the amateur market to 15 dB of gain. My KPA500 has about 12 dB of gain on 20 meters and about 13.5 dB of gain on 10 meters. At 12 dB, on 20 meters, my amp requires 31 watts of K3 exciter power to deliver 500 watts out. As it's (pretty close to) a linear amplifier, you can scale the input and output power linearly from that. 3.1 watts should deliver 50 watts. 6.2 watts should deliver 100 watts. 10 watts should deliver about 160 watts. The KXPA100 has similar gain, up to its 100 watt specified maximum. 73 de Dick, K6KR -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of George Rebong Sent: Thursday, November 28, 2013 12:34 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KX3 and KPA-500 I would like to try this combination and wonder how many watts will I get out in the KPA-500. Happy Thanks Giving 73 George Sent from my iPad 3G __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KX3 and KPA-500
On 11/28/2013 12:34 PM, George Rebong wrote: I would like to try this combination and wonder how many watts will I get out in the KPA-500. Happy Thanks Giving 27W from my K3 gives me 500W out of the KPA500 on 10m. That's ~13dB. If your KX3 delivers 10W, you should see ~200W out. gain[dB] = 10*log[P1/P0] P1 = P0*10^[gain/10] 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KX3 and KPA-500
I don't have that particular combination, but a coworker does and posted some photos of it: https://plus.google.com/113939332173985992126/posts/FSZR2wwzP2n He says he gets 220w out. -- Phil kj6pon On Thu, Nov 28, 2013 at 12:34 PM, George Rebong wrote: > I would like to try this combination and wonder how many watts will I get > out in the KPA-500. > Happy Thanks Giving > > 73 > George > > Sent from my iPad 3G > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KX3 and KPA-500
I would like to try this combination and wonder how many watts will I get out in the KPA-500. Happy Thanks Giving 73 George Sent from my iPad 3G __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
