Re: [Elecraft] K4 on AM

[W2xj]

There is an old rule that the product of the lowest and highest audio 
frequencies should be between 450,000 and 500,000 (depending on which ‘expert’ 
you ask).  Under that rule, a 3 KHz audio response should have a low end 
response of 150 Hertz for a balanced sound. 

Sent from my iPad

> On Mar 2, 2020, at 8:02 PM, Bob McGraw K4TAX  wrote:
> 
> Why is it we are always prone to boost or add something?   Ever thought of 
> taking away something?   With most EQ systems, attenuation excessive energy 
> is much preferable to boosting anything.
> 
> So if ones audio is bassy or muddy, do we add high end or reduce low end?   
> Hint:  it is not adding high end.   Jim, K9YC, has written much on this 
> topic.  If in doubt, always attenuate first.
> 
> If the glass is full of wine and one desires more wine, what's the choice?  
> Surely one can't add more wine or the glass will overflow.   Then the 
> solution is to take a drink of wine, thus reduce the amount of wine in the 
> glass.  Same for boosting in audio.  The system has a point where it is full 
> and will overflow.   It won't get better, but it will get worse.
> 
> 73
> 
> Bob, K4TAX
> 
>> On 3/2/2020 2:10 PM, Joe Subich, W4TV wrote:
>> When a user cranks up the low frequency audio EQ on those
>> rigs and then uses high level of audio processing the
>> unfiltered (as in after the DSP/IF filter) PA chain 
> 
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Re: [Elecraft] K4 on AM

[W2xj]

i would beg to differ. Amateur radio is a hobby comprised of experimenters, 
home-brewers, DXers, contesters, ragchewers, CW enthusiasts and EM comms to 
name a few. Each group has their own technical needs. 

Regarding AM in transceivers,  it hasn’t been properly implemented for the last 
50 years or more. It is a derivative based on SSB generation which introduces 
many shortcomings with the worst being steep skirted SSB filters.

I’ve worked professionally with AM broadcast transmitters since 1958 and 
watched them evolve over the decades as we perfected the science over that 
time. I’ve worked with LW and MW transmitters to 2 megawatts and shortwave to 
500 kilowatts over the years and consulted on design with almost every major TX 
manufacturer. 

One of the basics is that a transmitter should have an audio bandwidth 2 to 3 
times the actual transmitted audio bandwidth. Bandwidth and peak control is 
then external to the TX. Lack of that capability is part of the reason some 
transceivers sound bad on AM. It is also the source of part of how some hold AM 
in low esteem due IM and other distortions in the linear amplification  chain, 
again, due to a predominately SSB oriented design. There are a number of 
modified BC TXs mostly on 160 and 80 meters with audio bandwidths between 10 
and 20 KHz and they dont have the same issues but they do have proper audio 
processing feeding them.

Back in the 1950s when AM still ruled the ham bands transmitters did not have 
the same issues as they were designed for AM and CW operation and did not have 
audio filtering even though there were more hams back then. Spectral 
distribution of speech have frequencies around 5 KHz20 to 30 db below speech 
fundamentals so the impact is not what many might think when the TX is 
otherwise clean. 

Bottom line, AM in transceivers is a compromise that takes a back seat to SSB. 

Sent from my iPad

> On Mar 2, 2020, at 3:07 PM, Joe Subich, W4TV  wrote:
> 
> On 2020-03-02 11:34 AM, Grant Youngman wrote:
> >
> > A maximum around 6 KHz would be better,
> 
> Audio response greater than 3 KHz is *never* appropriate for
> amateur radio.  Amateur radio is, after all, a communications
> service not an entertainment medium.
> 
> As a certain FCC official said in a hamfest forum a few  years
> ago, "if you want more than 3 KHz, get a *BROADCAST* license."
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 
>> On 2020-03-02 11:34 AM, Grant Youngman wrote:
>> An audio response of 4-5 KHz isn’t unreasonable.  A maximum around 6 KHz 
>> would be better, and since it will be adjustable, the response (with 
>> relatively steep rolloff) can be tailored to be compatible with band 
>> conditions and occupancy as necessary.
>> I know this is a sensitive, if not plain explosive, topic in some circles — 
>> but most AM users do manage their bandwidth with common sense, and to be 
>> considerate of the rest of the community.
>> Grant NQ5T
 On Mar 2, 2020, at 10:46 AM, Eric Swartz  wrote:
>>> 
>>> One note - Wayne is saying the K4 -audio- b/w in AM will be somewhere
>>> between 4 and 5 kHz.  The actual DSB AM b/w that results will be between 8
>>> and 10 kHz.
>>> 
>>> 73,
>>> Eric
>>> *elecraft.com *
>>> 
>>> 
> 
> 
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Re: [Elecraft] K4 on AM

[Bob McGraw K4TAX]

Why is it we are always prone to boost or add something?   Ever thought 
of taking away something?   With most EQ systems, attenuation excessive 
energy is much preferable to boosting anything.


So if ones audio is bassy or muddy, do we add high end or reduce low 
end?   Hint:  it is not adding high end.   Jim, K9YC, has written much 
on this topic.  If in doubt, always attenuate first.


If the glass is full of wine and one desires more wine, what's the 
choice?  Surely one can't add more wine or the glass will overflow.   
Then the solution is to take a drink of wine, thus reduce the amount of 
wine in the glass.  Same for boosting in audio.  The system has a point 
where it is full and will overflow.   It won't get better, but it will 
get worse.


73

Bob, K4TAX

On 3/2/2020 2:10 PM, Joe Subich, W4TV wrote:

When a user cranks up the low frequency audio EQ on those
rigs and then uses high level of audio processing the
unfiltered (as in after the DSP/IF filter) PA chain 


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Re: [Elecraft] K4 on AM

[Grant Youngman]

Here we go. It just never ends.  

I apologize to the list for asking what is apparently a stupid, ignorant, 
unschooled, and ham-immoral question. Clearly beyond the bounds of “good 
amateur practice”.  FWIW, I have also been subjected to multiple private emails 
implying the same, for which I thave privately taken  umbrage.  THIS IS NOT 
NECESSARY — from anyone.  It was just a question!

I will NEVER ask another question about AM or bandwidth on this list.   I bow 
to your collective excellence.   I raise my arm in the appropriate salute.

Folks, this is just beyond the pale :-(   I asked one simple question.  I got 
an answer from Elecraft, and I’m happy with that,  Why not just STFU.

I hope Eric has the sanity to close this thread.  I’m out … and will privately 
and hopefully await the performance of the K4 in this regard.

Grant NQ5T



> On Mar 2, 2020, at 5:28 PM, Charlie T  wrote:
> 
> I think he "may" be confusing the high audio limit with the resulting 2X 
> bandwidth.
> 
> 6kHz transmit bandwidth is obviously NOT the result of 6 KHz audio.
> 
> However, it is easy to get mixed up on this.
> 
> Charlie k3ICH
> 
> 
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On 
> Behalf Of Rose
> Sent: Monday, March 02, 2020 4:30 PM
> To: David Gilbert 
> Cc: Elecraft Reflector 
> Subject: Re: [Elecraft] K4 on AM
> 
> Well said, Dave
> 
> 73
> 
> K0PP
> 
> 
> On Mon, Mar 2, 2020, 14:23 David Gilbert  wrote:
> 
>> 
>> Well, when a minority few seem to think that they should be special 
>> enough to use far more bandwidth than the rest of us do, then I'd say 
>> the horse isn't dead yet.  If everyone ran AM that wide that the bands 
>> would sound horrible.  If that isn't a good enough definition of 
>> presumed entitlement I don't know what is.
>> 
>> Why Elecraft is willing to enable people to use 10 KHz of bandwidth 
>> for no good communication reason is beyond me.  It would certainly 
>> make me think thrice about supporting a K4.
>> 
>> And Joe didn't bring up the subject ... you and W2XJ did.
>> 
>> Dave   AB7E
>> 
>> 
>> 
>> On 3/2/2020 1:13 PM, Grant Youngman wrote:
>>> smh … :-(
>>> 
>>> Why did I know this would happen?  Do we really have to keep beating
>> this same tired horse? Really?
>>> 
>>> Grant NQ5T
>>> 
 On Mar 2, 2020, at 3:06 PM, Joe Subich, W4TV  wrote:
 
 On 2020-03-02 11:34 AM, Grant Youngman wrote:
> A maximum around 6 KHz would be better,
 Audio response greater than 3 KHz is *never* appropriate for 
 amateur radio.  Amateur radio is, after all, a communications 
 service not an entertainment medium.
 
 As a certain FCC official said in a hamfest forum a few  years ago, 
 "if you want more than 3 KHz, get a *BROADCAST* license."
 
 73,
 
   ... Joe, W4TV
>> 
>> 
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Re: [Elecraft] K4 on AM

[Charlie T]

I think he "may" be confusing the high audio limit with the resulting 2X 
bandwidth.

6kHz transmit bandwidth is obviously NOT the result of 6 KHz audio.

However, it is easy to get mixed up on this.

Charlie k3ICH




-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Rose
Sent: Monday, March 02, 2020 4:30 PM
To: David Gilbert 
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] K4 on AM

Well said, Dave

73

K0PP


On Mon, Mar 2, 2020, 14:23 David Gilbert  wrote:

>
> Well, when a minority few seem to think that they should be special 
> enough to use far more bandwidth than the rest of us do, then I'd say 
> the horse isn't dead yet.  If everyone ran AM that wide that the bands 
> would sound horrible.  If that isn't a good enough definition of 
> presumed entitlement I don't know what is.
>
> Why Elecraft is willing to enable people to use 10 KHz of bandwidth 
> for no good communication reason is beyond me.  It would certainly 
> make me think thrice about supporting a K4.
>
> And Joe didn't bring up the subject ... you and W2XJ did.
>
> Dave   AB7E
>
>
>
> On 3/2/2020 1:13 PM, Grant Youngman wrote:
> > smh … :-(
> >
> > Why did I know this would happen?  Do we really have to keep beating
> this same tired horse? Really?
> >
> > Grant NQ5T
> >
> >> On Mar 2, 2020, at 3:06 PM, Joe Subich, W4TV  wrote:
> >>
> >> On 2020-03-02 11:34 AM, Grant Youngman wrote:
> >>> A maximum around 6 KHz would be better,
> >> Audio response greater than 3 KHz is *never* appropriate for 
> >> amateur radio.  Amateur radio is, after all, a communications 
> >> service not an entertainment medium.
> >>
> >> As a certain FCC official said in a hamfest forum a few  years ago, 
> >> "if you want more than 3 KHz, get a *BROADCAST* license."
> >>
> >> 73,
> >>
> >>... Joe, W4TV
>
>
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[Elecraft] Elecraft 40 meter SSB net

[Steve Hall]

We held the first 40 meter net Sunday on 7.282 at 1845Z.  I hope others
from the 20 meter net will join us.  We had a very good turn out for a
starting event.  I believe this will expand as more learn of the net.
As there is an existing net at 1900Z near our frequency in NE we shall
change to  7.280 to avoid a conflict.  It is very difficult to establish a
new net frequency and fit into the existing traffic.  Future frequency
adjustments may be necessary.
Details of some check-ins were unavailable due to changing propagation.
I thank the stations that helped relay others into the net.

WM6P   Steve  GA   K3S 11453net control
N4NRW Roger SC   K31318
K8NU CarlOH   FT857
W5RGBobFLK31440
K1NW Brian   RIK34974
W8DRP  DonOH  IC 7300
K6VWE  MI
W4JSH   Jeff  TN  K3 2378
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Re: [Elecraft] K4 on AM

[Jim Brown]

On 3/2/2020 12:06 PM, Joe Subich, W4TV wrote:

As a certain FCC official said in a hamfest forum a few  years
ago, "if you want more than 3 KHz, get a *BROADCAST* license."


The guy who said it was Riley Hollingsworth, who almost single-handedly 
cleaned up the ham bands before retiring 8-10 years ago.


I personally have no problem with wider bandwidth IF it's not practiced 
on crowded bands. At this low part of the solar cycle, bands like 40 and 
20 phone bands are pretty packed when they're open, and prop on the 
higher bands mostly stinks. :) Wider bandwidth can certainly work in the 
Extra segment of 75 and the upper part of 160.


73, Jim K9YC
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Re: [Elecraft] K4 on AM

[Rose]

Well said, Dave

73

K0PP


On Mon, Mar 2, 2020, 14:23 David Gilbert  wrote:

>
> Well, when a minority few seem to think that they should be special
> enough to use far more bandwidth than the rest of us do, then I'd say
> the horse isn't dead yet.  If everyone ran AM that wide that the bands
> would sound horrible.  If that isn't a good enough definition of
> presumed entitlement I don't know what is.
>
> Why Elecraft is willing to enable people to use 10 KHz of bandwidth for
> no good communication reason is beyond me.  It would certainly make me
> think thrice about supporting a K4.
>
> And Joe didn't bring up the subject ... you and W2XJ did.
>
> Dave   AB7E
>
>
>
> On 3/2/2020 1:13 PM, Grant Youngman wrote:
> > smh … :-(
> >
> > Why did I know this would happen?  Do we really have to keep beating
> this same tired horse? Really?
> >
> > Grant NQ5T
> >
> >> On Mar 2, 2020, at 3:06 PM, Joe Subich, W4TV  wrote:
> >>
> >> On 2020-03-02 11:34 AM, Grant Youngman wrote:
> >>> A maximum around 6 KHz would be better,
> >> Audio response greater than 3 KHz is *never* appropriate for
> >> amateur radio.  Amateur radio is, after all, a communications
> >> service not an entertainment medium.
> >>
> >> As a certain FCC official said in a hamfest forum a few  years
> >> ago, "if you want more than 3 KHz, get a *BROADCAST* license."
> >>
> >> 73,
> >>
> >>... Joe, W4TV
>
>
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Re: [Elecraft] K4 on AM

[David Gilbert]

Well, when a minority few seem to think that they should be special 
enough to use far more bandwidth than the rest of us do, then I'd say 
the horse isn't dead yet.  If everyone ran AM that wide that the bands 
would sound horrible.  If that isn't a good enough definition of 
presumed entitlement I don't know what is.


Why Elecraft is willing to enable people to use 10 KHz of bandwidth for 
no good communication reason is beyond me.  It would certainly make me 
think thrice about supporting a K4.


And Joe didn't bring up the subject ... you and W2XJ did.

Dave   AB7E



On 3/2/2020 1:13 PM, Grant Youngman wrote:

smh … :-(

Why did I know this would happen?  Do we really have to keep beating this same 
tired horse? Really?

Grant NQ5T


On Mar 2, 2020, at 3:06 PM, Joe Subich, W4TV  wrote:

On 2020-03-02 11:34 AM, Grant Youngman wrote:

A maximum around 6 KHz would be better,

Audio response greater than 3 KHz is *never* appropriate for
amateur radio.  Amateur radio is, after all, a communications
service not an entertainment medium.

As a certain FCC official said in a hamfest forum a few  years
ago, "if you want more than 3 KHz, get a *BROADCAST* license."

73,

   ... Joe, W4TV



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Re: [Elecraft] K4 on AM

[Grant Youngman]

smh … :-(

Why did I know this would happen?  Do we really have to keep beating this same 
tired horse? Really?  

Grant NQ5T

> On Mar 2, 2020, at 3:06 PM, Joe Subich, W4TV  wrote:
> 
> On 2020-03-02 11:34 AM, Grant Youngman wrote:
> >
> > A maximum around 6 KHz would be better,
> 
> Audio response greater than 3 KHz is *never* appropriate for
> amateur radio.  Amateur radio is, after all, a communications
> service not an entertainment medium.
> 
> As a certain FCC official said in a hamfest forum a few  years
> ago, "if you want more than 3 KHz, get a *BROADCAST* license."
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 

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Re: [Elecraft] K4 on AM

[Joe Subich, W4TV]

On 2020-03-02 12:13 PM, Jim Brown wrote:

Turned out it was his radio, a $1700 Yaesu FTDX3000.

Yaesu, in particular, "tune" the IF gain of their rigs
too "hot". W8JI has documented the issue as far back as
the FT-1000 and FT-1000MP.  The "hot" IF causes the final
amplifiers to be driven into clipping which is hell on
IMD.

When a user cranks up the low frequency audio EQ on those
rigs and then uses high level of audio processing the
unfiltered (as in after the DSP/IF filter) PA chain
clipping runs wild.

73,

   ... Joe, W4TV


On 2020-03-02 12:13 PM, Jim Brown wrote:

On 3/2/2020 8:34 AM, Grant Youngman wrote:
I know this is a sensitive, if not plain explosive, topic in some 
circles — but most AM users do manage their bandwidth with common 
sense, and to be considerate of the rest of the community.


Not related to AM, but my P3/SVGA sees a LOT of very splattery SSB 
signals generated by low cost JA transceivers. A few weeks ago during a 
contest, I saw it on the signal of a local, fairly new ham, told him 
about it, and volunteered to help him fix it by listening and watching 
as he adjusted drive to his amp. Turned out it was his radio, a $1700 
Yaesu FTDX3000. Splatter from these signals is often as wide on both 
sides of the signal as the signal itself. I measured his splatter as 
less than 20 dB down from his intentional signal.


There's a roundtable that hangs out just above the FT8 slot on 160; most 
of the radios are clean, but there's usually one or two that splatters 
down into FT8.


73, Jim K9YC



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Re: [Elecraft] K4 on AM

[Joe Subich, W4TV]

On 2020-03-02 11:34 AM, Grant Youngman wrote:
>
> A maximum around 6 KHz would be better,

Audio response greater than 3 KHz is *never* appropriate for
amateur radio.  Amateur radio is, after all, a communications
service not an entertainment medium.

As a certain FCC official said in a hamfest forum a few  years
ago, "if you want more than 3 KHz, get a *BROADCAST* license."

73,

   ... Joe, W4TV


On 2020-03-02 11:34 AM, Grant Youngman wrote:

An audio response of 4-5 KHz isn’t unreasonable.  A maximum around 6 KHz would 
be better, and since it will be adjustable, the response (with relatively steep 
rolloff) can be tailored to be compatible with band conditions and occupancy as 
necessary.

I know this is a sensitive, if not plain explosive, topic in some circles — but 
most AM users do manage their bandwidth with common sense, and to be 
considerate of the rest of the community.

Grant NQ5T


On Mar 2, 2020, at 10:46 AM, Eric Swartz  wrote:

One note - Wayne is saying the K4 -audio- b/w in AM will be somewhere
between 4 and 5 kHz.  The actual DSB AM b/w that results will be between 8
and 10 kHz.

73,
Eric
*elecraft.com *





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Re: [Elecraft] Comments from Special Forces personnel on KX2 use

[Don Wilhelm]

Most any wire you put up can be made to radiate.  The problem is 
matching the feedpoint to the feedline.  If you want to use coax for the 
feedline, you must provide a proper matching network at the antenna 
(balun or otherwise).  Open wire line can be used with a matching 
network in the shack.


If you are transmitting at 100 watts (or 10), all that power will go 
into the radiator and be radiated.  If you are concerned about how 
effective that radiation will be consult the antenna books and look at 
the elevation and azimuth radiation patterns to obtain your answers.

L.B. Cebik (SK) did a lot of antenna radiation models.

73,
Don W3FPR

On 3/2/2020 2:13 PM, Fred Jensen wrote:
Folks these days seem to be looking for the perfect [magic?] antenna and 
are reluctant to just try a basic "non-buried conductor" unless it comes 
with the magic guarantee first.  I'm somewhat constrained by our HOA's 
Architectural Review Committee [OK, nothing visible].  My 135' end-fed 
wire along the wooden fence works surprisingly well at 100 W considering 
it is just about eye level all the way.  As good as 5 over 5 over 5 at 
100' on 40?  Not quite, but I can make Q's on any open band anytime I 
want including DXpeditions where I wait a few days until the bruhaha has 
settled down some.



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Re: [Elecraft] K4 on AM

[Adrian]

That's interesting re the FTDX3000. I run a KX3 qrp, and to get 100w 
with KXPA100 w ATU new, I am looking at $2650 (aud) , whereas


I can get a new FTDX3000 for $2000 from the local Yaesu dealer, which 
seems way better value to get 100w operating option.


I know some IMD fussy types that use the FTDX, so on your comments Jim, 
I may have to investigate further.


Thankyou for the info.


Adrian ... vk4tux


On 3/3/20 3:13 am, Jim Brown wrote:

On 3/2/2020 8:34 AM, Grant Youngman wrote:
I know this is a sensitive, if not plain explosive, topic in some 
circles — but most AM users do manage their bandwidth with common 
sense, and to be considerate of the rest of the community.


Not related to AM, but my P3/SVGA sees a LOT of very splattery SSB 
signals generated by low cost JA transceivers. A few weeks ago during 
a contest, I saw it on the signal of a local, fairly new ham, told him 
about it, and volunteered to help him fix it by listening and watching 
as he adjusted drive to his amp. Turned out it was his radio, a $1700 
Yaesu FTDX3000. Splatter from these signals is often as wide on both 
sides of the signal as the signal itself. I measured his splatter as 
less than 20 dB down from his intentional signal.


There's a roundtable that hangs out just above the FT8 slot on 160; 
most of the radios are clean, but there's usually one or two that 
splatters down into FT8.


73, Jim K9YC


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Re: [Elecraft] Comments from Special Forces personnel on KX2 use

[Fred Jensen]

Thanks for sharing this Wayne.  That was our experience in SE Asia in 
the 60's too, sans KX2 of course.  If we could get the dipole 6-10' 
high, we were good for both the day and night in-country nets and could 
also work our HQ & Maintenance Depot at Clark AB in the Philippines 24 
hrs.  The problem with a 6' dipole was clotheslining a trooper in the 
middle of the night. [:=)


Folks these days seem to be looking for the perfect [magic?] antenna and 
are reluctant to just try a basic "non-buried conductor" unless it comes 
with the magic guarantee first.  I'm somewhat constrained by our HOA's 
Architectural Review Committee [OK, nothing visible].  My 135' end-fed 
wire along the wooden fence works surprisingly well at 100 W considering 
it is just about eye level all the way.  As good as 5 over 5 over 5 at 
100' on 40?  Not quite, but I can make Q's on any open band anytime I 
want including DXpeditions where I wait a few days until the bruhaha has 
settled down some.


Antennas are one of the last radio neighborhoods for the average ham to 
experiment with, homebrew transmitters and receivers are rare these 
days.  It often could take less time to just "try something" as an 
antenna than it takes for the endless arguments on email lists on what 
works and how well.


73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 3/2/2020 6:52 AM, Wayne Burdick wrote:

Hi all,

I forwarded a few questions from HF Pack list members to a Special Forces 
commander whose unit has been using KX2s in the field for three years. He 
passed along the following additional comments:



"We prefer to use Off Center Fed Dipoles (OCFD). They work for us because they 
present a consistent, predictable mismatch on the frequencies we use. I made a few 
small baluns out of binocular cores that are 4:1, which handle the output of the KX2 
on Voice, CW and digital all day long. Typically the dipoles are strung up 
arms-reach-high in the field, which gives us easy 300 - 400 mile range in our KX2 
nets. If we're fortunate enough to have a tree, that OCFD with a center height at 10 
to 15 feet or so works perfect for NVIS, at least for us.

"You'd be proud to know my KX2 has survived remote jungles, 14-er peaks in Colorado, 
-30 degree F temps, a helicopter crash, and gunfights / IED blasts   I think the 
radio has held up better than I have."



He closed with:

"Feel free to hit me up with any additional questions from the gang and I'll do my 
best to answer."

73,
Wayne
N6KR



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Re: [Elecraft] Comments from Special Forces personnel on KX2 use

[Robert G Strickland via Elecraft]

One such letter cancels a year of gripes. Be proud, Elecraft.

...robert KE2WY

On 3/2/2020 14:52, Wayne Burdick wrote:

Hi all,

I forwarded a few questions from HF Pack list members to a Special Forces 
commander whose unit has been using KX2s in the field for three years. He 
passed along the following additional comments:



"We prefer to use Off Center Fed Dipoles (OCFD). They work for us because they 
present a consistent, predictable mismatch on the frequencies we use. I made a few 
small baluns out of binocular cores that are 4:1, which handle the output of the KX2 
on Voice, CW and digital all day long. Typically the dipoles are strung up 
arms-reach-high in the field, which gives us easy 300 - 400 mile range in our KX2 
nets. If we're fortunate enough to have a tree, that OCFD with a center height at 10 
to 15 feet or so works perfect for NVIS, at least for us.

"You'd be proud to know my KX2 has survived remote jungles, 14-er peaks in Colorado, 
-30 degree F temps, a helicopter crash, and gunfights / IED blasts   I think the 
radio has held up better than I have."



He closed with:

"Feel free to hit me up with any additional questions from the gang and I'll do my 
best to answer."

73,
Wayne
N6KR


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--
Robert G Strickland, PhD ABPH - KE2WY
rc...@verizon.net.usa
Syracuse, New York, USA
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[Elecraft] F.S. PX3

[Joseph Trombino Jr]

The PX3 listed earlier for sale has been sold.

73, Joe W2KJ
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Re: [Elecraft] K4 on AM

[W2xj]

Sounds like there might be a sample rate issue. 

Sent from my iPad

> On Mar 2, 2020, at 10:47 AM, Eric Swartz  wrote:
> 
> One note - Wayne is saying the K4 -audio- b/w in AM will be somewhere
> between 4 and 5 kHz.  The actual DSB AM b/w that results will be between 8
> and 10 kHz.
> 
> 73,
> Eric
> *elecraft.com *
> 
> 
>> On Fri, Feb 28, 2020 at 4:31 PM W2xj  wrote:
>> 
>> am should go to at least 6 KHz or be totally unrestricted.
>> 
>> Sent from my iPad
>> 
 On Feb 28, 2020, at 7:27 PM, Wayne Burdick  wrote:
>>> 
>>> Hi Grant,
>>> 
>>> The K4 will allow independent setting of TX bandwidth for voice and
>> audio data modes up to something in excess of 4 kHz. SSB, ESSB, AM, and
>> audio data will each have their own setting.
>>> 
>>> As with the K3S, it'll be up to the user to judge whether the use of
>> wider bandwidths is acceptable under the given operating conditions. This
>> subject will be discussed in the owner's manual.
>>> 
>>> Wayne
>>> N6KR
>>> 
>>> 
 On Feb 28, 2020, at 1:48 PM, Grant Youngman 
>> wrote:
 
 One key spec we haven’t heard anything about yet is the transmit
>> bandwidth capability of the K4 on AM.  I certainly hope the design options
>> substantially exceed the rather poor and restricted transmit bandwidth of
>> the K3, and that there aren’t any unnecessary artificial “political”
>> restrictions.  It would seem that the K4, like the Flex radios for example,
>> should be capable of providing outstanding, clean, AM transmit performance
>> with adjustable transmit audio bandwidth to suit conditions, etc.
 
 Grant NQ5T
>>> 
>>> 
>>> __
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>>> 
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>>> Message delivered to w...@w2xj.net
>> 
>> __
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Re: [Elecraft] Comments from Special Forces personnel on KX2 use

[ockmrzr]

As we Vets say,  F**K'n-A!

73 de Bruce, N7TY
Yuma, AZ
www.qsl.net/n7ty

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Wayne Burdick
Sent: 2 March, 2020 07:53
To: Elecraft Reflector 
Subject: [Elecraft] Comments from Special Forces personnel on KX2 use

Hi all,

I forwarded a few questions from HF Pack list members to a Special Forces
commander whose unit has been using KX2s in the field for three years. He
passed along the following additional comments:



"We prefer to use Off Center Fed Dipoles (OCFD). They work for us because
they present a consistent, predictable mismatch on the frequencies we use. I
made a few small baluns out of binocular cores that are 4:1, which handle
the output of the KX2 on Voice, CW and digital all day long. Typically the
dipoles are strung up arms-reach-high in the field, which gives us easy 300
- 400 mile range in our KX2 nets. If we're fortunate enough to have a tree,
that OCFD with a center height at 10 to 15 feet or so works perfect for
NVIS, at least for us.  

"You'd be proud to know my KX2 has survived remote jungles, 14-er peaks in
Colorado, -30 degree F temps, a helicopter crash, and gunfights / IED blasts
  I think the radio has held up better than I have."



He closed with:

"Feel free to hit me up with any additional questions from the gang and I'll
do my best to answer."

73,
Wayne
N6KR


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delivered to ockm...@gmail.com 

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Re: [Elecraft] K4 on AM

[Jim Brown]

On 3/2/2020 8:34 AM, Grant Youngman wrote:

I know this is a sensitive, if not plain explosive, topic in some circles — but 
most AM users do manage their bandwidth with common sense, and to be 
considerate of the rest of the community.


Not related to AM, but my P3/SVGA sees a LOT of very splattery SSB 
signals generated by low cost JA transceivers. A few weeks ago during a 
contest, I saw it on the signal of a local, fairly new ham, told him 
about it, and volunteered to help him fix it by listening and watching 
as he adjusted drive to his amp. Turned out it was his radio, a $1700 
Yaesu FTDX3000. Splatter from these signals is often as wide on both 
sides of the signal as the signal itself. I measured his splatter as 
less than 20 dB down from his intentional signal.


There's a roundtable that hangs out just above the FT8 slot on 160; most 
of the radios are clean, but there's usually one or two that splatters 
down into FT8.


73, Jim K9YC
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[Elecraft] F.S. KX3 line

[Joseph Trombino Jr]

Howdy Gang.

The KX3 and KXPA100 have been spoken for.

The PX3 is available for $525 shipped.

Keep sending those ditties.

73, Joe W2KJ
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Re: [Elecraft] K4 on AM

[Grant Youngman]

An audio response of 4-5 KHz isn’t unreasonable.  A maximum around 6 KHz would 
be better, and since it will be adjustable, the response (with relatively steep 
rolloff) can be tailored to be compatible with band conditions and occupancy as 
necessary.

I know this is a sensitive, if not plain explosive, topic in some circles — but 
most AM users do manage their bandwidth with common sense, and to be 
considerate of the rest of the community.

Grant NQ5T

> On Mar 2, 2020, at 10:46 AM, Eric Swartz  wrote:
> 
> One note - Wayne is saying the K4 -audio- b/w in AM will be somewhere
> between 4 and 5 kHz.  The actual DSB AM b/w that results will be between 8
> and 10 kHz.
> 
> 73,
> Eric
> *elecraft.com *
> 
> 

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Re: [Elecraft] Elecraft KX-3 Serial Numbers To Date ...

[W1WBL]

Hi, any chance of getting a history of serial Number 1798?



--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] K4 on AM

[Eric Swartz]

One note - Wayne is saying the K4 -audio- b/w in AM will be somewhere
between 4 and 5 kHz.  The actual DSB AM b/w that results will be between 8
and 10 kHz.

73,
Eric
*elecraft.com *


On Fri, Feb 28, 2020 at 4:31 PM W2xj  wrote:

> am should go to at least 6 KHz or be totally unrestricted.
>
> Sent from my iPad
>
> > On Feb 28, 2020, at 7:27 PM, Wayne Burdick  wrote:
> >
> > Hi Grant,
> >
> > The K4 will allow independent setting of TX bandwidth for voice and
> audio data modes up to something in excess of 4 kHz. SSB, ESSB, AM, and
> audio data will each have their own setting.
> >
> > As with the K3S, it'll be up to the user to judge whether the use of
> wider bandwidths is acceptable under the given operating conditions. This
> subject will be discussed in the owner's manual.
> >
> > Wayne
> > N6KR
> >
> >
> >> On Feb 28, 2020, at 1:48 PM, Grant Youngman 
> wrote:
> >>
> >> One key spec we haven’t heard anything about yet is the transmit
> bandwidth capability of the K4 on AM.  I certainly hope the design options
> substantially exceed the rather poor and restricted transmit bandwidth of
> the K3, and that there aren’t any unnecessary artificial “political”
> restrictions.  It would seem that the K4, like the Flex radios for example,
> should be capable of providing outstanding, clean, AM transmit performance
> with adjustable transmit audio bandwidth to suit conditions, etc.
> >>
> >> Grant NQ5T
> >
> >
> > __
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[Elecraft] Comments from Special Forces personnel on KX2 use

[Wayne Burdick]

Hi all,

I forwarded a few questions from HF Pack list members to a Special Forces 
commander whose unit has been using KX2s in the field for three years. He 
passed along the following additional comments:



"We prefer to use Off Center Fed Dipoles (OCFD). They work for us because they 
present a consistent, predictable mismatch on the frequencies we use. I made a 
few small baluns out of binocular cores that are 4:1, which handle the output 
of the KX2 on Voice, CW and digital all day long. Typically the dipoles are 
strung up arms-reach-high in the field, which gives us easy 300 - 400 mile 
range in our KX2 nets. If we're fortunate enough to have a tree, that OCFD with 
a center height at 10 to 15 feet or so works perfect for NVIS, at least for us. 
 

"You'd be proud to know my KX2 has survived remote jungles, 14-er peaks in 
Colorado, -30 degree F temps, a helicopter crash, and gunfights / IED blasts 
  I think the radio has held up better than I have."



He closed with:

"Feel free to hit me up with any additional questions from the gang and I'll do 
my best to answer."

73,
Wayne
N6KR


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