Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Igor Sokolov]

May I add that another good feature of a direct sampling SDR is low IMD 
in the passband. That is due to lack of crystal filter in the passband. 
The result is that that output audio is cleaner especially when there 
are several stations calling on the same frequency.


73, Igor UA9CDC

30.07.2017 21:46, Wayne Burdick пишет:

GaryK9GS  wrote:

Thanks for sending Wayne.   To take this discussion a step further,  is the 
Flex series of radios in the same category as the 7300?


Flex radios do use a direct-sampling architecture (with no roofing filters). 
The degree to which they’re subject to ADC over-range, and what they do about 
it in firmware, has been the subject of ongoing debate. It may be the case 
that, generally, the more you pay for a direct-sampling radio, the better the 
A-to-D converters, and the higher the ADC overrange threshold.

That said, when measured with preamp off, the Flex 6700 has about 7 dB less IMD 
dynamic range than the K3S (see note Y in Sherwood’s chart), and 20 dB less 
blocking dynamic range. Both are direct consequences of not having narrowband 
roofing filters.

On the other hand, the Flex radios have a very broad panadapter display for 
those who require it.

73,
Wayne
N6KR




73,
Gary K9GS
 Original message From: Wayne Burdick  Date: 
7/30/17  11:14 AM  (GMT-06:00) To: Elecraft Reflector  
Subject: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level
direct-sampling radios
Hi all,

Over the past two days I’ve been deluged with requests for our K3S vs. IC7300 
comparison chart. This stems from a posting that mentioned the latter rig, and 
my subsequent offer to send out the chart, which we normally use for in-house 
training purposes.

What’s become clear from all the questions and comments is that there’s a need 
for clarification on receiver architecture.

The K3S, an SDR/superhet hybrid, includes narrowband protection of its A-to-D 
converters in the form of roofing filters (crystal filters). This is 
fundamentally different from the approach taken by direct-sampling radios, 
which have only very broadband filtering ahead of their ADCs. Typically, 
front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be impacted 
by all strong signals in this range, alone and in summation.

When the ADC over-ranges in this “pure” SDR architecture, the radio usually 
reduces its gain automatically by either turning off preamps or adding 
attenuation. This increases the noise figure, often resulting in the loss of 
weak signals, both audibly and in the panadapter. Another word for it is 
“desense.” You might hear a pulsing sound as the noise floor goes up and down 
in response to a particular signal, or the sensitivity may degrade for many 
seconds at a time while the firmware waits for levels to drop at the input to 
the ADC.

Such over-ranging is almost unheard of in the K3S, for multiple reasons. First, 
we use very strong mixers and gain stages. Second, in many cases there’s no 
need to turn the preamp on at all. (Example: the K3S’s preamp-off sensitivity 
is typically -135 dB, while the preamp-off sensitivity on a typical 
direct-sampling SDR is -115 to -125 dB.) The third reason for the K3S’s 
strong-signal performance is its crystal roofing filters. These protect the ADC 
from not only wide-spaced signals, but also from signals very close by. As K3 
and K3S owners will attest, you can have a huge signal just a few hundred Hz 
away and not even know it’s there -- unless that station’s transmit phase noise 
is blanketing the band anyway. (There’s no defense against an unclean or clicky 
transmit signal.)

I’ve updated the referenced comparison chart to clarify this important 
difference. Our webmaster will put it up next week.

Meanwhile, I’ll continue to send it on request (email me directly). Feel free 
to share the information with anyone interested in the topic.

73,
Wayne
N6KR




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Re: [Elecraft] OT Yamaha CM-500 ear pads

[Rose]

Yup, just looked ... Amazon has several vendors offering the ear pads.

73

K0PP

On Jul 30, 2017 21:57, "GaryK9GS"  wrote:

> Bob, K4TAX, Isis probably right.  You could try getting a set of Koss SB40
> pads but it's probably not worth the trouble.
> https://www.koss.com/headphones/headsets/sb40
>
>
> 73,
> Gary K9GS
>  Original message From: Bob McGraw K4TAX <
> rmcg...@blomand.net> Date: 7/30/17  10:24 PM  (GMT-06:00) To:
> elecraft@mailman.qth.net Subject: Re: [Elecraft] OT Yamaha CM-500 ear pads
> For the price of the headset...order a new
> one...trash the old one.I'd expect cost of the ear pads plus
> shipping is ... 1/2 the cost of a new headset.
>
> 73
>
> Bob, K4TAX
>
>
> On 7/30/2017 10:18 PM, George Winship, NC5G wrote:
> > Has anyone found a suitable replacement ear pad. Mine are worn out.
> Otherwise
> > the headset is good and hate to discard it. Did not find anything in the
> > archives.
> >
> > 73, George NC5G
> >
> >
> >
> > --
> > View this message in context: http://elecraft.365791.n2.
> nabble.com/OT-Yamaha-CM-500-ear-pads-tp7632896.html
> > Sent from the Elecraft mailing list archive at Nabble.com.
> > __
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Re: [Elecraft] OT Yamaha CM-500 ear pads

[Ken G Kopp]

Might try musical instrument vendors.  Good sources for foot switches, etc.

Maybe an inquiry on Amazon would turn them up.  It has "everything"! (:-))

73

K0PP

On Jul 30, 2017 21:18, "George Winship, NC5G"  wrote:

> Has anyone found a suitable replacement ear pad. Mine are worn out.
> Otherwise
> the headset is good and hate to discard it. Did not find anything in the
> archives.
>
> 73, George NC5G
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.
> nabble.com/OT-Yamaha-CM-500-ear-pads-tp7632896.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> __
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Re: [Elecraft] OT Yamaha CM-500 ear pads

[Josh Fiden]

If any of these Koss options will fit, they sell them for $5 and have a 
free ground shipping option.


https://www.koss.com/accessories/cushions

73,
Josh W6XU

On 7/30/2017 8:55 PM, GaryK9GS wrote:

Bob, K4TAX, Isis probably right.  You could try getting a set of Koss SB40 pads 
but it's probably not worth the trouble.
https://www.koss.com/headphones/headsets/sb40




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Re: [Elecraft] OT Yamaha CM-500 ear pads

[GaryK9GS]

Bob, K4TAX, Isis probably right.  You could try getting a set of Koss SB40 pads 
but it's probably not worth the trouble.
https://www.koss.com/headphones/headsets/sb40


73,
Gary K9GS
 Original message From: Bob McGraw K4TAX  
Date: 7/30/17  10:24 PM  (GMT-06:00) To: elecraft@mailman.qth.net Subject: Re: 
[Elecraft] OT Yamaha CM-500 ear pads 
For the price of the headset...order a new 
one...trash the old one.    I'd expect cost of the ear pads plus 
shipping is ... 1/2 the cost of a new headset.

73

Bob, K4TAX


On 7/30/2017 10:18 PM, George Winship, NC5G wrote:
> Has anyone found a suitable replacement ear pad. Mine are worn out. Otherwise
> the headset is good and hate to discard it. Did not find anything in the
> archives.
>
> 73, George NC5G
>
>
>
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/OT-Yamaha-CM-500-ear-pads-tp7632896.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> __
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> Message delivered to rmcg...@blomand.net
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Re: [Elecraft] OT Yamaha CM-500 ear pads

[Bob McGraw K4TAX]

For the price of the headset...order a new 
one...trash the old one.I'd expect cost of the ear pads plus 
shipping is ... 1/2 the cost of a new headset.


73

Bob, K4TAX


On 7/30/2017 10:18 PM, George Winship, NC5G wrote:

Has anyone found a suitable replacement ear pad. Mine are worn out. Otherwise
the headset is good and hate to discard it. Did not find anything in the
archives.

73, George NC5G



--
View this message in context: 
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Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] OT Yamaha CM-500 ear pads

[George Winship, NC5G]

Has anyone found a suitable replacement ear pad. Mine are worn out. Otherwise
the headset is good and hate to discard it. Did not find anything in the
archives.

73, George NC5G



--
View this message in context: 
http://elecraft.365791.n2.nabble.com/OT-Yamaha-CM-500-ear-pads-tp7632896.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] How to keep track of grid squares logged?

[Jim Brown]

This is MONDO COOL, Jeff!  Thanks!

Feature request -- how about showing only grids that are still needed?

73, Jim K9YC

On 7/30/2017 1:21 PM, Jeffrey Otterson wrote:

I built this little toy to map my confirmed squares:

 https://www.n1kdo.com/lotw-gridmapper/6mGrids.html



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Re: [Elecraft] KAT-500 brain trust question

[Don Wilhelm]

Chris,

There is an alternative that I have suggested many times for the KAT100 
(and KAT2) that should work with the KAT500 as well.
Tune the ATU into a dummy load for those bands and antennas you want to 
use with the SteppIR, and then connect the real antenna. Make certain 
the KAT500 is set to MAN so it does not auto-tune.
It may or may not be a true bypass, the the ATU L/C combinations should 
be set to work into a 50 ohm load.  Then when you tune the SteppIR, it 
should be matched after its tuning process completes.


73,
Don W3FPR

On 7/30/2017 6:39 PM, Chris Tate - N6WM wrote:

Don thanks for this, indeed this is the current solution.  Although it is 
rather obscure as far as indicators on the front panel.

I would like to convert this to a feature request, as It would be nice if the 
firmware supported, and there was another matrix in the KAT500 Utility that 
would permit a hard bypass with indicator on a per band basis.  Gives that warm 
fuzzy its doing exactly what you want..

E.g. qsy to 20m.. bypass light comes on..

Chris
N6WM

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chris Tate - N6WM
Sent: Sunday, July 30, 2017 1:31 PM
To: donw...@embarqmail.com
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT-500 brain trust question

Thanks Don I will take a look

Thanks
~C.


On Jul 30, 2017, at 1:29 PM, Don Wilhelm  wrote:

Chris,

Yes, see page 17 of the KAT500 manual.  Easier for you to read it than for me 
to try to explain all of it.

73,
Don W3FPR


On 7/30/2017 4:01 PM, Chris Tate - N6WM wrote:
Is there a way to put the KAT500 in bypass when on certain bands?  Use case is 
SteppIR on AN1 and auto tracking, and HQ antenna on ANT2 that requires tune 
adjustment and memories.  KAT500 is getting band/QRG telemetry via cat from 
radio.

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Re: [Elecraft] Maintaining Sanity with Filters

[Bob Steding]

And here I thought this thread was about Roofing *filters and their
potential to harm a ham's mental stability.*

On Sun, Jul 30, 2017 at 6:45 PM, Drew AF2Z  wrote:

> It's quite easy to scan the subject lines of individual emails, sorted by
> subject in a mail reader, and instantly deleted en masse if need be, rather
> than plowing through a serial listing of random topics in a digest; "speed
> reading" or no.
>
> Also, with the tap of a key one can save the occasional interesting post
> for future reference. Can't do that in a digest.
>
> After all these years on the internet the only slight irritation I have
> with email lists are subject lines such as "Question" or "How about this",
> etc. I assume that when someone hasn't put any thought into the subject
> line the rest of the post will not be worth reading. Such non-specific
> topics usually get deleted without further inspection. I don't mind
> off-topic posts at all if the subject line is descriptive of the content.
> Most list traffic is "off topic" to my narrow individual interests.
>
> I enjoy quickly sorting the wheat from the chaff with a good mail reader.
> It's the email equivalent of a good HF receiver. Both deal with retrieving
> information from the noisy channel. Using a mail reader effectively does
> require touch typing ability and familiarity with the shortcut keys. If I
> had to do it by mouse clicking my way through each individual message in
> turn, that would indeed be agonizing.
>
> The only reason I read the current thread is because I thought the topic
> was referring to receiver filters, not email filters. But maybe the above
> will help.
>
>
> 73,
> Drew
> AF2Z
>
>
>
>
>
> On 07/30/17 16:41, Dauer, Edward wrote:
>
>> At one point during my time teaching law school some of my students
>> suggested that drafting regulations when market forces are arrayed against
>> you is like playing Whack-a-Mole.  Never having heard of it before, I
>> looked into it.  Apparently Whack-a-Mole is generic for machines found in
>> bars where graduate students go, in which the player whacks a plastic mole
>> with a rubber mallet only to see another pop up from some other spot on the
>> playing field.  I didn’t see much point in the game, then or now, other
>> than as an outlet for educational frustration or just excess testosterone.
>> But the simile was apt.
>>
>> Can a G-mail or any other filter really identify subjects whose name
>> changes from time to time – notice that I changed the title of this thread
>> by dropping just one word.  Or another example – in how many ways would I
>> have to type title descriptions into a filter that would make it block
>> posts that try to instruct Elecraft how to run its business?  Whack-a-Mole,
>> indeed.   Conversely, are filters smart enough to allow through those posts
>> that use the same name but whose contents have migrated to something
>> actually worth reading?  My favorite example of that was an excruciatingly
>> long thread a couple of years ago about using KX3s for communications on
>> motorcycle club rides.  I couldn’t care less about the nominal subject –
>> but I did learn a good deal about portable use of my KX3.   Ditto more
>> recently for finding the right grounding point on a Chevy Silverado.  Gems
>> of all sorts in that one.
>>
>> My solution is to take the reflector not in individual e-mails but in the
>> once or twice daily collected format, whatever that’s called, then do a
>> quick speed-read to ID what interests me. I don’t even bother with the
>> delete key.  For extreme cases the nudging of a human moderator usually
>> helps a lot.  Works great.
>>
>> Maybe I am just not yet ready to trust AI to replicate my judgment.  Am I
>> wrong in that?  After all, Whack-a-Mole is a good metaphor for the habit of
>> being a Luddite too.
>>
>> Ted, KN1CBR
>>
>>
>>  Message: 1
>>  Date: Sat, 29 Jul 2017 17:55:46 -0400
>>  From: Kevin der Kinderen 
>>  To: Elecraft Reflector Reflector 
>>  Subject: [Elecraft] Maintaining Sanity with Gmail Filters
>>  Message-ID:
>> > gmail.com>
>>  Content-Type: text/plain; charset="UTF-8"
>>   For those with Gmail, the only way I have found to reduce the
>> amount of
>>  reflector emails that don't interest me is to set up a filter.
>>   The way I do this is to first do a search on the subject I'm no
>> longer
>>  interested in: "K3S Package Discounts" for example. Then, beside the
>> search
>>  field there's a little arrow you can click. The little popup has a
>> "Create
>>  filter with this search" link at the bottom. Click this. The next
>> popup
>>  lets you decide what to do with current and future emails that meet
>> the
>>  criteria. I select mark as read and delete it. I wish it could do
>> more with
>>  the emails but that's another matter. There's a 

[Elecraft] XG2 Signal Generator

[Michael Raskin]

XG2 - Signal Generator – brand-new, unassembled kit –Buy it from Elecraft for 
$89.95, or buy mine for $60 which includes free shipping CONUS.

All the other listed mini-modules have sold.
PayPal or personal check.  Mike, W4UM
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Re: [Elecraft] How to keep track of grid squares logged?

[David Anderson via Elecraft]

I was going to suggest VQLOG by Gabriel EA6VQ, the same ham that produces the 
wonderful DXMaps spotting website.  

https://www.dxmaps.com/spots/mapg.php

https://www.dxmaps.com/vqlog.html

I have used VQLOG for all my VHF and UHF contacts and it makes keeping track of 
countries, grid squares, awards and so on very easy.   

If you are more than just a casual VHF guy then having a logging program like 
this is needed.

73 from David GM4JJJ

> On 30 Jul 2017, at 22:37, Wayne Burdick  wrote:
> 
> This is just what I was looking for, Frank. 
> 
> Thanks, everyone, for all the other suggestions as well.
> 
> 73,
> Wayne
> N6KR
> 
> 
>> On Jul 30, 2017, at 12:59 PM, Frank Westphal  wrote:
>> 
>> Wayne,
>> 
>> Link to FFMA Grid Tracker spreadsheet developed by NZ3M.
>> 
>> http://www.nz3m.com/FFMA.html
>> 
>> Frank
>> 
>> Message: 16
>> Date: Sun, 30 Jul 2017 11:12:28 -0700
>> From: Wayne Burdick
>> To: Elecraft Reflector
>> Subject: [Elecraft] How to keep track of grid squares logged?
>> Message-ID:<6417183d-ed00-4d7b-9751-60bc73cf5...@elecraft.com>
>> Content-Type: text/plain; charset=utf-8
>> 
>> Hi all,
>> 
>> On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
>> tool or spreadsheet available somewhere that allows you to conveniently keep 
>> track of which ones you?ve worked?
>> 
>> Thanks,
>> Wayne
>> N6KR
> 
> 
> 
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Re: [Elecraft] How to keep track of grid squares logged?

[Ralph Parker]

In addition to DX Atlas and Logger32, I use the paper ARRL grid square 
map, overlaid with directional lines every 30 degrees true, for quick 
antenna pointing. You'll need that when you get your 7el Yagi up.


Yellow highlight for worked, green highlight for confirmed.

After a while, your skip zones become evident.

And it works when the computer is off :-)

VE7XF

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Re: [Elecraft] Maintaining Sanity with Filters

[Drew AF2Z]

It's quite easy to scan the subject lines of individual emails, sorted 
by subject in a mail reader, and instantly deleted en masse if need be, 
rather than plowing through a serial listing of random topics in a 
digest; "speed reading" or no.


Also, with the tap of a key one can save the occasional interesting post 
for future reference. Can't do that in a digest.


After all these years on the internet the only slight irritation I have 
with email lists are subject lines such as "Question" or "How about 
this", etc. I assume that when someone hasn't put any thought into the 
subject line the rest of the post will not be worth reading. Such 
non-specific topics usually get deleted without further inspection. I 
don't mind off-topic posts at all if the subject line is descriptive of 
the content. Most list traffic is "off topic" to my narrow individual 
interests.


I enjoy quickly sorting the wheat from the chaff with a good mail 
reader. It's the email equivalent of a good HF receiver. Both deal with 
retrieving information from the noisy channel. Using a mail reader 
effectively does require touch typing ability and familiarity with the 
shortcut keys. If I had to do it by mouse clicking my way through each 
individual message in turn, that would indeed be agonizing.


The only reason I read the current thread is because I thought the topic 
was referring to receiver filters, not email filters. But maybe the 
above will help.



73,
Drew
AF2Z




On 07/30/17 16:41, Dauer, Edward wrote:

At one point during my time teaching law school some of my students suggested 
that drafting regulations when market forces are arrayed against you is like 
playing Whack-a-Mole.  Never having heard of it before, I looked into it.  
Apparently Whack-a-Mole is generic for machines found in bars where graduate 
students go, in which the player whacks a plastic mole with a rubber mallet 
only to see another pop up from some other spot on the playing field.  I didn’t 
see much point in the game, then or now, other than as an outlet for 
educational frustration or just excess testosterone.  But the simile was apt.

Can a G-mail or any other filter really identify subjects whose name changes 
from time to time – notice that I changed the title of this thread by dropping 
just one word.  Or another example – in how many ways would I have to type 
title descriptions into a filter that would make it block posts that try to 
instruct Elecraft how to run its business?  Whack-a-Mole, indeed.   Conversely, 
are filters smart enough to allow through those posts that use the same name 
but whose contents have migrated to something actually worth reading?  My 
favorite example of that was an excruciatingly long thread a couple of years 
ago about using KX3s for communications on motorcycle club rides.  I couldn’t 
care less about the nominal subject – but I did learn a good deal about 
portable use of my KX3.   Ditto more recently for finding the right grounding 
point on a Chevy Silverado.  Gems of all sorts in that one.

My solution is to take the reflector not in individual e-mails but in the once 
or twice daily collected format, whatever that’s called, then do a quick 
speed-read to ID what interests me. I don’t even bother with the delete key.  
For extreme cases the nudging of a human moderator usually helps a lot.  Works 
great.

Maybe I am just not yet ready to trust AI to replicate my judgment.  Am I wrong 
in that?  After all, Whack-a-Mole is a good metaphor for the habit of being a 
Luddite too.

Ted, KN1CBR


 Message: 1
 Date: Sat, 29 Jul 2017 17:55:46 -0400
 From: Kevin der Kinderen 
 To: Elecraft Reflector Reflector 
 Subject: [Elecraft] Maintaining Sanity with Gmail Filters
 Message-ID:

 Content-Type: text/plain; charset="UTF-8"
 
 For those with Gmail, the only way I have found to reduce the amount of

 reflector emails that don't interest me is to set up a filter.
 
 The way I do this is to first do a search on the subject I'm no longer

 interested in: "K3S Package Discounts" for example. Then, beside the search
 field there's a little arrow you can click. The little popup has a "Create
 filter with this search" link at the bottom. Click this. The next popup
 lets you decide what to do with current and future emails that meet the
 criteria. I select mark as read and delete it. I wish it could do more with
 the emails but that's another matter. There's a Learn More link if you get
 stuck.
 
 You can filter on many other search criteria such as sender. That comes in

 very handy.
 
 It almost always works. Sometimes the subject changes a little and usually

 the digests where the subject is not changed make it through. I haven't
 found a better way but I'm open to suggestions. Unsubscribing 

Re: [Elecraft] KAT-500 brain trust question

[Chris Tate - N6WM]

Don thanks for this, indeed this is the current solution.  Although it is 
rather obscure as far as indicators on the front panel.

I would like to convert this to a feature request, as It would be nice if the 
firmware supported, and there was another matrix in the KAT500 Utility that 
would permit a hard bypass with indicator on a per band basis.  Gives that warm 
fuzzy its doing exactly what you want..

E.g. qsy to 20m.. bypass light comes on..

Chris
N6WM

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chris Tate - N6WM
Sent: Sunday, July 30, 2017 1:31 PM
To: donw...@embarqmail.com
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT-500 brain trust question

Thanks Don I will take a look

Thanks
~C.

> On Jul 30, 2017, at 1:29 PM, Don Wilhelm  wrote:
> 
> Chris,
> 
> Yes, see page 17 of the KAT500 manual.  Easier for you to read it than for me 
> to try to explain all of it.
> 
> 73,
> Don W3FPR
> 
>> On 7/30/2017 4:01 PM, Chris Tate - N6WM wrote:
>> Is there a way to put the KAT500 in bypass when on certain bands?  Use case 
>> is SteppIR on AN1 and auto tracking, and HQ antenna on ANT2 that requires 
>> tune adjustment and memories.  KAT500 is getting band/QRG telemetry via cat 
>> from radio.
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Re: [Elecraft] How to keep track of grid squares logged?

[Wayne Burdick]

Frank,

I downloaded this great tracking tool and filled in my 10 grid squares (so 
far). Long way to 488

I’m replacing my 6 meter ham-stick dipole with a 2-element Moxon next week :)

Wayne
N6KR


> On Jul 30, 2017, at 12:59 PM, Frank Westphal  wrote:
> 
> Wayne,
> 
> Link to FFMA Grid Tracker spreadsheet developed by NZ3M.
> 
> http://www.nz3m.com/FFMA.html
> 
> Frank
> 
> 


> 
> Hi all,
> 
> On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
> tool or spreadsheet available somewhere that allows you to conveniently keep 
> track of which ones you?ve worked?
> 
> Thanks,
> Wayne
> N6KR



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Re: [Elecraft] How to keep track of grid squares logged?

[Wayne Burdick]

This is just what I was looking for, Frank. 

Thanks, everyone, for all the other suggestions as well.

73,
Wayne
N6KR


> On Jul 30, 2017, at 12:59 PM, Frank Westphal  wrote:
> 
> Wayne,
> 
> Link to FFMA Grid Tracker spreadsheet developed by NZ3M.
> 
> http://www.nz3m.com/FFMA.html
> 
> Frank
> 
> Message: 16
> Date: Sun, 30 Jul 2017 11:12:28 -0700
> From: Wayne Burdick
> To: Elecraft Reflector
> Subject: [Elecraft] How to keep track of grid squares logged?
> Message-ID:<6417183d-ed00-4d7b-9751-60bc73cf5...@elecraft.com>
> Content-Type: text/plain; charset=utf-8
> 
> Hi all,
> 
> On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
> tool or spreadsheet available somewhere that allows you to conveniently keep 
> track of which ones you?ve worked?
> 
> Thanks,
> Wayne
> N6KR



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Re: [Elecraft] [K3S] K3S High SWR Shutdown on FT8?

[Charles]

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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Don Wilhelm]

Michael,

In general, digital wattmeters have the same accuracy at any point on 
the scale - unlike analog wattmeters for which the accuracy is stated as 
a percentage of the full scale reading.  On a 20 watt scale, a 25% error 
would be up to 4 watts!


You might want to look at the specs for that 440 MHz transmitter as 
well.  If it 2.6 dB or so, getting 2.8 watts out for a 5 watt setting 
may be what you can expect.


73,
Don W3FPR

On 7/30/2017 4:59 PM, Michael via Elecraft wrote:

OK so I am trying to measure around 5 Watts or so on the W2's 20 Watt
scale.  The spec's for the W2 directional couplers are listed at 0.5 dB
accuracy.  Is this anywhere or just at full scale? How much could it  be off at
only 25% of full scale?
  
Trying to decide if the 2.8 Watts I am reading at 440 MHz on high power is

too low with a spec of 5 Watts output!  If it is I can send it back to the
place of purchase to be checked and exchanged if necessary.
  
There seems to be no problem on the 2 Meter band at only 25 % of scale (5

Watts) readingjust on 440.
  
Michael

n2zdb
  
  
  
  
  
  
In a message dated 07/30/2017 12:36:49 P.M. Eastern Daylight Time,

elecraftcov...@gmail.com writes:

  



The accuracy of a Bird Model 43 is +/- 5% of full scale.  The meter  scale
is not
linear and produces the best read accuracy in the bottom portion of the
meter's
scale.


There are numerous watt meters on the market today that are more  accurate.
  



FWIW  73!


Ken Kopp - K0PP


--
On Sun, Jul 30, 2017 at 9:23 AM, Michael Walker 
wrote:

The  only way to get the answer you wish is to compare it to a bench
standard  like a bird watt meter.

Beyond that you are just guessing.   Sorry

Mike va3mw


On Sun, Jul 30, 2017 at 11:18 AM,  Michael via Elecraft <
elecraft@mailman.qth.net>  wrote:


Measurement is in analog mode.should have made that  clear or not even
mentioned a digital radio!

  Michael





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Re: [Elecraft] Freq. offset?? -- K3

[Nr4c]

Calibrate the P3 

Sent from my iPhone
...nr4c. bill


> On Jul 29, 2017, at 10:51 PM, Bob McGraw K4TAX  wrote:
> 
> Also check the settings of your side tone frequency.  If it is different than 
> you tune, there will be an error.  
> 
> Bob, K4TAX
> 
> 
> Sent from my iPhone
> 
>> On Jul 29, 2017, at 9:32 PM, Ian Kahn  wrote:
>> 
>> Check whether you may have accidentally set the RIT (Receive Incremental
>> Tuning) or XIT (Xmit Incremental Tuning). That happens to me sometimes.
>> 
>> 73 de,
>> 
>> Ian, KM4IK
>> 
>>> On Jul 29, 2017 9:14 PM, "Gene O"  wrote:
>>> 
>>> Just discovered when trying to copy a strong CW signal the frequency seems
>>> to offset.  I can see the signal on my P3 at say 7024.000 but I hear the
>>> station the strongest at 7025.000. This occurs with either my 1.0khz or
>>> 400hz filter.
>>> 
>>> Is there some frequency offset that I may set in error?
>>> 
>>> Thanks. Gene, W2BXR
>>> __
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>>> Message delivered to km4ik@gmail.com
>>> 
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>> 
> 
> 
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Re: [Elecraft] Maintaining Sanity with Filters

[Lynn W. Taylor, WB6UUT]

There is a technology that will sort mail from sources like this list, 
sort it accurately, and is easy to maintain.


The technology is called Naive Bayesian Filtering.  For 100 messages or 
so, you classify incoming mail into whatever "bins" you want.


Once that's done, you check the bins once in a while, and only 
reclassify the errors.


If you're really annoyed by off-topic mail, it'll do an awesome job of 
filtering with very little work on your part (and not much thought, past 
setting up the initial "bins.")




I've used it, it works extremely well.  In IMAP-mode, it could even work 
on web-based systems like GMail.


Since I'm not annoyed by off-topic mail (and often learn about things 
I'd never considered) I just use the delete key.


73 -- Lynn

On 7/30/2017 1:41 PM, Dauer, Edward wrote:

Can a G-mail or any other filter really identify subjects whose name changes 
from time to time – notice that I changed the title of this thread by dropping 
just one word.

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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Michael via Elecraft]

OK so I am trying to measure around 5 Watts or so on the W2's 20 Watt  
scale.  The spec's for the W2 directional couplers are listed at 0.5 dB  
accuracy.  Is this anywhere or just at full scale? How much could it  be off at 
only 25% of full scale?
 
Trying to decide if the 2.8 Watts I am reading at 440 MHz on high power is  
too low with a spec of 5 Watts output!  If it is I can send it back to the  
place of purchase to be checked and exchanged if necessary.
 
There seems to be no problem on the 2 Meter band at only 25 % of scale (5  
Watts) readingjust on 440.
 
Michael
n2zdb
 
 
 
 
 
 
In a message dated 07/30/2017 12:36:49 P.M. Eastern Daylight Time,  
elecraftcov...@gmail.com writes:

 


The accuracy of a Bird Model 43 is +/- 5% of full scale.  The meter  scale 
is not
linear and produces the best read accuracy in the bottom portion of the  
meter's 
scale.  


There are numerous watt meters on the market today that are more  accurate. 
 


FWIW  73!


Ken Kopp - K0PP


--
On Sun, Jul 30, 2017 at 9:23 AM, Michael Walker  
wrote:

The  only way to get the answer you wish is to compare it to a bench
standard  like a bird watt meter.

Beyond that you are just guessing.   Sorry

Mike va3mw


On Sun, Jul 30, 2017 at 11:18 AM,  Michael via Elecraft <
elecraft@mailman.qth.net>  wrote:

> Measurement is in analog mode.should have made that  clear or not even
> mentioned a digital radio!
>
>  Michael




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[Elecraft] Elecraft Mini-Modules For Sale – Price have been reduced

[Michael Raskin]

Elecraft Mini-Modules For Sale – Price have been reduced for these remaining 
Mini-Modules:

The following are completely built, tested, and in excellent working condition:

1)BL1 - 150 Watt Wide-Band Balun (4:1) - $14.

2)DL1 - 20W Dummy Load with RF Detector mounted inside W8FGU Plexiglas 
Enclosure - $22.

3)XG2 - Signal Generator mounted inside W8FGU Plexiglas Enclosure with 
Power Switch - $75.

The following are unbuilt, brand-new kits:

1)2T-Gen – 2-Tone Test Oscillator (700Hz, 1900Hz) mounted inside W8FGU 
Plexiglas Enclosure with Power Switch - $50.

2)XG2 - Signal Generator - $60.



Shipping extra.  PayPal or personal check.  Mike, W4UM
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[Elecraft] Maintaining Sanity with Filters

[Dauer, Edward]

At one point during my time teaching law school some of my students suggested 
that drafting regulations when market forces are arrayed against you is like 
playing Whack-a-Mole.  Never having heard of it before, I looked into it.  
Apparently Whack-a-Mole is generic for machines found in bars where graduate 
students go, in which the player whacks a plastic mole with a rubber mallet 
only to see another pop up from some other spot on the playing field.  I didn’t 
see much point in the game, then or now, other than as an outlet for 
educational frustration or just excess testosterone.  But the simile was apt.

Can a G-mail or any other filter really identify subjects whose name changes 
from time to time – notice that I changed the title of this thread by dropping 
just one word.  Or another example – in how many ways would I have to type 
title descriptions into a filter that would make it block posts that try to 
instruct Elecraft how to run its business?  Whack-a-Mole, indeed.   Conversely, 
are filters smart enough to allow through those posts that use the same name 
but whose contents have migrated to something actually worth reading?  My 
favorite example of that was an excruciatingly long thread a couple of years 
ago about using KX3s for communications on motorcycle club rides.  I couldn’t 
care less about the nominal subject – but I did learn a good deal about 
portable use of my KX3.   Ditto more recently for finding the right grounding 
point on a Chevy Silverado.  Gems of all sorts in that one.

My solution is to take the reflector not in individual e-mails but in the once 
or twice daily collected format, whatever that’s called, then do a quick 
speed-read to ID what interests me. I don’t even bother with the delete key.  
For extreme cases the nudging of a human moderator usually helps a lot.  Works 
great.  

Maybe I am just not yet ready to trust AI to replicate my judgment.  Am I wrong 
in that?  After all, Whack-a-Mole is a good metaphor for the habit of being a 
Luddite too.

Ted, KN1CBR


Message: 1
Date: Sat, 29 Jul 2017 17:55:46 -0400
From: Kevin der Kinderen 
To: Elecraft Reflector Reflector 
Subject: [Elecraft] Maintaining Sanity with Gmail Filters
Message-ID:

Content-Type: text/plain; charset="UTF-8"

For those with Gmail, the only way I have found to reduce the amount of
reflector emails that don't interest me is to set up a filter.

The way I do this is to first do a search on the subject I'm no longer
interested in: "K3S Package Discounts" for example. Then, beside the search
field there's a little arrow you can click. The little popup has a "Create
filter with this search" link at the bottom. Click this. The next popup
lets you decide what to do with current and future emails that meet the
criteria. I select mark as read and delete it. I wish it could do more with
the emails but that's another matter. There's a Learn More link if you get
stuck.

You can filter on many other search criteria such as sender. That comes in
very handy.

It almost always works. Sometimes the subject changes a little and usually
the digests where the subject is not changed make it through. I haven't
found a better way but I'm open to suggestions. Unsubscribing means I lose
out on some very relevant and otherwise interesting topics. Maybe another
Elecraft list called Elecraft-BS or something?

Hope some find this helpful. It does reduce the inane conversations that
drag on for hours and days. You may be able to test it with the subject of
this post. It is a perfect example.

73,
Kev K4VD
 

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Re: [Elecraft] KAT-500 brain trust question

[Chris Tate - N6WM]

Thanks Don I will take a look

Thanks
~C.

> On Jul 30, 2017, at 1:29 PM, Don Wilhelm  wrote:
> 
> Chris,
> 
> Yes, see page 17 of the KAT500 manual.  Easier for you to read it than for me 
> to try to explain all of it.
> 
> 73,
> Don W3FPR
> 
>> On 7/30/2017 4:01 PM, Chris Tate - N6WM wrote:
>> Is there a way to put the KAT500 in bypass when on certain bands?  Use case 
>> is SteppIR on AN1 and auto tracking, and HQ antenna on ANT2 that requires 
>> tune adjustment and memories.  KAT500 is getting band/QRG telemetry via cat 
>> from radio.
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Re: [Elecraft] KAT-500 brain trust question

[Don Wilhelm]

Chris,

Yes, see page 17 of the KAT500 manual.  Easier for you to read it than 
for me to try to explain all of it.


73,
Don W3FPR

On 7/30/2017 4:01 PM, Chris Tate - N6WM wrote:

Is there a way to put the KAT500 in bypass when on certain bands?  Use case is 
SteppIR on AN1 and auto tracking, and HQ antenna on ANT2 that requires tune 
adjustment and memories.  KAT500 is getting band/QRG telemetry via cat from 
radio.

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Re: [Elecraft] How to keep track of grid squares logged?

[Jeffrey Otterson]

Howdy,

I'm using DxLab to log everything, including the grid square, and then
submitting to Logbook of The World for confirmation.  "Worked" does not
mean much to me; what I am interested in is "confirmed."

I built this little toy to map my confirmed squares:

https://www.n1kdo.com/lotw-gridmapper/6mGrids.html

The "toy" sucks down a ADIF file of confirmed 6m contacts from LoTW and
then plots them on Google Maps.  There is no reason why the toy should not
be able to ingest any ADIF file and plot the grids.  The code is all
javascript/css/html and there is a link to the sources on GitHub at the
bottom of the page.

Wayne, I am glad to hear you have discovered the joys of the Magic Band!

73

Jeff n1kdo









> From: Wayne Burdick 
> To: Elecraft Reflector 
> Cc:
> Bcc:
> Date: Sun, 30 Jul 2017 11:12:28 -0700
> Subject: [Elecraft] How to keep track of grid squares logged?
> Hi all,
> On 6 m, everyone uses grid squares when reporting their QTH. Is there a
> web tool or spreadsheet available somewhere that allows you to conveniently
> keep track of which ones you’ve worked?
> Thanks,
> Wayne
> N6KR
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[Elecraft] KAT-500 brain trust question

[Chris Tate - N6WM]

Is there a way to put the KAT500 in bypass when on certain bands?  Use case is 
SteppIR on AN1 and auto tracking, and HQ antenna on ANT2 that requires tune 
adjustment and memories.  KAT500 is getting band/QRG telemetry via cat from 
radio.

Thanks in advance..

Chris
N6WM
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[Elecraft] How to keep track of grid squares logged?

[Frank Westphal]

Wayne,

Link to FFMA Grid Tracker spreadsheet developed by NZ3M.

http://www.nz3m.com/FFMA.html

Frank

Message: 16
Date: Sun, 30 Jul 2017 11:12:28 -0700
From: Wayne Burdick
To: Elecraft Reflector
Subject: [Elecraft] How to keep track of grid squares logged?
Message-ID:<6417183d-ed00-4d7b-9751-60bc73cf5...@elecraft.com>
Content-Type: text/plain; charset=utf-8

Hi all,

On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
tool or spreadsheet available somewhere that allows you to conveniently keep 
track of which ones you?ve worked?

Thanks,
Wayne
N6KR

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Re: [Elecraft] How to keep track of grid squares logged?

[Walter Underwood]

On the Mac, RUMlogNG (free) tracks grid squares. Use JT-Bridge to link it to 
WSJT-X.

wunder
K6WRU
Walter Underwood
Radio Scouting Chair, Pacific Skyline Council
http://observer.wunderwood.org/ (my blog)

> On Jul 30, 2017, at 12:01 PM, Jim Brown  wrote:
> 
> On 7/30/2017 11:30 AM, Richard Lamont wrote:
>> I just used a paper map and a highlight marker. This worked infallibly
>> right up to the senior moment when I put the map in the shredder.
> 
> I do about the same, but haven't shredded it. Yet. :)  I make a single 
> diagonal mark when I work the grid, and make it an X when it's confirmed.
> 
> As of last night, I've worked 130 grids this season, and I just worked a few 
> more this morning. This map is great for showing 6M activity -- it shows 
> spots for the last 60 minutes. Clicking on MUF ES will show locations of 
> active Es regions.
> 
> http://www.dxmaps.com/spots/mapg.php?Lan==50==NA==ING2=
> 
> 73, Jim K9YC
> 
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[Elecraft] Freq. offset?? -- K3

[Gene O]

I believe I solved the problem.  It seems in the P3 menu I somehow set 
the "Ref Cal" value to 700. Perhaps I thought it should be the same as 
the pitch???  (don't know what the hec I was thinking).


In any event I changed this to zero and I am now able to tune to a 
signal with the K3 and the cursor of the P3 centers at the same 
frequency.  Also now able to tap marker "A", move it to a signal that 
came up on the P3, tap the knob and the K3 move over to the same signal.


Life is good again.

Thank you all who responded!

Gene, W2BXR

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Re: [Elecraft] How to keep track of grid squares logged?

[Tom]

You can use google earth with this:

http://www.fsdt.fi/freeware/grid/



-Original Message- 
From: Wayne Burdick

Sent: Sunday, July 30, 2017 2:12 PM
To: Elecraft Reflector
Subject: [Elecraft] How to keep track of grid squares logged?

Hi all,

On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
tool or spreadsheet available somewhere that allows you to conveniently keep 
track of which ones you’ve worked?


Thanks,
Wayne
N6KR

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---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

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Re: [Elecraft] How to keep track of grid squares logged?

[Jim Brown]

On 7/30/2017 11:30 AM, Richard Lamont wrote:

I just used a paper map and a highlight marker. This worked infallibly
right up to the senior moment when I put the map in the shredder.


I do about the same, but haven't shredded it. Yet. :)  I make a single 
diagonal mark when I work the grid, and make it an X when it's confirmed.


As of last night, I've worked 130 grids this season, and I just worked a 
few more this morning. This map is great for showing 6M activity -- it 
shows spots for the last 60 minutes. Clicking on MUF ES will show 
locations of active Es regions.


http://www.dxmaps.com/spots/mapg.php?Lan==50==NA==ING2=

73, Jim K9YC

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Re: [Elecraft] How to keep track of grid squares logged?

[dgb]

I use a program

http://ve2zaz.net/WorkedGrids/WorkedGrids.htm

73 Dwight NS9I


On 7/30/2017 1:12 PM, Wayne Burdick wrote:

Hi all,

On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
tool or spreadsheet available somewhere that allows you to conveniently keep 
track of which ones you’ve worked?

Thanks,
Wayne
N6KR

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[Elecraft] Fwd: How to keep track of grid squares logged?

[Tom-KQ5S]

Meant to send this to the group.


73,
Tom - KQ5S

-- Forwarded message --
From: Tom-KQ5S 
Date: Sun, Jul 30, 2017 at 1:47 PM
Subject: Re: [Elecraft] How to keep track of grid squares logged?
To: Wayne Burdick 


DXKeeper, the logging component of DXLab, allows realtime tracking of VUCC.

http://www.dxlabsuite.com/dxlabwiki/VUCCAwardTracking


73,
Tom - KQ5S

On Sun, Jul 30, 2017 at 1:12 PM, Wayne Burdick  wrote:

> Hi all,
>
> On 6 m, everyone uses grid squares when reporting their QTH. Is there a
> web tool or spreadsheet available somewhere that allows you to conveniently
> keep track of which ones you’ve worked?
>
> Thanks,
> Wayne
> N6KR
>
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Re: [Elecraft] How to keep track of grid squares logged?

[Michael Walker]

Log4om will create a google earth view that is pretty cool. 

I just did one last night.  35 grids on ft8 in a week. 

Mike va3mw

Sent from my iPad

> On Jul 30, 2017, at 2:30 PM, Richard Lamont  wrote:
> 
>> On 30/07/17 19:12, Wayne Burdick wrote:
>> 
>> On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
>> tool or spreadsheet available somewhere that allows you to conveniently keep 
>> track of which ones you’ve worked?
> 
> I just used a paper map and a highlight marker. This worked infallibly
> right up to the senior moment when I put the map in the shredder.
> 
> 73,
> Richard G4DYA
> 
> 
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Re: [Elecraft] KX3 (SN01674) and CW in SSB - Feature request

[Martin Theodor Grewe]

Hi @ll,

a final update to explain what can be done:

use macros and assign these to button PF1 and/or PF2:
PF1 - CWINSSB DELAY;MD3;KS014;BW0240;ML005;MG033;AG040;SWT11;SWT19;
PF2 - CLEANUP
DELAY;MD3;BW0240;ML005;MD2;DELAY;MN255;BW0240;ML001;NL0100;NB1;PA1;XT0;RT0;RA0;SQ0;SB0;LN0;LK0;AG040;BN16;DB05;

First: go to menu CW WGHT, tap PRE to "SSB +CW", tap CM;P to "VFO OFS".
PF1 means: you're in SSB-Mode, somebody is calling you in CW. PF1 switch to
CW, set CW keyer speed, bandwidth, monitor level, mic gain, send cw keyer 1
message
PF2 means: cleanup settings. CW bandwidth 2.4kHz, monitor level 5, mode
SSB, exit menue, bandwidth 2.4kHz, monitor level 1, NB on with level 1, PRE
on, XIT off, RIT off, ATT off,
squelch off, link vfo off, vfo lock off, audio level 40, go to 2m band,
display PA2 temp.

Thanks for the ideas and help.

73 de Martin, DL1MTG

2017-07-28 19:13 GMT+02:00 Martin Theodor Grewe :

> Hi Don,
>
> thanks for your answer and the idea to use macros.
>
> At this time I use KX3 utility to setup a macro for testing.
>
> E.g.:
> Macro 2: CWINSSB DELAY;MD3;DELAY;DELAY;KS014;BW0240;SWT11;SWT19;MD2;
> Starting mode: SSB: switch to CW, Keyer speed 14, bandwith 2.4kHz, Key MSG
> and Key 1... then back to SSB.
>
> Due to the "CW Text to send"-time the MD2 is ignored and I do not like to
> set "random" DELAYs to get MD2 working, depending an keyer speed.
> Any suggestions?
>
> Kind regards,
> 73 de Martin, DL1MTG
>
> 2017-07-28 0:15 GMT+02:00 Don Wilhelm :
>
>> Martin,
>>
>> Yes, the CW memories will not work well with CW in SSB.
>> Input from the paddles or hand key should work fine.
>>
>> If you must use the CW memories, you must switch to CW mode and set the
>> frequency above or below the SSB frequency.  Perhaps a macro could be
>> created to do that with one button push, and another to go back to SSB.
>>
>> 73,
>> Don W3FPR
>>
>>
>> On 7/27/2017 8:39 AM, Martin Theodor Grewe wrote:
>>
>>> Hi Don,
>>>
>>> thanks for your answer ​and Explanation. CW WGHT is known but not
>>> helpful in this case.
>>>
>>> I'll try to explan: CW WGHT is set to 800Hz. I'am operating in USB,
>>> using CW-In-SSB. I can answer the station.
>>> But station cannot read my signal, I try to answer with an stored CW
>>> Memory because I am lazy. Now I have to
>>> change mode from SSB to CW to get CW Memory ... and so on with the next
>>> SSB-session answering a cw Station again.
>>>
>>> This is, for my understanding, a bit too much: Change mode, activate cw
>>> keyer etc.
>>>
>>> Its easier to have "Extended CW memories" only for CW-IN-SSB in SSB-mode.
>>>
>>>
>>
>
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Re: [Elecraft] How to keep track of grid squares logged?

[Richard Lamont]

On 30/07/17 19:12, Wayne Burdick wrote:

> On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
> tool or spreadsheet available somewhere that allows you to conveniently keep 
> track of which ones you’ve worked?

I just used a paper map and a highlight marker. This worked infallibly
right up to the senior moment when I put the map in the shredder.

73,
Richard G4DYA


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[Elecraft] How to keep track of grid squares logged?

[Wayne Burdick]

Hi all,

On 6 m, everyone uses grid squares when reporting their QTH. Is there a web 
tool or spreadsheet available somewhere that allows you to conveniently keep 
track of which ones you’ve worked?

Thanks,
Wayne
N6KR

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[Elecraft] Big opening on 6 meters right now...

[Wayne Burdick]

73,
Wayne
N6KR

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Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Joe Subich, W4TV]

On 7/30/2017 12:47 PM, Kevin der Kinderen wrote:

> I hope it is OK to post the link:
> > 
https://community.flexradio.com/flexradio/topics/adc-overload-myths-debunked

Welcome to Flex's own myth.  If the information posted in that paper
were true, OFDM and/or CDMA base stations could use class C (or D or E)
amplifiers rated for average power.  That is demonstrably not true as
many signals of that type require class A or AB amplifiers with pre-
correction and peak power capacity of 6 to 20 dB greater than average
power output to prevent significant IMD issues.

73,

   ... Joe, W4TV


On 7/30/2017 12:47 PM, Kevin der Kinderen wrote:

Concerning Flex, one of the engineers posted a pretty detailed explanation
of how they handle strong signals in a wide band environment. This stuff is
still a bit over my head but owning both the KX3 and the Flex-6500 I can
say, I am never disappointed with either receiver in any environment. I
kind of feel like the luckiest dog in the world to have both.

I hope it is OK to post the link:

https://community.flexradio.com/flexradio/topics/adc-overload-myths-debunked

73,
Kev K4VD



On Sun, Jul 30, 2017 at 12:27 PM, GaryK9GS  wrote:


Thanks for sending Wayne.   To take this discussion a step further,  is
the Flex series of radios in the same category as the 7300?


73,
Gary K9GS
 Original message From: Wayne Burdick 
Date: 7/30/17  11:14 AM  (GMT-06:00) To: Elecraft Reflector <
elecraft@mailman.qth.net> Subject: [Elecraft] K3S (SDR/superhet hybrid)
vs. entry-level
 direct-sampling radios
Hi all,

Over the past two days I’ve been deluged with requests for our K3S vs.
IC7300 comparison chart. This stems from a posting that mentioned the
latter rig, and my subsequent offer to send out the chart, which we
normally use for in-house training purposes.

What’s become clear from all the questions and comments is that there’s a
need for clarification on receiver architecture.

The K3S, an SDR/superhet hybrid, includes narrowband protection of its
A-to-D converters in the form of roofing filters (crystal filters). This is
fundamentally different from the approach taken by direct-sampling radios,
which have only very broadband filtering ahead of their ADCs. Typically,
front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be
impacted by all strong signals in this range, alone and in summation.

When the ADC over-ranges in this “pure” SDR architecture, the radio
usually reduces its gain automatically by either turning off preamps or
adding attenuation. This increases the noise figure, often resulting in the
loss of weak signals, both audibly and in the panadapter. Another word for
it is “desense.” You might hear a pulsing sound as the noise floor goes up
and down in response to a particular signal, or the sensitivity may degrade
for many seconds at a time while the firmware waits for levels to drop at
the input to the ADC.

Such over-ranging is almost unheard of in the K3S, for multiple reasons.
First, we use very strong mixers and gain stages. Second, in many cases
there’s no need to turn the preamp on at all. (Example: the K3S’s
preamp-off sensitivity is typically -135 dB, while the preamp-off
sensitivity on a typical direct-sampling SDR is -115 to -125 dB.) The third
reason for the K3S’s strong-signal performance is its crystal roofing
filters. These protect the ADC from not only wide-spaced signals, but also
from signals very close by. As K3 and K3S owners will attest, you can have
a huge signal just a few hundred Hz away and not even know it’s there --
unless that station’s transmit phase noise is blanketing the band anyway.
(There’s no defense against an unclean or clicky transmit signal.)

I’ve updated the referenced comparison chart to clarify this important
difference. Our webmaster will put it up next week.

Meanwhile, I’ll continue to send it on request (email me directly). Feel
free to share the information with anyone interested in the topic.

73,
Wayne
N6KR




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Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Wayne Burdick]

I believe the Flex to be 16 bits and the Icom to be 14 bits, but if anyone has 
data to the the contrary, feel free to post it.

Even the most expensive 16-bit A-to-D converters, operating at RF sampling 
rates, can exhibit nonlinearity or even non-monotonicity in their lowest-order 
bits. The usual work-around is to dither (spread) the clock signal, either on 
the chip itself or by injecting a separate tone. This can help, but the results 
can be uneven. The result is that two direct-sampling radios of exactly the 
same model can vary considerably in IMD performance.

In the K3S, the ADC is operated at much lower sampling rates (48 kHz, as 
required for the 15 kHz second IF). Since it is also fully protected by crystal 
roofing filters, an entire class of wideband sampling spurious responses is 
eliminated, and the much higher “NBSFDR” spec applies (narrowband spurious-free 
dynamic range). No dithering is required, and receiver sensitivity never has to 
be reduced due to out-of-band signals. That and the strong front end are why so 
many Field Day, multi-op contest, and DXpeditions stations use K3S’s and K3’s.

73,
Wayne
N6KR



> On Jul 30, 2017, at 9:49 AM, Lynn W. Taylor, WB6UUT 
>  wrote:
> 
> Wayne,
> 
> How much resolution is available (how many bits per sample) in the typical 
> modern A/D converter used in an IC-7300 or Flex?
> 
> 73 -- Lynn
> 
> On 7/30/2017 9:14 AM, Wayne Burdick wrote:
>> The K3S, an SDR/superhet hybrid, includes narrowband protection of its 
>> A-to-D converters in the form of roofing filters (crystal filters). This is 
>> fundamentally different from the approach taken by direct-sampling radios, 
>> which have only very broadband filtering ahead of their ADCs. Typically, 
>> front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be 
>> impacted by all strong signals in this range, alone and in summation.




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Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Wayne Burdick]

We’re quite familiar with this document. But blocking is blocking: a single 
strong signal in the passband of the RF band-pass filter can overrange the ADC, 
causing desense or spurious responses, thus requiring that gain be reduced 
ahead of it. Clever firmware can help, but it can’t  overcome the basic 
limitation on ADC input voltage spec. 

73,
Wayne
N6KR



> On Jul 30, 2017, at 9:47 AM, Kevin der Kinderen  wrote:
> 
> Concerning Flex, one of the engineers posted a pretty detailed explanation
> of how they handle strong signals in a wide band environment. This stuff is
> still a bit over my head but owning both the KX3 and the Flex-6500 I can
> say, I am never disappointed with either receiver in any environment. I
> kind of feel like the luckiest dog in the world to have both.
> 
> I hope it is OK to post the link:
> 
> https://community.flexradio.com/flexradio/topics/adc-overload-myths-debunked
> 
> 73,
> Kev K4VD
> 
> 
> 
> On Sun, Jul 30, 2017 at 12:27 PM, GaryK9GS  wrote:
> 
>> Thanks for sending Wayne.   To take this discussion a step further,  is
>> the Flex series of radios in the same category as the 7300?
>> 
>> 
>> 73,
>> Gary K9GS
>>  Original message From: Wayne Burdick 
>> Date: 7/30/17  11:14 AM  (GMT-06:00) To: Elecraft Reflector <
>> elecraft@mailman.qth.net> Subject: [Elecraft] K3S (SDR/superhet hybrid)
>> vs. entry-level
>>direct-sampling radios
>> Hi all,
>> 
>> Over the past two days I’ve been deluged with requests for our K3S vs.
>> IC7300 comparison chart. This stems from a posting that mentioned the
>> latter rig, and my subsequent offer to send out the chart, which we
>> normally use for in-house training purposes.
>> 
>> What’s become clear from all the questions and comments is that there’s a
>> need for clarification on receiver architecture.
>> 
>> The K3S, an SDR/superhet hybrid, includes narrowband protection of its
>> A-to-D converters in the form of roofing filters (crystal filters). This is
>> fundamentally different from the approach taken by direct-sampling radios,
>> which have only very broadband filtering ahead of their ADCs. Typically,
>> front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be
>> impacted by all strong signals in this range, alone and in summation.
>> 
>> When the ADC over-ranges in this “pure” SDR architecture, the radio
>> usually reduces its gain automatically by either turning off preamps or
>> adding attenuation. This increases the noise figure, often resulting in the
>> loss of weak signals, both audibly and in the panadapter. Another word for
>> it is “desense.” You might hear a pulsing sound as the noise floor goes up
>> and down in response to a particular signal, or the sensitivity may degrade
>> for many seconds at a time while the firmware waits for levels to drop at
>> the input to the ADC.
>> 
>> Such over-ranging is almost unheard of in the K3S, for multiple reasons.
>> First, we use very strong mixers and gain stages. Second, in many cases
>> there’s no need to turn the preamp on at all. (Example: the K3S’s
>> preamp-off sensitivity is typically -135 dB, while the preamp-off
>> sensitivity on a typical direct-sampling SDR is -115 to -125 dB.) The third
>> reason for the K3S’s strong-signal performance is its crystal roofing
>> filters. These protect the ADC from not only wide-spaced signals, but also
>> from signals very close by. As K3 and K3S owners will attest, you can have
>> a huge signal just a few hundred Hz away and not even know it’s there --
>> unless that station’s transmit phase noise is blanketing the band anyway.
>> (There’s no defense against an unclean or clicky transmit signal.)
>> 
>> I’ve updated the referenced comparison chart to clarify this important
>> difference. Our webmaster will put it up next week.
>> 
>> Meanwhile, I’ll continue to send it on request (email me directly). Feel
>> free to share the information with anyone interested in the topic.
>> 
>> 73,
>> Wayne
>> N6KR
>> 
>> 
>> 
>> 
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Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Lynn W. Taylor, WB6UUT]

Wayne,

How much resolution is available (how many bits per sample) in the 
typical modern A/D converter used in an IC-7300 or Flex?


73 -- Lynn

On 7/30/2017 9:14 AM, Wayne Burdick wrote:

The K3S, an SDR/superhet hybrid, includes narrowband protection of its A-to-D 
converters in the form of roofing filters (crystal filters). This is 
fundamentally different from the approach taken by direct-sampling radios, 
which have only very broadband filtering ahead of their ADCs. Typically, 
front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be impacted 
by all strong signals in this range, alone and in summation.

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Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Kevin der Kinderen]

Concerning Flex, one of the engineers posted a pretty detailed explanation
of how they handle strong signals in a wide band environment. This stuff is
still a bit over my head but owning both the KX3 and the Flex-6500 I can
say, I am never disappointed with either receiver in any environment. I
kind of feel like the luckiest dog in the world to have both.

I hope it is OK to post the link:

https://community.flexradio.com/flexradio/topics/adc-overload-myths-debunked

73,
Kev K4VD



On Sun, Jul 30, 2017 at 12:27 PM, GaryK9GS  wrote:

> Thanks for sending Wayne.   To take this discussion a step further,  is
> the Flex series of radios in the same category as the 7300?
>
>
> 73,
> Gary K9GS
>  Original message From: Wayne Burdick 
> Date: 7/30/17  11:14 AM  (GMT-06:00) To: Elecraft Reflector <
> elecraft@mailman.qth.net> Subject: [Elecraft] K3S (SDR/superhet hybrid)
> vs. entry-level
> direct-sampling radios
> Hi all,
>
> Over the past two days I’ve been deluged with requests for our K3S vs.
> IC7300 comparison chart. This stems from a posting that mentioned the
> latter rig, and my subsequent offer to send out the chart, which we
> normally use for in-house training purposes.
>
> What’s become clear from all the questions and comments is that there’s a
> need for clarification on receiver architecture.
>
> The K3S, an SDR/superhet hybrid, includes narrowband protection of its
> A-to-D converters in the form of roofing filters (crystal filters). This is
> fundamentally different from the approach taken by direct-sampling radios,
> which have only very broadband filtering ahead of their ADCs. Typically,
> front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be
> impacted by all strong signals in this range, alone and in summation.
>
> When the ADC over-ranges in this “pure” SDR architecture, the radio
> usually reduces its gain automatically by either turning off preamps or
> adding attenuation. This increases the noise figure, often resulting in the
> loss of weak signals, both audibly and in the panadapter. Another word for
> it is “desense.” You might hear a pulsing sound as the noise floor goes up
> and down in response to a particular signal, or the sensitivity may degrade
> for many seconds at a time while the firmware waits for levels to drop at
> the input to the ADC.
>
> Such over-ranging is almost unheard of in the K3S, for multiple reasons.
> First, we use very strong mixers and gain stages. Second, in many cases
> there’s no need to turn the preamp on at all. (Example: the K3S’s
> preamp-off sensitivity is typically -135 dB, while the preamp-off
> sensitivity on a typical direct-sampling SDR is -115 to -125 dB.) The third
> reason for the K3S’s strong-signal performance is its crystal roofing
> filters. These protect the ADC from not only wide-spaced signals, but also
> from signals very close by. As K3 and K3S owners will attest, you can have
> a huge signal just a few hundred Hz away and not even know it’s there --
> unless that station’s transmit phase noise is blanketing the band anyway.
> (There’s no defense against an unclean or clicky transmit signal.)
>
> I’ve updated the referenced comparison chart to clarify this important
> difference. Our webmaster will put it up next week.
>
> Meanwhile, I’ll continue to send it on request (email me directly). Feel
> free to share the information with anyone interested in the topic.
>
> 73,
> Wayne
> N6KR
>
>
>
>
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Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Wayne Burdick]

> GaryK9GS  wrote:
> 
> Thanks for sending Wayne.   To take this discussion a step further,  is the 
> Flex series of radios in the same category as the 7300?


Flex radios do use a direct-sampling architecture (with no roofing filters). 
The degree to which they’re subject to ADC over-range, and what they do about 
it in firmware, has been the subject of ongoing debate. It may be the case 
that, generally, the more you pay for a direct-sampling radio, the better the 
A-to-D converters, and the higher the ADC overrange threshold. 

That said, when measured with preamp off, the Flex 6700 has about 7 dB less IMD 
dynamic range than the K3S (see note Y in Sherwood’s chart), and 20 dB less 
blocking dynamic range. Both are direct consequences of not having narrowband 
roofing filters.

On the other hand, the Flex radios have a very broad panadapter display for 
those who require it.

73,
Wayne
N6KR


> 
> 
> 73,
> Gary K9GS
>  Original message From: Wayne Burdick  
> Date: 7/30/17  11:14 AM  (GMT-06:00) To: Elecraft Reflector 
>  Subject: [Elecraft] K3S (SDR/superhet hybrid) vs. 
> entry-level
>   direct-sampling radios 
> Hi all,
> 
> Over the past two days I’ve been deluged with requests for our K3S vs. IC7300 
> comparison chart. This stems from a posting that mentioned the latter rig, 
> and my subsequent offer to send out the chart, which we normally use for 
> in-house training purposes.
> 
> What’s become clear from all the questions and comments is that there’s a 
> need for clarification on receiver architecture. 
> 
> The K3S, an SDR/superhet hybrid, includes narrowband protection of its A-to-D 
> converters in the form of roofing filters (crystal filters). This is 
> fundamentally different from the approach taken by direct-sampling radios, 
> which have only very broadband filtering ahead of their ADCs. Typically, 
> front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be 
> impacted by all strong signals in this range, alone and in summation.
> 
> When the ADC over-ranges in this “pure” SDR architecture, the radio usually 
> reduces its gain automatically by either turning off preamps or adding 
> attenuation. This increases the noise figure, often resulting in the loss of 
> weak signals, both audibly and in the panadapter. Another word for it is 
> “desense.” You might hear a pulsing sound as the noise floor goes up and down 
> in response to a particular signal, or the sensitivity may degrade for many 
> seconds at a time while the firmware waits for levels to drop at the input to 
> the ADC.
> 
> Such over-ranging is almost unheard of in the K3S, for multiple reasons. 
> First, we use very strong mixers and gain stages. Second, in many cases 
> there’s no need to turn the preamp on at all. (Example: the K3S’s preamp-off 
> sensitivity is typically -135 dB, while the preamp-off sensitivity on a 
> typical direct-sampling SDR is -115 to -125 dB.) The third reason for the 
> K3S’s strong-signal performance is its crystal roofing filters. These protect 
> the ADC from not only wide-spaced signals, but also from signals very close 
> by. As K3 and K3S owners will attest, you can have a huge signal just a few 
> hundred Hz away and not even know it’s there -- unless that station’s 
> transmit phase noise is blanketing the band anyway. (There’s no defense 
> against an unclean or clicky transmit signal.)
> 
> I’ve updated the referenced comparison chart to clarify this important 
> difference. Our webmaster will put it up next week.
> 
> Meanwhile, I’ll continue to send it on request (email me directly). Feel free 
> to share the information with anyone interested in the topic.
> 
> 73,
> Wayne
> N6KR
> 
> 
> 
> 
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[Elecraft] OT: Re: W2 Wattmeter 440 band accuracy?

[Rose]

The accuracy of a Bird Model 43 is +/- 5% of full scale.  The meter scale
is not
linear and produces the best read accuracy in the bottom portion of the
meter's
scale.

There are numerous watt meters on the market today that are more accurate.

FWIW  73!

Ken Kopp - K0PP
--
On Sun, Jul 30, 2017 at 9:23 AM, Michael Walker 
wrote:

> The only way to get the answer you wish is to compare it to a bench
> standard like a bird watt meter.
>
> Beyond that you are just guessing.   Sorry
>
> Mike va3mw
>
>
> On Sun, Jul 30, 2017 at 11:18 AM, Michael via Elecraft <
> elecraft@mailman.qth.net> wrote:
>
> > Measurement is in analog mode.should have made that clear or not even
> > mentioned a digital radio!
> >
> > Michael
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Re: [Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[GaryK9GS]

Thanks for sending Wayne.   To take this discussion a step further,  is the 
Flex series of radios in the same category as the 7300?


73,
Gary K9GS
 Original message From: Wayne Burdick  Date: 
7/30/17  11:14 AM  (GMT-06:00) To: Elecraft Reflector 
 Subject: [Elecraft] K3S (SDR/superhet hybrid) vs. 
entry-level
direct-sampling radios 
Hi all,

Over the past two days I’ve been deluged with requests for our K3S vs. IC7300 
comparison chart. This stems from a posting that mentioned the latter rig, and 
my subsequent offer to send out the chart, which we normally use for in-house 
training purposes.

What’s become clear from all the questions and comments is that there’s a need 
for clarification on receiver architecture. 

The K3S, an SDR/superhet hybrid, includes narrowband protection of its A-to-D 
converters in the form of roofing filters (crystal filters). This is 
fundamentally different from the approach taken by direct-sampling radios, 
which have only very broadband filtering ahead of their ADCs. Typically, 
front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be impacted 
by all strong signals in this range, alone and in summation.

When the ADC over-ranges in this “pure” SDR architecture, the radio usually 
reduces its gain automatically by either turning off preamps or adding 
attenuation. This increases the noise figure, often resulting in the loss of 
weak signals, both audibly and in the panadapter. Another word for it is 
“desense.” You might hear a pulsing sound as the noise floor goes up and down 
in response to a particular signal, or the sensitivity may degrade for many 
seconds at a time while the firmware waits for levels to drop at the input to 
the ADC.

Such over-ranging is almost unheard of in the K3S, for multiple reasons. First, 
we use very strong mixers and gain stages. Second, in many cases there’s no 
need to turn the preamp on at all. (Example: the K3S’s preamp-off sensitivity 
is typically -135 dB, while the preamp-off sensitivity on a typical 
direct-sampling SDR is -115 to -125 dB.) The third reason for the K3S’s 
strong-signal performance is its crystal roofing filters. These protect the ADC 
from not only wide-spaced signals, but also from signals very close by. As K3 
and K3S owners will attest, you can have a huge signal just a few hundred Hz 
away and not even know it’s there -- unless that station’s transmit phase noise 
is blanketing the band anyway. (There’s no defense against an unclean or clicky 
transmit signal.)

I’ve updated the referenced comparison chart to clarify this important 
difference. Our webmaster will put it up next week.

Meanwhile, I’ll continue to send it on request (email me directly). Feel free 
to share the information with anyone interested in the topic.

73,
Wayne
N6KR




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[Elecraft] K3S (SDR/superhet hybrid) vs. entry-level direct-sampling radios

[Wayne Burdick]

Hi all,

Over the past two days I’ve been deluged with requests for our K3S vs. IC7300 
comparison chart. This stems from a posting that mentioned the latter rig, and 
my subsequent offer to send out the chart, which we normally use for in-house 
training purposes.

What’s become clear from all the questions and comments is that there’s a need 
for clarification on receiver architecture. 

The K3S, an SDR/superhet hybrid, includes narrowband protection of its A-to-D 
converters in the form of roofing filters (crystal filters). This is 
fundamentally different from the approach taken by direct-sampling radios, 
which have only very broadband filtering ahead of their ADCs. Typically, 
front-end band-pass filters are 0.5 to 4 MHz wide. Their ADCs will be impacted 
by all strong signals in this range, alone and in summation.

When the ADC over-ranges in this “pure” SDR architecture, the radio usually 
reduces its gain automatically by either turning off preamps or adding 
attenuation. This increases the noise figure, often resulting in the loss of 
weak signals, both audibly and in the panadapter. Another word for it is 
“desense.” You might hear a pulsing sound as the noise floor goes up and down 
in response to a particular signal, or the sensitivity may degrade for many 
seconds at a time while the firmware waits for levels to drop at the input to 
the ADC.

Such over-ranging is almost unheard of in the K3S, for multiple reasons. First, 
we use very strong mixers and gain stages. Second, in many cases there’s no 
need to turn the preamp on at all. (Example: the K3S’s preamp-off sensitivity 
is typically -135 dB, while the preamp-off sensitivity on a typical 
direct-sampling SDR is -115 to -125 dB.) The third reason for the K3S’s 
strong-signal performance is its crystal roofing filters. These protect the ADC 
from not only wide-spaced signals, but also from signals very close by. As K3 
and K3S owners will attest, you can have a huge signal just a few hundred Hz 
away and not even know it’s there -- unless that station’s transmit phase noise 
is blanketing the band anyway. (There’s no defense against an unclean or clicky 
transmit signal.)

I’ve updated the referenced comparison chart to clarify this important 
difference. Our webmaster will put it up next week.

Meanwhile, I’ll continue to send it on request (email me directly). Feel free 
to share the information with anyone interested in the topic.

73,
Wayne
N6KR




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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Michael Walker]

The only way to get the answer you wish is to compare it to a bench
standard like a bird watt meter.

Beyond that you are just guessing.   Sorry

Mike va3mw


On Sun, Jul 30, 2017 at 11:18 AM, Michael via Elecraft <
elecraft@mailman.qth.net> wrote:

> Measurement is in analog mode.should have made that clear or not even
> mentioned a digital radio!
>
> Michael
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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Michael via Elecraft]

Measurement is in analog mode.should have made that clear or not even  
mentioned a digital radio!
 
Michael
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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Philip]

That would depend on what kind of digital you are talking about. I don't 
think the W2 reads instantaneous peak power. That usually takes special 
circuitry to do . Hint: a digital slug for a bird 43 wattmeter costs way 
more than the meter does. Analog meters will not read properly in a 
digital environment. Try the radio in analog mode.


Phil, wd8qwr
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[Elecraft] W2 Wattmeter 440 band accuracy?

[Michael via Elecraft]

I just purchased a new Yaesu digital handheld and the power level on the  
440 band is low (2.8 v 5.0 Watts), and was wondering if I can trust the W2's  
accuracy? Another mobile higher powered transceiver also reads low on all 
power  levels on the 440 band.
 
I built the kit version of the W2 and have the VHF/UHF  coupler
 
Why is there a +/- calibration button on the PC interface if the unit is  
calibrated properly?
 
I can send my HT back to be tested and exchanged if it isn't making specs  
but don't want to be told that
my wattmeter reading was inaccurate!
 
73's Michael
n2zdb
 
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Re: [Elecraft] [K3S] K3S High SWR Shutdown on FT8?

[Don Wilhelm]

Bret,

As far as I know, the K3S does not have any audible alarm.
So that leaves 2 elements in your setup that could be producing that 
alarm - the remote ATU control unit, or the computer you are using.
The "alarm" could also be the result of some sort of feedback and is 
'just something that happens' but is not really intended to be an alarm.


If you find your remote ATU is causing the problem, check all 
connections at the antenna.  It is quite common for a connection to be 
OK at lower powers, but when the power is increased, something breaks 
down causing the problem.  If you can verify that it is an SWR problem, 
then look carefully at the antenna for the solution.


73,
Don W3FPR

On 7/30/2017 9:16 AM, MaverickNH wrote:

I'm using a K3S/100 with ATU to drive a 43ft vertical with remote ATU at
base. To operate, I typically bypass the K3S ATU, tune the remote ATU to 1:1
on 20m, then turn the K3S ATU to auto and tune again to 1:1 reading on the
K3S. Running WSJT-X FT8 digital mode at 63W, all is fine, but if I run 100W
too long I sometimes hear an alarm and turn power back to 63W (the alarm
stops) or the K3S just shuts down. I'm not sure where the high-pitch alarm
is coming from - I have a nearby Yaesu FP3010A Linear PSU but the manual
mentions nothing about an alarm. Nor does the K3S mention an alarm. I see no
High SWR warning on the K3S display. The PSU does not turn off.

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[Elecraft] [K3S] K3S High SWR Shutdown on FT8?

[MaverickNH]

I'm using a K3S/100 with ATU to drive a 43ft vertical with remote ATU at
base. To operate, I typically bypass the K3S ATU, tune the remote ATU to 1:1
on 20m, then turn the K3S ATU to auto and tune again to 1:1 reading on the
K3S. Running WSJT-X FT8 digital mode at 63W, all is fine, but if I run 100W
too long I sometimes hear an alarm and turn power back to 63W (the alarm
stops) or the K3S just shuts down. I'm not sure where the high-pitch alarm
is coming from - I have a nearby Yaesu FP3010A Linear PSU but the manual
mentions nothing about an alarm. Nor does the K3S mention an alarm. I see no
High SWR warning on the K3S display. The PSU does not turn off.

Any thoughts appreciated!

Bret/N4SRN



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