Re: [Elecraft] 80 meters

[Barthold Lichtenbelt via Elecraft]

Hi Mal, 

There was a bunch of advice so far on the list, did any of that help you?

73,
Barthold
AD0RM

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mal Speer
Sent: Saturday, December 30, 2017 7:52 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 80 meters

I seem to have low output on 75 phone. The most power I can put out is 71
watts. I can turn the power knob to 100 watts, but it backs down to 71
immediately. This is into an antenna and a dummy load.

I just checked 160 same thing except I get 83 watts

All other bands seem OK

Mal WA2TWA

 

 

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Re: [Elecraft] 80 meters

[Wes Stewart]

IMD is also frequency sensitive.

Wes  N7WS'


On 12/31/2017 12:17 PM, Jim Brown wrote:
 It's important to realize that IMD in many rigs, including the K3, increases 
with power output AND with reduced power supply voltage


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Re: [Elecraft] 80 meters

[Barthold Lichtenbelt via Elecraft]

➢ and 3- reran the K3 Power Cal procedure with the K3 Utility.

Yes, great advice. Definitely do this.

73,
Barthold


From: Brian Hunt
Sent: Saturday, December 30, 2017 9:49 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 meters

I had a similar problem on the low bands. I did three things:  1- Replaced the 
stock power cord with ~4 ft of #10 twisted pair cable; 2- Turned up the no-load 
voltage on the Actron linear supply to 14.2 v which gives me better than 13.5v 
@ 100w key down on the K3 display and 3- reran the K3 Power Cal procedure with 
the K3 Utility. It's been fine ever since.  GL+HNY

73,
Brian, K0DTJ

> On Dec 30, 2017, at 18:51, Mal Speer <ma...@carolina.rr.com> wrote:
> 
> I seem to have low output on 75 phone. The most power I can put out is 71
> watts. I can turn the power knob to 100 watts, but it backs down to 71
> immediately. This is into an antenna and a dummy load.
> 

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Re: [Elecraft] 80 meters

[Jim Brown]

On 12/31/2017 10:42 AM, Bob McGraw K4TAX wrote:
Yes, I've done that.  However, since the radio draws a different 
amount of current at 100 watts CW into a 50 ohm dummy load depending 
on band, the IR drop in the DC  line will be slightly different from 
band to band. 


Most rigs that run on DC are designed to be run at 13.8V. It's important 
to realize that IMD in many rigs, including the K3, increases with power 
output AND with reduced power supply voltage. K6XX is an EE at Elecraft 
who works in manufacturing -- that is, taking designs from the team, 
putting them into production, and preliminary testing for the FCC 
approval process. Bob, a serious contester, is my neighbor, and we are 
both members of the Northern California Contest Club (as is Eric Swartz).


Several years ago, Bob put together a technical talk for NCCC on IMD, to 
which I contributed some on-air measurements and observations on the 
contributions of audio to distortion and splatter. Bob's slides include 
lab measurements documenting the increased IMD resulting from operating 
at reduced power supply voltage and closer to rated output. BTW -- early 
K3 firmware permitted operation to 120W; that was reduced to 110W 
because IMD at the higher power level was judged excessive. The slides 
for that talk are at


http://k9yc.com/K6XXAmpTalk.pdf

I've since done my own measurements showing that CW bandwidth is 
considerably lower at the 30-60W levels needed to drive most power amps 
than at 100W. That data is at


http://k9yc.com/P3_Spectrum_Measurements.pdf

In my own shack, a pair of K3s (for SO2R) runs from a 100Ah 
float-charged LiFePO battery, so terminal voltage stays in the range of 
13-13.6V keydown. About two years ago, I switched to the LiFePO battery 
from a big lead acid battery, because terminal voltage under load was in 
the range of 12.3 - 11.8V.


73, Jim K9YC

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Re: [Elecraft] 80 meters

[Bob McGraw K4TAX]

Yes, I've done that.  However, since the radio draws a different amount 
of current at 100 watts CW into a 50 ohm dummy load depending on band, 
the IR drop in the DC  line will be slightly different from band to band.



73

Bob, K4TAX



On 12/31/2017 10:18 AM, donov...@starpower.net wrote:

Hi Bob,

Rather than estimating  the loss in your power cord, your K3 has the
capability to accurately measure and display the DC power voltage
internal to your transceiver.

Tap DISPLAY and rotate the VFO B dial to show the K3 power
supply voltage when you're transmitting.

73
Frank
W3LPL


*From: *"Bob McGraw K4TAX" <rmcg...@blomand.net>
*To: *elecraft@mailman.qth.net
*Sent: *Sunday, December 31, 2017 2:27:01 PM
*Subject: *Re: [Elecraft] 80 meters

I run my power supply at 14.0 volts as measured at the supply. This is
done to accommodate the ~0.25 - ~0.35 volt drop in the DC line between
the supply and the radio when in transmit.

73

Bob, K4TAX


On 12/30/2017 10:20 PM, Barthold Lichtenbelt via Elecraft wrote:
> Make sure your power supply provides enough voltage and can handle 
the power draw (300 watts is probably a good number). This happened to 
me too when I accidentally adjusted the voltage of my PSU too low. I 
now have it at 13.6V.

>
> Sent from Mail for Windows 10
>
> From: Mal Speer
> Sent: Saturday, December 30, 2017 8:01 PM
> To: 'Mal Speer'; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] 80 meters
>
> I forgot to say that the rig is a factory built K3s
> Mal
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mal Speer
> Sent: Saturday, December 30, 2017 9:52 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] 80 meters
>
> I seem to have low output on 75 phone. The most power I can put out 
is 71

> watts. I can turn the power knob to 100 watts, but it backs down to 71
> immediately. This is into an antenna and a dummy load.
>
> I just checked 160 same thing except I get 83 watts
>
> All other bands seem OK
>
> Mal WA2TWA
>
>
>
>
>
> __
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Message

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[Elecraft] 80 meters

[john]

I am not sure which transceiver you have, but on my K3S I had to use much
larger cables than the factory supplied to obtain 13.5v min when
transmitting. What voltage do you have when transmitting?

John KK9A


Sat Dec 30 21:51:50 EST 2017
Previous message: [Elecraft] KX2 CW tx decode for code practicing using
external straight key
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Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
I seem to have low output on 75 phone. The most power I can put out is 71
watts. I can turn the power knob to 100 watts, but it backs down to 71
immediately. This is into an antenna and a dummy load.

I just checked 160 same thing except I get 83 watts

All other bands seem OK

Mal WA2TWA

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Re: [Elecraft] 80 meters

[donovanf]

Hi Bob, 


Rather than estimating the loss in your power cord, your K3 has the 
capability to accurately measure and display the DC power voltage 
internal to your transceiver. 


Tap DISPLAY and rotate the VFO B dial to show the K3 power 
supply voltage when you're transmitting. 


73 
Frank 
W3LPL 

- Original Message -

From: "Bob McGraw K4TAX" <rmcg...@blomand.net> 
To: elecraft@mailman.qth.net 
Sent: Sunday, December 31, 2017 2:27:01 PM 
Subject: Re: [Elecraft] 80 meters 

I run my power supply at 14.0 volts as measured at the supply. This is 
done to accommodate the ~0.25 - ~0.35 volt drop in the DC line between 
the supply and the radio when in transmit. 

73 

Bob, K4TAX 


On 12/30/2017 10:20 PM, Barthold Lichtenbelt via Elecraft wrote: 
> Make sure your power supply provides enough voltage and can handle the power 
> draw (300 watts is probably a good number). This happened to me too when I 
> accidentally adjusted the voltage of my PSU too low. I now have it at 13.6V. 
> 
> Sent from Mail for Windows 10 
> 
> From: Mal Speer 
> Sent: Saturday, December 30, 2017 8:01 PM 
> To: 'Mal Speer'; elecraft@mailman.qth.net 
> Subject: Re: [Elecraft] 80 meters 
> 
> I forgot to say that the rig is a factory built K3s 
> Mal 
> 
> -Original Message- 
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mal Speer 
> Sent: Saturday, December 30, 2017 9:52 PM 
> To: elecraft@mailman.qth.net 
> Subject: [Elecraft] 80 meters 
> 
> I seem to have low output on 75 phone. The most power I can put out is 71 
> watts. I can turn the power knob to 100 watts, but it backs down to 71 
> immediately. This is into an antenna and a dummy load. 
> 
> I just checked 160 same thing except I get 83 watts 
> 
> All other bands seem OK 
> 
> Mal WA2TWA 
> 
> 
> 
> 
> 
> __ 
> Elecraft mailing list 
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Re: [Elecraft] 80 meters

[Bob McGraw K4TAX]

I run my power supply at 14.0 volts as measured at the supply. This is 
done to accommodate the ~0.25 - ~0.35 volt drop in the DC line between 
the supply and the radio when in transmit.


73

Bob, K4TAX


On 12/30/2017 10:20 PM, Barthold Lichtenbelt via Elecraft wrote:

Make sure your power supply provides enough voltage and can handle the power 
draw (300 watts is probably a good number). This happened to me too when I 
accidentally adjusted the voltage of my PSU too low. I now have it at 13.6V.

Sent from Mail for Windows 10

From: Mal Speer
Sent: Saturday, December 30, 2017 8:01 PM
To: 'Mal Speer'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 meters

I forgot to say that the rig is a factory built K3s
Mal

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mal Speer
Sent: Saturday, December 30, 2017 9:52 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 80 meters

I seem to have low output on 75 phone. The most power I can put out is 71
watts. I can turn the power knob to 100 watts, but it backs down to 71
immediately. This is into an antenna and a dummy load.

I just checked 160 same thing except I get 83 watts

All other bands seem OK

Mal WA2TWA

  

  


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Re: [Elecraft] 80 meters

[Brian Hunt]

I had a similar problem on the low bands. I did three things:  1- Replaced the 
stock power cord with ~4 ft of #10 twisted pair cable; 2- Turned up the no-load 
voltage on the Actron linear supply to 14.2 v which gives me better than 13.5v 
@ 100w key down on the K3 display and 3- reran the K3 Power Cal procedure with 
the K3 Utility. It's been fine ever since.  GL+HNY

73,
Brian, K0DTJ

> On Dec 30, 2017, at 18:51, Mal Speer  wrote:
> 
> I seem to have low output on 75 phone. The most power I can put out is 71
> watts. I can turn the power knob to 100 watts, but it backs down to 71
> immediately. This is into an antenna and a dummy load.
> 

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Re: [Elecraft] 80 meters

[Barthold Lichtenbelt via Elecraft]

Make sure your power supply provides enough voltage and can handle the power 
draw (300 watts is probably a good number). This happened to me too when I 
accidentally adjusted the voltage of my PSU too low. I now have it at 13.6V.

Sent from Mail for Windows 10

From: Mal Speer
Sent: Saturday, December 30, 2017 8:01 PM
To: 'Mal Speer'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 meters

I forgot to say that the rig is a factory built K3s
Mal

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mal Speer
Sent: Saturday, December 30, 2017 9:52 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 80 meters

I seem to have low output on 75 phone. The most power I can put out is 71
watts. I can turn the power knob to 100 watts, but it backs down to 71
immediately. This is into an antenna and a dummy load.

I just checked 160 same thing except I get 83 watts

All other bands seem OK

Mal WA2TWA

 

 

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Re: [Elecraft] 80 meters

[Mal Speer]

I forgot to say that the rig is a factory built K3s
Mal

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mal Speer
Sent: Saturday, December 30, 2017 9:52 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 80 meters

I seem to have low output on 75 phone. The most power I can put out is 71
watts. I can turn the power knob to 100 watts, but it backs down to 71
immediately. This is into an antenna and a dummy load.

I just checked 160 same thing except I get 83 watts

All other bands seem OK

Mal WA2TWA

 

 

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[Elecraft] 80 meters

[Mal Speer]

I seem to have low output on 75 phone. The most power I can put out is 71
watts. I can turn the power knob to 100 watts, but it backs down to 71
immediately. This is into an antenna and a dummy load.

I just checked 160 same thing except I get 83 watts

All other bands seem OK

Mal WA2TWA

 

 

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[Elecraft] 80 meters with an R8 vertical ( K2)

[Don Ehrlich]

Pushing 80 meter RF into an R8 could be very bad for the R8.  The tuner has 
been able to find a match that allows the radio to pump RF into the coax to 
the antenna but that RF *might* be (mostly) going into the tuning network of 
the antenna instead of being radiated.  Overstress is a definite possibility 
when doing that so please be careful.

Don K7FJ

 Using my K3, with its built-in ATU, I am able to get a 1:1 match on 80
 meters using my R8 vertical, which isn't supposed to go lower than 40
 meters.  I can also get a match that is better than 2:1 on 160.  Obviously
 though, the efficiency of this antenna on those bands is pretty lousy.  I
 really don't operate on 160, except I did work VP6DX on both SSB and CW 
 with
 this arrangement.  Their beverages did all the work though I'm sure.


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[Elecraft] 80 Meters in the Park w/KX1

[W0rw]

i will be out in the park tonight (26 March) at 2100 EST using my new KX1-4 
on 80 meters, (Wow! What a mod kit !)

   i will be running a field check at on the KX1, Pedestrian Mobile, on 3560 
kHz (+/- 5 kHz) w/30 foot drag wire. i will be using a 10 foot whip (-20 dB on 
80 meters) with a 60 uH loading coil. This gives me about 100 mW ERP best 
case.
The KX1 ATU will load my whip on 20, 30 and 40 but on 80 i need the coil.
   i will switch to 7040 (+/- 5) at 2130 EST.
i appreciate your call.  
Carpe Noctem !
Paul  
w0rw/pm
(Bear Creek Park, COS, CO) 
New color w0rw/pm QSL cards available.
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