Topics

KPA500 Input power vs. output power

Dave Cole
 

Hi,

I got bored today, and graphed the input power vs. the output power of my KPA500 across 160 through 10 meters. I put the results on my web site at:

https://www.nk7z.net/kpa500-input-vs-output-power/

--
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

John Canfield
 

Very interesting Dave, good job. I think your ratio of input power to output power would correlate nicely to my KPA1500.

John WB5THT

Dave Cole
 

Wish I had a KPA1500... :)

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/7/20 5:01 AM, John Canfield wrote:
Very interesting Dave, good job. I think your ratio of input power to output power would correlate nicely to my KPA1500.
John WB5THT

Wes Stewart
 

My complete station runs on one 120VAC 20A circuit.  Out of the question for me.

Wes  N7WS

On Friday, February 7, 2020, 6:34:08 AM MST, Dave Cole <dave@...> wrote:


Wish I had a KPA1500...  :)

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources


Rob Sherwood
 

I would like to know the 1 dB compression point of both Elecraft amps, and others too, for that matter. Here is the general issue that I first ran into in respect to the Beko 2 meter amp. It was a Flex 6700 version that could be driven to 1 KW output with less than +10 dbm. This made it very easy to test for IMD.

The spec on the Beko is odd as it is rated at 1000 watts PEP on SSB, but the 1 dB compression point is specified at 1050 watts! The amp is quite clean at 400 watts PEP, acceptable at 500 watts PEP, and from my perspective unacceptable at 600 watts PEP.

I don’t know if the graphical data just shared is granular enough to extrapolate to the 1 dB compression point. I wonder if the raw spreadsheet data could be made available?

Rob
NC0B

On Feb 7, 2020, at 6:34 AM, Dave Cole <dave@...> wrote:

Wish I had a KPA1500... :)

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/7/20 5:01 AM, John Canfield wrote:
Very interesting Dave, good job. I think your ratio of input power to output power would correlate nicely to my KPA1500.
John WB5THT

Dave Cole
 

Hi Rob,

I would be surprised if the raw date were granular enough to show the 1 db points...

This was a rough graph designed only to help new folks get a feel for the amp. I just put a link on the web page to the spread sheet in the text...

As you can see, it is a very rough dataset, not designed to show 1 db compression points.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/7/20 8:32 AM, Rob Sherwood wrote:
I would like to know the 1 dB compression point of both Elecraft amps, and others too, for that matter. Here is the general issue that I first ran into in respect to the Beko 2 meter amp. It was a Flex 6700 version that could be driven to 1 KW output with less than +10 dbm. This made it very easy to test for IMD.
The spec on the Beko is odd as it is rated at 1000 watts PEP on SSB, but the 1 dB compression point is specified at 1050 watts! The amp is quite clean at 400 watts PEP, acceptable at 500 watts PEP, and from my perspective unacceptable at 600 watts PEP.
I don’t know if the graphical data just shared is granular enough to extrapolate to the 1 dB compression point. I wonder if the raw spreadsheet data could be made available?
Rob
NC0B
On Feb 7, 2020, at 6:34 AM, Dave Cole <dave@...> wrote:

Wish I had a KPA1500... :)

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/7/20 5:01 AM, John Canfield wrote:
Very interesting Dave, good job. I think your ratio of input power to output power would correlate nicely to my KPA1500.
John WB5THT

Rob Sherwood
 

Hi Dave,

Ok, thanks for your quick reply and the spreadsheet link.

Rob, NC0B

On Feb 7, 2020, at 10:15 AM, Dave Cole <dave@...> wrote:

Hi Rob,

I would be surprised if the raw date were granular enough to show the 1 db points...

This was a rough graph designed only to help new folks get a feel for the amp. I just put a link on the web page to the spread sheet in the text...

As you can see, it is a very rough dataset, not designed to show 1 db compression points.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/7/20 8:32 AM, Rob Sherwood wrote:
I would like to know the 1 dB compression point of both Elecraft amps, and others too, for that matter. Here is the general issue that I first ran into in respect to the Beko 2 meter amp. It was a Flex 6700 version that could be driven to 1 KW output with less than +10 dbm. This made it very easy to test for IMD.
The spec on the Beko is odd as it is rated at 1000 watts PEP on SSB, but the 1 dB compression point is specified at 1050 watts! The amp is quite clean at 400 watts PEP, acceptable at 500 watts PEP, and from my perspective unacceptable at 600 watts PEP.
I don’t know if the graphical data just shared is granular enough to extrapolate to the 1 dB compression point. I wonder if the raw spreadsheet data could be made available?
Rob
NC0B
On Feb 7, 2020, at 6:34 AM, Dave Cole <dave@...> wrote:
Wish I had a KPA1500... :)

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/7/20 5:01 AM, John Canfield wrote:
Very interesting Dave, good job. I think your ratio of input power to output power would correlate nicely to my KPA1500.
John WB5THT


Steve
 

Wes,
My entire station, K3s, KPA500, P3 and KAT500 runs off of one 117vac outlet without difficulty.
20 amps at 117 vac is 2340 Watts.  That will easily run a station with power to spare.
Steve
WM6P

Wes Stewart
 

I think you missed my point.

On Saturday, February 8, 2020, 8:10:55 PM MST, Steve <99sunset@...> wrote:


Wes,
My entire station, K3s, KPA500, P3 and KAT500 runs off of one 117vac outlet without difficulty.
20 amps at 117 vac is 2340 Watts.  That will easily run a station with power to spare.
Steve
WM6P

Mike
 

According to the NEC, you should only pull 16 amps maximum from a 20 amp circuit breaker.

Mike

Marsh <marsh308@...>
 

The 80% (standard-rated) breaker can only be applied continuously (defined as 3 hours or more by the NEC) at 80% of its continuous current rating. ... Breakers rated at 80% can be applied at 100% of their rating if the loading will last for less than 3 hours.Jun 11, 2018

In Mike's statement below, "maximum" should be "continuously".

Marsh, KA5M



On Monday, February 24, 2020, 06:54:19 PM CST, Mike via Groups.Io <prcradio@...> wrote:


According to the NEC, you should only pull 16 amps maximum from a 20 amp circuit breaker.

Mike