Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Mark, KE6BB via Elecraft 
Re:   "WRU nailed it. I missed it in the original posting.  You're losing 1.7 
volts in 8ft of that "#14 wire"."

That's why Walter is known as "wunder"!  <>

I missed it, too :-(

Mark
ars:  KE6BB 



 Original message 
From: Kevin Stover <kevin.sto...@mediacombb.net> 
Date: 04/17/2016  4:18 PM  (GMT-08:00) 
To: elecraft@mailman.qth.net 
Subject: Re: [Elecraft] KXPA Power Output 

WRU nailed it. I missed it in the original posting.
You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad 
as it gets.
Why didn't you use the power cable supplied with the amp? I believe it's 
#12.
What kind of power supply is running the amp? It has to be 25 amps peak 
*minimum*, I'd say continuous. What else is being run on the same power 
supply?

On 4/17/2016 4:19 PM, Walter Underwood wrote:
>> On Apr 17, 2016, at 11:44 AM, Art Nienhouse <ka9...@gmail.com> wrote:
>>
>> My rest voltage is 14.1 the key down voltage is 12.4 […]. the 14 gauge zip 
>> power cable is what comes with a 100watt Icom the length is 4 foot there is 
>> no loss here that I can see to cause this low power output.
> And there is your problem. The KXPA100 specs say "100 watts at 13.8 V”. It 
> won’t produce 100W at 12.4V.
>
> A 1.7V drop under load is very large. The power supply and wiring cannot 
> supply the required current without dropping the voltage.
>
> Eight feet of 14 gauge wire will have 0.9V drop at 24A. The electricity has 
> to travel over both conductors of the 4 foot wire, which is why we use 8 feet.
>
> It looks like you have some additional problems beside the small power supply 
> cable. Maybe there is resistance in the connectors (poor crimp? not seated?). 
> Maybe the power supply won’t reliably supply 25A. Maybe the line voltage or 
> house wiring has an issue.
>
> I would recommend at least 10 gauge wire and keeping the cables short. 
> PowerWerx offers some useful pre-built cables at good prices.
>
> https://powerwerx.com/adapter-extension-cables
>
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)


-- 
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441



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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Ron D'Eau Claire 
Sure. If I were buying a supply today I'd get a 35A. But the 20A was in hand
and so I used it and I was just sharing my experience with it. 

73 Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Kevin
Stover
Sent: Sunday, April 17, 2016 5:08 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KXPA Power Output

I see your points. I'm just a little more conservative (paranoid) than
others.
I like a little headroom. I've got a pair of RS-35M's that are 24 and 20
years old. I can't kill em.

On 4/17/2016 6:47 PM, Ron D'Eau Claire wrote:
> A quality 20A peak supply is fine. For over a decade I've run a K3 and
then a K3S and, when those aren't on a KX3/KXPA100 off of an Astron 20
without an issue as long as the finals see a decent SWR (current demand
skyrockets as the SWR goes up). At low SWR's none of the rigs exceeds 18 to
19 amps, max.
>
> The 20 means 20A peak current - ICS rated (5 min on 5 min off). That
Astron is rated at 16A continuous but Amateur stuff is almost never
"continuous".
>
> Consider that 20A at 13.8VDC is 276 watts. As long as the rig is not way
below 40% overall efficiency there will be no problem.
>
> That's using a quality linear supply. I'm not so casual about a switcher
or a cheaper supply.
>
> I use the Elecraft supplied power cables on everything.
>
> 73, Ron  AC7AC
>
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
> Kevin Stover
> Sent: Sunday, April 17, 2016 4:19 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] KXPA Power Output
>
> WRU nailed it. I missed it in the original posting.
> You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad as
it gets.
> Why didn't you use the power cable supplied with the amp? I believe it's
#12.
> What kind of power supply is running the amp? It has to be 25 amps peak
*minimum*, I'd say continuous. What else is being run on the same power
supply?
>
> __
> 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 Message delivered to 
> kevin.sto...@mediacombb.net
>


--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Ron D'Eau Claire 
As I said, that’s true if you occasionally drive high SWR loads. There’s no 
downside in normal operation. And with a supply like the Astron, if you 
accidentally overload it, all you need do is cycle the power switch. 

 

73 Ron AC7AC

 

From: Walter Underwood [mailto:wun...@wunderwood.org] 
Sent: Sunday, April 17, 2016 5:05 PM
To: Ron D'Eau Claire; Elecraft Reflector
Subject: Re: [Elecraft] KXPA Power Output

 

Glad that a 20 A supply works for you, but the specs say:

 

"12-15 Vdc (13.8 V nominal), at least 24 A peak capacity. About 1 mA parasitic 
drain current whenever dc power is connected.”

 

So for the least problems, make sure that your supply can deliver 24 A peak, 
not 20 A peak.

 

wunder
K6WRU

Walter Underwood
CM87wj

http://observer.wunderwood.org/ (my blog)

 

On Apr 17, 2016, at 4:47 PM, Ron D'Eau Claire <r...@cobi.biz> wrote:

 

A quality 20A peak supply is fine. For over a decade I've run a K3 and then a 
K3S and, when those aren't on a KX3/KXPA100 off of an Astron 20 without an 
issue as long as the finals see a decent SWR (current demand skyrockets as the 
SWR goes up). At low SWR's none of the rigs exceeds 18 to 19 amps, max. 

The 20 means 20A peak current - ICS rated (5 min on 5 min off). That Astron is 
rated at 16A continuous but Amateur stuff is almost never "continuous".

Consider that 20A at 13.8VDC is 276 watts. As long as the rig is not way below 
40% overall efficiency there will be no problem.

That's using a quality linear supply. I'm not so casual about a switcher or a 
cheaper supply.   

I use the Elecraft supplied power cables on everything. 

73, Ron  AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Kevin 
Stover
Sent: Sunday, April 17, 2016 4:19 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KXPA Power Output

WRU nailed it. I missed it in the original posting.
You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad as it 
gets.
Why didn't you use the power cable supplied with the amp? I believe it's #12.
What kind of power supply is running the amp? It has to be 25 amps peak 
*minimum*, I'd say continuous. What else is being run on the same power supply?

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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Kevin Stover 
I see your points. I'm just a little more conservative (paranoid) than 
others.
I like a little headroom. I've got a pair of RS-35M's that are 24 and 20 
years old. I can't kill em.


On 4/17/2016 6:47 PM, Ron D'Eau Claire wrote:

A quality 20A peak supply is fine. For over a decade I've run a K3 and then a 
K3S and, when those aren't on a KX3/KXPA100 off of an Astron 20 without an 
issue as long as the finals see a decent SWR (current demand skyrockets as the 
SWR goes up). At low SWR's none of the rigs exceeds 18 to 19 amps, max.

The 20 means 20A peak current - ICS rated (5 min on 5 min off). That Astron is rated at 
16A continuous but Amateur stuff is almost never "continuous".

Consider that 20A at 13.8VDC is 276 watts. As long as the rig is not way below 
40% overall efficiency there will be no problem.

That's using a quality linear supply. I'm not so casual about a switcher or a 
cheaper supply.

I use the Elecraft supplied power cables on everything.

73, Ron  AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Kevin 
Stover
Sent: Sunday, April 17, 2016 4:19 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KXPA Power Output

WRU nailed it. I missed it in the original posting.
You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad as it 
gets.
Why didn't you use the power cable supplied with the amp? I believe it's #12.
What kind of power supply is running the amp? It has to be 25 amps peak 
*minimum*, I'd say continuous. What else is being run on the same power supply?

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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Walter Underwood 
Glad that a 20 A supply works for you, but the specs say:

"12-15 Vdc (13.8 V nominal), at least 24 A peak capacity. About 1 mA parasitic 
drain current whenever dc power is connected.”

So for the least problems, make sure that your supply can deliver 24 A peak, 
not 20 A peak.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Apr 17, 2016, at 4:47 PM, Ron D'Eau Claire <r...@cobi.biz> wrote:
> 
> A quality 20A peak supply is fine. For over a decade I've run a K3 and then a 
> K3S and, when those aren't on a KX3/KXPA100 off of an Astron 20 without an 
> issue as long as the finals see a decent SWR (current demand skyrockets as 
> the SWR goes up). At low SWR's none of the rigs exceeds 18 to 19 amps, max. 
> 
> The 20 means 20A peak current - ICS rated (5 min on 5 min off). That Astron 
> is rated at 16A continuous but Amateur stuff is almost never "continuous".
> 
> Consider that 20A at 13.8VDC is 276 watts. As long as the rig is not way 
> below 40% overall efficiency there will be no problem.
> 
> That's using a quality linear supply. I'm not so casual about a switcher or a 
> cheaper supply.   
> 
> I use the Elecraft supplied power cables on everything. 
> 
> 73, Ron  AC7AC
> 
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Kevin 
> Stover
> Sent: Sunday, April 17, 2016 4:19 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] KXPA Power Output
> 
> WRU nailed it. I missed it in the original posting.
> You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad as it 
> gets.
> Why didn't you use the power cable supplied with the amp? I believe it's #12.
> What kind of power supply is running the amp? It has to be 25 amps peak 
> *minimum*, I'd say continuous. What else is being run on the same power 
> supply?
> 
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Ron D'Eau Claire 
A quality 20A peak supply is fine. For over a decade I've run a K3 and then a 
K3S and, when those aren't on a KX3/KXPA100 off of an Astron 20 without an 
issue as long as the finals see a decent SWR (current demand skyrockets as the 
SWR goes up). At low SWR's none of the rigs exceeds 18 to 19 amps, max. 

The 20 means 20A peak current - ICS rated (5 min on 5 min off). That Astron is 
rated at 16A continuous but Amateur stuff is almost never "continuous".

Consider that 20A at 13.8VDC is 276 watts. As long as the rig is not way below 
40% overall efficiency there will be no problem.

That's using a quality linear supply. I'm not so casual about a switcher or a 
cheaper supply.   

I use the Elecraft supplied power cables on everything. 

73, Ron  AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Kevin 
Stover
Sent: Sunday, April 17, 2016 4:19 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KXPA Power Output

WRU nailed it. I missed it in the original posting.
You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad as it 
gets.
Why didn't you use the power cable supplied with the amp? I believe it's #12.
What kind of power supply is running the amp? It has to be 25 amps peak 
*minimum*, I'd say continuous. What else is being run on the same power supply?

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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Kevin Stover 

WRU nailed it. I missed it in the original posting.
You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad 
as it gets.
Why didn't you use the power cable supplied with the amp? I believe it's 
#12.
What kind of power supply is running the amp? It has to be 25 amps peak 
*minimum*, I'd say continuous. What else is being run on the same power 
supply?


On 4/17/2016 4:19 PM, Walter Underwood wrote:

On Apr 17, 2016, at 11:44 AM, Art Nienhouse  wrote:

My rest voltage is 14.1 the key down voltage is 12.4 […]. the 14 gauge zip 
power cable is what comes with a 100watt Icom the length is 4 foot there is no 
loss here that I can see to cause this low power output.

And there is your problem. The KXPA100 specs say "100 watts at 13.8 V”. It 
won’t produce 100W at 12.4V.

A 1.7V drop under load is very large. The power supply and wiring cannot supply 
the required current without dropping the voltage.

Eight feet of 14 gauge wire will have 0.9V drop at 24A. The electricity has to 
travel over both conductors of the 4 foot wire, which is why we use 8 feet.

It looks like you have some additional problems beside the small power supply 
cable. Maybe there is resistance in the connectors (poor crimp? not seated?). 
Maybe the power supply won’t reliably supply 25A. Maybe the line voltage or 
house wiring has an issue.

I would recommend at least 10 gauge wire and keeping the cables short. 
PowerWerx offers some useful pre-built cables at good prices.

https://powerwerx.com/adapter-extension-cables

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)



--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441



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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread David Orman 
Make sure the 3db attenuation switch on the back is set to out/auto, not
in. Had the same problem myself the other day.

David

On Sat, Apr 16, 2016 at 7:29 PM, Tom Field  wrote:

> I'm having difficulty getting more than about 70 to 80 watts out of the
> KXPA 100. I have it connected to a KX3 with the Elecraft cable and have
> gone through the calibration procedure as outlined in the owners manual and
> in Fred Cady's excellent book.
>
> For Example if I go through the calibration procedure on 40 meters,
> It appears to show a drive level of 5 watts to achieve 75 watt output.
> If I transmit into a dummy load, with the power setting at 100 watts,
> I have a drive power of about 2.6 watts and an output power of about 70
> watts as shown in the KXPA Utility.
>
> Am I missing something?
>
> Tom
> KN6DR
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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Walter Underwood 
> On Apr 17, 2016, at 11:44 AM, Art Nienhouse  wrote:
> 
> My rest voltage is 14.1 the key down voltage is 12.4 […]. the 14 gauge zip 
> power cable is what comes with a 100watt Icom the length is 4 foot there is 
> no loss here that I can see to cause this low power output.

And there is your problem. The KXPA100 specs say "100 watts at 13.8 V”. It 
won’t produce 100W at 12.4V.

A 1.7V drop under load is very large. The power supply and wiring cannot supply 
the required current without dropping the voltage.

Eight feet of 14 gauge wire will have 0.9V drop at 24A. The electricity has to 
travel over both conductors of the 4 foot wire, which is why we use 8 feet.

It looks like you have some additional problems beside the small power supply 
cable. Maybe there is resistance in the connectors (poor crimp? not seated?). 
Maybe the power supply won’t reliably supply 25A. Maybe the line voltage or 
house wiring has an issue.

I would recommend at least 10 gauge wire and keeping the cables short. 
PowerWerx offers some useful pre-built cables at good prices.

https://powerwerx.com/adapter-extension-cables

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

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Re: [Elecraft] KXPA Power Output

2016-04-17 Thread Art Nienhouse 
*/I have found that to get a correct (calibration) done using the 
utility and to correct a issue with my K3
KPA500 that developed 2 years after I built it .. I needed to 
use this dummy load for calibration.

https://www.rfparts.com/dummy-loads/dummy-50/m1426.html

All my other dummy loads would not let the Utility Calibrate correctly 
.that said.


After loading the Bata firmware on my KX3 mcu2.32 dsp 1.32 I'm seeing 
issues with power out.
I had a issue with the original first design kit I built had very low 
out put I called customer service was sent a new RF deck which I 
installed my ATU on and tested all bands were 100 or 110 watts except 
the 40 meter band which is where I spend 99 % of my operating on cw.


On 40 the power out was around 85 w and occasionally as high as 89 watts 
but now I see a totally different story.


Watching the operation tab in the utility while running a rag chew full 
QSK I see the input power bouncing from 2.6 watts to 3.1 watts on key 
down it maintains 3.1 watt input Forward power is 82.5 watts out 
reflected is .2 swr is 1.0


I'm thinking something is software has changed the behavior of the amp 
it is advertised as a 100 watt amp it should have no issue getting to 
100 watts


My rest voltage is 14.1 the key down voltage is 12.4  the power supply 
is set to max which is 14.1 the 14 gauge zip power cable is what comes 
with a 100watt Icom the length is 4 foot there is no loss here that I 
can see to cause this low power output.
If I were to install this amp in the car on the battery it would do 60 
watts.


I'm thinking a bit of tweaking to the firmware is necessary to set the 
drive power a bit higher might solve the low power issue.
It's advertized as a 100 watt amp it should do 100 
watts..in a car at 12 volts even.


And I should not need welding cable to supply the amp it voltage from 4 
ft away.


Art
ka9zap



/*
On 4/16/2016 11:33 PM, Tom Field wrote:

Thanks for the replies.
I have gone through the procedure again.
I used the calibration procedure outlined on the Elecraft Website.


Some observations. With no load I have 14.63 volts coming into the KXPA
100.
With the radio and amplifier on and resting, the current is approx 0.3 Amps

Steps
Set the radio in the 160 meter band
Set P Cal
Closed the menu
Set Pwr to CAL 75
Confirmed the KXPA 100 Is in bypass
Pressed Tune( I assume this is the button that says transmit)
Current rose to .9 Amps
If I took the pressure off the button, the current stayed up until I
pressed it again
The display showed 2 numbers  On top 1.1  Below 5.0
Pressed the button again
Normal Display returned
Moved on to 80 meter band
Same behaviour and findings
Moved to 60 meter band
Same
40 meters, 30 meters, 20 meters same with approximately same current
17 meters, Current went up to 1.21 Amps
15 meters 1.24 Amps
12 meters 1.45 Amps
10 meters 1.45 Amps
6 meters
Display showed 3 instead of 5 and 1.68 amps

Opened the menue and turned the PA to on

Set the PA back to auto

set power at 75 Watts
Using the KXPA Utility
 Input Power  Forward Power
160 m 0.848
80 m   1.050
60 m   1.252
40 m   1.251.4
30 m   1.156.8
20 m   1.659.2
17 m   1.682
15 m   1.251
12 m   1.049.5
10 m   1.250.3
6 m 2.060.6

The only band that came close was 17 meters. I wonder if there is something
about the calibration process. Accd to the notes from the Elecraft website
"Press TUNE. The KX3 will transmit for a short while then stop. During this
transmission, the KX3 and KXPA100 will determine what drive level is needed
to get to 75 watts"

I found if I pushed and held TUNE, it started transmitting and did not stop
transmitting until I let off and pushed it again.

Advice, suggestions welcome.

Tom
KN6DR


On Sat, Apr 16, 2016 at 5:29 PM, Tom Field  wrote:


I'm having difficulty getting more than about 70 to 80 watts out of the
KXPA 100. I have it connected to a KX3 with the Elecraft cable and have
gone through the calibration procedure as outlined in the owners manual and
in Fred Cady's excellent book.

For Example if I go through the calibration procedure on 40 meters,
It appears to show a drive level of 5 watts to achieve 75 watt output.
If I transmit into a dummy load, with the power setting at 100 watts,
I have a drive power of about 2.6 watts and an output power of

Re: [Elecraft] KXPA Power Output

2016-04-16 Thread Tom Field 
Thanks for the replies.
I have gone through the procedure again.
I used the calibration procedure outlined on the Elecraft Website.


Some observations. With no load I have 14.63 volts coming into the KXPA
100.
With the radio and amplifier on and resting, the current is approx 0.3 Amps

Steps
Set the radio in the 160 meter band
Set P Cal
Closed the menu
Set Pwr to CAL 75
Confirmed the KXPA 100 Is in bypass
Pressed Tune( I assume this is the button that says transmit)
Current rose to .9 Amps
If I took the pressure off the button, the current stayed up until I
pressed it again
The display showed 2 numbers  On top 1.1  Below 5.0
Pressed the button again
Normal Display returned
Moved on to 80 meter band
Same behaviour and findings
Moved to 60 meter band
Same
40 meters, 30 meters, 20 meters same with approximately same current
17 meters, Current went up to 1.21 Amps
15 meters 1.24 Amps
12 meters 1.45 Amps
10 meters 1.45 Amps
6 meters
Display showed 3 instead of 5 and 1.68 amps

Opened the menue and turned the PA to on

Set the PA back to auto

set power at 75 Watts
Using the KXPA Utility
Input Power  Forward Power
160 m 0.848
80 m   1.050
60 m   1.252
40 m   1.251.4
30 m   1.156.8
20 m   1.659.2
17 m   1.682
15 m   1.251
12 m   1.049.5
10 m   1.250.3
6 m 2.060.6

The only band that came close was 17 meters. I wonder if there is something
about the calibration process. Accd to the notes from the Elecraft website
"Press TUNE. The KX3 will transmit for a short while then stop. During this
transmission, the KX3 and KXPA100 will determine what drive level is needed
to get to 75 watts"

I found if I pushed and held TUNE, it started transmitting and did not stop
transmitting until I let off and pushed it again.

Advice, suggestions welcome.

Tom
KN6DR


On Sat, Apr 16, 2016 at 5:29 PM, Tom Field  wrote:

> I'm having difficulty getting more than about 70 to 80 watts out of the
> KXPA 100. I have it connected to a KX3 with the Elecraft cable and have
> gone through the calibration procedure as outlined in the owners manual and
> in Fred Cady's excellent book.
>
> For Example if I go through the calibration procedure on 40 meters,
> It appears to show a drive level of 5 watts to achieve 75 watt output.
> If I transmit into a dummy load, with the power setting at 100 watts,
> I have a drive power of about 2.6 watts and an output power of about 70
> watts as shown in the KXPA Utility.
>
> Am I missing something?
>
> Tom
> KN6DR
>
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Re: [Elecraft] KXPA Power Output

2016-04-16 Thread Ron D'Eau Claire 
Regarding the procedure in the KXPA100 Owner's manual, does the output
indicate 75 watts when you set the power for 75 watts as the procedure
states? Was that done into a good 50-ohm dummy load? 

How does it behave on other bands? Remember the calibration must be done on
each band and you will need to reset the POWER control for CAL 75 on 50 MHz.


73, Ron AC7AC




-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tom
Field
Sent: Saturday, April 16, 2016 5:30 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KXPA Power Output

I'm having difficulty getting more than about 70 to 80 watts out of the KXPA
100. I have it connected to a KX3 with the Elecraft cable and have gone
through the calibration procedure as outlined in the owners manual and in
Fred Cady's excellent book.

For Example if I go through the calibration procedure on 40 meters, It
appears to show a drive level of 5 watts to achieve 75 watt output.
If I transmit into a dummy load, with the power setting at 100 watts, I have
a drive power of about 2.6 watts and an output power of about 70 watts as
shown in the KXPA Utility.

Am I missing something?

Tom
KN6DR
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delivered to r...@cobi.biz

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Re: [Elecraft] KXPA Power Output

2016-04-16 Thread Nr4c 
You need to do the 70 watt cal with at lest 14 volts at amp power pole. And use 
biggest and shortest cable to minimize losses. Same power setup for operation. 

Sent from my iPhone
...nr4c. bill


> On Apr 16, 2016, at 8:29 PM, Tom Field  wrote:
> 
> I'm having difficulty getting more than about 70 to 80 watts out of the
> KXPA 100. I have it connected to a KX3 with the Elecraft cable and have
> gone through the calibration procedure as outlined in the owners manual and
> in Fred Cady's excellent book.
> 
> For Example if I go through the calibration procedure on 40 meters,
> It appears to show a drive level of 5 watts to achieve 75 watt output.
> If I transmit into a dummy load, with the power setting at 100 watts,
> I have a drive power of about 2.6 watts and an output power of about 70
> watts as shown in the KXPA Utility.
> 
> Am I missing something?
> 
> Tom
> KN6DR
> __
> 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
> Message delivered to n...@widomaker.com

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Re: [Elecraft] KXPA Power Output

2016-04-16 Thread Bob N3MNT 
Look at the actual voltage into the KXPA100 during transmit.  This can happen
if the voltage is below 13.8-14.  I had to adjust my Astron 35 amp as at
13.5V I saw almost the same thing.



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[Elecraft] KXPA Power Output

2016-04-16 Thread Tom Field 
I'm having difficulty getting more than about 70 to 80 watts out of the
KXPA 100. I have it connected to a KX3 with the Elecraft cable and have
gone through the calibration procedure as outlined in the owners manual and
in Fred Cady's excellent book.

For Example if I go through the calibration procedure on 40 meters,
It appears to show a drive level of 5 watts to achieve 75 watt output.
If I transmit into a dummy load, with the power setting at 100 watts,
I have a drive power of about 2.6 watts and an output power of about 70
watts as shown in the KXPA Utility.

Am I missing something?

Tom
KN6DR
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