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[K3] K3 #281 Perceived Output Issue

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Ian Kahn, KM4IK

[K3] K3 #281 Perceived Output Issue

All,

I have what I think is an output issue with my K3 s/n 281. When set at 100W
output, I am getting the following approximate output values:

10m ~55w
12m ~40w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

My testing methodology involved connecting the short (~12") coax out of
ANT1 to an HF power meter's input. I then connected the power meter's
output to a 300w dummy load. I then tuned to the band to test, put the rig
in CW mode, and keyed down for a few seconds. The power meter is set to
read peak output, not average output. As a self-check, I would randomly run
the test using AFSK-A RTTY, just as a double-check to ensure I was getting
100% duty cycle. The results are the same.

After discovering these power output values, I ran the TX Gain Calibration
via the K3 utility. It ran through the 5w and 50w calibration tests
successfully. After running the TX Gain Calibration, my output power
readings didn't change significantly. My readings then are:

10m ~50w
12m ~60w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

Is there something else I should check before I plan a call back to the
Elecraft mother ship next week? If it needs to go home for repair and
testing, it will have to wait until after the Georgia QSO Party the second
weekend in April. I'm getting good signal reports when I'm on the air, but
it seems odd to me that, with the rig set for 100w out, and in a full duty
cycle mode, I'm only getting 50%-70% of my rated power.

Thank and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468
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Ian Kahn, KM4IK

Fwd: [K3] K3 #281 Perceived Output Issue

Reposting, since this didn't seem to get out when I originally sent it last
Friday evening. If you get this a second time, please forgive the noise.

Thanks and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468

---------- Forwarded message ----------
From: Ian Kahn <[hidden email]>
Date: Fri, Feb 19, 2016 at 10:37 PM
Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
To: "[hidden email]" <[hidden email]>

All,

I have what I think is an output issue with my K3 s/n 281. When set at 100W
output, I am getting the following approximate output values:

10m ~55w
12m ~40w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

My testing methodology involved connecting the short (~12") coax out of
ANT1 to an HF power meter's input. I then connected the power meter's
output to a 300w dummy load. I then tuned to the band to test, put the rig
in CW mode, and keyed down for a few seconds. The power meter is set to
read peak output, not average output. As a self-check, I would randomly run
the test using AFSK-A RTTY, just as a double-check to ensure I was getting
100% duty cycle. The results are the same.

After discovering these power output values, I ran the TX Gain Calibration
via the K3 utility. It ran through the 5w and 50w calibration tests
successfully. After running the TX Gain Calibration, my output power
readings didn't change significantly. My readings then are:

10m ~50w
12m ~60w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

Is there something else I should check before I plan a call back to the
Elecraft mother ship next week? If it needs to go home for repair and
testing, it will have to wait until after the Georgia QSO Party the second
weekend in April. I'm getting good signal reports when I'm on the air, but
it seems odd to me that, with the rig set for 100w out, and in a full duty
cycle mode, I'm only getting 50%-70% of my rated power.

Thank and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Jerry Moore

Re: Fwd: [K3] K3 #281 Perceived Output Issue

Do you have the internal ATU?
What are you using for a power meter?
If using external is it indicating any SWR?

If you have the internal ATU, Press and hold ATU Tune until It indicates
"BYPASS", THEN test for power... repeat for each band under test
Repeat the tests again now with the ATU inline, however, Press and Hold 'ATU
TUNE' until it indicates "AUTO", then momentarily press 'ATU TUNE', THEN
test for power.. repeat for each band under test.

If you don't have an ATU test /check antenna selection AND internal jumpers.
Ensure ANT1 is selected AND is actually inline. It's possible the internal
cable is switched between ANT1 and ANT2.

Just ideas/suggestions.

Jerry Moore
CDXA, INDEXA, SKCC, Fists
AE4PB, K3S - S.N. 010324
http://www.qrz.com/db/AE4PB
An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and
Patriotic.

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Ian
Kahn
Sent: Monday, February 22, 2016 11:22 AM
To: [hidden email]
Subject: [Elecraft] Fwd: [K3] K3 #281 Perceived Output Issue

Reposting, since this didn't seem to get out when I originally sent it last
Friday evening. If you get this a second time, please forgive the noise.

Thanks and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038 PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468

---------- Forwarded message ----------
From: Ian Kahn <[hidden email]>
Date: Fri, Feb 19, 2016 at 10:37 PM
Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
To: "[hidden email]" <[hidden email]>

All,

I have what I think is an output issue with my K3 s/n 281. When set at 100W
output, I am getting the following approximate output values:

10m ~55w
12m ~40w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

My testing methodology involved connecting the short (~12") coax out of
ANT1 to an HF power meter's input. I then connected the power meter's output
to a 300w dummy load. I then tuned to the band to test, put the rig in CW
mode, and keyed down for a few seconds. The power meter is set to read peak
output, not average output. As a self-check, I would randomly run the test
using AFSK-A RTTY, just as a double-check to ensure I was getting 100% duty
cycle. The results are the same.

After discovering these power output values, I ran the TX Gain Calibration
via the K3 utility. It ran through the 5w and 50w calibration tests
successfully. After running the TX Gain Calibration, my output power
readings didn't change significantly. My readings then are:

10m ~50w
12m ~60w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

Is there something else I should check before I plan a call back to the
Elecraft mother ship next week? If it needs to go home for repair and
testing, it will have to wait until after the Georgia QSO Party the second
weekend in April. I'm getting good signal reports when I'm on the air, but
it seems odd to me that, with the rig set for 100w out, and in a full duty
cycle mode, I'm only getting 50%-70% of my rated power.

Thank and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038 PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
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delivered to [hidden email]

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N7FN

Re: Fwd: [K3] K3 #281 Perceived Output Issue

In reply to this post by Ian Kahn, KM4IK

I saw this and have been monitoring for an answer. I have a similar problem
also.
Hope that someone can provide some insight as to what the problem might be.

Frank Noragon
N7FN, Portland, Oregon

-----Original Message-----
From: Ian Kahn
Sent: Monday, February 22, 2016 08:21
To: [hidden email]
Subject: [Elecraft] Fwd: [K3] K3 #281 Perceived Output Issue

Reposting, since this didn't seem to get out when I originally sent it last
Friday evening. If you get this a second time, please forgive the noise.

Thanks and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468

---------- Forwarded message ----------
From: Ian Kahn <[hidden email]>
Date: Fri, Feb 19, 2016 at 10:37 PM
Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
To: "[hidden email]" <[hidden email]>

All,

I have what I think is an output issue with my K3 s/n 281. When set at 100W
output, I am getting the following approximate output values:

10m ~55w
12m ~40w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

My testing methodology involved connecting the short (~12") coax out of
ANT1 to an HF power meter's input. I then connected the power meter's
output to a 300w dummy load. I then tuned to the band to test, put the rig
in CW mode, and keyed down for a few seconds. The power meter is set to
read peak output, not average output. As a self-check, I would randomly run
the test using AFSK-A RTTY, just as a double-check to ensure I was getting
100% duty cycle. The results are the same.

After discovering these power output values, I ran the TX Gain Calibration
via the K3 utility. It ran through the 5w and 50w calibration tests
successfully. After running the TX Gain Calibration, my output power
readings didn't change significantly. My readings then are:

10m ~50w
12m ~60w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

Is there something else I should check before I plan a call back to the
Elecraft mother ship next week? If it needs to go home for repair and
testing, it will have to wait until after the Georgia QSO Party the second
weekend in April. I'm getting good signal reports when I'm on the air, but
it seems odd to me that, with the rig set for 100w out, and in a full duty
cycle mode, I'm only getting 50%-70% of my rated power.

Thank and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468
______________________________________________________________
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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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Elecraft mailing list

Re: Fwd: [K3] K3 #281 Perceived Output Issue

In reply to this post by Ian Kahn, KM4IK

What meter are you using to measure your output with?
Are you sure your load is correct?

From: Ian Kahn <[hidden email]>
To: "[hidden email]" <[hidden email]>
Sent: Monday, February 22, 2016 11:21 AM
Subject: [Elecraft] Fwd: [K3] K3 #281 Perceived Output Issue

Reposting, since this didn't seem to get out when I originally sent it last
Friday evening. If you get this a second time, please forgive the noise.

Thanks and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468

---------- Forwarded message ----------
From: Ian Kahn <[hidden email]>
Date: Fri, Feb 19, 2016 at 10:37 PM
Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
To: "[hidden email]" <[hidden email]>

All,

I have what I think is an output issue with my K3 s/n 281. When set at 100W
output, I am getting the following approximate output values:

10m ~55w
12m ~40w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

My testing methodology involved connecting the short (~12") coax out of
ANT1 to an HF power meter's input. I then connected the power meter's
output to a 300w dummy load. I then tuned to the band to test, put the rig
in CW mode, and keyed down for a few seconds. The power meter is set to
read peak output, not average output. As a self-check, I would randomly run
the test using AFSK-A RTTY, just as a double-check to ensure I was getting
100% duty cycle. The results are the same.

After discovering these power output values, I ran the TX Gain Calibration
via the K3 utility. It ran through the 5w and 50w calibration tests
successfully. After running the TX Gain Calibration, my output power
readings didn't change significantly. My readings then are:

10m ~50w
12m ~60w
15m ~50w
17m ~60w
20m ~60w
40m ~70w
80m ~70w
160m ~70w

Is there something else I should check before I plan a call back to the
Elecraft mother ship next week? If it needs to go home for repair and
testing, it will have to wait until after the Georgia QSO Party the second
weekend in April. I'm getting good signal reports when I'm on the air, but
it seems odd to me that, with the rig set for 100w out, and in a full duty
cycle mode, I'm only getting 50%-70% of my rated power.

Thank and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

______________________________________________________________
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Don Wilhelm-4

Re: Fwd: [K3] K3 #281 Perceived Output Issue

In reply to this post by Ian Kahn, KM4IK

Ian,

Did you upgrade after MCU version from 5.13 or below to 5.14 or greater?
That requires you to do the TX Gain Calibration (see 5.14 Release
Notes). K3 Utility makes the task easy - just connect a dummy load that
is good for 1.8 to 54 MHz and capable of 50 watts or greater and the
process is automatic - follow the prompts in K3 Utility, it will take
only about 2 minutes to complete after the dummy load is in place.

If K3 Utility fails the TX Gain, there is one more chance - do each band
manually (see the Calibration part of the manual).

If that does not correct it, contact support.

73,
Don W3FPR

On 2/22/2016 11:21 AM, Ian Kahn wrote:

> Reposting, since this didn't seem to get out when I originally sent it last
> Friday evening. If you get this a second time, please forgive the noise.
>
> Thanks and 73,
>
> --Ian
> Ian Kahn, KM4IK
> Roswell, GA EM74ua
> [hidden email]
> 10-10 #74624 North Georgia Chapter #2038
> PODXS 070 #1962
> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>
> ---------- Forwarded message ----------
> From: Ian Kahn <[hidden email]>
> Date: Fri, Feb 19, 2016 at 10:37 PM
> Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
> To: "[hidden email]" <[hidden email]>
>
>
> All,
>
> I have what I think is an output issue with my K3 s/n 281. When set at 100W
> output, I am getting the following approximate output values:
>
> 10m ~55w
> 12m ~40w
> 15m ~50w
> 17m ~60w
> 20m ~60w
> 40m ~70w
> 80m ~70w
> 160m ~70w
>
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Ian Kahn, KM4IK

Re: K3 #281 Perceived Output Issue

Several people offered some very good suggestions and asked several valid
questions about my testing. Here are answers to many of those questions:

1. The meter I'm using in the test is a known-good MFJ-815B HF power/SWR
meter.
2. I'm using a known-good 300W dummy load for my "antenna", so any
reflected power is minimal, as is SWR.
3. I do have the internal ATU installed, but it is in BYPASS, as I have a
resonant antenna on 20m-10m and use the KAT500 for 40m/80m, or when I run
power.
4. Test results at lower power levels:

10m 10w out - 10w on meter; 25w out - 19-20w on meter; 50w out - ~30w on
meter
12m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 30w on meter
15m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 35w on meter
17m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 35w on meter
20m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
40m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
80m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter

I also ran the TX Gain Calibration from the K3 utility one more time, with
a different cable. Here are the results of that calibration (note - I
didn't run the milliwatt calibration because I don't use a transverter with
the IF Out. It just goes to my P3):

K3 Tx Gain Calibration data written on 2016-02-23 at 22:18:30
K3 Serial Number 00281
K3 MCU revision 05.38. RS-232 speed 38400 bit/s.
Elecraft K3 Utility Revision 1.15.8.18
1900 kHz TxGain LP 52
3750 kHz TxGain LP 30
5336 kHz TxGain LP 56
7150 kHz TxGain LP 46
10125 kHz TxGain LP 52
14200 kHz TxGain LP 23
18110 kHz TxGain LP 24
21200 kHz TxGain LP 19
24930 kHz TxGain LP 25
29000 kHz TxGain LP 30
52000 kHz TxGain LP 24
1900 kHz TxGain HP 46
3750 kHz TxGain HP 48
5336 kHz TxGain HP 87
7150 kHz TxGain HP 62
10125 kHz TxGain HP 58
14200 kHz TxGain HP 28
18110 kHz TxGain HP 21
21200 kHz TxGain HP 18
24930 kHz TxGain HP 18
29000 kHz TxGain HP 27
52000 kHz TxGain HP 13

After running the TX Gain Calibration again, I checked the above output
numbers, and they stay the same. It seems as if I am losing about 20% of my
output power for any setting above 10w, except on 10m, where at 100w I seem
to be losing about 50w. It also seems as if maybe there is an issue with
the internal 100w PA, based strictly on my observations and a wild guess.
If there are any other suggestions/recommendations, I'm all ears. If not,
the next step is an email to the good folks in Aptos.

Thanks and 73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624 North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468

On Mon, Feb 22, 2016 at 5:40 PM, Don Wilhelm <[hidden email]> wrote:

> Ian,
>
> Try TX Gain Calibration again - use a different coax jumper between the K3
> and dummy load - that could possibly be faulty. If that does not correct
> it, contact Elecraft support.
>
> 73,
> Don W3FPR
>
>
> On 2/22/2016 5:29 PM, Ian Kahn wrote:
>
> Don,
>
> I upgraded the MCU and ran the TX Gain Calibration at that time,
> successfully. I also ran it again Friday night, while testing, to make sure
> that wasn't the issue. It ran successfully both times.
>
> Thanks.
>
> Ian, KM4IK
> On Feb 22, 2016 5:24 PM, "Don Wilhelm" <[hidden email]> wrote:
>
>> Ian,
>>
>> Did you upgrade after MCU version from 5.13 or below to 5.14 or greater?
>> That requires you to do the TX Gain Calibration (see 5.14 Release
>> Notes). K3 Utility makes the task easy - just connect a dummy load that is
>> good for 1.8 to 54 MHz and capable of 50 watts or greater and the process
>> is automatic - follow the prompts in K3 Utility, it will take only about 2
>> minutes to complete after the dummy load is in place.
>>
>> If K3 Utility fails the TX Gain, there is one more chance - do each band
>> manually (see the Calibration part of the manual).
>>
>> If that does not correct it, contact support.
>>
>> 73,
>> Don W3FPR
>>
>>
>> On 2/22/2016 11:21 AM, Ian Kahn wrote:
>>
>>> Reposting, since this didn't seem to get out when I originally sent it
>>> last
>>> Friday evening. If you get this a second time, please forgive the noise.
>>>
>>> Thanks and 73,
>>>
>>> --Ian
>>> Ian Kahn, KM4IK
>>> Roswell, GA EM74ua
>>> [hidden email]
>>> 10-10 #74624 North Georgia Chapter #2038
>>> PODXS 070 #1962
>>> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>>>
>>> ---------- Forwarded message ----------
>>> From: Ian Kahn <[hidden email]>
>>> Date: Fri, Feb 19, 2016 at 10:37 PM
>>> Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
>>> To: "[hidden email]" <[hidden email]>
>>>
>>>
>>> All,
>>>
>>> I have what I think is an output issue with my K3 s/n 281. When set at
>>> 100W
>>> output, I am getting the following approximate output values:
>>>
>>> 10m ~55w
>>> 12m ~40w
>>> 15m ~50w
>>> 17m ~60w
>>> 20m ~60w
>>> 40m ~70w
>>> 80m ~70w
>>> 160m ~70w
>>>
>>>
>>>
>>
>

Nr4c

Re: K3 #281 Perceived Output Issue

In all the text you never mention the voltage at the radio DC input under the TX load.

What did you use to calibrate the "known good" mfj meter?

I'm surprised the TX CAL completed with this result.

Sent from my iPhone
...nr4c. bill

> On Feb 23, 2016, at 10:25 PM, Ian Kahn <[hidden email]> wrote:
>
> Several people offered some very good suggestions and asked several valid
> questions about my testing. Here are answers to many of those questions:
>
> 1. The meter I'm using in the test is a known-good MFJ-815B HF power/SWR
> meter.
> 2. I'm using a known-good 300W dummy load for my "antenna", so any
> reflected power is minimal, as is SWR.
> 3. I do have the internal ATU installed, but it is in BYPASS, as I have a
> resonant antenna on 20m-10m and use the KAT500 for 40m/80m, or when I run
> power.
> 4. Test results at lower power levels:
>
> 10m 10w out - 10w on meter; 25w out - 19-20w on meter; 50w out - ~30w on
> meter
> 12m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 30w on meter
> 15m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 35w on meter
> 17m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 35w on meter
> 20m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
> 40m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
> 80m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
>
> I also ran the TX Gain Calibration from the K3 utility one more time, with
> a different cable. Here are the results of that calibration (note - I
> didn't run the milliwatt calibration because I don't use a transverter with
> the IF Out. It just goes to my P3):
>
> K3 Tx Gain Calibration data written on 2016-02-23 at 22:18:30
> K3 Serial Number 00281
> K3 MCU revision 05.38. RS-232 speed 38400 bit/s.
> Elecraft K3 Utility Revision 1.15.8.18
> 1900 kHz TxGain LP 52
> 3750 kHz TxGain LP 30
> 5336 kHz TxGain LP 56
> 7150 kHz TxGain LP 46
> 10125 kHz TxGain LP 52
> 14200 kHz TxGain LP 23
> 18110 kHz TxGain LP 24
> 21200 kHz TxGain LP 19
> 24930 kHz TxGain LP 25
> 29000 kHz TxGain LP 30
> Several people offered some very good suggestions and asked several valid
> questions about my testing. Here are answers to many of those questions:
>
> 1. The meter I'm using in the test is a known-good MFJ-815B HF power/SWR
> meter.
> 2. I'm using a known-good 300W dummy load for my "antenna", so any
> reflected power is minimal, as is SWR.
> 3. I do have the internal ATU installed, but it is in BYPASS, as I have a
> resonant antenna on 20m-10m and use the KAT500 for 40m/80m, or when I run
> power.
> 4. Test results at lower power levels:
>
> 10m 10w out - 10w on meter; 25w out - 19-20w on meter; 50w out - ~30w on
> meter
> 12m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 30w on meter
> 15m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 35w on meter
> 17m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 35w on meter
> 20m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
> 40m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
> 80m 10w out - 10w on meter; 25w out - 20w on meter; 50w out - 40w on meter
>
> I also ran the TX Gain Calibration from the K3 utility one more time, with
> a different cable. Here are the results of that calibration (note - I
> didn't run the milliwatt calibration because I don't use a transverter with
> the IF Out. It just goes to my P3):
>
> K3 Tx Gain Calibration data written on 2016-02-23 at 22:18:30
> K3 Serial Number 00281
> K3 MCU revision 05.38. RS-232 speed 38400 bit/s.
> Elecraft K3 Utility Revision 1.15.8.18
> 1900 kHz TxGain LP 52
> 3750 kHz TxGain LP 30
> 5336 kHz TxGain LP 56
> 7150 kHz TxGain LP 46
> 10125 kHz TxGain LP 52
> 14200 kHz TxGain LP 23
> 18110 kHz TxGain LP 24
> 21200 kHz TxGain LP 19
> 24930 kHz TxGain LP 25
> 29000 kHz TxGain LP 30
> 52000 kHz TxGain LP 24
> 1900 kHz TxGain HP 46
> 3750 kHz TxGain HP 48
> 5336 kHz TxGain HP 87
> 7150 kHz TxGain HP 62
> 10125 kHz TxGain HP 58
> 14200 kHz TxGain HP 28
> 18110 kHz TxGain HP 21
> 21200 kHz TxGain HP 18
> 24930 kHz TxGain HP 18
> 29000 kHz TxGain HP 27
> 52000 kHz TxGain HP 13
>
> After running the TX Gain Calibration again, I checked the above output
> numbers, and they stay the same. It seems as if I am losing about 20% of my
> output power for any setting above 10w, except on 10m, where at 100w I seem
> to be losing about 50w. It also seems as if maybe there is an issue with
> the internal 100w PA, based strictly on my observations and a wild guess.
> If there are any other suggestions/recommendations, I'm all ears. If not,
> the next step is an email to the good folks in Aptos.
>
> Thanks and 73,
>
> --Ian
> Ian Kahn, KM4IK
> Roswell, GA EM74ua
> [hidden email]
> 10-10 #74624 North Georgia Chapter #2038
> PODXS 070 #1962
> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>
>> On Mon, Feb 22, 2016 at 5:40 PM, Don Wilhelm <[hidden email]> wrote:
>>
>> Ian,
>>
>> Try TX Gain Calibration again - use a different coax jumper between the K3
>> and dummy load - that could possibly be faulty. If that does not correct
>> it, contact Elecraft support.
>>
>> 73,
>> Don W3FPR
>>
>>
>> On 2/22/2016 5:29 PM, Ian Kahn wrote:
>>
>> Don,
>>
>> I upgraded the MCU and ran the TX Gain Calibration at that time,
>> successfully. I also ran it again Friday night, while testing, to make sure
>> that wasn't the issue. It ran successfully both times.
>>
>> Thanks.
>>
>> Ian, KM4IK
>>> On Feb 22, 2016 5:24 PM, "Don Wilhelm" <[hidden email]> wrote:
>>>
>>> Ian,
>>>
>>> Did you upgrade after MCU version from 5.13 or below to 5.14 or greater?
>>> That requires you to do the TX Gain Calibration (see 5.14 Release
>>> Notes). K3 Utility makes the task easy - just connect a dummy load that is
>>> good for 1.8 to 54 MHz and capable of 50 watts or greater and the process
>>> is automatic - follow the prompts in K3 Utility, it will take only about 2
>>> minutes to complete after the dummy load is in place.
>>>
>>> If K3 Utility fails the TX Gain, there is one more chance - do each band
>>> manually (see the Calibration part of the manual).
>>>
>>> If that does not correct it, contact support.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>>
>>>> On 2/22/2016 11:21 AM, Ian Kahn wrote:
>>>>
>>>> Reposting, since this didn't seem to get out when I originally sent it
>>>> last
>>>> Friday evening. If you get this a second time, please forgive the noise.
>>>>
>>>> Thanks and 73,
>>>>
>>>> --Ian
>>>> Ian Kahn, KM4IK
>>>> Roswell, GA EM74ua
>>>> [hidden email]
>>>> 10-10 #74624 North Georgia Chapter #2038
>>>> PODXS 070 #1962
>>>> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>>>>
>>>> ---------- Forwarded message ----------
>>>> From: Ian Kahn <[hidden email]>
>>>> Date: Fri, Feb 19, 2016 at 10:37 PM
>>>> Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
>>>> To: "[hidden email]" <[hidden email]>
>>>>
>>>>
>>>> All,
>>>>
>>>> I have what I think is an output issue with my K3 s/n 281. When set at
>>>> 100W
>>>> output, I am getting the following approximate output values:
>>>>
>>>> 10m ~55w
>>>> 12m ~40w
>>>> 15m ~50w
>>>> 17m ~60w
>>>> 20m ~60w
>>>> 40m ~70w
>>>> 80m ~70w
>>>> 160m ~70w
> ______________________________________________________________
> 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]

Ian Kahn, KM4IK

Re: K3 #281 Perceived Output Issue

In reply to this post by Ian Kahn, KM4IK

Jerry,

Thanks for the response. I'm curious, however, why removing the 100W PA and
running calibration tests at 10W would matter, if I'm already seeing
expected results at the 10W power level. That is, I set the output power on
my K3 to 10W, and transmit using a full duty cycle mode. On the external
power meter, I see 10W, on all bands. This would seem to me to indicate that
there isn't an issue with the low power amplifier.

Thank you.

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624, North Georgia Chapter #2038
PODXS 070 #1962
K3# 281, P3 #688, KAT500 #860, KPA500 #1468

-----Original Message-----
From: Jerry [mailto:[hidden email]]
Sent: Tuesday, February 23, 2016 10:53 PM
To: Ian Kahn <[hidden email]>
Cc: [hidden email]; [hidden email]
Subject: Re: [Elecraft] K3 #281 Perceived Output Issue

Remove hundred watt PA. Install a 10 W jumper. Run through the 10 W
calibration. Measure record and share the results.

It is logical to expect that this is where the issue is starting.

Sent from my iPad

> On Feb 23, 2016, at 10:25 PM, Ian Kahn <[hidden email]> wrote:
>
> Several people offered some very good suggestions and asked several
> valid questions about my testing. Here are answers to many of those
questions:

>
> 1. The meter I'm using in the test is a known-good MFJ-815B HF
> power/SWR meter.
> 2. I'm using a known-good 300W dummy load for my "antenna", so any
> reflected power is minimal, as is SWR.
> 3. I do have the internal ATU installed, but it is in BYPASS, as I
> have a resonant antenna on 20m-10m and use the KAT500 for 40m/80m, or
> when I run power.
> 4. Test results at lower power levels:
>
> 10m 10w out - 10w on meter; 25w out - 19-20w on meter; 50w out - ~30w
> on meter 12m 10w out - 10w on meter; 25w out - 20w on meter; 50w out -
> 30w on meter 15m 10w out - 10w on meter; 25w out - 20w on meter; 50w
> out - 35w on meter 17m 10w out - 10w on meter; 25w out - 20w on meter;
> 50w out - 35w on meter 20m 10w out - 10w on meter; 25w out - 20w on
> meter; 50w out - 40w on meter 40m 10w out - 10w on meter; 25w out -
> 20w on meter; 50w out - 40w on meter 80m 10w out - 10w on meter; 25w
> out - 20w on meter; 50w out - 40w on meter
>
> I also ran the TX Gain Calibration from the K3 utility one more time,
> with a different cable. Here are the results of that calibration (note
> - I didn't run the milliwatt calibration because I don't use a
> transverter with the IF Out. It just goes to my P3):
>
> K3 Tx Gain Calibration data written on 2016-02-23 at 22:18:30
> K3 Serial Number 00281
> K3 MCU revision 05.38. RS-232 speed 38400 bit/s.
> Elecraft K3 Utility Revision 1.15.8.18
> 1900 kHz TxGain LP 52
> 3750 kHz TxGain LP 30
> 5336 kHz TxGain LP 56
> 7150 kHz TxGain LP 46
> 10125 kHz TxGain LP 52
> 14200 kHz TxGain LP 23
> 18110 kHz TxGain LP 24
> 21200 kHz TxGain LP 19
> 24930 kHz TxGain LP 25
> 29000 kHz TxGain LP 30
> 52000 kHz TxGain LP 24
> 1900 kHz TxGain HP 46
> 3750 kHz TxGain HP 48
> 5336 kHz TxGain HP 87
> 7150 kHz TxGain HP 62
> 10125 kHz TxGain HP 58
> 14200 kHz TxGain HP 28
> 18110 kHz TxGain HP 21
> 21200 kHz TxGain HP 18
> 24930 kHz TxGain HP 18
> 29000 kHz TxGain HP 27
> 52000 kHz TxGain HP 13
>
> After running the TX Gain Calibration again, I checked the above
> output numbers, and they stay the same. It seems as if I am losing
> about 20% of my output power for any setting above 10w, except on 10m,
> where at 100w I seem to be losing about 50w. It also seems as if maybe
> there is an issue with the internal 100w PA, based strictly on my

observations and a wild guess.

> If there are any other suggestions/recommendations, I'm all ears. If
> not, the next step is an email to the good folks in Aptos.
>
> Thanks and 73,
>
> --Ian
> Ian Kahn, KM4IK
> Roswell, GA EM74ua
> [hidden email]
> 10-10 #74624 North Georgia Chapter #2038 PODXS 070 #1962
> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>
>> On Mon, Feb 22, 2016 at 5:40 PM, Don Wilhelm <[hidden email]>

wrote:

>>
>> Ian,
>>
>> Try TX Gain Calibration again - use a different coax jumper between
>> the K3 and dummy load - that could possibly be faulty. If that does
>> not correct it, contact Elecraft support.
>>
>> 73,
>> Don W3FPR
>>
>>
>> On 2/22/2016 5:29 PM, Ian Kahn wrote:
>>
>> Don,
>>
>> I upgraded the MCU and ran the TX Gain Calibration at that time,
>> successfully. I also ran it again Friday night, while testing, to
>> make sure that wasn't the issue. It ran successfully both times.
>>
>> Thanks.
>>
>> Ian, KM4IK
>>> On Feb 22, 2016 5:24 PM, "Don Wilhelm" <[hidden email]> wrote:
>>>
>>> Ian,
>>>
>>> Did you upgrade after MCU version from 5.13 or below to 5.14 or greater?
>>> That requires you to do the TX Gain Calibration (see 5.14 Release
>>> Notes). K3 Utility makes the task easy - just connect a dummy load
>>> that is good for 1.8 to 54 MHz and capable of 50 watts or greater
>>> and the process is automatic - follow the prompts in K3 Utility, it
>>> will take only about 2 minutes to complete after the dummy load is in

place.

>>>
>>> If K3 Utility fails the TX Gain, there is one more chance - do each
>>> band manually (see the Calibration part of the manual).
>>>
>>> If that does not correct it, contact support.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>>
>>>> On 2/22/2016 11:21 AM, Ian Kahn wrote:
>>>>
>>>> Reposting, since this didn't seem to get out when I originally sent
>>>> it last Friday evening. If you get this a second time, please
>>>> forgive the noise.
>>>>
>>>> Thanks and 73,
>>>>
>>>> --Ian
>>>> Ian Kahn, KM4IK
>>>> Roswell, GA EM74ua
>>>> [hidden email]
>>>> 10-10 #74624 North Georgia Chapter #2038 PODXS 070 #1962
>>>> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>>>>
>>>> ---------- Forwarded message ----------
>>>> From: Ian Kahn <[hidden email]>
>>>> Date: Fri, Feb 19, 2016 at 10:37 PM
>>>> Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
>>>> To: "[hidden email]" <[hidden email]>
>>>>
>>>>
>>>> All,
>>>>
>>>> I have what I think is an output issue with my K3 s/n 281. When set
>>>> at 100W output, I am getting the following approximate output
>>>> values:
>>>>
>>>> 10m ~55w
>>>> 12m ~40w
>>>> 15m ~50w
>>>> 17m ~60w
>>>> 20m ~60w
>>>> 40m ~70w
>>>> 80m ~70w
>>>> 160m ~70w
> ______________________________________________________________
> 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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______________________________________________________________
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]

Joe Subich, W4TV-4

Re: K3 #281 Perceived Output Issue

Ian,

Either the LPA or the KPA is compressing above 5/50W.

Set the K3 to 5.5 watts and check power output on each band. Then set
the K3 to 10 watts and check power output on each band. Then repeat
the process at 55 and 100 watts.

That should tell you if the LPA or KPA is compressing and will allow
Elecraft Support (when you e-mail or call them) to focus on the source
of your problem. If you have 5.5 and 10 watts (or close) at the low
power test the LPA is OK and the KPA is going into compression for
some reason (check power supply and the +13V pins on the headers).
If you do not have 5.5/10W on the LPA test, your LPA is going into
compression and it may need to be swapped or connections checked.

73,

... Joe, W4TV

On 2/24/2016 7:40 AM, Ian - Ham wrote:

> Jerry,
>
> Thanks for the response. I'm curious, however, why removing the 100W PA and
> running calibration tests at 10W would matter, if I'm already seeing
> expected results at the 10W power level. That is, I set the output power on
> my K3 to 10W, and transmit using a full duty cycle mode. On the external
> power meter, I see 10W, on all bands. This would seem to me to indicate that
> there isn't an issue with the low power amplifier.
>
> Thank you.
>
> --Ian
> Ian Kahn, KM4IK
> Roswell, GA EM74ua
> [hidden email]
> 10-10 #74624, North Georgia Chapter #2038
> PODXS 070 #1962
> K3# 281, P3 #688, KAT500 #860, KPA500 #1468
>
> -----Original Message-----
> From: Jerry [mailto:[hidden email]]
> Sent: Tuesday, February 23, 2016 10:53 PM
> To: Ian Kahn <[hidden email]>
> Cc: [hidden email]; [hidden email]
> Subject: Re: [Elecraft] K3 #281 Perceived Output Issue
>
> Remove hundred watt PA. Install a 10 W jumper. Run through the 10 W
> calibration. Measure record and share the results.
>
> It is logical to expect that this is where the issue is starting.
>
> Sent from my iPad
>
>> On Feb 23, 2016, at 10:25 PM, Ian Kahn <[hidden email]> wrote:
>>
>> Several people offered some very good suggestions and asked several
>> valid questions about my testing. Here are answers to many of those
> questions:
>>
>> 1. The meter I'm using in the test is a known-good MFJ-815B HF
>> power/SWR meter.
>> 2. I'm using a known-good 300W dummy load for my "antenna", so any
>> reflected power is minimal, as is SWR.
>> 3. I do have the internal ATU installed, but it is in BYPASS, as I
>> have a resonant antenna on 20m-10m and use the KAT500 for 40m/80m, or
>> when I run power.
>> 4. Test results at lower power levels:
>>
>> 10m 10w out - 10w on meter; 25w out - 19-20w on meter; 50w out - ~30w
>> on meter 12m 10w out - 10w on meter; 25w out - 20w on meter; 50w out -
>> 30w on meter 15m 10w out - 10w on meter; 25w out - 20w on meter; 50w
>> out - 35w on meter 17m 10w out - 10w on meter; 25w out - 20w on meter;
>> 50w out - 35w on meter 20m 10w out - 10w on meter; 25w out - 20w on
>> meter; 50w out - 40w on meter 40m 10w out - 10w on meter; 25w out -
>> 20w on meter; 50w out - 40w on meter 80m 10w out - 10w on meter; 25w
>> out - 20w on meter; 50w out - 40w on meter
>>
>> I also ran the TX Gain Calibration from the K3 utility one more time,
>> with a different cable. Here are the results of that calibration (note
>> - I didn't run the milliwatt calibration because I don't use a
>> transverter with the IF Out. It just goes to my P3):
>>
>> K3 Tx Gain Calibration data written on 2016-02-23 at 22:18:30
>> K3 Serial Number 00281
>> K3 MCU revision 05.38. RS-232 speed 38400 bit/s.
>> Elecraft K3 Utility Revision 1.15.8.18
>> 1900 kHz TxGain LP 52
>> 3750 kHz TxGain LP 30
>> 5336 kHz TxGain LP 56
>> 7150 kHz TxGain LP 46
>> 10125 kHz TxGain LP 52
>> 14200 kHz TxGain LP 23
>> 18110 kHz TxGain LP 24
>> 21200 kHz TxGain LP 19
>> 24930 kHz TxGain LP 25
>> 29000 kHz TxGain LP 30
>> 52000 kHz TxGain LP 24
>> 1900 kHz TxGain HP 46
>> 3750 kHz TxGain HP 48
>> 5336 kHz TxGain HP 87
>> 7150 kHz TxGain HP 62
>> 10125 kHz TxGain HP 58
>> 14200 kHz TxGain HP 28
>> 18110 kHz TxGain HP 21
>> 21200 kHz TxGain HP 18
>> 24930 kHz TxGain HP 18
>> 29000 kHz TxGain HP 27
>> 52000 kHz TxGain HP 13
>>
>> After running the TX Gain Calibration again, I checked the above
>> output numbers, and they stay the same. It seems as if I am losing
>> about 20% of my output power for any setting above 10w, except on 10m,
>> where at 100w I seem to be losing about 50w. It also seems as if maybe
>> there is an issue with the internal 100w PA, based strictly on my
> observations and a wild guess.
>> If there are any other suggestions/recommendations, I'm all ears. If
>> not, the next step is an email to the good folks in Aptos.
>>
>> Thanks and 73,
>>
>> --Ian
>> Ian Kahn, KM4IK
>> Roswell, GA EM74ua
>> [hidden email]
>> 10-10 #74624 North Georgia Chapter #2038 PODXS 070 #1962
>> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>>
>>> On Mon, Feb 22, 2016 at 5:40 PM, Don Wilhelm <[hidden email]>
> wrote:
>>>
>>> Ian,
>>>
>>> Try TX Gain Calibration again - use a different coax jumper between
>>> the K3 and dummy load - that could possibly be faulty. If that does
>>> not correct it, contact Elecraft support.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>>
>>> On 2/22/2016 5:29 PM, Ian Kahn wrote:
>>>
>>> Don,
>>>
>>> I upgraded the MCU and ran the TX Gain Calibration at that time,
>>> successfully. I also ran it again Friday night, while testing, to
>>> make sure that wasn't the issue. It ran successfully both times.
>>>
>>> Thanks.
>>>
>>> Ian, KM4IK
>>>> On Feb 22, 2016 5:24 PM, "Don Wilhelm" <[hidden email]> wrote:
>>>>
>>>> Ian,
>>>>
>>>> Did you upgrade after MCU version from 5.13 or below to 5.14 or greater?
>>>> That requires you to do the TX Gain Calibration (see 5.14 Release
>>>> Notes). K3 Utility makes the task easy - just connect a dummy load
>>>> that is good for 1.8 to 54 MHz and capable of 50 watts or greater
>>>> and the process is automatic - follow the prompts in K3 Utility, it
>>>> will take only about 2 minutes to complete after the dummy load is in
> place.
>>>>
>>>> If K3 Utility fails the TX Gain, there is one more chance - do each
>>>> band manually (see the Calibration part of the manual).
>>>>
>>>> If that does not correct it, contact support.
>>>>
>>>> 73,
>>>> Don W3FPR
>>>>
>>>>
>>>>> On 2/22/2016 11:21 AM, Ian Kahn wrote:
>>>>>
>>>>> Reposting, since this didn't seem to get out when I originally sent
>>>>> it last Friday evening. If you get this a second time, please
>>>>> forgive the noise.
>>>>>
>>>>> Thanks and 73,
>>>>>
>>>>> --Ian
>>>>> Ian Kahn, KM4IK
>>>>> Roswell, GA EM74ua
>>>>> [hidden email]
>>>>> 10-10 #74624 North Georgia Chapter #2038 PODXS 070 #1962
>>>>> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>>>>>
>>>>> ---------- Forwarded message ----------
>>>>> From: Ian Kahn <[hidden email]>
>>>>> Date: Fri, Feb 19, 2016 at 10:37 PM
>>>>> Subject: [Elecraft][K3] K3 #281 Perceived Output Issue
>>>>> To: "[hidden email]" <[hidden email]>
>>>>>
>>>>>
>>>>> All,
>>>>>
>>>>> I have what I think is an output issue with my K3 s/n 281. When set
>>>>> at 100W output, I am getting the following approximate output
>>>>> values:
>>>>>
>>>>> 10m ~55w
>>>>> 12m ~40w
>>>>> 15m ~50w
>>>>> 17m ~60w
>>>>> 20m ~60w
>>>>> 40m ~70w
>>>>> 80m ~70w
>>>>> 160m ~70w
>> ______________________________________________________________
>> 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]
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
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> ______________________________________________________________
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> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Message delivered to [hidden email]
>

Jerry Moore

Re: K3 #281 Perceived Output Issue

In reply to this post by Ian Kahn, KM4IK

Because there's a specific calibration process during build that's performed
on the 10w system prior to installing the 100w amp.

With the 100w amp in place and the jumpers configured the data is
speculative as to which circuits are in operation.

The key to troubleshooting is to isolate. Don't assume data. Measure. You
stated that your wattmeter is "known good", how/how recently did you get the
calibration checked? Verify switch settings for the ranges?
I usually trip on the simple things that, if known, would make me appear
simple minded...but we won't discuss my past lumberings... :)

Since the PA is trivial to remove is there any good reason to not do so?

Logical assumptions based on the data so far:
1. The 100w amp is working by netting greater than 10w
2. We don't know the status of the 10w amp but since it drives the 100w amp
we're getting something out of it.
3. We don't know how much power the 10w amp is outputting at full drive.
4. The rig was most likely OP assembled or an add on installed --- you may
clarify the case here.
5. Wiring is suspect - Personally I had challenges here when installing the
ATU and some other things.

When an assembled system is new, always suspect connections/configuration.

Jerry Moore
CDXA, INDEXA, SKCC, Fists
AE4PB, K3S - S.N. 010324
http://www.qrz.com/db/AE4PB
An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and
Patriotic.

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Joe Subich, W4TV-4

Re: K3 #281 Perceived Output Issue

> With the 100w amp in place and the jumpers configured the data is
> speculative as to which circuits are in operation.

It is not necessary to remove the 100W amp. Simply dial the power
back below 12W and it will be bypassed. Thus my procedure to check
power at 5.5/10 and 55/100 W ... using 5.5 and 55 avoids triggering
the power calibration routines which occur at 5.0 and 50 W.

Since the output is compressing at 60 to 80 Watts, the compression
point will be readily visible with the 5.5/10 and 55/100 tests.

73,

... Joe, W4TV

On 2/24/2016 8:34 AM, Jerry Moore wrote:

> Because there's a specific calibration process during build that's performed
> on the 10w system prior to installing the 100w amp.
>
> With the 100w amp in place and the jumpers configured the data is
> speculative as to which circuits are in operation.
>
> The key to troubleshooting is to isolate. Don't assume data. Measure. You
> stated that your wattmeter is "known good", how/how recently did you get the
> calibration checked? Verify switch settings for the ranges?
> I usually trip on the simple things that, if known, would make me appear
> simple minded...but we won't discuss my past lumberings... :)
>
> Since the PA is trivial to remove is there any good reason to not do so?
>
> Logical assumptions based on the data so far:
> 1. The 100w amp is working by netting greater than 10w
> 2. We don't know the status of the 10w amp but since it drives the 100w amp
> we're getting something out of it.
> 3. We don't know how much power the 10w amp is outputting at full drive.
> 4. The rig was most likely OP assembled or an add on installed --- you may
> clarify the case here.
> 5. Wiring is suspect - Personally I had challenges here when installing the
> ATU and some other things.
>
> When an assembled system is new, always suspect connections/configuration.
>
>
> Jerry Moore
> CDXA, INDEXA, SKCC, Fists
> AE4PB, K3S - S.N. 010324
> http://www.qrz.com/db/AE4PB
> An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and
> Patriotic.
>
>
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