KPA500 going into standby
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KPA500 going into standby
 
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In working the FQP this weekend, my KPA500 went into Standby on its own a
few times when it was transmitting. I believe it only happened when I was on 10m. Here were the conditions: Transceiver: TS480 Power: appx 400 watts Temp: 54C Current: 10 amps during tx HV: 61 Volts VSWR: 1.4:1 Antenna: 10m monoband yagi What would be a likely cause for this? 73, George, K5KG George Wagner, K5KG Sarasota, FL 34242 941-400-1960 ______________________________________________________________ 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] |
Re: KPA500 going into standby
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>>> Current: 10 amps during tx <<<
Find the reason why the Amp is only getting 10 Amps. ((((73)))) Milverton / W9MMS. From: George via Elecraft <[hidden email]> To: [hidden email] Sent: Monday, April 27, 2015 3:41 PM Subject: [Elecraft] KPA500 going into standby In working the FQP this weekend, my KPA500 went into Standby on its own a few times when it was transmitting. I believe it only happened when I was on 10m. Here were the conditions: Transceiver: TS480 Power: appx 400 watts Temp: 54C Current: 10 amps during tx HV: 61 Volts VSWR: 1.4:1 Antenna: 10m monoband yagi What would be a likely cause for this? 73, George, K5KG George Wagner, K5KG Sarasota, FL 34242 941-400-1960 ______________________________________________________________ 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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I think you will find that 10 amps is about right for 400 watts. The KPA has incredibly good efficiency,
upwards of 60% or so, which supports the value. - Jack B, W6FB > On Apr 27, 2015, at 1:58 PM, Milverton M. Swire via Elecraft <[hidden email]> wrote: > >>>> Current: 10 amps during tx <<< > Find the reason why the Amp is only getting 10 Amps. > ((((73)))) Milverton / W9MMS. > > > From: George via Elecraft <[hidden email]> > To: [hidden email] > Sent: Monday, April 27, 2015 3:41 PM > Subject: [Elecraft] KPA500 going into standby > > In working the FQP this weekend, my KPA500 went into Standby on its own a > few times when it was transmitting. I believe it only happened when I was > on 10m. > > Here were the conditions: > Transceiver: TS480 > Power: appx 400 watts > Temp: 54C > Current: 10 amps during tx > > HV: 61 Volts > VSWR: 1.4:1 > Antenna: 10m monoband yagi > > What would be a likely cause for this? > > 73, George, K5KG > > George Wagner, K5KG > Sarasota, FL 34242 > 941-400-1960 > ______________________________________________________________ > 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] |
Re: KPA500 going into standby
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400 WATTS Divided by 10 Amps input current?!!!!
The maths doesn't compute. ((((73)))) Milverton. From: Jack Brindle <[hidden email]> To: [hidden email] Cc: "[hidden email]" <[hidden email]> Sent: Monday, April 27, 2015 4:26 PM Subject: Re: [Elecraft] KPA500 going into standby I think you will find that 10 amps is about right for 400 watts. The KPA has incredibly good efficiency, upwards of 60% or so, which supports the value. - Jack B, W6FB > On Apr 27, 2015, at 1:58 PM, Milverton M. Swire via Elecraft <[hidden email]> wrote: > >>>> Current: 10 amps during tx <<< > Find the reason why the Amp is only getting 10 Amps. > ((((73)))) Milverton / W9MMS. > > > From: George via Elecraft <[hidden email]> > To: [hidden email] > Sent: Monday, April 27, 2015 3:41 PM > Subject: [Elecraft] KPA500 going into standby > > In working the FQP this weekend, my KPA500 went into Standby on its own a > few times when it was transmitting. I believe it only happened when I was > on 10m. > > Here were the conditions: > Transceiver: TS480 > Power: appx 400 watts > Temp: 54C > Current: 10 amps during tx > > HV: 61 Volts > VSWR: 1.4:1 > Antenna: 10m monoband yagi > > What would be a likely cause for this? > > 73, George, K5KG > > George Wagner, K5KG > Sarasota, FL 34242 > 941-400-1960 > ______________________________________________________________ > 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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Last I checked, 10A at 120V was 1200W....
73, Ross N4RP On 4/27/2015 5:41 PM, Milverton M. Swire via Elecraft wrote: > 400 WATTS Divided by 10 Amps input current?!!!! > The maths doesn't compute. > > ((((73)))) Milverton. > > From: Jack Brindle <[hidden email]> > To: [hidden email] > Cc: "[hidden email]" <[hidden email]> > Sent: Monday, April 27, 2015 4:26 PM > Subject: Re: [Elecraft] KPA500 going into standby > > I think you will find that 10 amps is about right for 400 watts. The KPA has incredibly good efficiency, > upwards of 60% or so, which supports the value. > > - Jack B, W6FB > >> On Apr 27, 2015, at 1:58 PM, Milverton M. Swire via Elecraft <[hidden email]> wrote: >> >>>>> Current: 10 amps during tx <<< >> Find the reason why the Amp is only getting 10 Amps. >> ((((73)))) Milverton / W9MMS. >> >> >> From: George via Elecraft <[hidden email]> >> To: [hidden email] >> Sent: Monday, April 27, 2015 3:41 PM >> Subject: [Elecraft] KPA500 going into standby >> >> In working the FQP this weekend, my KPA500 went into Standby on its own a >> few times when it was transmitting. I believe it only happened when I was >> on 10m. >> >> Here were the conditions: >> Transceiver: TS480 >> Power: appx 400 watts >> Temp: 54C >> Current: 10 amps during tx >> >> HV: 61 Volts >> VSWR: 1.4:1 >> Antenna: 10m monoband yagi >> >> What would be a likely cause for this? >> >> 73, George, K5KG >> >> George Wagner, K5KG >> Sarasota, FL 34242 >> 941-400-1960 >> ______________________________________________________________ >> 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] -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” ______________________________________________________________ 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] |
Re: KPA500 going into standby
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Ooops! My bad.
My calculation was at 12v DC. My mind went on vacation. My humble Apology. ((((73)))) Milverton. From: Ross Primrose <[hidden email]> To: [hidden email]; Jack Brindle <[hidden email]> OOoop Cc: "[hidden email]" <[hidden email]> Sent: Monday, April 27, 2015 4:46 PM Subject: Re: [Elecraft] KPA500 going into standby Last I checked, 10A at 120V was 1200W.... 73, Ross N4RP On 4/27/2015 5:41 PM, Milverton M. Swire via Elecraft wrote: > 400 WATTS Divided by 10 Amps input current?!!!! > The maths doesn't compute. > > ((((73)))) Milverton. > > From: Jack Brindle <[hidden email]> > To: [hidden email] > Cc: "[hidden email]" <[hidden email]> > Sent: Monday, April 27, 2015 4:26 PM > Subject: Re: [Elecraft] KPA500 going into standby > > I think you will find that 10 amps is about right for 400 watts. The KPA has incredibly good efficiency, > upwards of 60% or so, which supports the value. > > - Jack B, W6FB > >> On Apr 27, 2015, at 1:58 PM, Milverton M. Swire via Elecraft <[hidden email]> wrote: >> >>>>> Current: 10 amps during tx <<< >> Find the reason why the Amp is only getting 10 Amps. >> ((((73)))) Milverton / W9MMS. >> >> >> From: George via Elecraft <[hidden email]> >> To: [hidden email] >> Sent: Monday, April 27, 2015 3:41 PM >> Subject: [Elecraft] KPA500 going into standby >> >> In working the FQP this weekend, my KPA500 went into Standby on its own a >> few times when it was transmitting. I believe it only happened when I was >> on 10m. >> >> Here were the conditions: >> Transceiver: TS480 >> Power: appx 400 watts >> Temp: 54C >> Current: 10 amps during tx >> >> HV: 61 Volts >> VSWR: 1.4:1 >> Antenna: 10m monoband yagi >> >> What would be a likely cause for this? >> >> 73, George, K5KG >> >> George Wagner, K5KG >> Sarasota, FL 34242 >> 941-400-1960 >> ______________________________________________________________ >> 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] -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” ______________________________________________________________ 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 Ross Primrose
Except that the output transistors run on 70 volts... 10 amps x 70 volts
= 700 watts input, no? 73, Scott, N9AA On 4/27/15 5:46 PM, Ross Primrose wrote: > Last I checked, 10A at 120V was 1200W.... > > 73, Ross N4RP > > On 4/27/2015 5:41 PM, Milverton M. Swire via Elecraft wrote: >> 400 WATTS Divided by 10 Amps input current?!!!! >> The maths doesn't compute. >> >> ((((73)))) Milverton. >> >> From: Jack Brindle <[hidden email]> >> To: [hidden email] >> Cc: "[hidden email]" <[hidden email]> >> Sent: Monday, April 27, 2015 4:26 PM >> Subject: Re: [Elecraft] KPA500 going into standby >> I think you will find that 10 amps is about right for 400 watts. >> The KPA has incredibly good efficiency, >> upwards of 60% or so, which supports the value. >> >> - Jack B, W6FB >> ______________________________________________________________ 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] |
Re: KPA500 going into standby
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In reply to this post by Elecraft mailing list
>>> HV: 61 Volts <<<
George, question, are you feeding the Amp 61 volts at 10 amps? I'm thinking the TS 480 requires DC Voltage at min of 18 to 22 Amps.Please explain " HV: 61 Volts " ((((73)))) Milverton / W9mms. From: George via Elecraft <[hidden email]> To: [hidden email] Sent: Monday, April 27, 2015 3:41 PM Subject: [Elecraft] KPA500 going into standby In working the FQP this weekend, my KPA500 went into Standby on its own a few times when it was transmitting. I believe it only happened when I was on 10m. Here were the conditions: Transceiver: TS480 Power: appx 400 watts Temp: 54C Current: 10 amps during tx HV: 61 Volts VSWR: 1.4:1 Antenna: 10m monoband yagi What would be a likely cause for this? 73, George, K5KG George Wagner, K5KG Sarasota, FL 34242 941-400-1960 ______________________________________________________________ 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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George,
Did you look at the fault list stored in the KPA500? You'll need the utility program to do that. The KPA500 goes into standby on an error condition (SWR too high etc), so some info may be there for the seekers... A temporary failure (flexing antenna contacts in the wind, a bird landing in the wrong spot on the antenna) would trip the protection algorithm. Rick nhc On 4/27/2015 3:04 PM, Milverton M. Swire via Elecraft wrote: > From: George via Elecraft <[hidden email]> To: > [hidden email] Sent: Monday, April 27, 2015 3:41 PM Subject: > [Elecraft] KPA500 going into standby In working the FQP this weekend, > my KPA500 went into Standby on its own a few times when it was > transmitting. I believe it only happened when I was on 10m. Here > were the conditions: Transceiver: TS480 Power: appx 400 watts Temp: > 54C Current: 10 amps during tx HV: 61 Volts VSWR: 1.4:1 Antenna: 10m > monoband yagi What would be a likely cause for this? 73, George, K5KG > George Wagner, K5KG Sarasota, FL 34242 941-400-1960 ______________________________________________________________ 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] |
Re: KPA500 going into standby
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In reply to this post by Elecraft mailing list
The HV at 61 is the high voltage reading during transmit on the KPA500's
readout. It has nothing to do with the 13.8 DC voltage feeding the TS480. George Wagner, K5KG Sarasota, FL 34242 941-400-1960 In a message dated 4/27/2015 6:04:38 P.M. Eastern Daylight Time, [hidden email] writes: >>> HV: 61 Volts <<< George, question, are you feeding the Amp 61 volts at 10 amps? I'm thinking the TS 480 requires DC Voltage at min of 18 to 22 Amps. Please explain " HV: 61 Volts " ((((73)))) Milverton / W9mms. ____________________________________ From: George via Elecraft <[hidden email]> To: [hidden email] Sent: Monday, April 27, 2015 3:41 PM Subject: [Elecraft] KPA500 going into standby In working the FQP this weekend, my KPA500 went into Standby on its own a few times when it was transmitting. I believe it only happened when I was on 10m. Here were the conditions: Transceiver: TS480 Power: appx 400 watts Temp: 54C Current: 10 amps during tx HV: 61 Volts VSWR: 1.4:1 Antenna: 10m monoband yagi What would be a likely cause for this? 73, George, K5KG George Wagner, K5KG Sarasota, FL 34242 941-400-1960 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email].net_ (mailto:[hidden email]) This list hosted by: _http://www.qsl.net_ (http://www.qsl.net/) Please help support this email list: http://www.qsl.net/donate.html Message delivered to _tnnyswy@yahoo.com_ (mailto:[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] |
Re: KPA500 going into standby
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In reply to this post by Ross Primrose
it would be 10 amps off the 70 v supply From: Ross Primrose <[hidden email]> To: [hidden email]; Jack Brindle <[hidden email]> Cc: "[hidden email]" <[hidden email]> Sent: Monday, April 27, 2015 5:46 PM Subject: Re: [Elecraft] KPA500 going into standby Last I checked, 10A at 120V was 1200W.... 73, Ross N4RP On 4/27/2015 5:41 PM, Milverton M. Swire via Elecraft wrote: > 400 WATTS Divided by 10 Amps input current?!!!! > The maths doesn't compute. > > ((((73)))) Milverton. > > From: Jack Brindle <[hidden email]> > To: [hidden email] > Cc: "[hidden email]" <[hidden email]> > Sent: Monday, April 27, 2015 4:26 PM > Subject: Re: [Elecraft] KPA500 going into standby > > I think you will find that 10 amps is about right for 400 watts. The KPA has incredibly good efficiency, > upwards of 60% or so, which supports the value. > > - Jack B, W6FB > >> On Apr 27, 2015, at 1:58 PM, Milverton M. Swire via Elecraft <[hidden email]> wrote: >> >>>>> Current: 10 amps during tx <<< >> Find the reason why the Amp is only getting 10 Amps. >> ((((73)))) Milverton / W9MMS. >> >> >> From: George via Elecraft <[hidden email]> >> To: [hidden email] >> Sent: Monday, April 27, 2015 3:41 PM >> Subject: [Elecraft] KPA500 going into standby >> >> In working the FQP this weekend, my KPA500 went into Standby on its own a >> few times when it was transmitting. I believe it only happened when I was >> on 10m. >> >> Here were the conditions: >> Transceiver: TS480 >> Power: appx 400 watts >> Temp: 54C >> Current: 10 amps during tx >> >> HV: 61 Volts >> VSWR: 1.4:1 >> Antenna: 10m monoband yagi >> >> What would be a likely cause for this? >> >> 73, George, K5KG >> >> George Wagner, K5KG >> Sarasota, FL 34242 >> 941-400-1960 >> ______________________________________________________________ >> 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] -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” ______________________________________________________________ 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 Scott Manthe-2
The original poster indicated that his KPA500 was reporting 10 amps at 61 volts. That gives a calculation of 610 watts input power.
The amp was indicating 400 watts out, which means an efficiency of 65.6%, which is within the realm of believability for the KPA500. Not bad for our cute amplifier, eh? - Jack, W6FB > On Apr 27, 2015, at 2:54 PM, Scott Manthe <[hidden email]> wrote: > > Except that the output transistors run on 70 volts... 10 amps x 70 volts = 700 watts input, no? > > 73, > Scott, N9AA > > > On 4/27/15 5:46 PM, Ross Primrose wrote: >> Last I checked, 10A at 120V was 1200W.... >> >> 73, Ross N4RP >> >> On 4/27/2015 5:41 PM, Milverton M. Swire via Elecraft wrote: >>> 400 WATTS Divided by 10 Amps input current?!!!! >>> The maths doesn't compute. >>> >>> ((((73)))) Milverton. >>> >>> From: Jack Brindle <[hidden email]> >>> To: [hidden email] >>> Cc: "[hidden email]" <[hidden email]> >>> Sent: Monday, April 27, 2015 4:26 PM >>> Subject: Re: [Elecraft] KPA500 going into standby >>> I think you will find that 10 amps is about right for 400 watts. The KPA has incredibly good efficiency, >>> upwards of 60% or so, which supports the value. >>> >>> - Jack B, W6FB >>> > > ______________________________________________________________ > 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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I humbly suggest using the kpa utility and check the last few faults.
I suspect a spike in the ts-480 tx, a not uncommon occurrance from experience using one here. 73 Gary Vk1ZZ K3, KPA500-FT, KAT500-FT On 28/04/2015 10:23 AM, "Jack Brindle" <[hidden email]> wrote: > The original poster indicated that his KPA500 was reporting 10 amps at 61 > volts. That gives a calculation of 610 watts input power. > The amp was indicating 400 watts out, which means an efficiency of 65.6%, > which is within the realm of believability for the KPA500. > > Not bad for our cute amplifier, eh? > > - Jack, W6FB > > > > On Apr 27, 2015, at 2:54 PM, Scott Manthe <[hidden email]> > wrote: > > > > Except that the output transistors run on 70 volts... 10 amps x 70 volts > = 700 watts input, no? > > > > 73, > > Scott, N9AA > > > > > > On 4/27/15 5:46 PM, Ross Primrose wrote: > >> Last I checked, 10A at 120V was 1200W.... > >> > >> 73, Ross N4RP > >> > >> On 4/27/2015 5:41 PM, Milverton M. Swire via Elecraft wrote: > >>> 400 WATTS Divided by 10 Amps input current?!!!! > >>> The maths doesn't compute. > >>> > >>> ((((73)))) Milverton. > >>> > >>> From: Jack Brindle <[hidden email]> > >>> To: [hidden email] > >>> Cc: "[hidden email]" <[hidden email]> > >>> Sent: Monday, April 27, 2015 4:26 PM > >>> Subject: Re: [Elecraft] KPA500 going into standby > >>> I think you will find that 10 amps is about right for 400 watts. > The KPA has incredibly good efficiency, > >>> upwards of 60% or so, which supports the value. > >>> > >>> - Jack B, W6FB > >>> > > > > ______________________________________________________________ > > 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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