KPA-1500 Efficiency
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Just curious what other users of the KPA-1500 see as the efficiency
reported by the KPA-1500 utility app. The following efficiencies are being report by my KPA-1500 utility app by band into a dummy load running 40 watts input and 1500 watts output: 80M CW: 61% 80M SSB: 64% 40M CW: 54% 40M SSB: 59% 20M CW: 52% 20M SSB: 52% 17M CW: 55% 15M CW: 64% 15M SSB: 62% 12M CW: 68% 10M CW: 56% 10M SSB: 58% Does this compare favorably with other KPA-1500 owners? Charles K5UA ______________________________________________________________ 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 Message delivered to [hidden email] |
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Just wondering, how much power will the KPA-1500 put into a dummy load?
73 Darrell AB2E ________________________________ From: [hidden email] <[hidden email]> on behalf of [hidden email] <[hidden email]> Sent: Wednesday, August 15, 2018 10:40 PM To: [hidden email] Subject: [Elecraft] KPA-1500 Efficiency Just curious what other users of the KPA-1500 see as the efficiency reported by the KPA-1500 utility app. The following efficiencies are being report by my KPA-1500 utility app by band into a dummy load running 40 watts input and 1500 watts output: 80M CW: 61% 80M SSB: 64% 40M CW: 54% 40M SSB: 59% 20M CW: 52% 20M SSB: 52% 17M CW: 55% 15M CW: 64% 15M SSB: 62% 12M CW: 68% 10M CW: 56% 10M SSB: 58% Does this compare favorably with other KPA-1500 owners? Charles K5UA ______________________________________________________________ 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by charles-2
Are you saying it took exactly 40W input on each band to produce 1500W out..
I find the gain of the amp very different from band to band. For example on 80M mine takes 32W to produce 1500W into a dummy load, and 15M it takes 47W to produce 1500W in to a dummy load. That's a variation of 1.7dB, not very flat. Also as others have reported as the amp warms up the gain decreases a little (requires a bit more drive). - Paul KW7Y At 07:40 PM 8/15/2018, you wrote: >Just curious what other users of the KPA-1500 see as the efficiency >reported by the KPA-1500 utility app. > >The following efficiencies are being report by my KPA-1500 utility >app by band into a dummy load running 40 watts input and 1500 watts output: > >80M CW: 61% >80M SSB: 64% >40M CW: 54% >40M SSB: 59% >20M CW: 52% >20M SSB: 52% >17M CW: 55% >15M CW: 64% >15M SSB: 62% >12M CW: 68% >10M CW: 56% >10M SSB: 58% > >Does this compare favorably with other KPA-1500 owners? > >Charles K5UA >______________________________________________________________ >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 >Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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There's no way 40W drives exactly 1500W on all bands. Here's what I get
into a DL (no tuner). Power measurements based on the LP100 which was calibrated by Larry last year - not what I would call a current cal but certainly better than a generic Bird. Feed with a key-down in CW, with the data taken after about 5 seconds to get a stable reading. Dont' take the values as gospel. There is at least a 50w error range. 160 1644W 80 1466W 40 1515W 20 1436W 15 1371W 10 1414W But it's definitely unrealistic to assume that the amp should have a uniform gain vs. frequency response. The gain is going to be related to many things. There is a LPF hanging off the back and it's insertion loss is a factor - and it's going to drift a touch as it heats up. Theres the front end which likly a pad. The overall gain is be in compliance with the FCC regulation. Most SS amps native gain is such that a few watts is enough to get LL output levels and I'm sure that's the case with the LDMOS even if they have a ton of NFB in the design. Plus the effects of the combiners internally which are definitely not going to be completely flat. And there is some compression that gets to be easily measurable once you hit about the KW level. And temp. And who knows what else. 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com On 15-Aug-18 10:18 PM, Paul Baldock wrote: > Are you saying it took exactly 40W input on each band to produce 1500W > out.. > > I find the gain of the amp very different from band to band. For > example on 80M mine takes 32W to produce 1500W into a dummy load, and > 15M it takes 47W to produce 1500W in to a dummy load. That's a > variation of 1.7dB, not very flat. > > Also as others have reported as the amp warms up the gain decreases a > little (requires a bit more drive). > > - Paul KW7Y > > At 07:40 PM 8/15/2018, you wrote: >> Just curious what other users of the KPA-1500 see as the efficiency >> reported by the KPA-1500 utility app. >> >> The following efficiencies are being report by my KPA-1500 utility >> app by band into a dummy load running 40 watts input and 1500 watts >> output: >> >> 80M CW: 61% >> 80M SSB: 64% >> 40M CW: 54% >> 40M SSB: 59% >> 20M CW: 52% >> 20M SSB: 52% >> 17M CW: 55% >> 15M CW: 64% >> 15M SSB: 62% >> 12M CW: 68% >> 10M CW: 56% >> 10M SSB: 58% >> >> Does this compare favorably with other KPA-1500 owners? >> >> Charles K5UA >> ______________________________________________________________ >> 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 >> Message delivered to [hidden email] > > ______________________________________________________________ > 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 > Message delivered to [hidden email] > ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by charles-2
I would think these RF input versus RF output numbers are reasonable.
Everyone's setup will vary for all bands. I haven't looked at the KPA-1500 Utility in a while, but "real" efficiency of the amplifier is a different calculation. Amp efficiency is Power Input versus Power Output, and per Elecraft that is somewhere around 50% or so. If you had the equipment to measurement the power input, it would be somewhere in the 3000W range I would assume with a 1500W output. That is why the fans are required and the ventilation of the unit is critical, as there is a lot of heat being dissipated to the space as was discussed in other posts. Bill, K8ZCT -- Sent from: http://elecraft.365791.n2.nabble.com/ ______________________________________________________________ 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 Message delivered to [hidden email] |
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