
K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Good. 35 watts of drive from my K3 drives my Alpha 8410 to legal limit power. Chris NU1O
Good. 35 watts of drive from my K3 drives my Alpha 8410 to legal limit power. Chris NU1O

By
Christopher Scibelli
· #32034
·


K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
FCC max gain for amps is 15 dB. Ray W8LYJ
FCC max gain for amps is 15 dB. Ray W8LYJ

By
Ray
· #32042
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
I think that was a typo  I'm sure he meant 1500 watts out.
I think that was a typo  I'm sure he meant 1500 watts out.

By
...
· #32039
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Re dummy load. First measure it with an ohm meter. It should measure 50 ohms +/ 5% or better. Then measure it with your antenna bridge from the lowest to highest frequency you intend to use. An MFJ2
Re dummy load. First measure it with an ohm meter. It should measure 50 ohms +/ 5% or better. Then measure it with your antenna bridge from the lowest to highest frequency you intend to use. An MFJ2

By
Bob McGraw  K4TAX
· #32059
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
That display should be indicating OUTPUT power. I suggest you use an external meter of known accuracy and a 50 ohm dummy load of known accuracy. Measure both the input to the amp from the transceiver
That display should be indicating OUTPUT power. I suggest you use an external meter of known accuracy and a 50 ohm dummy load of known accuracy. Measure both the input to the amp from the transceiver

By
Bob McGraw  K4TAX
· #32044
·


K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
I have only received my KPA1500 recently, But I decided to put it through the paces with the K3S being the exciter. I found that into a Cantenna Dummy Load that has not been tested for 50 Ohm impedanc
I have only received my KPA1500 recently, But I decided to put it through the paces with the K3S being the exciter. I found that into a Cantenna Dummy Load that has not been tested for 50 Ohm impedanc

By
Mike VE3YF
· #32058
·


K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Hey guys, Thursday the Brown Santa (UPS) delivered my birthday present for the next ten years  a KPA1500 amp. I'm slowly learning how to use it and I'm not sure if things are acting right. Going dire
Hey guys, Thursday the Brown Santa (UPS) delivered my birthday present for the next ten years  a KPA1500 amp. I'm slowly learning how to use it and I'm not sure if things are acting right. Going dire

By
...
· #32028
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Thanks Adrian!
By
...
· #32030
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
I would expect it designed that way for best IMD results and cleanest signal quality. The K3 specs would be best at that low wattage. I use to run mine at 15v under load for best results. Adrian , vk4
I would expect it designed that way for best IMD results and cleanest signal quality. The K3 specs would be best at that low wattage. I use to run mine at 15v under load for best results. Adrian , vk4

By
...
· #32029
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Yes the K3 is cleanest around 35 watts. No I never tested it at 30 watts vs. 35 watts, etc. I doubt you could tell the difference. Rob, NC0B
Yes the K3 is cleanest around 35 watts. No I never tested it at 30 watts vs. 35 watts, etc. I doubt you could tell the difference. Rob, NC0B

By
Rob Sherwood
· #32031
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
In doing the math, 28 watts to 1500 watts is 17.3 dB gain, while 5 watts to 150 watts is 14.8 dB gain, and 5 watts to 200 watts is 16.0 dB gain. The point is the amp appears to be operating normally w
In doing the math, 28 watts to 1500 watts is 17.3 dB gain, while 5 watts to 150 watts is 14.8 dB gain, and 5 watts to 200 watts is 16.0 dB gain. The point is the amp appears to be operating normally w

By
Bob McGraw  K4TAX
· #32032
·


K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Thanks again guys and thanks Bob for the numbers. I wasn't making notes when tracking drive vs. output power  just a fairly gross report of what I was seeing. The entire reason for my question is my
Thanks again guys and thanks Bob for the numbers. I wasn't making notes when tracking drive vs. output power  just a fairly gross report of what I was seeing. The entire reason for my question is my

By
...
· #32033
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Sounds friggin' awesome! ______________________ Clay Autery, KY5G (318) 5181389 On 02/02/20 08:53, John Canfield wrote:
Sounds friggin' awesome! ______________________ Clay Autery, KY5G (318) 5181389 On 02/02/20 08:53, John Canfield wrote:

By
Clay Autery
· #32035
·


K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
About 25  30 watts for 1500 watts input. Jim K7EG
About 25  30 watts for 1500 watts input. Jim K7EG

By
Jim Denneny
· #32037
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Jim, Can you clarify what you mean by 1500 watts input ? I thought that 1500 watts was the output figure on the amp with that drive, and that the input value would be much higher allowing for efficien
Jim, Can you clarify what you mean by 1500 watts input ? I thought that 1500 watts was the output figure on the amp with that drive, and that the input value would be much higher allowing for efficien

By
...
· #32038
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K3s driving a KPA1500  how much drive power is nominal for 1500 watts?
#kpa1500
Adrian, I mean 1500W as indicated on the led power bar whatever that means  input / output. 73, Jim K7EG
Adrian, I mean 1500W as indicated on the led power bar whatever that means  input / output. 73, Jim K7EG

By
Jim Denneny
· #32043
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KPA1500 Temperature Management
#kpa1500
For what it's worth, I run my KPA1500 "stock" (no fan modifications or management). On some of the 6 meter openings this summer, I'd be transmitting 15 on /15 off for over an hour straight. At full bo
For what it's worth, I run my KPA1500 "stock" (no fan modifications or management). On some of the 6 meter openings this summer, I'd be transmitting 15 on /15 off for over an hour straight. At full bo

By
Scott Townley
· #35728
·


KPA1500 Temperature Management
#kpa1500
Thanks all for your suggestions and replies. I am more comfortable now accepting Elecraftâ€™s technology to protect the amp from over heating. One change here, I relocated the amp to provide much better
Thanks all for your suggestions and replies. I am more comfortable now accepting Elecraftâ€™s technology to protect the amp from over heating. One change here, I relocated the amp to provide much better

By
David Mackey
· #35727
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KPA1500 Temperature Management
#kpa1500
I just added a KPA1500 to the shack, and I am unsure about how much I should worry about temperature management. I know the maximum specified in the specs is 110C, but that does seem very high. The fa
I just added a KPA1500 to the shack, and I am unsure about how much I should worry about temperature management. I know the maximum specified in the specs is 110C, but that does seem very high. The fa

By
David Mackey
· #35702
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KPA1500 Temperature Management
#kpa1500
K6XX, a neighbor and good friend, is the engineer for Elecraft tasked with putting both of Elecraft's amps into production. We are both contesters, and I do a lot of WSJT modes on 6M and 160M. Bob adv
K6XX, a neighbor and good friend, is the engineer for Elecraft tasked with putting both of Elecraft's amps into production. We are both contesters, and I do a lot of WSJT modes on 6M and 160M. Bob adv

By
Jim Brown
· #35704
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