Re: [Elecraft] K3 AF Upgrade Kit (for speaker amplifier and LINE OUTs)

[Val]

wayne burdick wrote:


SPEAKER AMP:  The mod kit includes a very low-resistance RF choke for 
use at RFC47

73,
Wayne
N6KR


What is the value?   / SM2EKM


Could this be homebrewed? Core, turns, wire?  /  LZ1VB
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3 AF Upgrade Kit (for speaker amplifier and LINE OUTs)

[Jan Erik Holm]

wayne burdick wrote:


SPEAKER AMP:  The mod kit includes a very low-resistance RF choke for 
use at RFC47

73,
Wayne
N6KR


What is the value?   / SM2EKM

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3: dBV meter

[Jan Erik Holm]

S Sacco wrote:


For testing, the K3 has the very excellent feature whereby it can
measure the receive voltage.  That would be an FB way to compare
signals.


No it would not.The dBV meter is only useful on a constant and
steady carrier.

/ Jim SM2EKM

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Ken Alexander]

> The digital steps derived to drive the S-meter correlate to
> the marks on the S-meter in whole S units, it does not indicate anything
> in between.  It is good enough for most displays and radio control
> programs since they usually display the S-meter in steps of whole S-units
> anyway.  Those that I have looked at do not indicate fractions of an
> S-unit, so I believe the S-meter resolution is adequate for most
> purposes.

Right on, Don.

Lemme see, when was the last time somebody told me my signal was S6.3 on their 
meternope, never!  S9+21.8?  Never!

8-)

Ken
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3 AF Upgrade Kit (for speaker amplifier and LINE OUTs)

[Igor Sokolov]

I would also like to know that please.
73, Igor UA9CDC


Wayne
Can you tell us the serial number at which
these changes were incorporated?
We need to know who needs to order them
and who does not.
Thanks and 73
Bob N6WG

- Original Message - 
From: "wayne burdick" <[EMAIL PROTECTED]>

To: "Elecraft Reflector" 
Sent: Thursday, November 13, 2008 10:40 AM
Subject: [Elecraft] K3 AF Upgrade Kit (for speaker amplifier and LINE OUTs)


With minor circuit changes, both the K3's speaker amplifier and line 
outputs can provide lower IMD (intermodulation distortion) at higher 
signal levels. We've been testing these changes for a couple of months, 
and have already phased them into production.


These changes can easily be made to existing K3s. A kit of parts is 
available (K3AFMDKT). All parts are leaded (not surface mount), and full 
instructions are provided. See:


   http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Details
---

SPEAKER AMP:  The mod kit includes a very low-resistance RF choke for use 
at RFC47 on the RF board. This improves speaker amplifier IMD by as much 
as 25 dB at moderate to high AF GAIN settings by reducing the voltage drop 
across RFC47 during signal peaks.


LINE OUT:  The kit also includes smaller resistor values for R19 and R20 
on the KIO3 module. At present R19 and R20 are about 600 ohms, while the 
replacements drop the resistance to around 50 ohms. The smaller resistors 
increase the available voltage swing at the output of the LINE OUT 
transformers, which improves IMD at higher signal levels.


These two changes are independent. For example, if you never use LINE 
OUTs, you might want to do only the speaker amp modification.


73,
Wayne
N6KR

---

http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraftHelp: 
http://mailman.qth.net/subscribers.htm

Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com 


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: dB Gain -- was RE: [K3] [Elecraft] FLx GN Adding Db gain

[Jim Brown]

On Thu, 13 Nov 2008 23:42:37 +, David Woolley (E.L) wrote:

>Audio dB are weighted by frequency, so the same power at different 
>frequencies will not produce a 0dB difference.

The use of weighting requires another suffix. 

>It's more complex than that.  Classical music broadcasters need to
>respect dynamic range

Of course -- I oversimplified (only slightly) as an exageration of 
conditions in the US. Here we have VERY few classical broadcasters. 
AND -- while dynamic range must be respected, it cannot be 
maintained as a copy of an actual performance because the noise 
level of the listening environment is simply too high. A symphonic 
performance on CD can have a dynamic range of 90 dB, but the noise 
level in most homes is on the order of 50 dBA. 90 dB + 50 dBA = 140 
dBA, which is 20 dB more than almost any home stereo rig. And your 
car is more like 70 dBA. 

73,

Jim K9YC


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] My Evaluation Of The K3 Carry Bag By Rose Kopp

[BOB PHILBROOK]

I always allow plenty of time before I make an evaluation of a product.  Most 
products look good and appear to be able to do the job.  It is only in the real 
word of use can one really find out if a product is quality or not.

I have had my K3 carry case by Rose Kopp for 7 months and have used the heck 
out of it.  I have used it to carry my K3 through airport security, on 
airplanes as carry on luggage, to and from vacation sites, and to and from 
field day.  I can honestly say this is one rugged, well built carry case using 
quality components that does a beautiful job of protecting and transporting my 
K3.

I ordered one optional add on side pocket in which I put my hand mike and PSK 
and power cables.  The big standard pocket is large enough to carry the K3 
operations manual along with other paper documents I might want.  

So for users looking for a nice padded carry case for your K3, you should drop 
Rose a note and look at their products.  Quality and service are top notch -- 
something you expect from a K3 related product.

Bob, K9PAG

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] K3 AF Stage Upgrade (WAS: in-band-IMD test)

[Ron D'Eau Claire]

Thanks, Joe. I looked in the wrong place. Eric dropped me a note saying he
is putting the instructions on the web site. 

Ron AC7AC

-Original Message-
From: Joe Subich, W4TV [mailto:[EMAIL PROTECTED] 
Sent: Thursday, November 13, 2008 9:33 AM
To: 'Ron D'Eau Claire'; [EMAIL PROTECTED]; elecraft@mailman.qth.net;
[EMAIL PROTECTED]
Subject: RE: [Elecraft] K3 AF Stage Upgrade (WAS: in-band-IMD test)




> You'll need to contact [EMAIL PROTECTED] for info. For some
> reason the kit and the instructions are not on the Elecraft WEB site. 

The kit is listed here: 

http://www.elecraft.com/order_form_parts.htm#K3%20Parts

However, the instructions are not on the web site. 

73, 

   ... Joe, W4TV 
 

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] K3 panadapter choices

[K7TV]

Researching my options for a K3 panadapter (Softrock, LP-PAN, SDR-IQ,
Perseus, Mercury...) I want to thank Paul W9AC for sharing his experience
with the SDR-IQ on the list:

"When observing signal strength on the display, there's ample resolution for 
signal comparisons.  SDR-IQ is powered from the PC's USB port, so only two 
connections are made (I.F. and USB).  SpectraVue supports the K3 and using 
the "point 'n click" feature has been great.  Click on the display and the 
K3 instantly moves to that frequency.  The only shortcoming I've found is 
that SpectraVue needs to poll the K3's mode offset data so that changing 
modes does not require an offset change in SpectraVue.  Not sure if that's 
handled automatically when using LP-PAN and PowerSDR."

I would be very interested to read similar detail about the other possible
hardware and software choices. An overview table showing which spectrum
analysis software packages work with which hardware choices would be very
helpful. 

As long as a the hardware is used for spectrum display (not as a receiver to
be listened to) it seems to me that hardware in the low to middle price
range is good enough. The issue then is the software choice first and then
finding hardware compatible with the software. When choosing software I
would really like to know if there is any package available today that
already adjusts for the mode offset, or is planned to do so in the near
future. A wide and narrow spectrum display window may also be a positive
feature in comparing one software package to another, especially if one is
going to run other software at the same time. 

If one contemplates actually listening to the outboard SDR, it seems that
more money does buy better performance, although probably none of the
reasonable hardware choices will be as good in some contests as the second
receiver option of the K3, which has roofing filters. On the other hand, it
would hardly be practical for an assistant operator to reach the K3 controls
to make use of the second receiver, while the computer controlling an
outboard SDR could easily be used by an assistant operator. (Of course
depending on the contest, this may or may not be legal for a given entry
class.) Maybe the second RX in a K3 could be run from a computer while the
rig is otherwise run from the front panel? Maybe two computers (one per
operator) could be used to control the K3 with second RX. I don't have
experience with the various rig control software available, so I hope
someone can enlighten me.

73,
Erik K7TV

-- 
View this message in context: 
http://n2.nabble.com/K3-panadapter-choices-tp1495993p1495993.html
Sent from the Elecraft mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] Re: Band condx Questions from a Liberal Arts Major

[John Magliacane]

--- On Thu, 11/13/08, Jim Brown <[EMAIL PROTECTED]> wrote:

> Yes, but not necessarily what you think. Most of the "in and out"
> fading we hear on HF is the result of multipath. That is, the signal
> travels over two paths that differ a bit in time, which puts them
> out of phase. When they out of phase by some odd multiple
> of 180 degrees, they cancel, and by an even multiple of 180
> degrees, they add.

Absolutely correct!

Being a on-air frequency measurement "nut" (originally started with my K2),
I recently started looking into the issue of fading, and the effects it has
on making accurate frequency measurements.

Here's a short video clip illustrating WWV's carrier phase plotted against a 
local
frequency standard as a Lissajous pattern as received over a 1622 mile path.

Everything you described can be seen through careful observation of this clip:

http://www.youtube.com/watch?v=nf9KWfS9QBs
 
> The DEPTH of fading (that is, the weak part of the fade) depends
> on perfect cancellation of the signal, which happens when the
> two arrivals are almost precisely equal in strength.

Sometimes the second path "wins out" after the fade, and the resultant signal
emerges 180 degrees out of phase with what it was before the fade.

Aside from multipath, much of the slow and shallow fading seen on low HF 
frequencies
during the day can be the result of variations in D-layer absorption.


73, de John, KD2BD

--
Visit John on the Web at:

http://kd2bd.ham.org/
.


  
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] [K3] K3AFMDKT

[O. Johns]

The K3AFMDKT mod kit for the K3 AF stage is listed in the Spare Parts  
and Mod Kits page, for $10.  But it is not yet listed on the  
Enhancements and Application Notes Page.  So there is no manual or  
descriptive pdf file that would let us judge whether a late K3 does or  
does not already have the mod installed.  Coming?


Oliver
W6ODJ
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] W1 Watt Meter

[Bill Johnson]

I made the mod, and it is a nice touch except for one minor problem for me,
the LED's are not as bright as the originals.


73,

Bill
K9YEQ
K2 #35; KX1 #35; K3 #1744; mini mods

-Original Message-
Hi Tom ...

One change I made to my W1 that helps a lot from a usability point-of-view
is to replace some of the red LEDs in the SWR indicator with different
colors.  This is because the W1 is small and has even smaller lettering on
the SWR scale.  In my installation, and probably most others, it will be
located 2 to 5 feet away from the operator and the SWR value will be
difficult to read without getting right up close to the W1.

Here's what I did:  I used green LEDs in the 1.1, 1.2 and 1.3 positions.
Yellow LEDs in the 1.5 and 1.7 positions.  An amber LED in the 2.0 position
and left the red LEDs in the higher SWR positions.  This way you can tell at
a glance (and at a distance) the relative goodness of your SWR situation.

Suitable replacement LEDs are readily and inexpensively available from
Mouser, etc.  Here are the Mouser PNs:
Green 696-SSL-LX2573PGD
Yellow 696-SSL-LX2573YD
Amber 696-SSL-LX2573AD

  73
   ... Craig  AC0DS


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] K3: S meter

[Joe Subich, W4TV]

> The only shortcoming I've found is that SpectraVue needs to 
> poll the K3's mode offset data so that changing modes does 
> not require an offset change in SpectraVue.  Not sure if 
> that's handled automatically when using LP-PAN and PowerSDR.

Yes, LP-Pan/PowerSDR handle the mode offset automatically. 
You could probably use Larry's LP-Bridge to allow Spectraview 
to work with other software. 

73, 

   ... Joe, W4TV 





> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of Paul 
> Christensen
> Sent: Thursday, November 13, 2008 4:40 PM
> To: Jan Erik Holm
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] K3: S meter
> 
> 
> > "If everybody is using K3´s and the difference is smaller
> then 5 dB you can´t see it on the S-meter and since the
> AGC is so darn good you can´t hear it either."
> 
> Reading the Rx voltage scale is one option, but IMHO, a 
> better solution for 
> signal comparison purposes is to use the K3 with either 
> LP-PAN or SDR-IQ.
> 
> Based on feedback from other users here, I have been testing 
> the K3 with 
> SDR-IQ and SpectraVue software, and the results have been 
> most impressive. 
> I performed the N8LP I.F. buffer mod on the K3 and have its 
> I.F. ported to 
> the SDR-IQ.  Up to 192 kHz of display resolution is possible 
> and no external 
> sound card is required.  So far, anything I can hear on the 
> K3 will display 
> on the screen.  CPU utilization is low and both the software 
> and interface 
> have been rock-solid.  Performance is independent of the PC 
> and its sound 
> card.  This makes it convenient to use the K3 with my desktop 
> PC or laptop 
> when I want to go portable.
> 
> When observing signal strength on the display, there's ample 
> resolution for 
> signal comparisons.  SDR-IQ is powered from the PC's USB 
> port, so only two 
> connections are made (I.F. and USB).  SpectraVue supports the 
> K3 and using 
> the "point 'n click" feature has been great.  Click on the 
> display and the 
> K3 instantly moves to that frequency.  The only shortcoming 
> I've found is 
> that SpectraVue needs to poll the K3's mode offset data so 
> that changing 
> modes does not require an offset change in SpectraVue.  Not 
> sure if that's 
> handled automatically when using LP-PAN and PowerSDR.
> 
> Paul  W9AC
> 
> ___
> Elecraft mailing list
> Post to: Elecraft@mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: dB Gain -- was RE: [K3] [Elecraft] FLx GN Adding Db gain

[David Woolley (E.L)]

Jim Brown wrote:
Lots of questions. See some answers interspersed. 


On Tue, 11 Nov 2008 18:22:50 -0800, Dick Dievendorff wrote:


I think I usually get that right (along with kHz), but I get confused when I
see dBi, dBm, seemingly dBx for all X.  I presume it's a measure of loudness
relative to X, so a dBi is gain relative to an isotropic radiator, and dBw
is what with watts?  


All dB is relative -- that is, A is x dB louder or quieter than B. 


Unfortunately, on the K3, Elecraft apparently confuse the issue by using 
a "v" suffix to indicate that the dB, although not relative to a defined 
standard, are computed using the 20 Log 10 (V1/V2) method, rather rather 
than the 10 Log 10 (P1/P2) method. (Whilst these are identical if the 
load impedance is constant, they produce different results if the 
impedance isn't constant.)



And is a dB of voltage equivalent to a dB of power or an audio dB of
loudness?   


Audio dB are weighted by frequency, so the same power at different 
frequencies will not produce a 0dB difference.




Broadcasters have long been in an eternal search for loudness. If the meter 
moves below the red there isn't enough processing, and someone is going to 
get fired. :) 


It's more complex than that.  Classical music broadcasters need to 
respect dynamic range, whereas pop music broadcasters tend to want 
maximum loudness.  FM broadcasts tend to be companded less than AM ones. 
 In the UK, at least, TV adverts are transmitted at a higher loudness 
than most programme material.




--
David Woolley
"The Elecraft list is a forum for the discussion of topics related to 
Elecraft products and more general topics related ham radio"

List Guidelines 
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] Tigthning Up K3 Loose Screws

[BOB PHILBROOK]

Even though I properly tightened all case screws at assembly time, I noticed 
that after using my kit K3 for a few months, many of the case screws were 
loose.  Probably the thermal expansion and contraction as well as the settling 
of the various case pieces into something comfortable for the K3 pieces.

By loose I don't mean they were falling out but many needed  half or more of a 
turn to bring them back to proper tightness.

So taking the time to tighten all the case screws might be something all K3 
owners should consider if and when they get the chance.

Bob, K9PAG___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Paul Christensen]

"I believe that if the PowerPole on the K3 was installed on a short length 
of

flexible wire we would not be reading about this problem as it would not
exist."

That would make a connector change-out very easy should the PowerPole 
contacts become damaged..


A while back, I had shifted the K3 cabinet while listening to a QSO and the 
PowerPole disconnected from the lateral movement.  It's mostly the lateral 
tension that creates the propensity for accidental disconnects.  If I had 
moved the cabinet while transmitting at 100W, I suspect that I would need to 
have gone in and replaced the fused/welded pins.  Arguably, K3 owners 
shouldn't be moving the rig while operating!


I have a love-hate relationship with the PowerPole: I love the convenience 
(e.g., Rigrunner DC manifold); but I hate that the connector does not "lock 
'n mate" as compared to those power connectors manufactured by MOLEX and 
AMP.  Locking the PowerPole requires some external means like a tie-wrap, or 
the special plastic bridge clip being sold by Anderson.


Ensuring a correct crimp is part of the solution, but not the whole 
solution.  I have a shop drawer full of professional ratcheting crimpers and 
prior to the recent purchase of the West Mountain crimper, I thought I was 
doing a good job.  But what was occurring with my existing crimper is that 
the contact tip was bending slightly out of alignment during the crimp 
process.  The West Mountain crimper locks the contact tip while crimping, 
thereby ensuring the pin remains straight with the barrel after crimping. 
Moreover, the West Mountain crimper ensures a completely concentric crimp. 
Had I not tried it myself, I would not have believe there could be that much 
of a difference between it and my other ratcheting crimpers.


Paul, W9AC







___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3: S meter

[Paul Christensen]

"If everybody is using K3´s and the difference is smaller

then 5 dB you can´t see it on the S-meter and since the
AGC is so darn good you can´t hear it either."

Reading the Rx voltage scale is one option, but IMHO, a better solution for 
signal comparison purposes is to use the K3 with either LP-PAN or SDR-IQ.


Based on feedback from other users here, I have been testing the K3 with 
SDR-IQ and SpectraVue software, and the results have been most impressive. 
I performed the N8LP I.F. buffer mod on the K3 and have its I.F. ported to 
the SDR-IQ.  Up to 192 kHz of display resolution is possible and no external 
sound card is required.  So far, anything I can hear on the K3 will display 
on the screen.  CPU utilization is low and both the software and interface 
have been rock-solid.  Performance is independent of the PC and its sound 
card.  This makes it convenient to use the K3 with my desktop PC or laptop 
when I want to go portable.


When observing signal strength on the display, there's ample resolution for 
signal comparisons.  SDR-IQ is powered from the PC's USB port, so only two 
connections are made (I.F. and USB).  SpectraVue supports the K3 and using 
the "point 'n click" feature has been great.  Click on the display and the 
K3 instantly moves to that frequency.  The only shortcoming I've found is 
that SpectraVue needs to poll the K3's mode offset data so that changing 
modes does not require an offset change in SpectraVue.  Not sure if that's 
handled automatically when using LP-PAN and PowerSDR.


Paul  W9AC

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Re: Band condx Questions from a Liberal Arts Major

[Jim Brown]

On Thu, 13 Nov 2008 14:50:34 -0500, Jack Smith wrote:

>not two-ray 
>fading. Two-ray fading gives you a Rician distribution when looking at 
>the probability density function, and N-ray fading 

While there may be many (N) arrivals, near-perfect cancellation occurs 
when two arrivals dominate, are equal, and are either some odd multiple of 
180 degrees out of phase or in phase and out of polarity. 

73,

Jim Brown K9YC



___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3: S meter

[S Sacco]

Notwithstanding Eric's request to let this rest...

For testing, the K3 has the very excellent feature whereby it can
measure the receive voltage.  That would be an FB way to compare
signals.
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3: S meter

[Eric Swartz - WA6HHQ, Elecraft]

Lets let this topic rest for now. :-)

73, Eric  WA6HHQ
Elecraft list moderator


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Eric Swartz - WA6HHQ, Elecraft]

Hi Rich,

I've forwarded your comments to our test techs to make sure they look 
for this on each RF board as they test and align it.


73, Eric  WA6HHQ


Rich wrote:

The factory installed PowerPole connector was misaligned on my K3.  After
trying to make sure the connectors I made were correct, several times, I
discovered that the “flat” (with a small dimple) connectors were to far back
on the heavy piece of wire they are soldered to.  This prevents them from
extending all the way out to the proper position as required by the mating
PowerPole connector. Thus when connected the little humps had nor slide over
each other and were not fully engaged.  I heated up each of these two
factory installed connectors and slid them outward slightly – making sure
that they are PERFECTLY even with each other. This took several attempts. 
Once I had gotten perfect alignment with the PowerPole connector installed

in the K3 I achieved a good connection. It now takes about 3-5 pounds of
force to pull them apart.  Since the connector in the K3 is mounted on heavy
wire if they are not soldered in the correct position they will not fit in
the connector correctly.   AND since this wire has a 90 degree bend at the
back, it can keep the connector case from going all the way back and
preventing proper engagement of the mating connector.  The connector on the
flexible wire is not a problem as there is give between the two wires and
that can allow the connectors to be properly seated in the case for proper
alignment and connection with the mating connector. 


I believe that if the PowerPole on the K3 was installed on a short length of
flexible wire we would not be reading about this problem as it would not
exist.  Either Elecraft should test EVERY connector or mount the connector
on a short length or wire.

Rich,
KE0X


  

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Rich]

The factory installed PowerPole connector was misaligned on my K3.  After
trying to make sure the connectors I made were correct, several times, I
discovered that the “flat” (with a small dimple) connectors were to far back
on the heavy piece of wire they are soldered to.  This prevents them from
extending all the way out to the proper position as required by the mating
PowerPole connector. Thus when connected the little humps had nor slide over
each other and were not fully engaged.  I heated up each of these two
factory installed connectors and slid them outward slightly – making sure
that they are PERFECTLY even with each other. This took several attempts. 
Once I had gotten perfect alignment with the PowerPole connector installed
in the K3 I achieved a good connection. It now takes about 3-5 pounds of
force to pull them apart.  Since the connector in the K3 is mounted on heavy
wire if they are not soldered in the correct position they will not fit in
the connector correctly.   AND since this wire has a 90 degree bend at the
back, it can keep the connector case from going all the way back and
preventing proper engagement of the mating connector.  The connector on the
flexible wire is not a problem as there is give between the two wires and
that can allow the connectors to be properly seated in the case for proper
alignment and connection with the mating connector. 

I believe that if the PowerPole on the K3 was installed on a short length of
flexible wire we would not be reading about this problem as it would not
exist.  Either Elecraft should test EVERY connector or mount the connector
on a short length or wire.

Rich,
KE0X




Don Brown-4 wrote:
> 
> Hi
> 
> PowerPoles can be locked together with a small 'U" shaped piece of stiff 
> wire run through the holes between the red and black blocks after plugging 
> in the connectors. I do this on my solar panel setup to keep the
> connectors 
> in place even if the wires get pulled.
> 
> 
> Thanks
> 
> Don Brown
> KD5NDB
> 
> 
> 

-- 
View this message in context: 
http://n2.nabble.com/Questions-from-a-Liberal-Arts-Major-tp1494099p1495455.html
Sent from the Elecraft mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3: S meter

[Jan Erik Holm]

Don´t you ever like to compare two antennas? Or someone you
have a QSO with likes to compare antennas or something else,
amplifiers or what ever.
If everybody is using K3´s and the difference is smaller
then 5 dB you can´t see it on the S-meter and since the
AGC is so darn good you can´t hear it either.
Oooh, I forgot, then we have to buy test equipment!!!

73 Jim SM2EKM

DOUGLAS ZWIEBEL wrote:

I am so blessed to be a contester.  Everybody is S9.  Of course, if
the guy is really, really weak and I need several repeats, then he
only gets a 599.

:-)

de Doug KR2Q


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] K3: S meter

[DOUGLAS ZWIEBEL]

I am so blessed to be a contester.  Everybody is S9.  Of course, if
the guy is really, really weak and I need several repeats, then he
only gets a 599.

:-)

de Doug KR2Q
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Jan Erik Holm]

Thanks David, yes I believe so, I do get the "click".
It´s no big issue, I can live with it however IMO
as stated before this is a bad type of connector.

73 Jim SM2EKM

David Pratt wrote:

In a recent message, Jan Erik Holm <[EMAIL PROTECTED]> wrote ...

12V power connector, does not have a positive lock, i e can
come loose if radio is moved. Again IMO this is junk.


Have you assembled the connector correctly, Jim?  Both my K3 and my 
XV144 Anderson power connectors go in with a definite 'click' and 
neither of them have come apart unintentionally even when the equipment 
is moved.


Being digital, the S-meter has incremental steps of one S-point which is 
accurate enough for most practical purposes.  In any case, everyone is 
599 or 59 in contests ;-)


73



___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Re: Band condx Questions from a Liberal Arts Major

[Jack Smith]

Ionospheric reflection seems to be generally N-ray fading, not two-ray 
fading. Two-ray fading gives you a Rician distribution when looking at 
the probability density function, and N-ray fading is Rayleigh 
statistics with a Rayleigh PDF.


I've looked at this  recently but not nearly in the detail I would like 
to, but what I have seen is closer to Rayleigh than Rician fading. The 
standard references, including both of Kenneth Davies' books on 
ionospheric propagation say Rayleigh fading as well.


Rician fading is more common in microwave where a direct and reflected 
path will exist due to abnormal atmospheric conditions or mid-path  
reflections. (Paths are normally designed not to have a reflected path, 
but sometimes they occur.)


I've put some data up at 
http://www.cliftonlaboratories.com/signal_statistics.htm but as I say, 
it needs quite a bit more work and analysis to verify Rayleigh versus 
Rician fading. Over  the years, I've collected a lot of signal data at 
VHF and UHF, going back to when we drove a chart recorded from the 
speedometer cable and there's no doubt whatsoever that in the urban 
environment, fading follows Rayleigh statistics once you are more than a 
kilometer or so from the transmitter.


Jack K8ZOA


Jim Brown wrote:
The fading on SSB and CW modes can tell you a lot about what the 
band is doing. 



Yes, but not necessarily what you think. Most of the "in and out" 
fading we hear on HF is the result of multipath. That is, the signal 
travels over two paths that differ a bit in time, which puts them 
out of phase. When they out of phase by some odd multiple of 180 
degrees, they cancel, and by an even multiple of 180 degrees, they 
add. 

The time interval of the fading depends on the time difference of 
the arrivals and the wavelength of the signal. We're used to hearing 
this kind of thing on mobile signals, and also when an aircraft 
reflects a VHF or UHF signal. Those VHF/UHF wavelengths are short, 
so the fading has a fast characteristic (an interval often less than 
a second). Down on 160M, it's common for the fading interval to be 
tens of seconds or a minute. 

The DEPTH of fading (that is, the weak part of the fade) depends on 
perfect cancellation of the signal, which happens when the two 
arrivals are almost precisely equal in strength. 


73,

Jim Brown K9YC


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

  

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] Re: Band condx Questions from a Liberal Arts Major

[Don Rasmussen]

>>>If you can't hear the difference, perhaps the AGC is adjusted too 'tightly'.

Yes, as Wayne will confirm, I keep a minimal AGC, the loosest that
anyone might imagine. 

Assume Wayne checks into the SSB net and your ears say - very strong - so
you look at the S-meter. S7 peaks to S8.

Ten minutes later Eric checks in, you say, very loud too, and take a look at 
the S-meter. S9 to S9+5.

You now have a visual relative benchmark on Wayne and Eric and can fairly
easily follow the changes on each.

By ear, well, that would be impossible for me. 

How do you make a note in the log on Wayne that would have any
meaning later with respect to Eric? Just one example, I am pretty sure
many others do it similarly.

Some may or may not care as long as they can hear them at all, that's the 
preference part. 

[Elecraft] Re: Band condx Questions from a Liberal Arts Major 
Ralph Parker ve7xf at dccnet.com 
Thu Nov 13 13:49:08 EST 2008 

>The fading on SSB and CW modes can tell you a lot about what the band is
doing. 

Indeed, but I've always done this by ear, rather than by watching the S-meter.

If you can't hear the difference, perhaps the AGC is adjusted too 'tightly'.

Rapid CW QSB can easily be seen on an audio recording monitored in audio
editing software (at least it can on my previous radio).

VE7XF





___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Re: Band condx Questions from a Liberal Arts Major

[Jim Brown]

>The fading on SSB and CW modes can tell you a lot about what the 
>band is doing. 

Yes, but not necessarily what you think. Most of the "in and out" 
fading we hear on HF is the result of multipath. That is, the signal 
travels over two paths that differ a bit in time, which puts them 
out of phase. When they out of phase by some odd multiple of 180 
degrees, they cancel, and by an even multiple of 180 degrees, they 
add. 

The time interval of the fading depends on the time difference of 
the arrivals and the wavelength of the signal. We're used to hearing 
this kind of thing on mobile signals, and also when an aircraft 
reflects a VHF or UHF signal. Those VHF/UHF wavelengths are short, 
so the fading has a fast characteristic (an interval often less than 
a second). Down on 160M, it's common for the fading interval to be 
tens of seconds or a minute. 

The DEPTH of fading (that is, the weak part of the fade) depends on 
perfect cancellation of the signal, which happens when the two 
arrivals are almost precisely equal in strength. 

73,

Jim Brown K9YC


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] [K3] in-band-IMD test

[Joe Subich, W4TV]

> Hmmm -  improvements to the front panel power supply?

According to the documentation, the RF choke is being replaced by 
another with significantly less resistance.  This results in less 
voltage drop on signal (audio peaks) and will obviously result in 
less IMD (due to current starvation in the audio circuits).
  


> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of Bob Cunnings
> Sent: Thursday, November 13, 2008 1:07 PM
> To: Elecraft@mailman.qth.net
> Subject: Re: [Elecraft] [K3] in-band-IMD test
> 
> 
> Hmmm -  improvements to the front panel power supply?
> 
> Bob NW8L
> 
> On Thu, Nov 13, 2008 at 8:39 AM, Joe Subich, W4TV 
> <[EMAIL PROTECTED]> wrote:
> >
> > Have these tests been made AFTER the AF board modification? 
> > Improvements to the power supply to the front panel can have a 
> > significant effect on this issue.
> >
> >
> >> -Original Message-
> >> From: [EMAIL PROTECTED] 
> >> [mailto:[EMAIL PROTECTED] On Behalf Of JOHN
> >> Sent: Thursday, November 13, 2008 10:01 AM
> >> To: Elecraft@mailman.qth.net
> >> Subject: Re: [Elecraft] [K3] in-band-IMD test
> >>
> >>
> >> Hello,
> >>
> >> Good job Alex!!! I was pointing out weak in the Channel IMD 
> >> characteristics of K3 for long time!!!
> >>
> >> 73!
> >> John,SP2GGZ,N2KFC,YB1AQV,
> >>
> >
> > ___
> > Elecraft mailing list
> > Post to: Elecraft@mailman.qth.net
> > You must be a subscriber to post to the list.
> > Subscriber Info (Addr. Change, sub, unsub etc.):  
> > http://mailman.qth.net/mailman/listinfo/elecraft
> >
> > Help: http://mailman.qth.net/subscribers.htm
> > Elecraft web page: http://www.elecraft.com
> >
> ___
> Elecraft mailing list
> Post to: Elecraft@mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] Re: Band condx Questions from a Liberal Arts Major

[Ralph Parker]

>The fading on SSB and CW modes can tell you a lot about what the band is
doing. 

Indeed, but I've always done this by ear, rather than by watching the S-meter.
If you can't hear the difference, perhaps the AGC is adjusted too 'tightly'.

Rapid CW QSB can easily be seen on an audio recording monitored in audio
editing software (at least it can on my previous radio).

VE7XF

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3 AF Upgrade Kit (for speaker amplifier and LINE OUTs)

[Bob Tellefsen]

Wayne
Can you tell us the serial number at which
these changes were incorporated?
We need to know who needs to order them
and who does not.
Thanks and 73
Bob N6WG

- Original Message - 
From: "wayne burdick" <[EMAIL PROTECTED]>

To: "Elecraft Reflector" 
Sent: Thursday, November 13, 2008 10:40 AM
Subject: [Elecraft] K3 AF Upgrade Kit (for speaker amplifier and LINE OUTs)


With minor circuit changes, both the K3's speaker amplifier and line 
outputs can provide lower IMD (intermodulation distortion) at higher 
signal levels. We've been testing these changes for a couple of months, 
and have already phased them into production.


These changes can easily be made to existing K3s. A kit of parts is 
available (K3AFMDKT). All parts are leaded (not surface mount), and 
full instructions are provided. See:


   http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Details
---

SPEAKER AMP:  The mod kit includes a very low-resistance RF choke for 
use at RFC47 on the RF board. This improves speaker amplifier IMD by as 
much as 25 dB at moderate to high AF GAIN settings by reducing the 
voltage drop across RFC47 during signal peaks.


LINE OUT:  The kit also includes smaller resistor values for R19 and 
R20 on the KIO3 module. At present R19 and R20 are about 600 ohms, 
while the replacements drop the resistance to around 50 ohms. The 
smaller resistors increase the available voltage swing at the output of 
the LINE OUT transformers, which improves IMD at higher signal levels.


These two changes are independent. For example, if you never use LINE 
OUTs, you might want to do only the speaker amp modification.


73,
Wayne
N6KR

---

http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] K3 AF Upgrade Kit (for speaker amplifier and LINE OUTs)

[wayne burdick]

With minor circuit changes, both the K3's speaker amplifier and line 
outputs can provide lower IMD (intermodulation distortion) at higher 
signal levels. We've been testing these changes for a couple of months, 
and have already phased them into production.


These changes can easily be made to existing K3s. A kit of parts is 
available (K3AFMDKT). All parts are leaded (not surface mount), and 
full instructions are provided. See:


   http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Details
---

SPEAKER AMP:  The mod kit includes a very low-resistance RF choke for 
use at RFC47 on the RF board. This improves speaker amplifier IMD by as 
much as 25 dB at moderate to high AF GAIN settings by reducing the 
voltage drop across RFC47 during signal peaks.


LINE OUT:  The kit also includes smaller resistor values for R19 and 
R20 on the KIO3 module. At present R19 and R20 are about 600 ohms, 
while the replacements drop the resistance to around 50 ohms. The 
smaller resistors increase the available voltage swing at the output of 
the LINE OUT transformers, which improves IMD at higher signal levels.


These two changes are independent. For example, if you never use LINE 
OUTs, you might want to do only the speaker amp modification.


73,
Wayne
N6KR

---

http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] Questions from a Liberal Arts Major

[Don Rasmussen]

>> I'm trying to figure out how to "hear" an S_Meter, but I suppose we  
>> all "listen" in different ways.

It's true Grant, the received signal has a rythm of amplitude that can be seen 
on the S-meter, but that effect is greatly reduced by the AGC if you are only 
listening for a change in the level of the AF. The effect is also reduced 
greatly by displaying 5 db chunk bars only as on/off/flicker values. 

The fading on SSB and CW modes can tell you a lot about what the band is doing. 

To me, this is an issue that has merit, as some others have suggested.

You will really enjoy your K3, and having been an Orion pioneer it will
be an interesting comparison. 


[Elecraft] Questions from a Liberal Arts Major
Grant Youngman nq5t at tx.rr.com 
Thu Nov 13 12:27:51 EST 2008 

Previous message: [Elecraft] Questions from a Liberal Arts Major 
Next message: [Elecraft] N2CQ QRP Contest Calendar: Nov 13 - Dec 14, 2008 
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] 




> Five DB steps that can be on or off with a flicker fall way short  
> for me as well, a convincing analog meter is 50% of the listening  
> experience at this QTH.

I'm trying to figure out how to "hear" an S_Meter, but I suppose we  
all "listen" in different ways.

I'm really surprised, after happily monitoring this list in stealth  
mode for some time while waiting for my K3 to arrive, how much it has  
begun to sound from time to time like every other vendor/product list,  
all of which I finally retired from after tiring of these sorts of  
discussions.  Or perhaps I just haven't yet realized how many serious  
problems my new K3 has :)

(returning to stealth mode)

Grant/NQ5T

UR RST 5 8.39974 9






Previous message: [Elecraft] Questions from a Liberal Arts Major 

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] [K3] in-band-IMD test

[Bob Cunnings]

Hmmm -  improvements to the front panel power supply?

Bob NW8L

On Thu, Nov 13, 2008 at 8:39 AM, Joe Subich, W4TV
<[EMAIL PROTECTED]> wrote:
>
> Have these tests been made AFTER the AF board modification?
> Improvements to the power supply to the front panel can have
> a significant effect on this issue.
>
>
>> -Original Message-
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of JOHN
>> Sent: Thursday, November 13, 2008 10:01 AM
>> To: Elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] [K3] in-band-IMD test
>>
>>
>> Hello,
>>
>> Good job Alex!!! I was pointing out weak in the Channel IMD
>> characteristics of K3 for long time!!!
>>
>> 73!
>> John,SP2GGZ,N2KFC,YB1AQV,
>>
>
> ___
> Elecraft mailing list
> Post to: Elecraft@mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] Questions from a Liberal Arts Major

[Joe Subich, W4TV]

> I assume you mean 6dB steps:

In the case of the K3 it is 5 dB steps.  If the S-meter is 
calibrated according to the manual S9 = 50 uV and S2 or S3 
= 1 uV.  For S2 = 1 uV we have 20log(1/50)/7 or 4.85 dB/unit. 
For S3 = 1uV we get 20log(1/50)/6 or 5.66 dB/unit. 

A very repeatable 5 dB per unit is fine for me considering 
that most of the even "high end" other transceivers have 
S-units that vary from 2 to 8 dB depending on where one 
starts.  The K3 is also among the very few that can display 
an absolute S-meter (true signal strength) reading as the 
preamp and attenuator are used in various combinations. 

73, 

   ... Joe, W4TV 
 


> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of 
> [EMAIL PROTECTED]
> Sent: Thursday, November 13, 2008 10:53 AM
> To: elecraft@mailman.qth.net
> Subject: RE: [Elecraft] Questions from a Liberal Arts Major
> 
> 
> > a very accurate scale in S-unit (5 dB) steps.
> 
> I assume you mean 6dB steps:
> 
> Page 156 
> Page 142 
> 
> 
> ___
> Elecraft mailing list
> Post to: Elecraft@mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] K3 AF Stage Upgrade (WAS: in-band-IMD test)

[Joe Subich, W4TV]

> You'll need to contact [EMAIL PROTECTED] for info. For some 
> reason the kit and the instructions are not on the Elecraft WEB site. 

The kit is listed here: 

http://www.elecraft.com/order_form_parts.htm#K3%20Parts

However, the instructions are not on the web site. 

73, 

   ... Joe, W4TV 
 


> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of Ron 
> D'Eau Claire
> Sent: Thursday, November 13, 2008 12:20 PM
> To: [EMAIL PROTECTED]; elecraft@mailman.qth.net; 
> [EMAIL PROTECTED]
> Subject: [Elecraft] K3 AF Stage Upgrade (WAS: in-band-IMD test)
> 
> 
> Yes, this is an 'official' mod. Elecraft has instructions and 
> a kit of parts for those who want them.
> 
> You'll need to contact [EMAIL PROTECTED] for info. For some 
> reason the kit and the instructions are not on the Elecraft WEB site. 
> 
> Ron AC7AC
> 
> -Original Message-
> 
> 
> 
> Hallo,
> 
> > The Audio mod is a very simply! You just need to add simple two
> > resistor pararell on KIO3 module and replace one RFI choke! 
> If anyone 
> > need mode just send me mail and I will forward pdf direct !
> 
> Has this modification been blessed by Elecraft or is it an 
> unofficial mod?
> 
> Is the PDF an official doc by Elecraft?
> 
> vy 73 de toby
> 
> ___
> Elecraft mailing list
> Post to: Elecraft@mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
> 
> ___
> Elecraft mailing list
> Post to: Elecraft@mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Grant Youngman]

Five DB steps that can be on or off with a flicker fall way short  
for me as well, a convincing analog meter is 50% of the listening  
experience at this QTH.


I'm trying to figure out how to "hear" an S_Meter, but I suppose we  
all "listen" in different ways.


I'm really surprised, after happily monitoring this list in stealth  
mode for some time while waiting for my K3 to arrive, how much it has  
begun to sound from time to time like every other vendor/product list,  
all of which I finally retired from after tiring of these sorts of  
discussions.  Or perhaps I just haven't yet realized how many serious  
problems my new K3 has :)


(returning to stealth mode)

Grant/NQ5T

UR RST 5 8.39974 9

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[K3] RE: [Elecraft] in-band-IMD test

[Dean Straw]

Hello, Alexander:

Yes, please send me that pdf.

For your information, I am sending a pdf of an article I wrote in December
1995 QST magazine describing modifications to the AGC system of the ICOM
IC-765 to reduce in-band IMD. This illustrates how a "Fast" time constant
can create unwanted in-band IMD.

This article was why the ARRL Laboratory started making detailed in-band IMD
tests for receivers after December 1995.

Thanks & 73, Dean, N6BV
Senior Assistant Technical Editor, ARRL (Retired)
  -Original Message-
  From: e72x (via Nabble) [mailto:[EMAIL PROTECTED]
  Sent: Thursday, November 13, 2008 1:28 AM
  To: Dean Straw
  Subject: Re: in-band-IMD test



  The Audio mod is a very simply! You just need to add simple two resistor
pararell on KIO3 module and replace one RFI choke! If anyone need mode just
send me mail and I will forward pdf direct !

  73, E72X,



  Alexander:

  Sorry but I don't read Russian. What were the K3's AGC settings for the
IMD measurements? At a large input signal (S9+50 dB), using a "Fast" AGC
time constant will often result in poor IMD for conventional receivers using
analog type of AGC systems. I don't know the details of the K3's AGC system,
however.

  Have you tried the S9+50 dB input signal with the "Slow" AGC setting?

  73, Dean Straw, N6BV



Alexander Ponomarenko-5 wrote:
GA for all K3 users.
So many guys has talks about perfect audio sound of K3.
So many talks about "analog K3 sound" on e-ham.
But how it possible if K3 have the so bad in-band IMD?
You can read about "in-band-IMD-measurements" in russian here:
http://forum.cqham.ru/viewtopic.php?t=17119&postdays=0&postorder=asc&&st
art=0




--

  This email is a reply to your post @
http://n2.nabble.com/in-band-IMD-test-tp1491448p1493383.html
  You can reply by email or by visting the link above.



 
-- 
View this message in context: 
http://n2.nabble.com/in-band-IMD-test-tp1491448p1494755.html
Sent from the [K3] mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] N2CQ QRP Contest Calendar: Nov 13 - Dec 14, 2008

[Ken Newman]

~
N2CQ QRP CONTEST CALENDAR
November 13 - December 14, 2008
~
40 METER FOXHUNT (CW) *** QRP Contest ***
Each Thursday Begining Nov 13 Thru March 26
9 PM to 10:29 PM Eastern Time USA
Info: http://www.qrpfoxhunt.org/
~
ARRL Sweepstakes (Phone) ... QRP Category
Nov 15, 2100z to Nov 17, 0300z
Rules: http://www.arrl.org/contests/rules/2008/novss.html
~
NA Collegiate ARC Championship (CW) .. QRP Category
Nov 15, 2100z to Nov 17, 0300z
Rules: http://www.collegiatechampionship.org/rules/
~
European PSK Club - PSK63 QSO Party ... 100W. Max
Nov 16, z to 2400z
Rules: http://www.eu.srars.org/
~
RUN FOR THE BACON (CW) *** QRP CONTEST ***
EDT: Oct 16, 9 PM to 11 PM
UTC: Oct 17, 0200z 0400z
Rules: http://www.fpqrp.com/
~
NAQCC Straight Key/Bug Sprint *** QRP CONTEST! ***
EST: Nov 19, 8:30 PM to 10:30 PM
UTC: Nov 20, 0130z to 0330z
Rules: http://www.arm-tek.net/~yoel/contests.html
~
YO International PSK31 Contest (80 Meters) ... 50W max
Nov 21, 1600z to 2200z
Rules: http://www.yo5crq.ro/Rules2008EN.htm
~
LZ DX CONTEST (CW/SSB) ... QRP Category
Nov 22, 1200z to Nov 23, 1200z
Rules: http://lzdx.bfra.org/index.php/rules
~
SKCC Sprint (Straight Key CW)  ... QRP Awards
Nov 26, 0100z to 0300z
Rules: http://www.skccgroup.com/sprint/sks/
~
CQ World Wide DX Contest (CW) ... QRP Category!
Nov 29, z to Nov 30, 2359z
Rules: http://www.cqww.com/2008_rules_cqww.pdf
~
MQFD Monthly Sprint (CW/PH/Digital) *** QRP Contest ***
Nov 29, 1800z to 2200z
Rules: http://w2agn.net/mqfdsprint.html
~
80 METER FOXHUNT (CW) *** QRP Contest ***
Each Tuesday Thru Mar 24
9 PM to 10:29 PM Eastern Time USA
Info: http://www.qrpfoxhunt.org
~
40 METER FOXHUNT (CW) *** QRP Contest ***
Each Thursday Thru Mar 26
9 PM to 10:29 PM Eastern Time USA
Info: http://www.qrpfoxhunt.org/
~
Adventure Radio Spartan Sprint (CW) *** QRP Contest ***
Dec 2, 0200z to 0400z  (First Monday 9 PM EST)
Rules: http://arsqrp.pbwiki.com/Spartan+Sprints
~
QRP ARCI Topband CW & SSB Sprint *** QRP CONTEST ***
Dec 4, z to 0600z
Rules: http://www.qrparci.org/
~
ARRL 160 meter Contest (CW) ... QRP Category
Dec 5, 2200z to Dec 7, 1600z
Rules: http://www.arrl.org/contests/rules/2008/160-meters.html
~
TARA RTTY Mêlée ... 150W category
Dec 6, z to 2400z
Rules: http://www.n2ty.org/seasons/tara_melee_rules.html
~
Wake-Up! QRP Sprint (CW) *** QRP Contest ***
Dec 6, 0600z to 0800z
Rules:
http://qrp.ru/modules/sections/index.php?op=viewarticle&artid=7&page=1
~
TOPS Activity 80 Meter Contest (CW) ... QRP Category
Dec 6, 1800z to Dec 7, 1800z
Rules: http://procwclub.yo6ex.ro/tacrules.pdf
~
NAQCC Straight Key/Bug Sprint (CW) *** QRP Contest ***
EST: Dec 9, 8:30 PM to 10:30 PM
UTC: Dec 10, 0130Z to 0330Z
Rules: http://www.arm-tek.net/~yoel/contests.html
~
ARRL 10 Meter Contest (CW/SSB) ... QRP Category
Dec 13, z to Dec 14, 2400z
Rules: http://www.arrl.org/contests/rules/2008/10-meters.html
~
MDXA PSK-31/63 DeathMatch  ... QRP Category
Dec 13, z to Dec 14, 2400z
Rules: http://www.mdxa1.org/deathmatch.html
~
Croatian CW Contest (CW) ... QRP Category
Dec 13, 1400z to Dec 14, 1400z
Rules: http://www.hamradio.hr/index.php?
~
UBA Low Band Winter Contest (CW/SSB/RTTY/PSK) .. QRP Category
Dec 13, 1700z to 2100z and
Dec 14, 0600z to 1000z
Rules: http://www.uba.be/hf_contests/pdf/uba_winter_en.pdf
~
SKCC Weekend Sprintathon (Straight Key CW) ... QRP Category
Dec 14, z to 2359z
Rules: http://www.skccgroup.com/sprint/wes/
~~

[Elecraft] K3 AF Stage Upgrade (WAS: in-band-IMD test)

[Ron D'Eau Claire]

Yes, this is an 'official' mod. Elecraft has instructions and a kit of parts
for those who want them.

You'll need to contact [EMAIL PROTECTED] for info. For some reason the kit
and the instructions are not on the Elecraft WEB site. 

Ron AC7AC

-Original Message-



Hallo,

> The Audio mod is a very simply! You just need to add simple two 
> resistor pararell on KIO3 module and replace one RFI choke! If anyone 
> need mode just send me mail and I will forward pdf direct !

Has this modification been blessed by Elecraft or is it an unofficial mod?

Is the PDF an official doc by Elecraft?

vy 73 de toby

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] Questions from a Liberal Arts Major

[Don Rasmussen]

The K3 keeps the S-meter data in 1 decibel increments, and it's on the 
enhancement list to be made available through the K3 RS232 command set. I've 
done some early testing on this and the virtual analog meter on the PC display 
mimics a true analog S-meter convincingly.

Five DB steps that can be on or off with a flicker fall way short for me as 
well, a convincing analog meter is 50% of the listening experience at this QTH. 

[Elecraft] Questions from a Liberal Arts Major
Kurt Pawlikowski kurtt at pinrod.com 
Thu Nov 13 09:54:28 EST 2008 

Previous message: [Elecraft] Questions from a Liberal Arts Major 
Next message: [Elecraft] Questions from a Liberal Arts Major 

Lee,

Don't know about the connector issues (I suppose that might be a 
matter of personal preference). The S-Meter issue has to do with "fine" 
adjustments. Since the meter is a bar graph type, "blocks" are either 
lit or not. If, for instance, you are attempting to "see" the difference 
between 4.3 blocks and 4.4 blocks, they display the same (either 4 or 5 
blocks, depending on software design). Apparently, this design issue is 
also in the data given to a control computer. That is, instead of giving 
a "value" (i.e., 4.321), it is just mimicking the bar graph (i.e., 4 
"blocks"). So, if you're trying to make a comparative measurement 
between similar signals, unless they "happen" to be on the "edge" of two 
"block" values, they will look the same. While this is normal for this 
type of display, it is a little unusual for the computer data stream. 
That usually reflects "raw" data. Does that help? {'-)



___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] Questions from a Liberal Arts Major

[Jim Brown]

Joe has again hit the nail on the head. The K3 is a very high 
quality transceiver. It is not test equipment. You want test 
equipment, you buy test equipment. I'm an EE and I've been a ham 
for 53 years. I find nearly all elements of the K3 user interface 
quite satisfactory, including the S-meter. I am, however, looking 
for additional control of the 2nd RX, and I expect to see that over 
the next few months. 

I am also a huge fan of Anderson Power Pole connectors -- beginning 
in 2004 when I bought my first K2, I've gradually rewired all my 
equipment that runs on low voltage DC to use them. Everything from 
laptops, talkies, Ethernet routers, telephones, etc. and all my 
radio gear. They are reasonably priced (at least in North America), 
easy to wire, and quite reliable. 

73,

Jim K9YC

On Thu, 13 Nov 2008 10:39:00 -0500, Joe Subich, W4TV wrote:

>> Alsowhy is one person calling the S-Meter 

>Because some people do not understand the difference between an 
>amateur transceiver and a $10,000 piece laboratory test equipment. 
>The K3's S-meter circuit is derived form the IF DSP and provides 
>a very accurate scale in S-unit (5 dB) steps.  It does not 
>provide an analog voltage with infinite resolution.  

>> and the power connector "junk" that cannot be fixed?

>The power connector is an Anderson PowerPole and some people 
>(unfairly) object to the use PowerPole connectors. 

>In "liberal arts" terms, there are always those who expect a 
>Ferrari or Maserati for the same price as a Chevrolet Cobalt. 




___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Don Brown]

Hi

PowerPoles can be locked together with a small 'U" shaped piece of stiff 
wire run through the holes between the red and black blocks after plugging 
in the connectors. I do this on my solar panel setup to keep the connectors 
in place even if the wires get pulled.



Thanks

Don Brown
KD5NDB

K3 S/N  0575

--
From: "David Pratt" <[EMAIL PROTECTED]>
Sent: Thursday, November 13, 2008 10:08 AM
To: "Jan Erik Holm" <[EMAIL PROTECTED]>
Cc: "Elecraft Reflector" 
Subject: Re: [Elecraft] Questions from a Liberal Arts Major


In a recent message, Jan Erik Holm <[EMAIL PROTECTED]> wrote ...

12V power connector, does not have a positive lock, i e can
come loose if radio is moved. Again IMO this is junk.


Have you assembled the connector correctly, Jim?  Both my K3 and my XV144 
Anderson power connectors go in with a definite 'click' and neither of 
them have come apart unintentionally even when the equipment is moved.


Being digital, the S-meter has incremental steps of one S-point which is 
accurate enough for most practical purposes.  In any case, everyone is 599 
or 59 in contests ;-)


73

--
David G4DMP
Leeds, England, UK
--


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Don Wilhelm]

Lee,

It seems that some owners are expecting an analog signal from a digital 
source or expect their receiver to be a precision measurement device.  
The digital steps derived to drive the S-meter correlate to the marks on 
the S-meter in whole S units, it does not indicate anything in between.  
It is good enough for most displays and radio control programs since 
they usually display the S-meter in steps of whole S-units anyway.  
Those that I have looked at do not indicate fractions of an S-unit, so I 
believe the S-meter resolution is adequate for most purposes.


There is an alternative for those who want better resolution, and that 
is the AFV and dBV alternate displays that can be dialed up in the VFOB 
area when CONFIG is set for TECH mode.  The resolution of AFV is 1 mVp-p 
and is the value of the receiver output.  dBV is relative to the 
receiver output level when the dBV scale was first entered and is in 1 
dB increments - that is just about as good as any analog meter commonly 
available - yes more precision is available in some meters, but they 
cost big bucks.


73,
Don W3FPR 


Lee Buller wrote:



Ladies and Gents.

I have been trying to follow the threads on IMD performance of the K3 
and the S-Meter thread of the K3.  Could someone explain (to a Liberal 
Arts Major - not an engineering type)  what the issues are here and 
why they are issues with this radio?  Maybe, I'm lost in all the 
hullabaloo.


Alsowhy is one person calling the S-Meter and the power connector 
"junk" that cannot be fixed?


Thank you for the education.

  

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Vic K2VCO]

Lee Buller wrote:


Alsowhy is one person calling the S-Meter and the power connector
"junk" that cannot be fixed?


The s-meter is only useful to give a rough reading of signal strength. 
It is good enough for RST reports.


However, the radio includes a built-in 'dBV' (this is in quotes for 
those who will say that it should be called something else) function 
which can provide an accurate measurement of relative signal strength 
when necessary.


Some people hate Powerpole connectors, others love them. I am of the 
latter persuasion. They need to be assembled carefully and then in my 
opinion they work well and are extremely convenient.


But then, I like PL259/SO239's too.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] [K3] in-band-IMD test

[Jim]

Current out the door models mod'ed???

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Harris
Sent: Thursday, November 13, 2008 11:08 AM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] in-band-IMD test

G'day,

The plot thickens.  We need to know more about these modifications.  Or 
have I missed something these past few weeks.

Regards,

Mike VP8NO

- Original Message - 
From: "Joe Subich, W4TV" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; 
Sent: Thursday, November 13, 2008 12:39 PM
Subject: RE: [Elecraft] [K3] in-band-IMD test


|
| Have these tests been made AFTER the AF board modification?
| Improvements to the power supply to the front panel can have
| a significant effect on this issue.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[David Pratt]

In a recent message, Jan Erik Holm <[EMAIL PROTECTED]> wrote ...

12V power connector, does not have a positive lock, i e can
come loose if radio is moved. Again IMO this is junk.


Have you assembled the connector correctly, Jim?  Both my K3 and my 
XV144 Anderson power connectors go in with a definite 'click' and 
neither of them have come apart unintentionally even when the equipment 
is moved.


Being digital, the S-meter has incremental steps of one S-point which is 
accurate enough for most practical purposes.  In any case, everyone is 
599 or 59 in contests ;-)


73

--
David G4DMP
Leeds, England, UK
--


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] [K3] in-band-IMD test

[Mike Harris]

G'day,

The plot thickens.  We need to know more about these modifications.  Or 
have I missed something these past few weeks.

Regards,

Mike VP8NO

- Original Message - 
From: "Joe Subich, W4TV" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; 
Sent: Thursday, November 13, 2008 12:39 PM
Subject: RE: [Elecraft] [K3] in-band-IMD test


|
| Have these tests been made AFTER the AF board modification?
| Improvements to the power supply to the front panel can have
| a significant effect on this issue.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] Questions from a Liberal Arts Major

[dj7mgq]

a very accurate scale in S-unit (5 dB) steps.


I assume you mean 6dB steps:

Page 156 
Page 142 


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Matt Palmer]

You mean the S-meter reads in S units (6db) how unique. Also the damn
powerpole thing has been beat to death over numerous threads on this
reflector. Read those and pray no one gets out their soapbox again.


Matt
KD8DAO
http://blog.MattIsKichigai.com



On Thu, Nov 13, 2008 at 10:44 AM, Jan Erik Holm <[EMAIL PROTECTED]> wrote:
> Lee Buller wrote:
>>
>>  Alsowhy is one person calling the S-Meter and the power connector
>> "junk" that cannot be fixed?
>>
> Maybe I should explain my point.
> S-meter, too coars since it can only show a 6 dB change.
> It´s been reported on this reflector that it was impossible
> to rectify/change that, i e to get better resolution more
> data points has to be produced by the radio.
> So bottom line, an S-meter that coarse IMO is junk, sorry
> but it´s my opinion.
> 12V power connector, does not have a positive lock, i e can
> come loose if radio is moved. Again IMO this is junk.
> This probably could be fixed, i e modify it for another type
> connector.
>
> And yes the K3 has a few other issues also but as I did say
> before nothing in life is perfect, I still love my K3 and
> would not like to be without it.
>
> 73 Jim SM2EKM
>
>
> ___
> Elecraft mailing list
> Post to: Elecraft@mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Jan Erik Holm]

Lee Buller wrote:
 
Alsowhy is one person calling the S-Meter and the power connector 
"junk" that cannot be fixed?



Maybe I should explain my point.
S-meter, too coars since it can only show a 6 dB change.
It´s been reported on this reflector that it was impossible
to rectify/change that, i e to get better resolution more
data points has to be produced by the radio.
So bottom line, an S-meter that coarse IMO is junk, sorry
but it´s my opinion.
12V power connector, does not have a positive lock, i e can
come loose if radio is moved. Again IMO this is junk.
This probably could be fixed, i e modify it for another type
connector.

And yes the K3 has a few other issues also but as I did say
before nothing in life is perfect, I still love my K3 and
would not like to be without it.

73 Jim SM2EKM


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] Questions from a Liberal Arts Major

[Joe Subich, W4TV]

Lee, 

> Alsowhy is one person calling the S-Meter 

Because some people do not understand the difference between an 
amateur transceiver and a $10,000 piece laboratory test equipment. 
The K3's S-meter circuit is derived form the IF DSP and provides 
a very accurate scale in S-unit (5 dB) steps.  It does not 
provide an analog voltage with infinite resolution.  

> and the power connector "junk" that cannot be fixed?

The power connector is an Anderson PowerPole and some people 
(unfairly) object to the use PowerPole connectors. 

In "liberal arts" terms, there are always those who expect a 
Ferrari or Maserati for the same price as a Chevrolet Cobalt. 

73, 

   ... Joe, W4TV 
 


> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of Lee Buller
> Sent: Thursday, November 13, 2008 9:22 AM
> To: Elecraft Reflector
> Subject: [Elecraft] Questions from a Liberal Arts Major
> 
> 
> 
> 
> Ladies and Gents.
> 
> I have been trying to follow the threads on IMD performance 
> of the K3 and the S-Meter thread of the K3.  Could someone 
> explain (to a Liberal Arts Major - not an engineering type)  
> what the issues are here and why they are issues with this 
> radio?  Maybe, I'm lost in all the hullabaloo.
> 
> Alsowhy is one person calling the S-Meter and the power 
> connector "junk" that cannot be fixed?
> 
> Thank you for the education.
> 
> Lee Buller - K0WA
> K3 SN 443
> K2 SN 1056
> 
> In our day and age it seems that Common Sense is in short 
> supply. If you don't have any Common Sense - get some Common 
> Sense and use it. If you can't find any Common Sense, ask for 
> help from somebody who has some Common Sense. Is Common Sense divine?
> 

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [Elecraft] [K3] in-band-IMD test

[Joe Subich, W4TV]

Have these tests been made AFTER the AF board modification? 
Improvements to the power supply to the front panel can have 
a significant effect on this issue. 


> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of JOHN
> Sent: Thursday, November 13, 2008 10:01 AM
> To: Elecraft@mailman.qth.net
> Subject: Re: [Elecraft] [K3] in-band-IMD test
> 
> 
> Hello,
> 
> Good job Alex!!! I was pointing out weak in the Channel IMD 
> characteristics of K3 for long time!!!
> 
> 73!
> John,SP2GGZ,N2KFC,YB1AQV,
> 

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] [K3] in-band-IMD test

[JOHN]

Hello,

Good job Alex!!! I was pointing out weak in the Channel IMD characteristics of 
K3 for long time!!!

73!
John,SP2GGZ,N2KFC,YB1AQV,


  
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] Questions from a Liberal Arts Major

[Kurt Pawlikowski]

Lee,

   Don't know about the connector issues (I suppose that might be a 
matter of personal preference). The S-Meter issue has to do with "fine" 
adjustments. Since the meter is a bar graph type, "blocks" are either 
lit or not. If, for instance, you are attempting to "see" the difference 
between 4.3 blocks and 4.4 blocks, they display the same (either 4 or 5 
blocks, depending on software design). Apparently, this design issue is 
also in the data given to a control computer. That is, instead of giving 
a "value" (i.e., 4.321), it is just mimicking the bar graph (i.e., 4 
"blocks"). So, if you're trying to make a comparative measurement 
between similar signals, unless they "happen" to be on the "edge" of two 
"block" values, they will look the same. While this is normal for this 
type of display, it is a little unusual for the computer data stream. 
That usually reflects "raw" data. Does that help? {'-)


   Regards,

   kurtt

   Kurt Pawlikowski, AKA WB9FMC
   The Pinrod Corporation
   [EMAIL PROTECTED]
   (773) 284-9500
   http://pinrod.com

Lee Buller wrote:



Ladies and Gents.

I have been trying to follow the threads on IMD performance of the K3 
and the S-Meter thread of the K3.  Could someone explain (to a Liberal 
Arts Major - not an engineering type)  what the issues are here and 
why they are issues with this radio?  Maybe, I'm lost in all the 
hullabaloo.


Alsowhy is one person calling the S-Meter and the power connector 
"junk" that cannot be fixed?


Thank you for the education.

Lee Buller - K0WA
K3 SN 443
K2 SN 1056

In our day and age it seems that Common Sense is in short supply. If 
you don't have any Common Sense - get some Common Sense and use it. If 
you can't find any Common Sense, ask for help from somebody who has 
some Common Sense. Is Common Sense divine?




___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] Questions from a Liberal Arts Major

[Lee Buller]

Ladies and Gents.

I have been trying to follow the threads on IMD performance of the K3 and the 
S-Meter thread of the K3.  Could someone explain (to a Liberal Arts Major - not 
an engineering type)  what the issues are here and why they are issues with 
this radio?  Maybe, I'm lost in all the hullabaloo.

Alsowhy is one person calling the S-Meter and the power connector "junk" 
that cannot be fixed?

Thank you for the education.

Lee Buller - K0WA
K3 SN 443
K2 SN 1056

In our day and age it seems that Common Sense is in short supply.  If you don't 
have any Common Sense - get some Common Sense and use it.  If you can't find 
any Common Sense, ask for help from somebody who has some Common Sense.  Is 
Common Sense divine?___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[Alexander Ponomarenko]

Barry N1EU wrote:

Alexander Ponomarenko-5 wrote:
  
yes PHONES-OUT on front panel(!!!) is different from rear panel PHONES 
or LINE OUT outs.


The plots from front-panel phones-out is better, but IMD spikes are
present.

plot withoot S9 signal: http://forum.cqham.ru/download.php?id=32055
S9   PRE OnAGC Off: http://forum.cqham.ru/download.php?id=32057
S9   PRE OnAGC SLOW: http://forum.cqham.ru/download.php?id=32056

Thanks for running the test again Alex!

First off, is this really IMD we're looking at?  Aren't you injecting a
single signal?  Isn't this harmonic distortion, not IMD?

Looking at the s9 agc off pre on plot, the worst "distortion" product is
still >60dB down.  It would be nice if we saw zero distortion products, but
I suspect that the distortion seen here is completely inaudible.

73,
Barry N1EU
  

Barry,

now I have only one-tone generator XG1 with S3 and S9 level.
But in my first message you can to see TWO-TONE in-band IMD
results for ic7800, ic756pro2, Flex-5k and K3 for S9 and S9+50 levels.
For all these Radios was used same measure-method on one table.
And of course AF-out for all it was from PHONES-out on FP.

s9+50 AGC-Fast PRE-On http://forum.cqham.ru/download.php?id=32004
s9 AGC-Fast PRE-On http://forum.cqham.ru/download.php?id=32004

These results from Alex UR0ID. The FireBox sound-card are no been 
overloaded.
But hope I get two-tone generator from Alex, and also check my K3 for 
two-tone IMD.


Alex de UR5LAM



___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] ANN: KComm version 1.5 released

[Julian, G4ILO]

Version 1.5 of KComm for Windows and Linux has been uploaded to my website.
This version improves upon or fixes issues that were noticed with the
previous version, including handling of different character sets. Now I can
read PSK31 conversations in Cyrillic, which I couldn't even do in MixW,
oddly enough.

-
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
Directoryhttp://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
-- 
View this message in context: 
http://n2.nabble.com/ANN%3A-KComm-version-1.5-released-tp1493751p1493751.html
Sent from the Elecraft mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[Barry N1EU]

Alexander Ponomarenko-5 wrote:
> 
> yes PHONES-OUT on front panel(!!!) is different from rear panel PHONES 
> or LINE OUT outs.
> 
> The plots from front-panel phones-out is better, but IMD spikes are
> present.
> 
> plot withoot S9 signal: http://forum.cqham.ru/download.php?id=32055
> S9   PRE OnAGC Off: http://forum.cqham.ru/download.php?id=32057
> S9   PRE OnAGC SLOW: http://forum.cqham.ru/download.php?id=32056
> 

Thanks for running the test again Alex!

First off, is this really IMD we're looking at?  Aren't you injecting a
single signal?  Isn't this harmonic distortion, not IMD?

Looking at the s9 agc off pre on plot, the worst "distortion" product is
still >60dB down.  It would be nice if we saw zero distortion products, but
I suspect that the distortion seen here is completely inaudible.

73,
Barry N1EU
-- 
View this message in context: 
http://n2.nabble.com/in-band-IMD-test-tp1491448p1493610.html
Sent from the [K3] mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[dj7mgq]

Hallo,


The Audio mod is a very simply! You just need to add simple two resistor
pararell on KIO3 module and replace one RFI choke! If anyone need mode just
send me mail and I will forward pdf direct !


Has this modification been blessed by Elecraft or is it an unofficial mod?

Is the PDF an official doc by Elecraft?

vy 73 de toby

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] [K3] Scan mode question/suggestion concerning the KRX3

[dj7mgq]

Hi,

I'm at work right now and have a spare moment, which has allowed me to  
think about the ARRL 10M Contest coming up in December. With the lack  
of sun spots these days, the contest will likely be a VHF affair,  
which led to the thought that one could call CQ on one frequency and  
scan the band at the same time.


I don't have the manual here, so can't check what it has to say. So I  
ask, has anyone tried to use the the KRX3 in scan mode while calling  
CQ on a run frequency?


I would assume that both receivers are sharing the same antenna, which  
means either the KRX3 scan needs to pause and/or be muted during the  
TX phases.


I do not think that the firmware allows this at present. Could this be  
an idea for Wayne's (very long) ToDo list or is the idea too silly?


vy 73 de toby



___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K3: in-band-IMD etc. what does this mean to a user?

[Geoffrey Mackenzie-Kennedy]

Fair enough, but if the sound card was being overdriven in their *two tone* 
tests, the same IMD products should appear in the two tone test trsults from 
all four types of receiver which is not the case. This assumes of course 
that the input levels to the sound card are the same plus minus a little 
during each test.


73,
Geoff
GM4ESD

- Original Message - 
From: "hank k8dd" <[EMAIL PROTECTED]>

To: "Ignacy" <[EMAIL PROTECTED]>; 
Sent: Thursday, November 13, 2008 5:07 AM
Subject: Re: [Elecraft] K3: in-band-IMD etc. what does this mean to a user?


And if you want to record your TX and RX audio it is very possible to
overdrive the sound card because the Line Out level is controlled by the AF
Gain control!

73HankK8DD



___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[e72x]

The Audio mod is a very simply! You just need to add simple two resistor
pararell on KIO3 module and replace one RFI choke! If anyone need mode just
send me mail and I will forward pdf direct !

73, E72X,



Alexander:

Sorry but I don't read Russian. What were the K3's AGC settings for the IMD
measurements? At a large input signal (S9+50 dB), using a "Fast" AGC time
constant will often result in poor IMD for conventional receivers using
analog type of AGC systems. I don't know the details of the K3's AGC system,
however.

Have you tried the S9+50 dB input signal with the "Slow" AGC setting?

73, Dean Straw, N6BV



Alexander Ponomarenko-5 wrote:
> 
> GA for all K3 users.
> So many guys has talks about perfect audio sound of K3.
> So many talks about "analog K3 sound" on e-ham.
> But how it possible if K3 have the so bad in-band IMD?
> You can read about "in-band-IMD-measurements" in russian here:
> http://forum.cqham.ru/viewtopic.php?t=17119&postdays=0&postorder=asc&&start=0
> 
> 

-- 
View this message in context: 
http://n2.nabble.com/in-band-IMD-test-tp1491448p1493383.html
Sent from the [K3] mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[e72x]

The Audio mod is a very simply! You just need to add simple two resistor
pararell on KIO3 module and replace one RFI choke! If anyone need mode just
send me mail and I will forward pdf direct !

73, E72X,



Alexander:

Sorry but I don't read Russian. What were the K3's AGC settings for the IMD
measurements? At a large input signal (S9+50 dB), using a "Fast" AGC time
constant will often result in poor IMD for conventional receivers using
analog type of AGC systems. I don't know the details of the K3's AGC system,
however.

Have you tried the S9+50 dB input signal with the "Slow" AGC setting?

73, Dean Straw, N6BV



Alexander Ponomarenko-5 wrote:
> 
> GA for all K3 users.
> So many guys has talks about perfect audio sound of K3.
> So many talks about "analog K3 sound" on e-ham.
> But how it possible if K3 have the so bad in-band IMD?
> You can read about "in-band-IMD-measurements" in russian here:
> http://forum.cqham.ru/viewtopic.php?t=17119&postdays=0&postorder=asc&&start=0
> 
> 

-- 
View this message in context: 
http://n2.nabble.com/in-band-IMD-test-tp1491448p1493379.html
Sent from the [K3] mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[e72x]

The Audio mod is a very simply! You just need to add simple two resistor
pararell on KIO3 module and replace one RFI choke! If anyone need mode just
send me mail and I will forward pdf direct !

73, E72X,



Alexander:

Sorry but I don't read Russian. What were the K3's AGC settings for the IMD
measurements? At a large input signal (S9+50 dB), using a "Fast" AGC time
constant will often result in poor IMD for conventional receivers using
analog type of AGC systems. I don't know the details of the K3's AGC system,
however.

Have you tried the S9+50 dB input signal with the "Slow" AGC setting?

73, Dean Straw, N6BV



Alexander Ponomarenko-5 wrote:
> 
> GA for all K3 users.
> So many guys has talks about perfect audio sound of K3.
> So many talks about "analog K3 sound" on e-ham.
> But how it possible if K3 have the so bad in-band IMD?
> You can read about "in-band-IMD-measurements" in russian here:
> http://forum.cqham.ru/viewtopic.php?t=17119&postdays=0&postorder=asc&&start=0
> 
> 

-- 
View this message in context: 
http://n2.nabble.com/in-band-IMD-test-tp1491448p1493378.html
Sent from the [K3] mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] [K3] - KRX3 filter choice

[GW0ETF]

Just had a Katiegram for my KRX3 which was ordered on February 1st:-)

At the moment my K3 has additional 500Hz (5 pole) and 250Hz (8 pole) filters
but I've ordered an 8 pole 400Hz to go with the KXR3; thought I may move the
500Hz 5 pole to the KXR3 and have both 8 pole filters in the main receiver.

Wondering now if I should instead go for another 500Hz 5 pole roofing filter
for the KXR3 and have it matched to the original? Would this make sense
should I want to use diversity rx (apologies - haven't really studied
this...)? The email says they can supply a matched unit for an extra $30 so
the cost would be the same.

Any comments before I confirm the order??

73, 

Stewart Rolfe, GW0ETF (K3 #145)

PS. Next dilemma may be whether to fit before CQWW or would that be just
tempting the Gods of fate way too much?!!
-- 
View this message in context: 
http://n2.nabble.com/-K3KRX3-filter-choice-tp1493370p1493370.html
Sent from the Elecraft mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[e72x]

The Audio mod is a very simply! You just need to add simple two resistor
pararell on KIO3 module and replace one RFI choke! If anyone need mode just
send me mail and I will forward pdf direct !

73, E72X,



Alexander:

Sorry but I don't read Russian. What were the K3's AGC settings for the IMD
measurements? At a large input signal (S9+50 dB), using a "Fast" AGC time
constant will often result in poor IMD for conventional receivers using
analog type of AGC systems. I don't know the details of the K3's AGC system,
however.

Have you tried the S9+50 dB input signal with the "Slow" AGC setting?

73, Dean Straw, N6BV



Alexander Ponomarenko-5 wrote:
> 
> GA for all K3 users.
> So many guys has talks about perfect audio sound of K3.
> So many talks about "analog K3 sound" on e-ham.
> But how it possible if K3 have the so bad in-band IMD?
> You can read about "in-band-IMD-measurements" in russian here:
> http://forum.cqham.ru/viewtopic.php?t=17119&postdays=0&postorder=asc&&start=0
> 
> 

-- 
View this message in context: 
http://n2.nabble.com/in-band-IMD-test-tp1491448p1493362.html
Sent from the [K3] mailing list archive at Nabble.com.

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

RE: [K3] [Elecraft] in-band-IMD test

[Arie Kleingeld PA3A]

Alex,

Good job!

73
Arie PA3A

-Oorspronkelijk bericht-
Van: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Namens Alexander Ponomarenko
Verzonden: donderdag 13 november 2008 9:49
CC: elecraft@mailman.qth.net
Onderwerp: Re: [K3] [Elecraft] in-band-IMD test


Barry,
yes PHONES-OUT on front panel(!!!) is different from rear panel PHONES 
or LINE OUT outs.

The plots from front-panel phones-out is better, but IMD spikes are
present.

plot withoot S9 signal: http://forum.cqham.ru/download.php?id=32055
S9   PRE OnAGC Off: http://forum.cqham.ru/download.php?id=32057
S9   PRE OnAGC SLOW: http://forum.cqham.ru/download.php?id=32056

Alex de UR5LAM


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] S-meter and other things

[Jan Erik Holm]

Yes indeed. IMO there are two things that are pure junk on the K3, 
S-meter and the 12V DC power connectors. Too bad it can´t get fixed.


Also I don´t like that the VOX gain changes with mic gain level, IMO
they should be independent.

Like anything in life nothing is perfect.

/ Jim SM2EKM
-
K7TV wrote:

between full S-units - with only full S-units shown you have no idea if you
are 6 dB or 1 dB from the next step. If you don't see a small decrease when
approaching the null, you are likely to turn the knob too fast and miss the
null altogether. My workaround was to turn off AGC and listen for the volume



___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [K3] [Elecraft] in-band-IMD test

[Alexander Ponomarenko]

Barry,
yes PHONES-OUT on front panel(!!!) is different from rear panel PHONES 
or LINE OUT outs.


The plots from front-panel phones-out is better, but IMD spikes are present.

plot withoot S9 signal: http://forum.cqham.ru/download.php?id=32055
S9   PRE OnAGC Off: http://forum.cqham.ru/download.php?id=32057
S9   PRE OnAGC SLOW: http://forum.cqham.ru/download.php?id=32056

Alex de UR5LAM

Alex Ponomarenko wrote:
2008/11/13 Barry N1EU <[EMAIL PROTECTED] 
>



Alexander Ponomarenko-5 wrote:
>
> all these measurements, for all radios has been via PHONE-OUT.
> There is two-tone measurements, but you can see these IMD even
with XG1
> set to s9-level.
> Here is my K3 with s9-signal from XG1:
> - ATT On http://forum.cqham.ru/download.php?id=32030
> - ATT/PRE Off http://forum.cqham.ru/download.php?id=32031
> - PRE On (it's terrible)
 http://forum.cqham.ru/download.php?id=32032
>

Please take two consecutive spectrum readings with PRE On, AGC Off
from the
headphone jack - take one with S9 signal from XG1 and take the
second with
the XG1 generator turned off (i.e., with no signal in the
passband).  Please
post these two spectra.

I suspect many of the spikes in your spectrum reading are not
related to the
received signal.


___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com