Re: [Elecraft] K3S QST Article

[Wes Stewart]

Without too much elaboration let's just say that I discovered this problem long 
before ARRL did.  (S/N 10020)


I can tell you that my measurements show that IMD varies with Vcc (Vdd), drive 
level, power output and frequency.  This latter parameter is, as best as I can 
determine, inexplicable by anyone, including the manufacturers of the 
transistors.  Initially, I compared my shiny new K3S to my tired old, unmodified 
K3.  At the original test frequency, 3.8 MHz the K3 had much lower IMD that the 
K3S under otherwise the same test conditions.  Moving up to 14 MHz the situation 
reversed.  Each of these radios had a different "sweet spot," neither of which 
was representative of the general case.  If a testing entity happens to test at 
only one frequency and reports the results as typical then you get a false sense 
of the general performance.


Wes, N7WS

On 10/14/2016 8:03 PM, Dave Hachadorian wrote:

Yaesu FT-990, 12V finals
3rd order TX IMD  -38dB
ARRL Review 11/91

ARRL heaped glowing praise upon this rig way back in 1991 for its
Tx IMD performance.  So, what was Yaesu's secret, and why haven't 
manufacturers figured it out and capitalized on it ever since?


Dave Hachadorian, K6LL
Yuma, Arizona


-Original Message- From: Kevin
Sent: Friday, October 14, 2016 5:14 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3S QST Article

The cause for this is the use of 12V finals. It would be much
improved
by moving to 24 or 50V finals.

Move the /K3s II/ to 50V finals, say a pair of MRF 150's, limited
to 150
or 200W max output. Design/Sell an outboard 50V switching supply
capable
of 15-20A continuous current, with a 10A 12V switcher built in
for the
rest of the radio.


On 10/14/2016 1:33 PM, Bill Leonard N0CU wrote:

I would not expect the synthesizer (old or new) to be a
contributor the IMD
issue. Hopefully someone will correct me if that is a bad
assumption. To me,
the primary issue appears to be the linearity of the two RF
power
amplifiers.






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Re: [Elecraft] K3S QST Article

[Edward R Cole]

OK.  I purchased the K3/10 in 2010 which is able to output up to 12w.

Is the low power amp any better at IMD, or subject to the same 
limitations because its 12v transistors?
I bought the KXPA-100 last year.  Would it be any better than the 
KPA3 or KPA3A?  3rd-order IMD in the vicinity of -30 dBc is about 
what I have read for specs my many 12v power devices.


I bought the new synth because I understood it would improve Rx 
performance (haven't installed them yet main & sub Rx).  Also for K3 
use at 630m.


Would running the K3/10 at 5w driving a linear amp be lower in 
IMD?  The amp uses 50v devices and made for TV which has greater 
linearity specs than SSB. I am also running it at about 60% full output on 6m.


73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com

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[Elecraft] K2 Serial Port Question

[Brad Brooks]

While I continue to review the list archives, I am requesting feedback from the 
group with regard to possible failure modes of the KIO2 board. This rig is in 
loan to me, with the loaner stating that it was claimed working when he 
acquired it from a previous owner, but had not himself tested serial operation.

K2/100 SN 879

Performed configuration and testing outlined in the KIO2 manual. Tests tried 
with no positive results:
- Known good FTDI serial-to-USB interface
- known good "real" serial port.
- serial breakout cable configured per manual.

I have not yet put pins 2 and 3 on the scope to determine if the board has 
failed. I am interested if anyone else has wrestled, and won, KIO2 failures.

Of course, I am open to configuration and user error on my part. I have been 
prone to foolishness in the past.

73 Brad WF7T
Nashville y'all.

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Re: [Elecraft] OT Rotatable Dipole Project

[Elecraft K3]

Thanks for the flowers Ron.  The one compromise I ended up making was not 
getting the aluminum up a full half wave in the air.  Fully half the 
directionality is down a steep hill, so electrically it meets that criteria. 
However the other half is back into the hillside so in that direction not so 
much.  It has still been a very worthwhile pursuit.  This antenna beats my 80m 
@ .5 wave doublet multiband antenna.

I hope this has been helpful.

73 de Eric, KG6MZS


> On Oct 14, 2016, at 7:43 PM, Ron D'Eau Claire  wrote:
> 
>  A rotatable dipoles offer an advantage when
> they are up high enough (>1/2 wavelength) to provide significant
> directivity. 

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Re: [Elecraft] OT Rotatable Dipole Project

[Ron D'Eau Claire]

Actually I should have said 130 feet up! 

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron
D'Eau Claire
Sent: Friday, October 14, 2016 7:43 PM
To: 'Elecraft K3'; 'Mailman'
Subject: Re: [Elecraft] OT Rotatable Dipole Project

Beautiful installation Eric. A rotatable dipoles offer an advantage when
they are up high enough (>1/2 wavelength) to provide significant
directivity. 

Unfortunately that is a little difficult for most of us on 80 meters where
the antenna is 130 feet long and needs to be 65 feet up, but some have
actually done it!! 

Perhaps that will be your next project, Hi! 

Have fun!! 

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Elecraft K3
Sent: Friday, October 14, 2016 4:38 PM
To: Mailman
Subject: [Elecraft] OT Rotatable Dipole Project

Hello List,

Sorry for the OT posting but I want to share my new antenna.  My K3 and this
antenna have been a joy to operate.

Here is the blog on it for anybody who might be interested:

http://hankstamper.tumblr.com/post/149327414925/full-sized-20m-rotatable-dip
ole-project

73 de Eric, KG6MZS
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Re: [Elecraft] K3S QST Article

[Dave Hachadorian]

Yaesu FT-990, 12V finals
3rd order TX IMD  -38dB
ARRL Review 11/91

ARRL heaped glowing praise upon this rig way back in 1991 for its
Tx IMD performance.  So, what was Yaesu's secret, and why haven't 
manufacturers figured it out and capitalized on it ever since?


Dave Hachadorian, K6LL
Yuma, Arizona


-Original Message- 
From: Kevin

Sent: Friday, October 14, 2016 5:14 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3S QST Article

The cause for this is the use of 12V finals. It would be much
improved
by moving to 24 or 50V finals.

Move the /K3s II/ to 50V finals, say a pair of MRF 150's, limited
to 150
or 200W max output. Design/Sell an outboard 50V switching supply
capable
of 15-20A continuous current, with a 10A 12V switcher built in
for the
rest of the radio.


On 10/14/2016 1:33 PM, Bill Leonard N0CU wrote:

I would not expect the synthesizer (old or new) to be a
contributor the IMD
issue. Hopefully someone will correct me if that is a bad
assumption. To me,
the primary issue appears to be the linearity of the two RF
power
amplifiers.




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



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Re: [Elecraft] OT Rotatable Dipole Project

[Ron D'Eau Claire]

Beautiful installation Eric. A rotatable dipoles offer an advantage when
they are up high enough (>1/2 wavelength) to provide significant
directivity. 

Unfortunately that is a little difficult for most of us on 80 meters where
the antenna is 130 feet long and needs to be 65 feet up, but some have
actually done it!! 

Perhaps that will be your next project, Hi! 

Have fun!! 

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Elecraft K3
Sent: Friday, October 14, 2016 4:38 PM
To: Mailman
Subject: [Elecraft] OT Rotatable Dipole Project

Hello List,

Sorry for the OT posting but I want to share my new antenna.  My K3 and this
antenna have been a joy to operate.

Here is the blog on it for anybody who might be interested:

http://hankstamper.tumblr.com/post/149327414925/full-sized-20m-rotatable-dip
ole-project

73 de Eric, KG6MZS
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Re: [Elecraft] OT Rotatable Dipole Project

[Vic Rosenthal]

Rotary dipoles work! It's remarkable how directive a dipole can be. And you 
don't have to worry about LP vs. SP propagation.
I also have a full size 20m version. I wrote an article about how I made it 
work on all the bands from 40-10 meters with high power (1.2 kW):
http://cwops.org/newsletter/2016/08scopy16aug.pdf

Vic 4X6GP

> On 15 Oct 2016, at 02:38, Elecraft K3  wrote:
> 
> Hello List,
> 
> Sorry for the OT posting but I want to share my new antenna.  My K3 and this 
> antenna have been a joy to operate.
> 
> Here is the blog on it for anybody who might be interested:
> 
> http://hankstamper.tumblr.com/post/149327414925/full-sized-20m-rotatable-dipole-project
> 
> 73 de Eric, KG6MZS
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Re: [Elecraft] K3S QST Article

[Charlie T, K3ICH]

Or, we could all run 32S-3 transmitters and listen on our whiz/bang SDR.  
So far, they're about the cleanest 100 watt transmitter reasonably
available.

73, Charlie k3ICH



-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Kevin
Sent: Friday, October 14, 2016 8:14 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3S QST Article

The cause for this is the use of 12V finals. It would be much improved by
moving to 24 or 50V finals.

Move the /K3s II/ to 50V finals, say a pair of MRF 150's, limited to 150 or
200W max output. Design/Sell an outboard 50V switching supply capable of
15-20A continuous current, with a 10A 12V switcher built in for the rest of
the radio.


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Re: [Elecraft] K3S QST Article

[Kevin]

The cause for this is the use of 12V finals. It would be much improved 
by moving to 24 or 50V finals.


Move the /K3s II/ to 50V finals, say a pair of MRF 150's, limited to 150 
or 200W max output. Design/Sell an outboard 50V switching supply capable 
of 15-20A continuous current, with a 10A 12V switcher built in for the 
rest of the radio.



On 10/14/2016 1:33 PM, Bill Leonard N0CU wrote:

I would not expect the synthesizer (old or new) to be a contributor the IMD
issue. Hopefully someone will correct me if that is a bad assumption. To me,
the primary issue appears to be the linearity of the two RF power
amplifiers.




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



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Re: [Elecraft] KXPA100 with Other Radios

[Don Wilhelm]

Jose,

See page 18 of the KXPA100 manual.  Yes, you must provide a connection 
that grounds the PA KEY connection to the KXPA100.


I do not know of a commercial cable that will provide KEYOUT from the 
Flex to the KXPA100.


If you are not able to build the cable yourself due to whatever 
problems, perhaps you can find a local ham who would be willing to 
assist you with the soldering and cable construction.  Look for a ham 
who has been licensed for many years (likely has a 1X3 call).  We used 
to build our own gear and questions like this rarely came up.  We were 
all expected to be able to do soldering and follow a schematic by our 
peers.  Sadly, those days seem to be no longer the norm.


73,
Don W3FPR

On 10/14/2016 6:58 PM, Jose Rivera wrote:

I am a happy KX3, KXPA100 owner.  I had the opportunity to obtain a Flex-1500 
radio. I want to use the
Flex-1500 with the KXPA100, since the Flex is a qrp radio.

My question: Do I have to have a cable running into the KXPA's PTT plug or can 
the KXPA100 be keyed up by
the Flex-1500 via just coax connections?

I am terrible making cables and soldering, which is why I am loath to attempt 
to make a cable. And no one
seems to sell such a cable. The Flex-1500 has a nine pin female DIN, While the 
KXPA100 has an RCA PTT.

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[Elecraft] OT Rotatable Dipole Project

[Elecraft K3]

Hello List,

Sorry for the OT posting but I want to share my new antenna.  My K3 and this 
antenna have been a joy to operate.

Here is the blog on it for anybody who might be interested:

http://hankstamper.tumblr.com/post/149327414925/full-sized-20m-rotatable-dipole-project

73 de Eric, KG6MZS
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[Elecraft] KXPA100 with Other Radios

[Jose Rivera]

I am a happy KX3, KXPA100 owner.  I had the opportunity to obtain a Flex-1500 
radio. I want to use the
Flex-1500 with the KXPA100, since the Flex is a qrp radio. 

My question: Do I have to have a cable running into the KXPA's PTT plug or can 
the KXPA100 be keyed up by
the Flex-1500 via just coax connections?

I am terrible making cables and soldering, which is why I am loath to attempt 
to make a cable. And no one
seems to sell such a cable. The Flex-1500 has a nine pin female DIN, While the 
KXPA100 has an RCA PTT.

 

Jose

N2LRB

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Re: [Elecraft] e: Windows Emulator

[Bob Nielsen]

There is a WSPR-X app for the Mac.

Bob, N7XY


On 10/14/16 10:56 AM, Brian Pietrzyk wrote:

I worked in the IT industry and worked intensely with Windows since the pre DOS 
days. I transitioned to Mac about 6 years ago and it has been my primary OS 
since. I find I rarely need windows for much else then programming my radios 
and a few apps such as WSPR. The rest I can do on Mac.

If you can upgrade your mac to 16gb ram (check out https://www.macsales.com/) 
then running Windows in a VM such as Fusion or Parallels works great. For the 
MacBook Air or older MacBook users with 8 or even 4gb ram the best option is to 
set aside 20gb disc space and load Windows into a BootCamp partition (just run 
the BootCam assistant) because of its full Intel chipset. The computer is then 
a dual boot and can boot directly into Windows. Its the best way to go for I/O 
complex apps such as FreeDV or HRD. Its way cheaper then buying a separate 
windows computer if you want to stay on a single computer.

I strongly suggest resisting the temptation to make any audio connections 
directly between the radio and the mac. If your rig does not have a USB port, 
get a something opto-isolated in-between such as a Signalink USB or equivalent.

Brian ve3bwp

Date: Wed, 12 Oct 2016 11:39:42 -0600
From: John Evans 
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Windows Emulator
Message-ID:

[Elecraft] Fwd: NaP3 version 5

[Roger D Johnson]

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Re: [Elecraft] K3S QST Article

[Wayne Burdick]

> Based upon your experience and understanding of the issue, would an original 
> K3 (not K3s) with the new synths have better TX IMD?  In other words, is the 
> poor TX IMD of the K3s a function of some part of the rig not associated with 
> the new synths?
> 
> Dave   AB7E


Hi all,

This has nothing to do with the new synthesizer.

Normally, the K3S (or K3) has worst-case TX 3rd-order IMD in the vicinity of 
-30 dBc (ARRL method) at rated power (10 W/100 W +/- 1 dB on most bands; see 
specs for exceptions). Nearly all other 12-V-capable transceivers are in this 
same range, because they all use approximately the same circuitry and PA 
devices. 

We have made changes in K3S production that improve average IMD performance at 
both low and high power levels by as much as 3 dB. We will make these changes 
free of charge on any K3S returned to the factory for this purpose, whether or 
not it is still in the warranty period. The only charge would be for return 
shipping.

The changes were phased in at the following serial numbers:

  KPA3A (100 W PA option):Factory assembled, #10852Kit, #10864
  LPA (10 W module):  Factory assembled, #10920Kit, #10939

Please email k3supp...@elecraft.com if you have any further questions.

73,
Wayne
N6KR




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Re: [Elecraft] Is the K3 have low sensitivity on 10 M and 6 M

[n9tf]

I have always done the same thing with signals at the noise floor, or below. 
The biggest change I've noticed by doing this is the band noise is much more 
attenuated through the headphones lying on the table and the signal one is 
trying to copy jumps out in the clear since band noise is attenuated. 
  
73 Gene N9TF 

- Original Message -

  "Fred Jensen" k6...@foothill.net 
  
  
Related subject:  An old CW RO's trick when copying a weak signal in 
noise and QRM is to lay the headphones on the desk face up.  I learned 
this years ago on the Holy Frequency.  I have no idea why it works, but 
it often does.  Maybe one of the acoustic experts here will explain it. 

73, 

Fred K6DGW 
Sparks NV USA 
Washoe County DM09dn 

On 10/14/2016 6:53 AM, brian wrote: 
> This test may be a bit out of date. 
> 
> With digital modes decoding signals ~10 db below the noise these days, 
> one may need at least two S-units of noise. 
> 
> 73 de Brian/K3KO 

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Re: [Elecraft] Is the K3 have low sensitivity on 10 M and 6 M

[Fred Jensen]

Interesting point ... Right after getting the new synth for my K3, I was 
copying a number of WSPR stations on 630 meters.  I even got up in the 
middle of the night to see if I could hear them [I couldn't] as the 
computer copied them at - 10 to -15 dB SNR.  At first consideration, I 
don't see what effect a preamp would have had, SNR is still the same.


Related subject:  An old CW RO's trick when copying a weak signal in 
noise and QRM is to lay the headphones on the desk face up.  I learned 
this years ago on the Holy Frequency.  I have no idea why it works, but 
it often does.  Maybe one of the acoustic experts here will explain it.


73,

Fred K6DGW
Sparks NV USA
Washoe County DM09dn

On 10/14/2016 6:53 AM, brian wrote:

This test may be a bit out of date.

With digital modes decoding signals ~10 db below the noise these days,
one may need at least two S-units of noise.

73 de Brian/K3KO


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Re: [Elecraft] K3S QST Article

[Bill Leonard N0CU]

I would not expect the synthesizer (old or new) to be a contributor the IMD
issue. Hopefully someone will correct me if that is a bad assumption. To me,
the primary issue appears to be the linearity of the two RF power
amplifiers.

During the course of my troubleshooting, I noticed that a number of changes
were made to the original KLPA3 in the process of getting to the new KLPA3A
design. I would be interested in knowing how the IMD performance of the
original design compares to the new KLPA3A design.

Bill  N0CU



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Re: [Elecraft] K3S QST Article

[ab2tc]

Hi all,

I, too. prefer the paper copy, but the mention of a K3S review got me too
intrigued, so I had to read it online.

As for the other comments in this thread, I find this situation more than a
little worrisome and certainly an official Elecraft response is hoped for.
Are the updates being tested by the ARRL and published as their final
findings in their performance tables even into production yet?

AB2TC - Knut

Wes Stewart-2 wrote
> Hi Knut,
> 
> Yes, I get a notification about the digital issue, but I prefer to read
> the 
> paper copy, so I wait.  It did come yesterday so I've seen it now.
> 
> Wes
> 





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[Elecraft] e: Windows Emulator

[Brian Pietrzyk]

I worked in the IT industry and worked intensely with Windows since the pre DOS 
days. I transitioned to Mac about 6 years ago and it has been my primary OS 
since. I find I rarely need windows for much else then programming my radios 
and a few apps such as WSPR. The rest I can do on Mac. 

If you can upgrade your mac to 16gb ram (check out https://www.macsales.com/) 
then running Windows in a VM such as Fusion or Parallels works great. For the 
MacBook Air or older MacBook users with 8 or even 4gb ram the best option is to 
set aside 20gb disc space and load Windows into a BootCamp partition (just run 
the BootCam assistant) because of its full Intel chipset. The computer is then 
a dual boot and can boot directly into Windows. Its the best way to go for I/O 
complex apps such as FreeDV or HRD. Its way cheaper then buying a separate 
windows computer if you want to stay on a single computer. 

I strongly suggest resisting the temptation to make any audio connections 
directly between the radio and the mac. If your rig does not have a USB port, 
get a something opto-isolated in-between such as a Signalink USB or equivalent. 

Brian ve3bwp

Date: Wed, 12 Oct 2016 11:39:42 -0600
From: John Evans 
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Windows Emulator
Message-ID:
   

Re: [Elecraft] R: K3s vs K3's

[Nr4c]

I believe the new radio is a K3S, not a K3s. Elecraft use the upper case "S" in 
a smaller size for the logo. 

Now I don't know how to tell a lower case "s" from an upper case except for 
size. Go figure. 

Sent from my iPhone
...nr4c. bill


> On Oct 14, 2016, at 11:20 AM, Joe Subich, W4TV  wrote:
> 
> 
> > use the terms K3's or K3s'
> 
> Grammatically incorrect.  Use of the apostrophe indicates possessive as
> in "belonging to the K3 or K3s" - for example "the K3's VFO A knob".
> 
> 73,
> 
>   ... Joe, W4TV
> 
>> On 10/14/2016 10:59 AM, Charlie T, K3ICH wrote:
>> Due to the odd way Elecraft chose to label the new K3s, I would request that
>> when referring to multiple radios, use the terms K3's or K3s' rather than
>> simply K3s which implies a single radio.
>> 
>> 73, Charlie k3ICH
>> 
>> 
>> 
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[Elecraft] K3S vs K3s

[Ken G Kopp]

When Rose does the embroidery on a case or cover for a K3s she always gives
the customer the option of which "s" to use.  She has both versions set up
in her machine's software.  The size of the "s" meets Elecraft's "specs",
BTW.

So far she's not had an order for a K3S cover or case.

73!

Ken - K0PP
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Re: [Elecraft] Elecraft] R: K3s vs K3's

[Fred C. Jensen]

In the Lao (and Thai) language, there are no plural forms.  It would be either 
"K3s" meaning one, or "n K3s" where n is the number of radios. English is as 
obscure as C.

73,

Fred K6DGW
Sparks NV

Mark via Elecraft  wrote:
>Re:   >> use the terms K3's or K3s'<<
>
>>Grammatically incorrect.  Use of the>
>>apostrophe indicates possessive<
>
>Well, not always.  Websters New World Dictionary (mine is a 1965 edition and 
>getting pretty used up) lists six uses for the apostrophe, with number six 
>being:
>
>"6)  in the forming the PLURAL of letters, numbers, etc.  Example:  He 
>pronounced his th's like s's.  She made her l's look like 7's."
>
>So, given that, more than one K3 would be K3's.
>
>Wayne requested that one K3s be just that, K3s.  Does that make more than one 
>K3s be K3s' or K3s's.  I think it would be K3s', but I can't find the rule 
>that says to drop the last s.  It is in this dictionary...somewhere.
>
>Mark
>KE6BB
>
> Original message From: "Joe Subich, W4TV"  
>Date: 10/14/16  8:20 AM  (GMT-08:00) To: elecraft@mailman.qth.net Subject: Re: 
>[Elecraft] R: K3s vs K3's 
>
> > use the terms K3's or K3s'
>
>Grammatically incorrect.  Use of the apostrophe indicates possessive as
>in "belonging to the K3 or K3s" - for example "the K3's VFO A knob".
>
>73,
>
>    ... Joe, W4TV
>
>On 10/14/2016 10:59 AM, Charlie T, K3ICH wrote:
>> Due to the odd way Elecraft chose to label the new K3s, I would request that
>> when referring to multiple radios, use the terms K3's or K3s' rather than
>> simply K3s which implies a single radio.
>>
>> 73, Charlie k3ICH
>>
>>
>>
>> __
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>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>
>
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Re: [Elecraft] K3S QST Article

[David Gilbert]

Based upon your experience and understanding of the issue, would an 
original K3 (not K3s) with the new synths have better TX IMD?  In other 
words, is the poor TX IMD of the K3s a function of some part of the rig 
not associated with the new synths?


Dave   AB7E


On 10/14/2016 9:06 AM, Bill Leonard N0CU wrote:

I was not surprised to see a comment about the Tx IMDs in the QST article.
One of the first problems I encountered with my new K3s/10 was poor Tx IMD
performance. What I observed was flat topping that started at about 5W, and
progressively got worse as the power was increased. The distortion was so
bad at 10W, the envelope looked more like a squarewave than a two tone
signal, and the 3rd order products were down only -18 dBc. After several
months of working with Wayne, Rene, and the designer of the KLPA3A
amplifier, replacing the KLPA3A three times, and sending the radio to the
factory, the problem was reduced, but I still don't see better than -28 dBc
at 10W out. Not wanting to send the radio in to the factory a second time, I
decided to just live with the performance.

The transmit signal generation in the K3s is a complex process based around
the internal computer. Signal quality is affected by ALC, transmit power
level, configuration settings, and the transmit power CAL, however, from all
of the testing that I did, the signal going into the KLPA3A was very clean
(-40 dBc). It is also important to note that Elecraft's approach to
distortion management includes spreading the energy in the distortion out
spectrally by the use of pre-distortion. This results in 5th, 7th, 9th,...
order products being higher compared to some radios, as noted in the QST
article.

The QST article indicated that both the KLPA3A and the KPA3A have been
modified to address the Tx IMD problem. I am hopeful that at some point
Elecraft will offer some info/options that will allow us to bring the
unmodified radios up to the performance shown in the QST article

Bill  N0CU



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Re: [Elecraft] R: K3s vs K3's

[Mark via Elecraft]

Re:   "Wayne posted this message early in the K3S era..."

Good find, Phil.  I think that would make more than one K3S be K3S's.  That is 
just my opinion and it is free, so take it for what it is worth.  Mr. Websters 
rules were not free.  I had to pay for them.  

Mark,
KE6BB

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Re: [Elecraft] K3S QST Article

[Bill Leonard N0CU]

I was not surprised to see a comment about the Tx IMDs in the QST article.
One of the first problems I encountered with my new K3s/10 was poor Tx IMD
performance. What I observed was flat topping that started at about 5W, and
progressively got worse as the power was increased. The distortion was so
bad at 10W, the envelope looked more like a squarewave than a two tone
signal, and the 3rd order products were down only -18 dBc. After several
months of working with Wayne, Rene, and the designer of the KLPA3A
amplifier, replacing the KLPA3A three times, and sending the radio to the
factory, the problem was reduced, but I still don't see better than -28 dBc
at 10W out. Not wanting to send the radio in to the factory a second time, I
decided to just live with the performance.

The transmit signal generation in the K3s is a complex process based around
the internal computer. Signal quality is affected by ALC, transmit power
level, configuration settings, and the transmit power CAL, however, from all
of the testing that I did, the signal going into the KLPA3A was very clean
(-40 dBc). It is also important to note that Elecraft's approach to
distortion management includes spreading the energy in the distortion out
spectrally by the use of pre-distortion. This results in 5th, 7th, 9th,...
order products being higher compared to some radios, as noted in the QST
article.

The QST article indicated that both the KLPA3A and the KPA3A have been
modified to address the Tx IMD problem. I am hopeful that at some point
Elecraft will offer some info/options that will allow us to bring the
unmodified radios up to the performance shown in the QST article

Bill  N0CU



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Re: [Elecraft] R: K3s vs K3's

[Mark via Elecraft]

Re:   >> use the terms K3's or K3s'<<

>Grammatically incorrect.  Use of the>
>apostrophe indicates possessive<

Well, not always.  Websters New World Dictionary (mine is a 1965 edition and 
getting pretty used up) lists six uses for the apostrophe, with number six 
being:

"6)  in the forming the PLURAL of letters, numbers, etc.  Example:  He 
pronounced his th's like s's.  She made her l's look like 7's."

So, given that, more than one K3 would be K3's.

Wayne requested that one K3s be just that, K3s.  Does that make more than one 
K3s be K3s' or K3s's.  I think it would be K3s', but I can't find the rule that 
says to drop the last s.  It is in this dictionary...somewhere.

Mark
KE6BB

 Original message From: "Joe Subich, W4TV"  
Date: 10/14/16  8:20 AM  (GMT-08:00) To: elecraft@mailman.qth.net Subject: Re: 
[Elecraft] R: K3s vs K3's 

 > use the terms K3's or K3s'

Grammatically incorrect.  Use of the apostrophe indicates possessive as
in "belonging to the K3 or K3s" - for example "the K3's VFO A knob".

73,

    ... Joe, W4TV

On 10/14/2016 10:59 AM, Charlie T, K3ICH wrote:
> Due to the odd way Elecraft chose to label the new K3s, I would request that
> when referring to multiple radios, use the terms K3's or K3s' rather than
> simply K3s which implies a single radio.
>
> 73, Charlie k3ICH
>
>
>
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Re: [Elecraft] R: K3s vs K3's

[Phil Wheeler]

Wayne posted this message early in the K3S era:

--

*List: elecraft 
 Subject: 
Re: [Elecraft] K3s and K3S. 
 
From: Wayne Burdick  
 
Date: 2015-05-14 21:55:23 
*


Generally it's supposed to be "K3S" (capital). Please use that in email.

However, on the radio itself, and in the owner's manual (etc.) we use a 
slightly \
smaller capital "S". To be specific, about 85% of a full-height capital. This 
just \
seemed like the right thing to do. Don't get me started on branding and graphic 
\
design

I'm looking forward to seeing a blog post with the official "S" scaling :)

73,
Wayne
N6KR

-

That seems pretty "Elecraft official" to me :-)

Phil W7OX

On 10/14/16 7:59 AM, Charlie T, K3ICH wrote:

Due to the odd way Elecraft chose to label the new K3s, I would request that
when referring to multiple radios, use the terms K3's or K3s' rather than
simply K3s which implies a single radio.

73, Charlie k3ICH


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Re: [Elecraft] K3s vs K3's

[GRANT YOUNGMAN]

In text, on the website, etc. Elecraft calls the new radio the K3S — capital 
“S".  So 2 K3s or 2 K3Ss, would be clear — presuming cats can be herded well 
enough to manage a bit of consistency ;)


Grant NQ5T
K3 #2091, KX3 #8342

> On Oct 14, 2016, at 11:20 AM, Joe Subich, W4TV  wrote:
> 
> 
> > use the terms K3's or K3s'
> 
> Grammatically incorrect.  Use of the apostrophe indicates possessive as
> in "belonging to the K3 or K3s" - for example "the K3's VFO A knob".
> 
> 73,
> 
>   ... Joe, W4TV
> 
> On 10/14/2016 10:59 AM, Charlie T, K3ICH wrote:
>> Due to the odd way Elecraft chose to label the new K3s, I would request that
>> when referring to multiple radios, use the terms K3's or K3s' rather than
>> simply K3s which implies a single radio.
>> 
>> 73, Charlie k3ICH




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Re: [Elecraft] R: K3s vs K3's

[Joe Subich, W4TV]

> use the terms K3's or K3s'

Grammatically incorrect.  Use of the apostrophe indicates possessive as
in "belonging to the K3 or K3s" - for example "the K3's VFO A knob".

73,

   ... Joe, W4TV

On 10/14/2016 10:59 AM, Charlie T, K3ICH wrote:

Due to the odd way Elecraft chose to label the new K3s, I would request that
when referring to multiple radios, use the terms K3's or K3s' rather than
simply K3s which implies a single radio.

73, Charlie k3ICH



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Re: [Elecraft] R: K3s vs K3's

[Charlie T, K3ICH]

Due to the odd way Elecraft chose to label the new K3s, I would request that
when referring to multiple radios, use the terms K3's or K3s' rather than
simply K3s which implies a single radio.

73, Charlie k3ICH



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Re: [Elecraft] R: Re: K3S - K3 Noise Blanker and Noise Reductor

[Charlie T, K3ICH]

Great advice Don.  (Nice website too.)

One little point I would add to comments about listening to whether you hear
band noise when connecting that antenna,  is that if you're performing this
test at VHF, or even the high end of the HF,  the actual
connection/disconnection of the antenna should be from the back panel of the
radio, not via an antenna switch with some undetermined length of coax.
What can happen is that sometimes simply connecting an open length of coax
to the antenna input may change the audible noise coming from the receiver's
speaker.   I haven't tried this with my K3s, but I've observed this effect
with other *  radios, especially ones which depend on good input impedance
matching for their antenna inputs.

This effect is related to the length of the coax relative to the frequency
you're listening to, so I doubt if it would be noticeable below, say 10 or
15 M with a few feet of line to an antenna switch.

73, Charlie k3ICH

*I specialize in the restoration of the Collins 51S-1 receivers, and have
noticed this effect with them.  The 51S-1's sensitivity is quite susceptible
to degrading from an unmatched antenna.   During an alignment,  I see a
small, but noticeable difference in the antenna input coil adjustments from
using a matched 50 Ω signal generator versus leaving the antenna input open
and relying on the calibrator signal for peaking.


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Re: [Elecraft] Is the K3 have low sensitivity on 10 M and 6 M

[brian]

This test may be a bit out of date.

With digital modes decoding signals ~10 db below the noise these days, 
one may need at least two S-units of noise.


73 de Brian/K3KO

On 10/14/2016 0:04 AM, Fred Jensen wrote:

Re #3: I never have either.  While a thorough analysis of "To Preamp or
Not to Preamp" is complex and very situational, the antenna check is
really a very good indicator:

Remove the antenna and note the noise produced by the K3.  Connect the
antenna.  If the noise rises, adding a preamp at the radio isn't likely
to do much for you.  At the antenna, it can compensate for loss in the
transmission line, but that's not likely very high on 10m or even 6m
unless your coax is very long or full of water.

My experience is:  When the noise rises by connecting the antenna and I
still can't hear the signals, I need a better antenna. [:-)

73,

Fred K6DGW
- Sparks NV DM09dn

- Northern California Contest Club
- CU in the Cal QSO Party 7-8 Oct 2017
- www.cqp.org

On 10/13/2016 5:46 AM, Bill W4ZV wrote:

1.  Is your PREamp turned on for 10m?  Hopefully you don't
accidentally have
RX ANT activated.
2.  Please describe your antenna in more detail, including orientation.
3.  I've never needed a preamp on 10m in the 8 years I've had a K3,
but my
antenna system has a lot of gain.

73,  Bill  W4ZV


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Re: [Elecraft] R: Re: K3S - K3 Noise Blanker and Noise Reductor

[Don Wilhelm]

Ian,

Your AGC SLP and AGC THR menu settings are contributing to the noise 
response of your K3S.

I recommend you increase the AGC THR setting and decrease the AGC SLP.
Look at my website www.w3fpr.com "Noisy K3" article.  It will give you 
guidelines for setting those AGC parameters to best deal with the 
ambient noise you have at your location.
Pay particular attention to the method of evaluating your changes. You 
must listen during pauses in a signal.  If you listen only to the noise, 
you will end up adjusting the wrong direction.


73,
Don W3FPR

On 10/13/2016 3:58 PM, glcazz...@alice.it wrote:


in the CONFIG MENU I have:
AGC DCY - nor
AGC HLD - 0.00
AGC PLS - nor
AGC SLP - 012
AGC THR - 005
AGC-F - 120
AGC-S - 020




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Re: [Elecraft] K3S QST Article

[Wes Stewart]

Hi Knut,

Yes, I get a notification about the digital issue, but I prefer to read the 
paper copy, so I wait.  It did come yesterday so I've seen it now.


Wes

On 10/13/2016 5:35 PM, ab2tc wrote:

Hi Wes,

You can read it online. I received an Email link from ARRL to my online
copy.

AB2TC - Knut




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Re: [Elecraft] Microphone

[Bill]

The point is: Using most any mic - from $10.99 to $500.00 - because it 
is all in the way you set up the K3(S).


Want a really super looking broadcast mic? Buy a $3 electret module and 
build a mic case to suit your visual dreams. Plastic, PVC, wood, resin, 
and IMAGINATION - and you rule!


Bill W2BLC
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Re: [Elecraft] Microphone

[Richard Lamont]

On 13/10/16 20:40, Arie Kleingeld PA3A wrote:

> As far as mic-audio is concerned: how much hi-fi can you put through a
> 2.5kHz bandwidth SSB signal?

Not much. But there's more to microphone quality than frequency response.

1. Plosives. Will the mic handle poppy 'p' sounds without overloading?

2. Directionality. Is it directional? If not, you'll get more shack
reverberation, fan noise and reflections from the desk (causing comb
filter notches in the response).

3. Proximity effect. Will the mic increase LF as you get closer to it?
If it's directional, yes it will, unless it's one of the Electro-Voice
Variable-D types or similar. Omnis don't have proximity effect.

4. Handling noise. If hand-held, how much unwanted noise is generated as
you move around?

5. Screening. Is it adequately screened? If not, it may be more prone to
RF feedback.


73,
Richard G4DYA
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Re: [Elecraft] Interlocking two K3

[Matthew Cook]

Aren't those just virtual widgets that you stitch together in a software
package drop some pins down and download to your FPGA ?

You'd have to be old enough to know they started as silicon, I'm sure I can
find the masks or some bare dies for those here at work (*wink*).

73

Matthew
VK5ZM

On 14 October 2016 at 07:41, Roger Dixon  wrote:

> Thanks for the comments.  I now have a prototype solution running with a
> 4027 and a 4528 !!
> 73
> Roger
>
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
> Edward
> R Cole
> Sent: 11 October 2016 05:50
> To: Elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Interlocking two K3
>
> The simple fix is to move the 470-ohm resistors to be inserted between
> pin-1
> and Pin-7.  The resistor is used to limit current draw when pin-7 is
> grounded (inhibiting Tx).  With pin-10 directly connected to pin-7, pin-7
> will go directly to low when pin-10 does.
>
> If you want a little more insurance that current goes the correct direction
> add a diode pointing toward pin-10 from pin-7.
>
> I am using inhibit with my station sequencer (except with the opposite
> logic: INH=HI):
> http://www.kl7uw.com/TX-INHIBIT.htm
> also added a little more band logic for use with transverters and disables
> inhibit with HF.
>
> 73, Ed - KL7UW
>
> -
> From: "Val" 
> To: 
> Subject: Re: [Elecraft] Interlocking two K3
> Message-ID: <835760C8560A48D18E811EB243F91E3E@OFFICE>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>  reply-type=original
>
> Charlie, how this could work after there is no way the TX Inh inputs to be
> pulled down?
>
> 73, Val LZ1VB
>
>  > Roger:
>  > Look at:
>  >
>  > http://www.kkn.net/~n6tv/SimpleElecraftK3SO2RLockoutCircuit.pdf
>  >
>  > I belive it's different than the one you described in your email.
>  > I've
>  > used this one successfully.
>  >
>  > 73 charlie, k1xx
>
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
>  "Kits made by KL7UW"
> Dubus Mag business:
>  dubus...@gmail.com
>
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