[Elecraft] Elecraft CW Net Announcement

[kevinr]

Good Evening,

   I was working on a pile of brush when I heard an odd sound. It took 
a while to remember what it was.  At first I thought someone had snuck 
their old truck nearby.  It sounded like a very rusty hinge opening.  
When it repeated I heard the breathy finish and knew it was elk.  For 
the next hour they would bugle every five minutes or so as they walked 
up from the east and then down toward the west.  They were moving 
through the most covered area of new growth.  It has been a number of 
years since there has been enough cover for them.


   The bear berries are ripe.  Grouse love them, both spruce and 
ruffed.  They flush when I am out walking through the white berries.  If 
it's windy they appear from almost underfoot which gets exciting.  The 
sun has a few speckles on it with one spot growing rapidly.  The flux 
has increased and we are due for a CME.  Hopefully the band will be 
better.  Lots of PT this week, I hope it helps keep my hand from sending 
too many odd dots and dashes when I least expect them.



Please join us tomorrow on:

14050 kHz at 2200z Sunday (3 PM PDT Sunday)
  7045 kHz at z Monday (5 PM PDT Sunday)

73,
Kevin. KD5ONS

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Re: [Elecraft] K3 TX Calib Dummy Load Recommendations

[Bob McGraw K4TAX]

While one can measure a dummy load with an ohm meter, this is only the 
DC resistance of the resistive element.   It does not assure that it is 
non-reactive as reactance is an AC component related to frequency.   
Dummy loads should appear as 50 ohms at all frequencies within the range 
where they are expected to be used.    A good dummy load will be rated 
at 50 ohms from DC to 500 MHz or higher.


A better way to verify a dummy load is to use an antenna analyzer such 
as a MFJ-259, an Autec, or Comet CAA-500 or RigExpert AA-30, etc.   Do 
connect the dummy load direct to the instrument without a jumper cable 
and sweep the range of frequencies desired.   Any value measured other 
than 50 ohms and with a SWR greater than 1.1:1 is deemed not 
satisfactory for a dummy load.   Another method is to use a return loss 
bridge or a vector network analyzer.


Don't be mislead by the numbers printed on the label.  I have two of the 
"gallon can" oil filled types.  They measure noticeably different values 
than 50 ohms and get quite reactive above 30 MHz.


From this source you will find 100 watt Decibel Product dummy loads 
DB4303B for $50 each. http://www.nm3e.com/loadSampler.htm#LoadSampler



And you will find Bird 100 watt loads, good from DC to 2.4GHz for $85.  
And if you need one for that legal limit amp, they have a Bird 82C being 
a 2500 watt water cooled load for $500.


Everyone should have a dummy load and an antenna bridge for their station.

73

Bob, K4TAX



On 8/25/2018 7:35 PM, Walter Underwood wrote:

I built the Oak Hills Research RFL-100 dummy load kit. It is supposed to be 
good to
144 MHz, so it should be fine at 50. If you’ve never built a kit, this is a 
good one to
start with. The kit is $50. I got the $5 BNC option, since my shack is 100% BNC.

http://www.ohr.com/rfl100.htm

Here are some photos of my build. Mine measured 49.9 Ω, which is within 0.2%.
My Ohmmeter is accurate to +/-0.5%, so I’ll take that as a solid 50 Ω. Because 
the
dummy load is built with 50 resistors, part tolerances will average out.

https://observer.wunderwood.org/2016/12/31/building-a-dummy-load/

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


On Aug 25, 2018, at 4:49 PM, Mark Goldberg  wrote:

A good one that you know is 50 ohms over the range of frequencies and power
you want to use it at. Unfortunately, any particular model may be good or
bad, depending on how it has been used or abused. Is there any way you can
get access to an analyzer to determine if the dummy load is good? I have a
Vector Network Analyzer, but few hams will have one of those.

Also, if you really want to do a real calibration, you should have a
calibrated reference to check against. Lots of devices can be 5-10% off if
not calibrated, worse if abused or damaged. A Bird meter is only specified
to I think 5% of the full scale. So if it is a 200W full scale, it could be
10W off. So 100W might read 110W or 90W.  I've got a calibrated Spectrum
Analyzer and Signal Generator that I use to calibrate all my other stuff
against, but again, few Hams will have similar or spend to keep them in
calibration.

In general, oil filled dummy loads with fins like the Birds shown lower on
this page are going to be good, but expensive:

https://www.birdrf.com/Products/Test%20and%20Measurement/Loads/Coaxial-Terminations.aspx

You can find similar ones used, hopefully not abused and not filled with
PCBs.

I've got a similar one that must be decades old and it works well and is
pretty close to 50 ohms over the HF range. I have not opened it to see what
it is filled with!

73,

Mark
W7MLG


On Sat, Aug 25, 2018 at 4:09 PM, Steve Lawrence via Elecraft <
elecraft@mailman.qth.net> wrote:


What are recommended dummy loads to consider for use when running the K3
TX Calibration?

Thanks - Steve WB6RSE
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Re: [Elecraft] K3 TX Calib Dummy Load Recommendations

[Walter Underwood]

Sorry, that is twenty resistors, not fifty.

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

> On Aug 25, 2018, at 5:35 PM, Walter Underwood  wrote:
> 
> I built the Oak Hills Research RFL-100 dummy load kit. It is supposed to be 
> good to
> 144 MHz, so it should be fine at 50. If you’ve never built a kit, this is a 
> good one to
> start with. The kit is $50. I got the $5 BNC option, since my shack is 100% 
> BNC.
> 
> http://www.ohr.com/rfl100.htm
> 
> Here are some photos of my build. Mine measured 49.9 Ω, which is within 0.2%.
> My Ohmmeter is accurate to +/-0.5%, so I’ll take that as a solid 50 Ω. 
> Because the
> dummy load is built with 50 resistors, part tolerances will average out.
> 
> https://observer.wunderwood.org/2016/12/31/building-a-dummy-load/
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
> 
>> On Aug 25, 2018, at 4:49 PM, Mark Goldberg  wrote:
>> 
>> A good one that you know is 50 ohms over the range of frequencies and power
>> you want to use it at. Unfortunately, any particular model may be good or
>> bad, depending on how it has been used or abused. Is there any way you can
>> get access to an analyzer to determine if the dummy load is good? I have a
>> Vector Network Analyzer, but few hams will have one of those.
>> 
>> Also, if you really want to do a real calibration, you should have a
>> calibrated reference to check against. Lots of devices can be 5-10% off if
>> not calibrated, worse if abused or damaged. A Bird meter is only specified
>> to I think 5% of the full scale. So if it is a 200W full scale, it could be
>> 10W off. So 100W might read 110W or 90W.  I've got a calibrated Spectrum
>> Analyzer and Signal Generator that I use to calibrate all my other stuff
>> against, but again, few Hams will have similar or spend to keep them in
>> calibration.
>> 
>> In general, oil filled dummy loads with fins like the Birds shown lower on
>> this page are going to be good, but expensive:
>> 
>> https://www.birdrf.com/Products/Test%20and%20Measurement/Loads/Coaxial-Terminations.aspx
>> 
>> You can find similar ones used, hopefully not abused and not filled with
>> PCBs.
>> 
>> I've got a similar one that must be decades old and it works well and is
>> pretty close to 50 ohms over the HF range. I have not opened it to see what
>> it is filled with!
>> 
>> 73,
>> 
>> Mark
>> W7MLG
>> 
>> 
>> On Sat, Aug 25, 2018 at 4:09 PM, Steve Lawrence via Elecraft <
>> elecraft@mailman.qth.net> wrote:
>> 
>>> What are recommended dummy loads to consider for use when running the K3
>>> TX Calibration?
>>> 
>>> Thanks - Steve WB6RSE
>>> __
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>> 
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Re: [Elecraft] K3 TX Calib Dummy Load Recommendations

[Gwen Patton]

The QRPGuys QRP tuner kit I built is very nice, but don't go over its 12W
limit, or you'll blow the diode.

Thankfully, I have a pile of them on hand just in case. ;)

Gwen NG3P

On Sat, Aug 25, 2018 at 8:36 PM Walter Underwood 
wrote:

> I built the Oak Hills Research RFL-100 dummy load kit. It is supposed to
> be good to
> 144 MHz, so it should be fine at 50. If you’ve never built a kit, this is
> a good one to
> start with. The kit is $50. I got the $5 BNC option, since my shack is
> 100% BNC.
>
> http://www.ohr.com/rfl100.htm
>
> Here are some photos of my build. Mine measured 49.9 Ω, which is within
> 0.2%.
> My Ohmmeter is accurate to +/-0.5%, so I’ll take that as a solid 50 Ω.
> Because the
> dummy load is built with 50 resistors, part tolerances will average out.
>
> https://observer.wunderwood.org/2016/12/31/building-a-dummy-load/
>
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
> > On Aug 25, 2018, at 4:49 PM, Mark Goldberg 
> wrote:
> >
> > A good one that you know is 50 ohms over the range of frequencies and
> power
> > you want to use it at. Unfortunately, any particular model may be good or
> > bad, depending on how it has been used or abused. Is there any way you
> can
> > get access to an analyzer to determine if the dummy load is good? I have
> a
> > Vector Network Analyzer, but few hams will have one of those.
> >
> > Also, if you really want to do a real calibration, you should have a
> > calibrated reference to check against. Lots of devices can be 5-10% off
> if
> > not calibrated, worse if abused or damaged. A Bird meter is only
> specified
> > to I think 5% of the full scale. So if it is a 200W full scale, it could
> be
> > 10W off. So 100W might read 110W or 90W.  I've got a calibrated Spectrum
> > Analyzer and Signal Generator that I use to calibrate all my other stuff
> > against, but again, few Hams will have similar or spend to keep them in
> > calibration.
> >
> > In general, oil filled dummy loads with fins like the Birds shown lower
> on
> > this page are going to be good, but expensive:
> >
> >
> https://www.birdrf.com/Products/Test%20and%20Measurement/Loads/Coaxial-Terminations.aspx
> >
> > You can find similar ones used, hopefully not abused and not filled with
> > PCBs.
> >
> > I've got a similar one that must be decades old and it works well and is
> > pretty close to 50 ohms over the HF range. I have not opened it to see
> what
> > it is filled with!
> >
> > 73,
> >
> > Mark
> > W7MLG
> >
> >
> > On Sat, Aug 25, 2018 at 4:09 PM, Steve Lawrence via Elecraft <
> > elecraft@mailman.qth.net> wrote:
> >
> >> What are recommended dummy loads to consider for use when running the K3
> >> TX Calibration?
> >>
> >> Thanks - Steve WB6RSE
> >> __
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> >> Message delivered to marklgoldb...@gmail.com
> >>
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-- 

-+-+-+-+-
Jenny Everywhere's Infinite: Quark Time
http://quarktime.net
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Re: [Elecraft] K3 TX Calib Dummy Load Recommendations

[Walter Underwood]

I built the Oak Hills Research RFL-100 dummy load kit. It is supposed to be 
good to
144 MHz, so it should be fine at 50. If you’ve never built a kit, this is a 
good one to
start with. The kit is $50. I got the $5 BNC option, since my shack is 100% BNC.

http://www.ohr.com/rfl100.htm

Here are some photos of my build. Mine measured 49.9 Ω, which is within 0.2%.
My Ohmmeter is accurate to +/-0.5%, so I’ll take that as a solid 50 Ω. Because 
the
dummy load is built with 50 resistors, part tolerances will average out.

https://observer.wunderwood.org/2016/12/31/building-a-dummy-load/

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

> On Aug 25, 2018, at 4:49 PM, Mark Goldberg  wrote:
> 
> A good one that you know is 50 ohms over the range of frequencies and power
> you want to use it at. Unfortunately, any particular model may be good or
> bad, depending on how it has been used or abused. Is there any way you can
> get access to an analyzer to determine if the dummy load is good? I have a
> Vector Network Analyzer, but few hams will have one of those.
> 
> Also, if you really want to do a real calibration, you should have a
> calibrated reference to check against. Lots of devices can be 5-10% off if
> not calibrated, worse if abused or damaged. A Bird meter is only specified
> to I think 5% of the full scale. So if it is a 200W full scale, it could be
> 10W off. So 100W might read 110W or 90W.  I've got a calibrated Spectrum
> Analyzer and Signal Generator that I use to calibrate all my other stuff
> against, but again, few Hams will have similar or spend to keep them in
> calibration.
> 
> In general, oil filled dummy loads with fins like the Birds shown lower on
> this page are going to be good, but expensive:
> 
> https://www.birdrf.com/Products/Test%20and%20Measurement/Loads/Coaxial-Terminations.aspx
> 
> You can find similar ones used, hopefully not abused and not filled with
> PCBs.
> 
> I've got a similar one that must be decades old and it works well and is
> pretty close to 50 ohms over the HF range. I have not opened it to see what
> it is filled with!
> 
> 73,
> 
> Mark
> W7MLG
> 
> 
> On Sat, Aug 25, 2018 at 4:09 PM, Steve Lawrence via Elecraft <
> elecraft@mailman.qth.net> wrote:
> 
>> What are recommended dummy loads to consider for use when running the K3
>> TX Calibration?
>> 
>> Thanks - Steve WB6RSE
>> __
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>> 
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[Elecraft] OT: Dummy loads

[Ken G Kopp]

Caution ... Some higher wattage resistors use iron wire windings which are
of course inductive and are unsuitable for RF dummy loads.

73!

K0PP
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Re: [Elecraft] K3 TX Calib Dummy Load Recommendations

[Grant Youngman]

Any decent commercial nominally 50 ohm 100W+ DL ought to work fine, as long as 
it isn’t a piece of junk that falls apart at 50 MHz.  It doesn’t need to be 
NIST traceable :-)

Grant NQ5T
K3 #2091 KX3 #8342

> On Aug 25, 2018, at 7:09 PM, Steve Lawrence via Elecraft 
>  wrote:
> 
> What are recommended dummy loads to consider for use when running the K3 TX 
> Calibration?
> 

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Re: [Elecraft] K3 TX Calib Dummy Load Recommendations

[Mark Goldberg]

A good one that you know is 50 ohms over the range of frequencies and power
you want to use it at. Unfortunately, any particular model may be good or
bad, depending on how it has been used or abused. Is there any way you can
get access to an analyzer to determine if the dummy load is good? I have a
Vector Network Analyzer, but few hams will have one of those.

Also, if you really want to do a real calibration, you should have a
calibrated reference to check against. Lots of devices can be 5-10% off if
not calibrated, worse if abused or damaged. A Bird meter is only specified
to I think 5% of the full scale. So if it is a 200W full scale, it could be
10W off. So 100W might read 110W or 90W.  I've got a calibrated Spectrum
Analyzer and Signal Generator that I use to calibrate all my other stuff
against, but again, few Hams will have similar or spend to keep them in
calibration.

In general, oil filled dummy loads with fins like the Birds shown lower on
this page are going to be good, but expensive:

https://www.birdrf.com/Products/Test%20and%20Measurement/Loads/Coaxial-Terminations.aspx

You can find similar ones used, hopefully not abused and not filled with
PCBs.

I've got a similar one that must be decades old and it works well and is
pretty close to 50 ohms over the HF range. I have not opened it to see what
it is filled with!

73,

Mark
W7MLG


On Sat, Aug 25, 2018 at 4:09 PM, Steve Lawrence via Elecraft <
elecraft@mailman.qth.net> wrote:

> What are recommended dummy loads to consider for use when running the K3
> TX Calibration?
>
> Thanks - Steve WB6RSE
> __
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[Elecraft] K3 TX Calib Dummy Load Recommendations

[Steve Lawrence via Elecraft]

What are recommended dummy loads to consider for use when running the K3 TX 
Calibration?

Thanks - Steve WB6RSE
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[Elecraft] KX2 KXIO2 RTC Adjustment

[Tim McDonough N9PUZ]

I have a KX2 with the internal tuner and the KXIO2 clock module which I 
purchased used and it is long out of warranty. The clock gains a nearly 
minute per day in spite of having performed the calibration/adjustment.


Elecraft advised that while they are more than happy to repair it by the 
time I pay for labor and shipping both ways it is probably better to buy 
a new KXIO2 module which will have a warranty. I can appreciate that and 
don't fault them a bit for the price but I'm just wondering if anyone 
has a suggestion for a DIY repair. I spend plenty of money on the hobby 
but am just wondering if I can get a working internal clock for less 
than $80 plus shipping?


Tim -- N9PUZ
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Re: [Elecraft] K3 Macro Question - setting the LINE IN level

[tomb18]

HiI believe that is missing in the API.73


Sent from my Samsung Galaxy smartphone.
 Original message From: Mike Flowers  
Date: 2018-08-25  11:20 AM  (GMT-05:00) To: elecraft@mailman.qth.net Subject: 
[Elecraft] K3 Macro Question - setting the LINE IN level 
Hi Gang,

 

I've got a macro string that sets the K3 to LINE IN, compression to 0, and
monitor level to 2.    I expected that once LINE IN was selected, then
MG016; would set the LINE IN level to 16.

 

But it doesn't.    I've searched the K3 Programmers Reference but I seem to
be missing this command. 

 

MN053;UP;UP;MG016;CP000;ML002;MN255;

 

So, is there a macro command to set LINE IN level?

 

Thanks!

 

- 73 and good DX de Mike,   K6MKF, Past
President -   NCDXC 

 

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[Elecraft] K3 Macro Question - setting the LINE IN level

[Mike Flowers]

Hi Gang,

 

I've got a macro string that sets the K3 to LINE IN, compression to 0, and
monitor level to 2.I expected that once LINE IN was selected, then
MG016; would set the LINE IN level to 16.

 

But it doesn't.I've searched the K3 Programmers Reference but I seem to
be missing this command. 

 

MN053;UP;UP;MG016;CP000;ML002;MN255;

 

So, is there a macro command to set LINE IN level?

 

Thanks!

 

- 73 and good DX de Mike,   K6MKF, Past
President -   NCDXC 

 

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Re: [Elecraft] Hey, guys and gals! There's a new QRP Sprint in town!

[Josh Fiden]

This is concurrent with California QSO Party (cqp.org). So, you'll have a whole 
lot of stations calling CQ CQP while the QRP Leaf Peepers are calling CQLP. 
Confusing?

73
Josh W6XU

Sent from my mobile device

> On Aug 24, 2018, at 8:39 PM, Larry W2LJ  wrote:
> 
> Leaf Peepers QRP Sprint...Saturday, October 6th from 1700 to 2100 UTC. For 
> all the details and to sign up for a Leaf Peeper number, please visit - 
> https://w3atb.com/leaf-peepers-qrp-contest/
> 

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