date:20220305

[Elecraft] Elecraft CW Net Announcement

2022-03-05 Thread kevin


Good Evening,

   After a rainy week today's sun felt good.  Buds are starting to 
expand.  Daffodils are about four inches tall, just in time for the next 
snow storm due late in the week.  There was one day of fog and snow.  It 
was like a Turner painting in shades of gray.


   The sun is active.  We are in the middle of an ion stream. Signals 
are OK but noise is high.  The stream should still be present tomorrow.  
The ionosphere is charged up.  I expect signals to bounce well with 
moderate to heavier QSB.  Forty meters could get noisy as the sun sets.



Please join us on (or near):

14050 kHz at 2300z Sunday  (3 PM PST Sunday)
 7047 kHz at 0030z Monday  (4:30 PM PST Sunday)

   73,
  Kevin. KD5ONS




-


I wanted to see what happens when you feed a sine wave into a doublet.  
This code snippet inserts the signal at the center feed point and walks 
it outward at each time step.  When the signal hits the end of the wire 
it bounces back, adding its level to the incoming level.


I used degrees to measure the length of the antenna.  One half of a wave 
is 180 degrees long (pi).  A half wave dipole has two legs each 1/4 
wavelength long or 90 degrees.  When each leg is 90 or 180 degrees long 
the antenna behaves as expected at resonance. Shorter or longer legs 
display their odd behaviors.  Some day I will add a user interface which 
does not require me to recompile the code.



static int step = 1;
int s = 0;        // sine[] index
bool flag = false;   // speed flag

DWORD WINAPI wave( LPVOID pV )            // working function
    {
    int k;
    RECT rct;
    int xS, yS;                                    // screen coordinates
    int dx = 1;
    int centerLine = HEIGHT/2;

    while(TRUE)              // City on the edge of forever
    {
    if (flag)
        {
        SleepEx( 3, FALSE );                // Passing the time, 
drinking good wine

        }
    else
        {
        SleepEx( 40, FALSE );           // Scalosians slow to human 
speeds

        }

    hdc = GetDC(hwnd);
    SelectObject(bkhdc, bkBitmap);    // create cool background gray
    GetClientRect(hwnd, &rct);
    FillRect(bkhdc, &rct, cBrush);    // paint background

    // shift each element[] value up/out the antenna
    shift();

    //    at each time step fill the feed point from the sine[] buffer
    element[0] = sine[s];

    // step through sine[]
    s += step;
    if (s > 359)
        {
        s = 0;
        flag = true;    // sleep less
        }

    // sum outgoing element with incoming element
    sum();

    // fill display on both legs
    for (int e=0; e        k = 255 + (int) (0.6 * display[i].level);  // determine 
color index

        SelectObject(bkhdc, pn[k].pen );  // choose appropriate pen

        xS = Xtransform(0, WINDOWX, 10, WIDTH/2, i * dx + 50 );
        yS = Ytransform(WINDOWY, 0, 10, HEIGHT, display[i].level + 
centerLine);

        MoveToEx(bkhdc, xS, yS, NULL);
        MoveToEx(hdc, xS, yS, NULL);

        xS = Xtransform(0, WINDOWX, 10, WIDTH/2, i * dx + 50 );
        yS = Ytransform(WINDOWY, 0, 10, HEIGHT, centerLine );
        LineTo(bkhdc, xS, yS);
        LineTo(hdc, xS, yS);
        }

    for (int i=LENGTH; i<2*LENGTH; i++)        // right leg
        {
        k = 255 + (int) (0.6 * display[i].level);
        SelectObject(bkhdc, pn[k].pen );

        xS = Xtransform(0, WINDOWX, 10, WIDTH/2, i * dx + 55 );
        yS = Ytransform(WINDOWY, 0, 10, HEIGHT, display[i].level + 
centerLine  );

        MoveToEx(bkhdc, xS, yS, NULL);
        MoveToEx(hdc, xS, yS, NULL);

        xS = Xtransform(0, WINDOWX, 10, WIDTH/2, i * dx + 55);
        yS = Ytransform(WINDOWY, 0, 10, HEIGHT, centerLine );
        LineTo(bkhdc, xS, yS);
        LineTo(hdc, xS, yS);
        }

//        SelectObject(bkhdc, GetStockObject(BLACK_PEN));
    ReleaseDC(hwnd, hdc);
    InvalidateRect(hwnd, NULL, TRUE);        // force WM_PAINT
    }
    ExitProcess( 0 );
   return 0;
   }


I will post the files, make file, and an exe on my web site.  It is fun 
to see what happens with non-resonant lengths.


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Re: [Elecraft] Elecraft K4 Vs. Flex 6400

2022-03-05 Thread Kurt Pawlikowski


Scott,

    Well, yes: The "numbers" say one thing (or several things!), but, 
like I said, I'm in love with Elecraft... So, yes, I'm prejudiced! Of 
course the "top radio (FT-DX101D)" is somewhat more expensive then the 
6400, and does seem to have some nice whistles and bells. Who knows? 
Maybe I'll do a switch to Yaesu... {'-)


    k WB9FMC

On 3/5/22 18:46, Scott Manthe wrote:
Actually, the Yaesu FTDX101D/MP has the best receiver numbers on 
Sherwood's list. That doesn't mean that it's the best radio for you, 
but the Flex and the K4 aren't "far and away" better receivers than 
anything else in the amateur market. Ironically, Rob seems to really 
like Icoms...


73,
Scott N9AA



On 3/5/22 7:26 PM, Kurt Pawlikowski wrote:

Rich, Et Al,

    Thanks for the comments.

    Yes, I'm aware that this might bring up some sort of issues 
people have with the manufactures or personal experience. My own is 
that when I was ordering the radio, I could afford the 6400. But what 
I was hoping for, maybe in vain, is some information about how the 
rigs perform comparatively. I know that either of them are 
far-and-away better receivers than anything else on the amateur market.


    I my situation, I'm up against a lot of noise (live in a condo). 
The Flex seems to mitigate some of that. I was hoping that the K4 
would be at least comparable.


    CW delay: Well, I wired my key and headphones directly to the 
Flex. My control PC would be way too slow to operate CW through it.


    Well, I'm not sure which way to go at this time. I like the Flex, 
but I'm "in-love" with Elecraft! Just wish I had a more experiential 
based opinion to consider!


    Thanks all for your comments! I'll keep my eye on this thread...

    k WB9FMC





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Re: [Elecraft] Elecraft K4 Vs. Flex 6400

2022-03-05 Thread Kurt Pawlikowski


Rich, Et Al,

    Thanks for the comments.

    Yes, I'm aware that this might bring up some sort of issues people 
have with the manufactures or personal experience. My own is that when I 
was ordering the radio, I could afford the 6400. But what I was hoping 
for, maybe in vain, is some information about how the rigs perform 
comparatively. I know that either of them are far-and-away better 
receivers than anything else on the amateur market.


    I my situation, I'm up against a lot of noise (live in a condo). 
The Flex seems to mitigate some of that. I was hoping that the K4 would 
be at least comparable.


    CW delay: Well, I wired my key and headphones directly to the Flex. 
My control PC would be way too slow to operate CW through it.


    Well, I'm not sure which way to go at this time. I like the Flex, 
but I'm "in-love" with Elecraft! Just wish I had a more experiential 
based opinion to consider!


    Thanks all for your comments! I'll keep my eye on this thread...

    k WB9FMC


On 3/5/22 11:58, Rich Lim wrote:
Hi Kurt, I figured I would reply to you directly as this topic is 
controversial and may get some people’s undies in a bunch!. I have a 
flex 6480 and entire stable of Elecraft rigs from K-1 all the way to 
K3. My K4 is on order and hopefully will be here by the summer.  In my 
estimation, the flex 6400 is a great radio no doubt about it, receiver 
is excellent and as a plus I can work FT8 remotely from work!


The only thing I have bad to say about the flex is that being a CW OP, 
there is a big delay between keying the rig and transmit such that it 
throws me off dramatically in my sending. I’ve resorted to using an 
external keyer otherwise I really can’t work CW aiding the radio 
keyer. Furthermore, it may or may not be a downside to you, but using 
a computer to control all the rig functions to me is less than ideal. 
 I like knobs and a spinning VFO wheel, sure the flex has Maestro but 
who knows when and if that we’ll ever be released.


As far as performance, there is nothing that I could hear on the flex 
that I cannot hear on the K3. I’m contest situations, I think the K 
line has an advantage since you can add crystal filters in the 
superhet stage and prevent receiver overload from nearby stations. 
This would be most important if you are a CW or RTTY operator.


You may want to consider taking a listen to the latest Ham Radio 
Workbench Podcast. Rob Sherwood talks about his receiver list and 
specifically mentions the flex series of radios and Elecraft rigs. 
Bottom line is any of the top 20 radios on his list will work 
fantastic, only if you’re a heavy contester will you notice a difference.


I also has a Yaesu in FTDX 10 and while that radio has a great 
receiver in great DSP, the ergonomics are not great and CW is tedious 
as you cannot run for QSK. I think the bottom line is what you’re most 
comfortable with in terms of  their ergonomics is going to be the most 
important factor unless you are a big time contest operator.


Finally, I’m happy to support both of these companies as they are the 
only two remaining large American ham radio companies. If either go 
down the tube, who is going to push the big three to continue to 
innovate?. I hope this helps you a little bit, and if you wish to 
discuss it further more than happy to do so and feel free to email me 
directly. Take care!

Rich
KQ9L
Sent from Yahoo Mail for iPhone 



On Saturday, March 5, 2022, 12:15 AM, Kurt Pawlikowski 
 wrote:


Hi!

    I was wondering whether there is anyone who has done a
side-by-side
comparison between the K4 and the Flex 6400 or any other Flex
"direct to
digital" radio?

    Background: As it happens, I purchased a 6400, which I received
about 9 months ago. I use it with a computer, but I had ordered a
Maestro when I ordered the 6400. Unfortunately, the Maestro is
still on
back-order and will be until some time next year. When I checked with
Elecraft, they said the delay time for a K4 was about 6 months (no, I
won't hold them to that!). So, I'm wondering if it would be worth
jumping to the K4. Mind you, I'm not unhappy with the Flex and,
when I
ordered it I had considered a K4, but it was outside my budget at
that
time. I'm rethinking that decision. Also, I've been an Elecraft
fan for
quite some time. At any rate, I'd like some opinions from
experience and
the only ones I have seen were written before the K4 was
available. So,
a little help would be appreciated! Thanks!

    k WB9FMC

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Re: [Elecraft] SM$ command

2022-03-05 Thread Stefan Jansen

Hi Andy,

Yes, I should have been more precise in asking my question. OK, thanks to your 
answer I know now that the SM$ command might report exactly the number of dots 
that are displayed on the KX2 for the S-Meter. But as I am a white sticker, I 
cannot read that display and do not know to which S-meter values the dots 
correspond unless it is written in the programmer’s reference. And there they 
only tell the values for 6, 9, 12, and 15, but not for the other values.

So if anybody can help, I would be glad.


Vy 73 de Stefan, DK7STJ

--
Stefan Jansen***E-Mail: dk7...@darc.de

> Am 28.02.2022 um 18:43 schrieb Andy Durbin :
> 
> Don't have a KX2 but Kenwood meter interrogations return the result as "dots" 
> corresponding to the number of dots that are "lit" on the LCD meter scale.
> 
> If the KX2 uses an LCD meter it's likely the same.
> 
> Andy, k3wyc
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Re: [Elecraft] FW: KPA500 faults

2022-03-05 Thread Charles K0MV


Hi William,

"

surmise it was heating

"

Consider as the surface mount current sensing resistor (assuming it is 
surface mount)


is made to withstand solder reflow it seems unlikely to be heat. I've 
had many surface


mount resistors develop hair line cracks due to vibration and board 
flexing (in breadboards I built).


In failures I've seen due to heat, the resistor visibly changes color 
especially in markings, white to


brown.

As long as you have the unit opened up, perhaps you should take a lupe 
or magnifying glass, bright


flashlight and just look around for other cracks in components or solder 
joints.



I hope I can work you on 40M FT8, I need VP2E.


Good luck

Chuck K0MV


On 3/3/22 08:40, Dr. William J. Schmidt wrote:

Sorry guys, this is not a trivial line voltage problem.

The 60V line to the PA does not sag that much (starts at 72V goes to 60V
under FULL LOAD as measured at the PA)... it's in the voltage divider for
the 60V/32 line or the connectors that carry it to the front panel processor
for digitizing.  Changes with heat load.  This amp is in the Caribbean and
there is plenty of excess heat and corrosion. (nb. I just replaced the
current sensing resistor in my K3S for the 100W module due to a hair-line
crack... surmise it was heating).


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
VP2EHZ

email:  b...@wjschmidt.com


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Naumann, Robert, W5OV
Sent: Thursday, March 3, 2022 9:11 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] FW: KPA500 faults


What line voltage are you running it on?  If you're not on 240v, switching
to 240v would be the easiest and most effective improvement.

Doing so yields a 4:1 improvement in line voltage regulation / reduction in
voltage drop.  Double the voltage, at half the current draw.

73,

Bob W5OV

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Dr. William J. Schmidt
Sent: Thursday, March 3, 2022 00:39
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA500 faults

I have a KPA500 that faults on low (60 VDC) voltage.  After measuring the
power supply voltage at the PA module is perfectly fine.  The voltage read
by the processor on the front panel via pin 10 of P1 is lower than it should
be and hence the fault condition.  I suspect there is a voltage divider on
the LPF board that drops the 60 VDC to something that the processor can read
and digitize (in the 0 to 3-5 volt range).  The set of schematics I have do
not show the voltage divider anywhere. does anyone have this part of the
schematics for the KPA500 so that I can adequately troubleshoot this amp and
get it on the air for the contest this weekend?   Multiple notes to Elecraft
have gone unanswered.

  

  


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
VP2EHZ

  

  


email:    b...@wjschmidt.com

  

  


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--
Charles K0MV
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Re: [Elecraft] Elecraft K4 Vs. Flex 6400

2022-03-05 Thread Brian Denley

The 6400 is $2000.  

Brian
KB1VBF
Sent from my iPad

> On Mar 5, 2022, at 10:52 AM, Pete Smith N4ZR  wrote:
> 
> Interesting question. The Flex 6700 is close to the top of the list with 
> some sort of updated hardware, while the 6400 is below the original K3, and 
> far below the K3 with the new synthesizer(s).  The difference between the 
> 6700 and  the K3 with new synth is only 1 dB in terms of narrow spaced 
> dynamic range.  Another data-point in favor of holding on to my K3.
> 
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at .
> For spots, please use your favorite
> "retail" DX cluster.
> 
>> On 3/5/2022 9:00 AM, Ian Kahn wrote:
>> Kurt,
>> 
>> A good starting point would be Rob Sherwood's receiver analysis. It can be
>> found at:
>> 
>> http://www.sherweng.com/table.html
>> 
>> I'm not sure/aware of anyone who performed direct transmitter comparisons.
>> 
>> 73 de,
>> 
>> Ian, NV4C
>> 
>>> On Sat, Mar 5, 2022 at 1:19 AM Kurt Pawlikowski  wrote:
>>> 
>>> Hi!
>>> 
>>>  I was wondering whether there is anyone who has done a side-by-side
>>> comparison between the K4 and the Flex 6400 or any other Flex "direct to
>>> digital" radio?
>>> 
>>>  Background: As it happens, I purchased a 6400, which I received
>>> about 9 months ago. I use it with a computer, but I had ordered a
>>> Maestro when I ordered the 6400. Unfortunately, the Maestro is still on
>>> back-order and will be until some time next year. When I checked with
>>> Elecraft, they said the delay time for a K4 was about 6 months (no, I
>>> won't hold them to that!). So, I'm wondering if it would be worth
>>> jumping to the K4. Mind you, I'm not unhappy with the Flex and, when I
>>> ordered it I had considered a K4, but it was outside my budget at that
>>> time. I'm rethinking that decision. Also, I've been an Elecraft fan for
>>> quite some time. At any rate, I'd like some opinions from experience and
>>> the only ones I have seen were written before the K4 was available. So,
>>> a little help would be appreciated! Thanks!
>>> 
>>>  k WB9FMC
>>> 
>>> __
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>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
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>>> 
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to nv4c@gmail.com
>> 
>> 
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[Elecraft] Overload concern between a K3 and a K4 using Alpha Delta Coax Delta-4 Switches

2022-03-05 Thread Rocky Cookus

Hello,

I've got the Alpha Deltas connected together in the COM position so that I
can use any radio with any antenna.

With the K3 on 40 and the K4 on 20, I see nothing on the Panadapter of the
K4 while doing an ATU tune on the K3 or even key down putting out 100 watts.

The Delta-4 switches  are rated at 1500 watts, and I run no more than 500
watts.

Conventional wisdom seems to say no problemo as long as both radios are not
on the same band.

Most grateful to hear from anyone using this setup.

Rocky, AE7US
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Re: [Elecraft] Elecraft K4 Vs. Flex 6400

2022-03-05 Thread Pete Smith N4ZR

Interesting question. The Flex 6700 is close to the top of the list with 
some sort of updated hardware, while the 6400 is below the original K3, 
and far below the K3 with the new synthesizer(s).  The difference 
between the 6700 and  the K3 with new synth is only 1 dB in terms of 
narrow spaced dynamic range.  Another data-point in favor of holding on 
to my K3.


73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.

On 3/5/2022 9:00 AM, Ian Kahn wrote:

Kurt,

A good starting point would be Rob Sherwood's receiver analysis. It can be
found at:

http://www.sherweng.com/table.html

I'm not sure/aware of anyone who performed direct transmitter comparisons.

73 de,

Ian, NV4C

On Sat, Mar 5, 2022 at 1:19 AM Kurt Pawlikowski  wrote:


Hi!

  I was wondering whether there is anyone who has done a side-by-side
comparison between the K4 and the Flex 6400 or any other Flex "direct to
digital" radio?

  Background: As it happens, I purchased a 6400, which I received
about 9 months ago. I use it with a computer, but I had ordered a
Maestro when I ordered the 6400. Unfortunately, the Maestro is still on
back-order and will be until some time next year. When I checked with
Elecraft, they said the delay time for a K4 was about 6 months (no, I
won't hold them to that!). So, I'm wondering if it would be worth
jumping to the K4. Mind you, I'm not unhappy with the Flex and, when I
ordered it I had considered a K4, but it was outside my budget at that
time. I'm rethinking that decision. Also, I've been an Elecraft fan for
quite some time. At any rate, I'd like some opinions from experience and
the only ones I have seen were written before the K4 was available. So,
a little help would be appreciated! Thanks!

  k WB9FMC

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[Elecraft] Looking for KFL1-2 or KFL1-4 built or unbuilt

2022-03-05 Thread Vicenç via Elecraft

Hi to all the subscribers

A good friend of mine bought recently an unbuilt K1 kit but unfortunately
missing some relevant bits.
The kit had the bare K1 enclosure and, unfortunately  the band board module
was missing. After doing the inventory, thr RF board and front panel board
components were all there.
I wonder if someone in this list might have a 2 or 4 bans board built or
unbuilt surplus to his needs or even a bare pcb. Elecraft still supplies
the components for 30, 40 and 80m bands.
If someone would have an extra front panel, it would be perfect.
I wonder if the Gerber files for the 2 and 4 bands pcbs are available or
can be obtained somewhere.
Thanks in advance for the replies.

72/73 de Vicenç, EA3ADV
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Re: [Elecraft] Elecraft K4 Vs. Flex 6400

2022-03-05 Thread John Simmons


Take a listen to Rob Sherwood talk about the K4:
https://www.hamradioworkbench.com/podcast/hrwb-149-receiver-performance-with-rob-sherwood


--
73,
-de "Curly" John NI0K in rural Debs, MN USA
Hamshack Hotline: 610271

Ian Kahn wrote on 3/5/2022 8:00 AM:

Kurt,

A good starting point would be Rob Sherwood's receiver analysis. It can be
found at:

http://www.sherweng.com/table.html

I'm not sure/aware of anyone who performed direct transmitter comparisons.

73 de,

Ian, NV4C

On Sat, Mar 5, 2022 at 1:19 AM Kurt Pawlikowski  wrote:


Hi!

  I was wondering whether there is anyone who has done a side-by-side
comparison between the K4 and the Flex 6400 or any other Flex "direct to
digital" radio?

  Background: As it happens, I purchased a 6400, which I received
about 9 months ago. I use it with a computer, but I had ordered a
Maestro when I ordered the 6400. Unfortunately, the Maestro is still on
back-order and will be until some time next year. When I checked with
Elecraft, they said the delay time for a K4 was about 6 months (no, I
won't hold them to that!). So, I'm wondering if it would be worth
jumping to the K4. Mind you, I'm not unhappy with the Flex and, when I
ordered it I had considered a K4, but it was outside my budget at that
time. I'm rethinking that decision. Also, I've been an Elecraft fan for
quite some time. At any rate, I'd like some opinions from experience and
the only ones I have seen were written before the K4 was available. So,
a little help would be appreciated! Thanks!

  k WB9FMC

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Re: [Elecraft] Elecraft K4 Vs. Flex 6400

2022-03-05 Thread Ian Kahn

Kurt,

A good starting point would be Rob Sherwood's receiver analysis. It can be
found at:

http://www.sherweng.com/table.html

I'm not sure/aware of anyone who performed direct transmitter comparisons.

73 de,

Ian, NV4C

On Sat, Mar 5, 2022 at 1:19 AM Kurt Pawlikowski  wrote:

> Hi!
>
>  I was wondering whether there is anyone who has done a side-by-side
> comparison between the K4 and the Flex 6400 or any other Flex "direct to
> digital" radio?
>
>  Background: As it happens, I purchased a 6400, which I received
> about 9 months ago. I use it with a computer, but I had ordered a
> Maestro when I ordered the 6400. Unfortunately, the Maestro is still on
> back-order and will be until some time next year. When I checked with
> Elecraft, they said the delay time for a K4 was about 6 months (no, I
> won't hold them to that!). So, I'm wondering if it would be worth
> jumping to the K4. Mind you, I'm not unhappy with the Flex and, when I
> ordered it I had considered a K4, but it was outside my budget at that
> time. I'm rethinking that decision. Also, I've been an Elecraft fan for
> quite some time. At any rate, I'd like some opinions from experience and
> the only ones I have seen were written before the K4 was available. So,
> a little help would be appreciated! Thanks!
>
>  k WB9FMC
>
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> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to nv4c@gmail.com



-- 
Ian Kahn, NV4C
Roswell, GA  EM74ua
nv4c@gmail.com
10-10 #74624  North Georgia Chapter #2038
PODXS 070 #1962
K3 #281, P3 #688 KAT500 #860, KPA500 #1468
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[Elecraft] [K3S] LO-CUT-HI

2022-03-05 Thread Jim McDonald

I haven't used my filter passband controls on SSB in my K3S for a long time.  I 
can't switch the function of the shift and width controls to lo and hi cut by 
tapping on them with the radio in LSB or USB.  They stay on SHIFT and WIDTH.

Am I forgetting something?


Jim N7US


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Re: [Elecraft] K3 to K4D “Upgrade”: Satisfied?

2022-03-05 Thread Dave

Last year I saw our UK distributor was advertising that the K4 was
available from them with a 6 to 8 week delivery. I suspect they may have
had some on “pre order”. I managed to sell my K3/P3, and took delivery of a
K4D in just under 8 weeks from ordering.

I wasn’t able to conduct an A/B comparison between the K3 and K4 as I sold
the K3 privately first.

I am mostly a CW operator and find the bandwidths right down to 50 or 100
Hz on the K4 are much clearer than they were on the K3. With the K3 I had
250 and 400 Hz filters in the main RX and 400 Hz in the sub, I tended to
use 300 to 400 Hz b/w and accepted the additional noise on the lower bands,
narrower bandwidths generally didn’t often sound good on my K3.

Receive audio on the K4 is a lot smoother than the K3 and the noise
reduction works well without the messing around you had with the K3. Noise
reduction on the K3 doesn’t work properly regardless of how much you play
around with the settings.

Being a full SDR, on data modes the power (and audio drive level) doesn’t
vary across the passband. On FT8 the K3 required adjustment as you changed
TX tone frequency, not that I am a fan of FT8 but have used it an odd time.

On a K4 you have three serial ports that are isolated from each other, so
you can run data with rig control via one program and have a separate
program read the frequency to log it without any conflict.

With a sub receiver fitted to a K3 you hard wired it to use the main
antenna, or a separate rear panel socket. Changing the config involved
quite a bit of dismantling. You just press a front panel button on the K4D…

My original K3 needed an external preamp on 6m, the K4 is much more
sensitive.

The spectrum display was OK on the P3, but the K4 with the auto level works
great and you generally don’t need to change the reference level. If you
want to impress visitors, hook up a 40 inch 4K TV via HDMI, the display is
stunning but IMO not practical in most shacks.

The jack sockets on the K4 are much better quality and a tighter fit than
the K3.

For SSB the K4 is getting controlled envelope SSB in the next firmware
release which is a big improvement compared to conventional compression.

There has been much discussion about the K4HD version, but as Wayne said,
few are likely to need the added expense of crystal roofing filters. OK,
you will get a receiver that is placed higher on the Rob Sherwood list, but
that only sometimes may make a difference if you have nearby ham neighbours
in the same CW contest. In my case, I haven’t experienced any problems with
adjacent signals with my K4D. In the past I couldn’t approach within 30 or
40 KHz of a QRO neighbour (just under 2 miles away) on 80m CW with my K3.
Unfortunately he sadly went SK some time ago, so I cannot really say if my
K4D would have been any worse… don’t assume a K4HD will necessarily allow
you to operate close to nearby QRO stations in your neighbourhood.

A K3S with sub RX, P3, DVR, external reference, P3 external monitor board,
etc. cost more in 2017 than a K4D does today. Use the Wayback machine to
check out those K3 prices.

73 Dave G4AON
K4D #286
KPA500


-- 
Sent from my iPhone SE
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