Re: [Elecraft] The K3 in comprison to the Big Guns

[David Yarnes]

I had a chance to get a pretty good look at the Icom 7700 at Dayton this 
year.  Also, a friend of mine who has one (and also has a K3) gave me a 
pretty good demo of the 7700's features.  I must say, the 7700 is 
impressive.  Big beautiful display, and lots of very interesting bells and 
whistles.  It's not hard to see why many folks gravitate towards a radio 
like this.  Interestingly, when I asked the Icom reps there what, besides 
only having one RX, was the difference between the 7700 and the 7800, they 
universally responded "not much"!  I haven't studied the 7700's performance 
ratings, but apparently they are not nearly as good as the K3.  But there 
are numerous features on the 7700 that will really tempt you--much of them 
are associated with that nice, big display.  It was easy to see the 
advantage the 7700 has over most Yaesu radios--much simpler menu access, 
etc.  Clearly the K3 can't fill everyone's want list, but I'm still pretty 
happy with my choice.  A 7700 (or maybe even a 7800) might be nice to have, 
but I still think my K3 does 95% of what I really want and need.  And I love 
the fact that I can just pick my K3 up and move it around with ease.  You 
won't be doing that with the 7700!  It's really apples and oranges, and each 
rig has advantages as well as gaps.  But I think from a purely performance 
standpoint, you just can't get much better than the K3.  There are plenty of 
nice extras on the K3 to remind you that it isn't just another ordinary 
radio.  But picking one over the other will be a real dilemma for some 
folks.  The only way to solve that problem is to get both, like my friend 
did!


Dave W7AQK

- Original Message - 
From: "Bob Serwy" <[EMAIL PROTECTED]>

To: "'Shane White'" <[EMAIL PROTECTED]>; 
Sent: Friday, May 16, 2008 1:09 AM
Subject: RE: [Elecraft] The K3 in comprison to the Big Guns



Maybe you need to ask Icom and Yaesu why they charge so much for their
rigs.


Bob Serwy - N9RS

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Shane White
Sent: Thursday, May 15, 2008 11:06 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] The K3 in comprison to the Big Guns


That's it, I'm going to ask the silly question.

How can the K3's receiver outperform that of the Icom IC-7800 and Yaesu
FTDX9000? These two radios cost in excess of $11,000 and weigh in at over
25Kg (55lbs)! The K3 costs about $2000 and weighs about 4Kg (8.5lbs). Yes
the K3 is deficient of a screen, internal PSU and some knobs but why on
earth is there such a difference in price and weight? Given this, how can
the K3's receiver outperform these other radios?

These questions keep bugging me. Those glossy Yaesu and Icom brochures
certainly don't help!
--
View this message in context:
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6.html
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Re: Subject: Re: [Elecraft] RTTY filter for K3

[Alan Bloom]

"Nyquist" in this context does not refer to the Nyquist criterion (i.e.
that the sample rate must be more than twice the highest signal
frequency).  It just means a filter that has no inter-symbol
interference at a certain symbol rate (baud rate).

It turns out that if you start with completely unfiltered symbols (a
series of infinitely-narrow impulses, one per symbol) a Nyquist filter
has the property that the frequency response is anti-symmetrical around
1/2 the symbol rate.  One example of a Nyquist filter is a raised-cosine
filter.  The frequency response (plotted on a linear, not dB scale) is
1.0 from zero Hz up to (1-alpha) * symbol_rate/2 and is zero for all
frequencies above (1+alpha) * symbol_rate/2.  Between 1-alpha and
1+alpha, the frequency response has the shape of a raised cosine,
smoothly going from 1.0 to 0.0.  If you plot that on graph paper, you
can see that the frequency response is anti-symmetrical about
symbol_rate/2.  (Alpha is a design parameter - the smaller the alpha the
sharper the cutoff.)

It is much easier to make a Nyquist filter digitally than with analog
components, but you could approximate one with coils and capacitors. 
Actually, even the digital filter is an approximation since it
theoretically has to have an impulse response that extends from
-infinity to +infinity.

That's probably more than you wanted to know.  :=)

Al N1AL


On Mon, 2008-05-19 at 18:35, Art wrote:
> I must be confused by this filter discussion. Is not a Nyquist filter by 
> its very definition a digital filter? Not directly comparable to the 
> crystal filters in the K3 or any other rig.
> 
> I would have supposed a Nyquist filter is one that samples at least 
> twice per cycle at the highest observed frequency.
> 
> As to what comes out of crystal filters, i.e. rtty tones, different 
> discussion. If I have the processing chain figured correctly crystal 
> filter output is then sampled by the audio card.
> 
> I'm not a filter designer. Just asking based on previous experiences.
> 
> 73 Art
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Re: [Elecraft] K3 noise-blanker

[David Yarnes]

I also have both, and I concur.

Dave W7AQK

- Original Message - 
From: "Tom Childers, N5GE" <[EMAIL PROTECTED]>

To: "JIM DAVIS" <[EMAIL PROTECTED]>
Cc: 
Sent: Monday, May 19, 2008 7:13 PM
Subject: Re: [Elecraft] K3 noise-blanker


On Mon, 19 May 2008 13:17:48 -0700, you wrote:


Gentlemen,

I'm really interested in the K3 but what I'm asking of anyone on this 
reflector is how GOOD IS

IT???
I presently use a TT ORION which has a fantastic 9mhz. (hardware) blanker 
and has made all the
difference in the world for my being able to copy weak signals, especially 
since our typical
noise level here is S-9+ without it!!!  So short of my having to MOVE 
somewhere else (not feasible
at this time!!!) has anyone COMPARED the i.f noise blankers of both the K3 
and the TT Orion

yet???

Many thanks,

Jim Davis/nn6ee
"Newbie on the reflector!"
___

[snip]

I have an Orion II and K3 SN 806.  The K3 is a much better rig overall than 
the

Orion II and the noise blanker is very much better.

Tom, N5GE - SWOT 3537 - Grid EM12jq

"Those who would give up
Essential Liberty to
purchase a little Temporary
Safety deserve neither
Liberty nor Safety"

An excerpt from a letter
written in 1755 from the
Assembly to the Governor
of Pennsylvania.

Support the entire Constitution, not
just the parts you like.

http://www.n5ge.com
http://www.eQSL.cc/Member.cfm?N5GE

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RE: [Elecraft] Buddipole stuff at Dayton

[Ron D'Eau Claire]

Very interesting. That automatic Buddipole reminds me of C3PO's skinny
younger brother. 

Ron AC7AC

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Monday, May 19, 2008 5:48 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Buddipole stuff at Dayton


A friend of mine, K8EAB, took some pictures at Dayton of the new stuff 
at Buddipole.

"Several new Buddipole Products were shown for the first time at the Dayton
Hamvention ... I saw the "Automatic Buddipole" at the QRP Vendor Night
presentation, along with a compact 40-amp super-cap power supply ... the
Automatic Buddipole will have a remote control for bandswitching ... At a
Saturday evening dinner, Chris and Budd showed the new Buddipole Rotor
Control Box ... There also were prototypes of a 100-watt Dummy Load and a
new shock-corded mast ... another product soon to be available is a
capacitive hat ...

No information on availability dates or prices, but you can bet if these
products were shown at Dayton, it won't be too long until 
you can place your order ... 

I got permission to post photos that I took ... 

http://picasaweb.google.com/weymouth67/BuddipoleAtDayton2008 


73, Wey ...
K8EAB"

Stan
KB4IA

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[Elecraft] RX/TX problem

[Mike Kasrich]

Last week I was on the list when my K-3 went belly up.  The support 
folks were on top of the problem right away. Kudos to them.  The problem 
appears to be an intermittent socket/connection between the txco and the 
ref board.  When pressure is applied down on the txco towards the front 
shield the RX/TX comes to life and the synth calibrates.  Why the 
failure happened in the first place is a mystery since the radio was 
working fine then quit. 


In any event it would appear to be a simple enough fix at this point.

73 all
Mike/aj9c

P.S. Despite the problem I still got on the list for a second K-3 at Dayton!

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Re: [Elecraft] Interesting Stuff At Dayton

[David Yarnes]

Absolutely correct Julian.  It is the combo of sound card and software that 
does it for you, but it does a very credible job of it I might add.  I know 
Elecraft has thoughts of adding a bandscope of some sort, so keep the faith! 
Your prayers may be answered.  I just thought it was kind of interesting how 
Larry Phipps had incorporated all this together into a very nice little 
package.  The sound card is critical of course, and most laptops don't have 
one that is sufficient.  But I think if you check Larry's website and/or his 
Yahoo group site you will find some recommendations.  Besides, it could be 
something of a wait for Elecraft to get around to following up on their 
indicated desire to produce a bandscope.  In the meantime, this could be a 
relatively inexpensive way to accomplish much the same thing.


Dave W7AQK

- Original Message - 
From: "G4ILO" <[EMAIL PROTECTED]>

To: 
Sent: Monday, May 19, 2008 1:39 AM
Subject: Re: [Elecraft] Interesting Stuff At Dayton

It appears to me that it would be a second receiver only with the aid of a
PC, sound card and SDR software.

What I would like to see is an external bandscope that does not require a
computer. Either it would be completely self contained, or it would use an
inexpensive portable LCD TV for its display. Perhaps Elecraft will come up
with something like this in the future?

-
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
--
View this message in context: 
http://www.nabble.com/Interesting-Stuff-At-Dayton-tp17308788p17313629.html

Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] K3 noise-blanker

[Tom Childers, N5GE]

On Mon, 19 May 2008 13:17:48 -0700, you wrote:

>Gentlemen,
>
>I'm really interested in the K3 but what I'm asking of anyone on this 
>reflector is how GOOD IS 
>IT???
>I presently use a TT ORION which has a fantastic 9mhz. (hardware) blanker and 
>has made all the
>difference in the world for my being able to copy weak signals, especially 
>since our typical
>noise level here is S-9+ without it!!!  So short of my having to MOVE 
>somewhere else (not feasible
>at this time!!!) has anyone COMPARED the i.f noise blankers of both the K3 and 
>the TT Orion
>yet???
>
>Many thanks,
>
>Jim Davis/nn6ee
>"Newbie on the reflector!"
>___
[snip]

I have an Orion II and K3 SN 806.  The K3 is a much better rig overall than the
Orion II and the noise blanker is very much better.

Tom, N5GE - SWOT 3537 - Grid EM12jq

"Those who would give up 
Essential Liberty to 
purchase a little Temporary 
Safety deserve neither 
Liberty nor Safety" 

An excerpt from a letter 
written in 1755 from the 
Assembly to the Governor 
of Pennsylvania.

Support the entire Constitution, not 
just the parts you like.

http://www.n5ge.com
http://www.eQSL.cc/Member.cfm?N5GE

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[Elecraft] RE: A real bandscope

[Dave Agsten]

A bandscope like the Flex 5000A's would be ideal. It works great.as does 
the radio, even on CW since I have no need for anything close to 50 wpm. Keep 
in mind that the Flex 5000 uses it's own, high performance sound card, not a 
typical PC sound card. But there are knobs and buttons on the K3. I still have 
to have a radio with knobsa K3 and a K2. I may control these rigs from 
a PC at times, but still love to tune and listen. It will be interesting to see 
what evolves for a bandscope with the K3 even though I probably will not be 
interested in one.

73,
Dave N8AG

K3 #414 


  
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Subject: Re: [Elecraft] RTTY filter for K3

[Art]

I must be confused by this filter discussion. Is not a Nyquist filter by 
its very definition a digital filter? Not directly comparable to the 
crystal filters in the K3 or any other rig.


I would have supposed a Nyquist filter is one that samples at least 
twice per cycle at the highest observed frequency.


As to what comes out of crystal filters, i.e. rtty tones, different 
discussion. If I have the processing chain figured correctly crystal 
filter output is then sampled by the audio card.


I'm not a filter designer. Just asking based on previous experiences.

73 Art
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[Elecraft] Wiring Headphones for K3

[David and Dianne on Comcast]

Hi Everyone,

I'm in the process of wiring a stereo jack onto old faithful monoral 
headphones for use on the K3. (The phones are not reversible when worn).


When the sub receiver arrives, I want the main receiver in the left 
channel and the sub receiver in the right channel.


For K3 use with a stereo plug, is the left channel on the jack tip or 
the jack sleeve?


I could not find any information in the owners or assembly manuals on 
this. It may be in there but I cold not find it.


Please no speculation as I need to know for certain so I don't have to 
do this over again.


Reply on or off the reflector.

Thanks in advance.

73 de N1LQ-Dave
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[Elecraft] Buddipole stuff at Dayton

[[EMAIL PROTECTED]]

A friend of mine, K8EAB, took some pictures at Dayton of the new stuff 
at Buddipole.


"Several new Buddipole Products were shown for the first time
at the Dayton Hamvention ... I saw the "Automatic Buddipole" at
the QRP Vendor Night presentation, along with a compact 40-amp
super-cap power supply ... the Automatic Buddipole will have a
remote control for bandswitching ...
At a Saturday evening dinner, Chris and Budd showed the new
Buddipole Rotor Control Box ...
There also were prototypes of a 100-watt Dummy Load and a new
shock-corded mast ... another product soon to be available is
a capacitive hat ...

No information on availability dates or prices, but you can bet
if these products were shown at Dayton, it won't be too long until 
you can place your order ... 

I got permission to post photos that I took ... 

http://picasaweb.google.com/weymouth67/BuddipoleAtDayton2008 



73, Wey ...
K8EAB"

Stan
KB4IA

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Re: [Elecraft] a real bandscope

[John Klewer]

If you can find one, the Clifton Laboratories Z90 or Z91 is a pretty 
nice standalone unit as well.


John, N6AX




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[Elecraft] K3 #642 on the air

[Fred Jensen]

KEVIN: If you see this, my S/N is 642, not 624.  Not only did I QLF it 
on the air in ECN, I remembered it all wrong as well.  I think it's 
called "age." :-(


ALL:  Assembly went really great, no problems; follow the directions. 
Lots of screws, multiple kinds of washers, and a few nuts [what would 
ham radio be without a few nuts]; a muffin tin or two and a ruler helps 
a lot.  Two momentary panics:  One after the KPA3 was done and I 
couldn't get the power above about 12W.  As a last resort :-) I read the 
manual and found out the CONFIG:PAio menu, which was turned ON, only 
applies if you have the IO module installed but not the amp itself. 
Proceeding up the choices, I then found CONFIG:PA, turned it to 'nor', 
and 100W wafted from my beam.


Other panic: I have a little Radio Shack audio amp I use to get my 
radios up to afterburner roar since my hearing aids don't work under the 
headphones.  I tried it, and the AF Gain was about 9 o'clock for good 
listening.  Later hooked it up again, and virtually no sound from the 
radio, even with the AF Gain maxed out.  No antenna -- end of panic. 
This is a vy quiet radio!


At the tool store in town, I picked up 3 or 4 little stainless surgical 
clamps awhile ago.  They are very useful for getting screws started 
without dropping them into the guts of the radio.  I had to use a 
fingernail file to round off the mini-coax plugs from the Ref Osc, but 
that was easy.  No other issues.  This is a clean kit for sure.


I've had a couple of weeks with it now and I can't really come up with 
my top ten "likes," there are so many.  But I know a big one is that the 
radio comes alive right after calibration in a highly usable state 
without much menu tweaking.  Just enable the modules you have, and 
you're on the air, mess around with the menu entries at your leisure.


Nice job Elecraft!  I'm a happy ham.  We'll try it out in WPX CW this 
weekend after #3 grandson Joe gets married Sat.  Most everyone will have 
the K6 mult by the time I get on.


73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2008 Cal QSO Party  4-5 Oct 08
- www.cqp.org
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Re: [Elecraft] a real bandscope

[David F. Reed]

For me, I liked my old Heathkit  (I admit I cannot recall the number, 
SB-620 or something like that, but in recent memory (good enough to be 
reliable) I liked the one in the IC-781, even better than the one in the 
IC-7800, and would like that sort of display for the spectrum scope, but 
on a nice flat panel, and I agree, it would be nice to not require a 
computer (I don;t care if it has it built in, just not another overhead 
for the shack computer...


73 de Dave, W5SV
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[Elecraft] K3/10 kit shipped, ordered 12/21

[WY5Q]

Got my Madelyngram stating my K3/10 kit shipped, which was ordered December
21st.

Woohoo!

Still gotta get another bag of concrete in the hole for the post for my
ZeroFive 43' vertical, and run the Davis RF Bury Flex coax (shipping
tomorrow) under my house.
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Re: [Elecraft] RTTY filter for K3

[Alan Bloom]

Good point.  It seems like an adaptive equalizer should work so long as
propagation hasn't totally garbaged the signal.  However, it would
greatly increase the complexity of the demodulator.  But maybe not if
the equalizer assumes a simple model of the transmit filter and makes
the a priori assumption that the channel does not change with time (i.e.
ignores propagation).

Al N1AL

On Mon, 2008-05-19 at 14:59, David Woolley (E.L) wrote:
> Alan Bloom wrote:
> 
> > 
> > The problem is that different RTTY transmitters use different amounts of
> > filtering.  However I suspect that a "Nyquist" receive filter designed
> > to compensate a typical/average transmit filter probably would have
> > pretty good performance on most received signals.  Does anyone know if
> > this has ever been tried?
> 
> With digital filters, one ought to be able to use the sort of adaptive 
> filters used in modems, where the filter coefficients are adjusted by 
> comparing the actual signal against the expected signal.  Modems send a 
> known training signal, to get fast initial convergence, but if the 
> signal is at least marginally decodable, I would have though it would be 
> possible get the filter to converge.  One could probably start by making 
> assumptions about the transmit filter and using known information about 
> the receiver.
> 
> This tactic will work better for synchronous systems, like PSK, but I 
> would have thought it must be possible to train a filter off an 
> asynchronous signal as well, although one might have solve for the 
> signalling unit centre position after receiving the whole character.
> 

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RE: [Elecraft] WHERE ARE THE KPAs

[Manuel Maseda]

Hi Eric,

How are things going with the KRX3 shipments?

73,
Manuel  W4SSB

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Eric Swartz - WA6HHQ,
Elecraft
Sent: Monday, May 19, 2008 7:32 PM
To: Stan Rife
Cc: Elecraft
Subject: Re: [Elecraft] WHERE ARE THE KPAs

These are on hold and will not make it back into the lab until at least the
end of the year at the earliest. We're fully committed right now on the K3
and will be so through the end of the year.


73, Eric  WA6HHQ
(Back from Dayton and Tired! :-)

Stan Rife wrote:
>Eric/Wayne, can you give us a tidbit to tide us over on this 
> subject. I know you guys are busy with the K3, but we would at least 
> like to know that the KPAs are forthcoming.
>
>How about an update.
>
> Stan
> W5EWA
> Houston, TX
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Re: [Elecraft] WHERE ARE THE KPAs

[Eric Swartz - WA6HHQ, Elecraft]

These are on hold and will not make it back into the lab until at least 
the end of the year at the earliest. We're fully committed right now on 
the K3 and will be so through the end of the year.



73, Eric  WA6HHQ
(Back from Dayton and Tired! :-)

Stan Rife wrote:
   Eric/Wayne, can you give us a tidbit to tide us over on this 
subject. I know you guys are busy with the K3, but we would at least 
like to know that the KPAs are forthcoming.


   How about an update.

Stan
W5EWA
Houston, TX

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[Elecraft] WHERE ARE THE KPAs

[Stan Rife]

   Eric/Wayne, can you give us a tidbit to tide us over on this 
subject. I know you guys are busy with the K3, but we would at least 
like to know that the KPAs are forthcoming.


   How about an update.

Stan
W5EWA
Houston, TX

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Re: [Elecraft] OT: stay away from these frequencies

[Dave_VK]

Is it a coincidence the Chinese over horizon radar has been silent on 40m the
last week?



DOUGLAS ZWIEBEL wrote:
> 
> According to the scrolling banner on the CQ Magazine home page, the
> Chinese are using 7050, 7060, and 14270 for disaster communication.
> It is urged to stay clear of these frequencies.
> 
> I don't know if this is accurate or not, but why take a chance?  If
> this was already posted here, sorry for the duplicate posting.
> 
> de Doug KR2Q
> 
> 

-- 
View this message in context: 
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[Elecraft] NAQCC Sprint Wednesday night!

[NAQCC]

NAQCC Sprint Wednesday night!
This coming Wednesday evening will be the monthly NAQCC Sprint for May, 2008.

I will refer you to the proper URL:

http://www.arm-tek.net/~yoel/sprint200805.html

There you will find all the details as to time, frequencies, this month's 
Special Award, which will be awarded to the one working the most different call 
areas in the USA.

This is a monthly event that caters to the CW veteran, the CW newcomer, 
straight key and bug fans. All are welcome to participate; but you must use QRP 
power levels to compete for awards.

Come join us and have a real good time!

73 de Dave VA3RJ
NAQCC #0004

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Re: [Elecraft] RTTY filter for K3

[David Woolley (E.L)]

Alan Bloom wrote:



The problem is that different RTTY transmitters use different amounts of
filtering.  However I suspect that a "Nyquist" receive filter designed
to compensate a typical/average transmit filter probably would have
pretty good performance on most received signals.  Does anyone know if
this has ever been tried?


With digital filters, one ought to be able to use the sort of adaptive 
filters used in modems, where the filter coefficients are adjusted by 
comparing the actual signal against the expected signal.  Modems send a 
known training signal, to get fast initial convergence, but if the 
signal is at least marginally decodable, I would have though it would be 
possible get the filter to converge.  One could probably start by making 
assumptions about the transmit filter and using known information about 
the receiver.


This tactic will work better for synchronous systems, like PSK, but I 
would have thought it must be possible to train a filter off an 
asynchronous signal as well, although one might have solve for the 
signalling unit centre position after receiving the whole character.



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

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Re: Re:[Elecraft] Fwd: K3 noise-blanker

[ab2tc]

Yes indeed we are out here. I for my part is quite happy with the K3 noise
blanker. You are not mentioning the nature of your noise. Mine is the
scratchy 120Hz noise emitted by power lines. The K3 noise blanker is quite
effective in removing it. I use a combination of the hardware and the DSP
noise blanker. I do not have any TT transceivers nor the Pro III so can't
help you with a comparison there. The noise blanker in the K3 is one of the
reasons I spent the money to upgrade from my IC-718 which otherwise
performed to my satisfaction. I had confidence in the K3's noise blanker as
there are before/after audio clips out there. I can send you one if you are
interested. I think I still have one somewhere. Right now it's raining so
the noise is absent.

BTW I am working with the power company and have had some success in getting
problems fixed, but since last fall there is a stubborn source that so far
has defied detection. I think I know where the source is (down to three
poles), but unfortunately the National Grid tech doesn't agree with me. This
is constant struggle anyway since new problems are constantly popping up so
I decided even if I were to ultimately succeed in getting this particular
problem fixed, I need a working secondary defense and the K3 is just that.

Knut - AB2TC

JIM DAVIS-11 wrote:
> 
> 
> 
> 
> Many thanks Wayne for your reply and I will ask Lisa about it as well, but
> there has to be others 
> out here
> as well that have done similar comparisons!
> 
> Jim/nn6ee
> 
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Re: [Elecraft] Fwd: a real bandscope

[n4lq]

With the Flex Radio, you don't have a choice. You must use the computer or 
you have no radio. Also, as good as the Flex's receiver is, it can't 
transmit CW worth a hoot and probably never will. It's got a clunky, slow 
and loud relay that will never be capable of satisfying us QSK types. For 
SSB, it is fine.


I would like to see a bandscope adapter with an IF input and VGA output for 
use with a PC monitor. Things get complicated however when you want point 
and click tuning as on the Flex. I guess the adapter needs a mouse port!
I guess the bottom line is: How much would one be willing to pay for this? 
Personally I would pay quiet a bit for a bolt on bandscope. Something as 
good as the Flex bandscope intregated into the K3 would make ICOM look 
second rate.



Steve Ellington
[EMAIL PROTECTED]
- Original Message - 
From: "Joe Word" <[EMAIL PROTECTED]>

To: 
Sent: Monday, May 19, 2008 4:17 PM
Subject: [Elecraft] Fwd: a real bandscope



I alteady sent this, but do not see the postion... so here it is again.


I vote for a stand alone bandscope. I am tied to a computer 8 hours a
day and don't want to be tied to one in my hobby. The IC-756PRO III
stays until the K3 has one.

If we have to have a computer, might as well have a Flex Radio.


Joe  N9VX

K3 #841
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No virus found in this incoming message.
Checked by AVG.
Version: 8.0.100 / Virus Database: 269.23.21/1454 - Release Date: 5/19/2008 
7:44 AM


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Re:Fwd: [Elecraft] K3 noise-blanker

[JIM DAVIS]

Many thanks Wayne for your reply and I will ask Lisa about it as well, but there has to be others 
out here

as well that have done similar comparisons!

Jim/nn6ee
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[Elecraft] Fwd: a real bandscope

[Joe Word]

I alteady sent this, but do not see the postion... so here it is again.


I vote for a stand alone bandscope. I am tied to a computer 8 hours a
day and don't want to be tied to one in my hobby. The IC-756PRO III
stays until the K3 has one.

If we have to have a computer, might as well have a Flex Radio.


Joe  N9VX

K3 #841
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[Elecraft] K3 noise-blanker

[JIM DAVIS]

Gentlemen,

I'm really interested in the K3 but what I'm asking of anyone on this reflector is how GOOD IS 
IT???

I presently use a TT ORION which has a fantastic 9mhz. (hardware) blanker and 
has made all the
difference in the world for my being able to copy weak signals, especially 
since our typical
noise level here is S-9+ without it!!!  So short of my having to MOVE somewhere 
else (not feasible
at this time!!!) has anyone COMPARED the i.f noise blankers of both the K3 and 
the TT Orion
yet???

Many thanks,

Jim Davis/nn6ee
"Newbie on the reflector!"
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Re: [Elecraft] RTTY filter for K3

[Alan Bloom]

Re: using Nyquist filters for RTTY.

One complication I didn't mention is the fact that, because angle
modulation (FM, FSK, PM, PSK) is fundamentally non-linear, the
pre-detection and post-detection filters are fundamentally different.

With linear modulation types (AM, on-off keying, QPSK, QAM), the
spectrum of the pre-detection filter will appear the same at baseband. 
For example, if the IF filter has a 0.3-alpha Nyquist bandpass response,
the resulting post-detection response at baseband will also be a
0.3-alpha Nyquist lowpass response.

But that's not true with angle modulation.  Using a Nyquist
pre-detection filter does not result in a Nyquist response after
detection.  That is why most FSK and MSK systems use non-Nyquist filters
(typically Gaussian).

To use a Nyquist filter with FSK you would have to use a pre-detection
filter much wider than the baud rate (as is done now for RTTY) and then
add a Nyquist post-detection filter that would further tighten up the
frequency response without causing additional inter-symbol interference.

There may be a good reason why this is not usually done.  When I get
time maybe I'll do some Mathcad simulations to see if it looks like this
could work.

> Some RTTY decoders take advantage of the tone separation and actually 
> employ a pair of detectors, one for each tone, and use the outputs 
> differentially to get some protection from selective fading.

I think it is not just for selective fading but also for interference
that occurs primarily on one of the two tones.

It might be possible to use separate Nyquist filters and detectors for
the two tones, treating each one as if it were a separate on/off-keyed
signal.  If the transmitted signal is not filtered too heavily (i.e.
jumps quickly from one tone to the other) it seems like that should
work.

Al N1AL


On Mon, 2008-05-19 at 07:00, Lyle Johnson wrote:
> >> Using a excessively narrow filter on RTTY is a balancing act. 
> >>
> >> If the bandwidth is too narrow the tones tend to become "smeared" 
> >> - the transitions become less easy to detect (in other words, 
> >> the "eye" begins to close).  However, narrowing the bandwidth 
> >> also reduces the amount of QRM/QRN making it through the filter 
> >> and to the decoder/detector.
> > 
> > How about using a Nyquist filter?
> > 
> > A Nyquist filter is one that results in no inter-symbol interference. 
> 
> One of the difficulties with RTTY is that the tone spacings are so wide. 
>   For a 45 baud FSK signal, a shift of about 30 Hz would minimize the 
> occupied bandwidth and have no intersymbol interference.  But standard 
> practice is to use 170 Hz or 200 Hz shift. [ 200 Hz Shift is about right 
> for 300 baud FSK, which is what we used (and why we used it) for HF 
> packet some 25 years ago.  And optimized it for common 400 Hz to 500 Hz 
>   wide "CW" crystal filters of that era. ]
> 
> Thus, the rise of the dual tone filter (K3) and its work-alikes in 
> various radios and demodulators, with fairly tight filters around each 
> tone to pass it along with its significant sidebands.  But the overall 
> IF passband still needs to be wide enough to pass both tones and their 
> sidebands. I imagine you can observe all of this on your "P1".
> 
> Some RTTY decoders take advantage of the tone separation and actually 
> employ a pair of detectors, one for each tone, and use the outputs 
> differentially to get some protection from selective fading.  170 Hz 
> spacing is probably too close for such protection -- 850 Hz spacing 
> would be better, but that requires an even wider IF passband...
> 
> Some soundcard-based RTTY programs support really narrow shifts, but 
> such signals are not often heard at this QTH.  Maybe it is because 
> everyone is listening and no one is calling CQ?
> 
> Enjoy!
> 
> Lyle KK7P

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RE: [Elecraft] OT: stay away from these frequencies

[Kevin Rock]

I started monitoring those frequencies last week when this was first announced. 
 I have heard a lot of activity but all of it is in Spanish.  
   Kevin.  KD5ONS


-Original Message-
>From: Ron D'Eau Claire <[EMAIL PROTECTED]>
>Sent: May 19, 2008 12:00 PM
>To: 'Elecraft Reflector' 
>Subject: RE: [Elecraft] OT: stay away from these frequencies
>
>Yes. From the ARRL Newsletter:
>
>"On Monday, May 12 at 0628 UTC, a magnitude 7.8 earthquake hit Sichuan,
>China. The Chinese Radio Sports Association, the Chinese IARU
>Member-Society, has designated the following frequencies for emergency
>services involved in the rescue: 14.270, 7.050 and 7.060 MHz. The ARRL
>encourages US amateurs to be aware of the emergency operations on those
>three frequencies."
>
>More at http://www.arrl.org/news/stories/2008/05/13/10095/
>
>Ron AC7AC
>
>
>-Original Message-
>According to the scrolling banner on the CQ Magazine home page, the Chinese
>are using 7050, 7060, and 14270 for disaster communication. It is urged to
>stay clear of these frequencies.
>
>I don't know if this is accurate or not, but why take a chance?  If this was
>already posted here, sorry for the duplicate posting.
>
>de Doug KR2Q
>
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Re: [Elecraft] OT: stay away from these frequencies

[n4lq]

really important to know this. I'll have to aim my rhombic the other way now
Steve Ellington
[EMAIL PROTECTED]
- Original Message - 
From: "Ron D'Eau Claire" <[EMAIL PROTECTED]>

To: "'Elecraft Reflector'" 
Sent: Monday, May 19, 2008 3:00 PM
Subject: RE: [Elecraft] OT: stay away from these frequencies


Yes. From the ARRL Newsletter:

"On Monday, May 12 at 0628 UTC, a magnitude 7.8 earthquake hit Sichuan,
China. The Chinese Radio Sports Association, the Chinese IARU
Member-Society, has designated the following frequencies for emergency
services involved in the rescue: 14.270, 7.050 and 7.060 MHz. The ARRL
encourages US amateurs to be aware of the emergency operations on those
three frequencies."

More at http://www.arrl.org/news/stories/2008/05/13/10095/

Ron AC7AC


-Original Message-
According to the scrolling banner on the CQ Magazine home page, the Chinese
are using 7050, 7060, and 14270 for disaster communication. It is urged to
stay clear of these frequencies.

I don't know if this is accurate or not, but why take a chance?  If this was
already posted here, sorry for the duplicate posting.

de Doug KR2Q

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No virus found in this incoming message.
Checked by AVG.
Version: 8.0.100 / Virus Database: 269.23.21/1454 - Release Date: 5/19/2008 
7:44 AM


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RE: [Elecraft] OT: stay away from these frequencies

[Ron D'Eau Claire]

Yes. From the ARRL Newsletter:

"On Monday, May 12 at 0628 UTC, a magnitude 7.8 earthquake hit Sichuan,
China. The Chinese Radio Sports Association, the Chinese IARU
Member-Society, has designated the following frequencies for emergency
services involved in the rescue: 14.270, 7.050 and 7.060 MHz. The ARRL
encourages US amateurs to be aware of the emergency operations on those
three frequencies."

More at http://www.arrl.org/news/stories/2008/05/13/10095/

Ron AC7AC


-Original Message-
According to the scrolling banner on the CQ Magazine home page, the Chinese
are using 7050, 7060, and 14270 for disaster communication. It is urged to
stay clear of these frequencies.

I don't know if this is accurate or not, but why take a chance?  If this was
already posted here, sorry for the duplicate posting.

de Doug KR2Q

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[Elecraft] Re: K3: will sidetone ever go from 300 to 1000 by 10 Hz increments?

[wayne burdick]

On May 19, 2008, at 11:08 AM, O. Johns wrote:

Can Lyle or someone tell me if there are plans to have the sidetone 
run from 300 to 1000 by 10 Hz increments in some future firmware 
version?  Is there some basic reason it can't be done?  I note that 
page 9 of the K3 Owners Manual C1 says that the sidetone is adjustable 
from 300 to 1000 Hz.  Is that / will that be / so?


This can be done, but not in the near term because of more pressing 
firmware needs. I'll be looking at this when I look at changing the DSP 
control granularity to 10 Hz.


73,
Wayne
N6KR

---

http://www.elecraft.com

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[Elecraft] OT: stay away from these frequencies

[DOUGLAS ZWIEBEL]

According to the scrolling banner on the CQ Magazine home page, the
Chinese are using 7050, 7060, and 14270 for disaster communication.
It is urged to stay clear of these frequencies.

I don't know if this is accurate or not, but why take a chance?  If
this was already posted here, sorry for the duplicate posting.

de Doug KR2Q
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[Elecraft] K3: will sidetone ever go from 300 to 1000 by 10 Hz increments?

[O. Johns]

Can Lyle or someone tell me if there are plans to have the sidetone  
run from 300 to 1000 by 10 Hz increments in some future firmware  
version?  Is there some basic reason it can't be done?  I note that  
page 9 of the K3 Owners Manual C1 says that the sidetone is adjustable  
from 300 to 1000 Hz.  Is that / will that be / so?


Sorry for the nonsense below.  I wrote before thinking.  Actually, a  
serial number specifying one of the 15 different pitches in the range  
from 300 to 1000 Hz by 50 Hz increments can be saved in ONE four-bit  
register (2 to the 4th = 16).  And a serial number specifying one of  
the 71 different pitches in the range from 300 to 1000 by 10 Hz  
increments can be saved, with lots of room to spare, in TWO four-bit  
registers (2 to the 8th = 256).  So at worst, the storage used would  
be one byte, not nine.


***
Incorrect information posted earlier is:
I wonder if the problem here is memory register space.  From 300 to  
1000 with 50 Hz increments  would be 15 different pitches, just shy of  
two bytes of memory space to record.  The same range with 10 Hz  
increments, it would be 71 different pitches, requiring nine bytes of  
memory space to record.



73,
Oliver Johns
W6ODJ
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[Elecraft] K3 in Aquitaine

[Peter Connors, F5VNB]

Factory built ordered 16 November.
Katiegram 22 April, 1.8kHz filter and KRX3 on back order.
Arrived Samazan 10.33 this morning via Santa Cruz, San Jose, Louisville 
KY, Köln (Cologne), Marseille, Bordeaux and Carbon Blanc.

Another K3 in France - and I'm a bit closer to WAUPS...

73, Pete Connors F5VNB/G4PLZ

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Re: [Elecraft] a real bandscope

[ab2tc]

Well, I have my LP-PAN on order and can't wait to receive it. I ordered mine
assembled so I may have to wait a couple of weeks more for it. I don't mind
being tethered to a computer while operating. Truth is I have become so
dependent on my logging program (HRD), QRZ.com, DX cluster, etc. that I
can't imagine operating without one. I even bring a wireless laptop when
operating outside on nice days in the summer.
And if band activity is low, I can spend the lulls browsing my forums and
mailing lists. 

>From what I hear, the LP-PAN should be second to no other pan adapter and
the ability to use it as a 2nd receiver is very attractive, too. I am quite
excited at the prospect of adding a DRM decoder behind it (BC DRM - not the
narrow band ham version), although there are ruminations that DRM is a dud
in the marketplace and may disappear.

Knut - AB2TC


Tom Childers, N5GE wrote:
> 
> On Mon, 19 May 2008 10:37:38 -0500, you wrote:
> 
> [snip]
> 
>>Count me in on a stand alone spectrum display, a small black box with  
>>a VGA connector.  I don't want to be tethered to a computer though.  I  
>>agree on the SM230/220, had them both and neither on holds a candle to  
>>the Icom bandscope, for receiving
>>
>>Dale, K9VUJ
> 
> Yes, I'd rather have a stand alone also, but not at the price of over 1k
> buck!
> 
> 
> 
> 

-- 
View this message in context: 
http://www.nabble.com/Interesting-Stuff-At-Dayton-tp17308788p17322273.html
Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] Interesting Stuff at Dayton

[Mark Bayern]

> Au contrare - K3's IF output is shown on the schematics to clearly be
> taken before the crystal filters.

Maybe I should have said, 'bandpass filters'? I checked before I wrote
the message and knew that the IF pickup is before the roofing filters.

...sorry for any confusion

Mark  AD5SS



On Mon, May 19, 2008 at 8:18 AM, Barry N1EU <[EMAIL PROTECTED]> wrote:
> AD5SS penned "it is a 2nd receiver for any signal that is available to
> it from the K3's IF. That means only signals that make it through the
> passband filter."
>
> Au contrare - K3's IF output is shown on the schematics to clearly be
> taken before the crystal filters.
>
> 73,
> Barry N1EU
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[Elecraft] OT - Kenwood 'scopes

[Ken Kopp]

Good or not, they were / are very popular.  I've sold four
of 'em on eBay ... "spirited" bidding.  All went off-shore.

73! Ken Kopp - K0PP
  [EMAIL PROTECTED]
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Re: [Elecraft] a real bandscope

[Tom Childers, N5GE]

On Mon, 19 May 2008 10:37:38 -0500, you wrote:

[snip]

>Count me in on a stand alone spectrum display, a small black box with  
>a VGA connector.  I don't want to be tethered to a computer though.  I  
>agree on the SM230/220, had them both and neither on holds a candle to  
>the Icom bandscope, for receiving
>
>Dale, K9VUJ

Yes, I'd rather have a stand alone also, but not at the price of over 1k buck!

The KWD SM-230 was a good scope in it's day but it is 30 year old technology.  I
have one and still use it for the other things it does.

Tom, N5GE - SWOT 3537 - Grid EM12jq

"Those who would give up 
Essential Liberty to 
purchase a little Temporary 
Safety deserve neither 
Liberty nor Safety" 

An excerpt from a letter 
written in 1755 from the 
Assembly to the Governor 
of Pennsylvania.

Support the entire Constitution, not 
just the parts you like.

http://www.n5ge.com
http://www.eQSL.cc/Member.cfm?N5GE

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Re: [Elecraft] Elecraft at Dayton

[Vic K2VCO]

Doug Faunt N6TQS +1-510-655-8604 wrote:


Note that the KPA800/1500 was first shown with the K2, and was closely
integrated at that time.  


It would work well with the K2, but it was designed to work with other 
popular rigs from ICOM, Yaesu, Kenwood, etc. as well. It is not 'closely 
integrated' in the way that the KPA100 is!



Rumor:  I've heard that the amp worked really well mostly, but there was a
problem that caused much failure of the expensive power devices.


I asked Eric specifically why the amplifiers were delayed. Did they meet 
IMD goals? He said that there was only one reason: the K3.


--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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Re: [Elecraft] a real bandscope

[dalej]

On 19, May 2008, at 10:10, Vic K2VCO wrote:


Charles Harpole wrote:

If u would like a real bandscope with a completely real time
oscilloscope-like trace (as well as a xmas tree), get the SM-220 or
SM-230 from Kenwood.  Probably no longer made, they mate with the
TS-950 and its juniors and really work even when u are turning the
tuning knob.  Likely Kenwood lovers will not part with theirs, so gud
luck on finding one.  No computer needed at all.   This OLD
TECHNOLOGY remains superior to anything I've seen in the new market
today.  Too bad it must mate with such a medium-performing rcvr.


I have to disagree. I had one, and the bandwidth of the filter used  
is so wide that it's impossible to distinguish cw signals a few kHz  
apart. It definitely does not provide the kind of display found, for  
example, on newer ICOM rigs.


I too would like a standalone panadapter (bandscope, whatever) that  
does not require a computer, but I don't miss the Kenwood unit.


--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco




Count me in on a stand alone spectrum display, a small black box with  
a VGA connector.  I don't want to be tethered to a computer though.  I  
agree on the SM230/220, had them both and neither on holds a candle to  
the Icom bandscope, for receiving


Dale, K9VUJ
 
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Re: [Elecraft] Elecraft at Dayton

[Doug Faunt N6TQS +1-510-655-8604]

   Date: Mon, 19 May 2008 08:13:09 -0700 (PDT)
   From: Chris Kantarjiev K6DBG <[EMAIL PROTECTED]>



   > You can always drive a linear amp with a QRP signal, but under FCC
   > rules, producing more than 480 watts out with 15W in is prohibited for
   > a type-accepted amplifier (15 db gain).

   Of course! Too much blood in my caffeine stream. But if there were, say, a
   convenient attenuator pad that could be bypassed by a motivated amateur...

IIRC, "easily modified" was in the older rules, but that seems to only
apply to CB coverage now.  

   > err, why not just build up another KPA-100 and leave it with the
   > KPA800?

   No reason, really, aside from cost (which might pale in comparison to the
   KPA800!)

Yep.   I suspect the KPA100 is really necessary, though, since it's got
filtering approriate for that level of output power and I think there
might be a problem with just amplifying the QRP level signal to real
QRO, without adding the extra filtering.  I suspect other know the
details on this better than I.

   Mostly, I guess, I hope that any such amp will be as well integrated with
   the K2 as the K3.

Note that the KPA800/1500 was first shown with the K2, and was closely
integrated at that time.  

Rumor:  I've heard that the amp worked really well mostly, but there was a
problem that caused much failure of the expensive power devices.

73, doug
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Re: [Elecraft] a real bandscope

[n4lq]

I must agree Vic. That Kenwood SM-2xx is a total joke. There is no way to 
use it for finding signals. How one could consider it superior is beyond me. 
And yes...I had one...worthless.

Steve Ellington
[EMAIL PROTECTED]
- Original Message - 
From: "Vic K2VCO" <[EMAIL PROTECTED]>

To: "Elecraft Reflector" 
Sent: Monday, May 19, 2008 11:10 AM
Subject: Re: [Elecraft] a real bandscope



Charles Harpole wrote:

If u would like a real bandscope with a completely real time
oscilloscope-like trace (as well as a xmas tree), get the SM-220 or
SM-230 from Kenwood.  Probably no longer made, they mate with the
TS-950 and its juniors and really work even when u are turning the
tuning knob.  Likely Kenwood lovers will not part with theirs, so gud
luck on finding one.  No computer needed at all.   This OLD
TECHNOLOGY remains superior to anything I've seen in the new market
today.  Too bad it must mate with such a medium-performing rcvr.


I have to disagree. I had one, and the bandwidth of the filter used is
so wide that it's impossible to distinguish cw signals a few kHz apart.
It definitely does not provide the kind of display found, for example,
on newer ICOM rigs.

I too would like a standalone panadapter (bandscope, whatever) that does
not require a computer, but I don't miss the Kenwood unit.

--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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No virus found in this incoming message.
Checked by AVG.
Version: 8.0.100 / Virus Database: 269.23.21/1454 - Release Date: 5/19/2008 
7:44 AM


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Re: [Elecraft] Elecraft at Dayton

[Chris Kantarjiev K6DBG]

> You can always drive a linear amp with a QRP signal, but under FCC
> rules, producing more than 480 watts out with 15W in is prohibited for
> a type-accepted amplifier (15 db gain).

Of course! Too much blood in my caffeine stream. But if there were, say, a
convenient attenuator pad that could be bypassed by a motivated amateur...

> err, why not just build up another KPA-100 and leave it with the
> KPA800?

No reason, really, aside from cost (which might pale in comparison to the
KPA800!)

Mostly, I guess, I hope that any such amp will be as well integrated with
the K2 as the K3.

73 de chris K6DBG
-- 
View this message in context: 
http://www.nabble.com/K3---New-firmware-tp17307418p17317662.html
Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] a real bandscope

[Vic K2VCO]

Charles Harpole wrote:

If u would like a real bandscope with a completely real time
oscilloscope-like trace (as well as a xmas tree), get the SM-220 or
SM-230 from Kenwood.  Probably no longer made, they mate with the
TS-950 and its juniors and really work even when u are turning the
tuning knob.  Likely Kenwood lovers will not part with theirs, so gud
luck on finding one.  No computer needed at all.   This OLD
TECHNOLOGY remains superior to anything I've seen in the new market
today.  Too bad it must mate with such a medium-performing rcvr. 


I have to disagree. I had one, and the bandwidth of the filter used is 
so wide that it's impossible to distinguish cw signals a few kHz apart. 
It definitely does not provide the kind of display found, for example, 
on newer ICOM rigs.


I too would like a standalone panadapter (bandscope, whatever) that does 
not require a computer, but I don't miss the Kenwood unit.


--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Elecraft] K3-Wiki

[Mike Scott]

I would think it appropriate for this community to upload the K3 manuals
into some Wiki and edit them as a group, always keeping it current.

It would be better if there was a way to preserve formatting with photos
etc, so that all one would need to do is print it to have an up to date
manual. I don't know if a Wiki can do this.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1  #1311



Date: Sun, 18 May 2008 13:23:53 -0700 (PDT)
From: Don Rasmussen <[EMAIL PROTECTED]>
Subject: [Elecraft] K3 - New firmware
To: "elecraft@mailman.qth.net" 
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=iso-8859-1

Since the original K3 manual was printed, many
important new setups have been added to the K3
firmware that are shown and described in separate
documents.

There is now a wiki page that contains the cumulative
options to date. Each setup option can be expanded on
by users of the K3 reflector. Have a comment to make,
or a helpful suggestion about any specific K3 CONFIG
setting?

Click on the word EDIT above the setting you can help
with, then key in your callsign and your info. 

For example, I added a comment about the AGC-F config
setting, see
http://www.zerobeat.net/mediawiki/index.php/Firmware_-_revision_1.96_documen
ted#AGC-F

Here is the main page:

http://www.zerobeat.net/mediawiki/index.php/Firmware_-_revision_1.96_documen
ted

The page is open for user edit at this time, please
give it a look, add some expertise if you have
experience with any setup and the specific results of
changing the values.

t u ..

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[Elecraft] WA3WSJ's PA AT QRP Hike

[Edward R. Breneiser]

I've been trying to hike my next PA AT Section, but the weather has been
wet and damp here. Looks like Thursday through Sunday will be nice
weather here in Pennsylvania so I'm planning my next hike. I only have
four more Appalachian Trail Hikes left to do and then I'll finish off
PA! So listen for Kangaroo Ed, WA3WSJ hiking the AT and playing QRP. If
the contest has 40m (7.030) and 20m (14.060) all tied up, look for
WA3WSJ on 30m around 10.116 mhz +- qrm.  I'll be using my Pimped Out KX1
and my Black Widow Vertical without a pole on the AT. Hope to hear many
familiar calls while I'm out on the AT.

Date:  5/22 - 5/25
Time:  mornings ~ 8am-9am  & evenings  7pm-9pm
Call:  WA3WSJ
QTH:   PA  AT near Carlisle, PA
Bands: 14.060, 7.030 10.116mhz

p.s. 
I'll be sending out my special "Kangaroo Ed" AT QSL Card to all who work
me. Look at it on the link below.

http://wa3wsj.homestead.com/index.html



"Life is Short So Enjoy"

72,
Kangaroo Ed, WA3WSJ

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Re: [Elecraft] K3 - Setup After Firmware Upgrade

[Lyle Johnson]

What setup is required after firmware upgrade? Say 1.88 to 1.96b.


In general, check the release notes to see what's been changed. 
Controls or settings related to those functions might need to be 
altered, and in any event should be verified.


In this case, MIC GAIN and VOX GAIN are probably going to be different 
than what you were using before.


73,

Lyle KK7P

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Re: [Elecraft] RTTY filter for K3

[Lyle Johnson]

Using a excessively narrow filter on RTTY is a balancing act. 

If the bandwidth is too narrow the tones tend to become "smeared" 
- the transitions become less easy to detect (in other words, 
the "eye" begins to close).  However, narrowing the bandwidth 
also reduces the amount of QRM/QRN making it through the filter 
and to the decoder/detector.


How about using a Nyquist filter?

A Nyquist filter is one that results in no inter-symbol interference. 


One of the difficulties with RTTY is that the tone spacings are so wide. 
 For a 45 baud FSK signal, a shift of about 30 Hz would minimize the 
occupied bandwidth and have no intersymbol interference.  But standard 
practice is to use 170 Hz or 200 Hz shift. [ 200 Hz Shift is about right 
for 300 baud FSK, which is what we used (and why we used it) for HF 
packet some 25 years ago.  And optimized it for common 400 Hz to 500 Hz 
 wide "CW" crystal filters of that era. ]


Thus, the rise of the dual tone filter (K3) and its work-alikes in 
various radios and demodulators, with fairly tight filters around each 
tone to pass it along with its significant sidebands.  But the overall 
IF passband still needs to be wide enough to pass both tones and their 
sidebands. I imagine you can observe all of this on your "P1".


Some RTTY decoders take advantage of the tone separation and actually 
employ a pair of detectors, one for each tone, and use the outputs 
differentially to get some protection from selective fading.  170 Hz 
spacing is probably too close for such protection -- 850 Hz spacing 
would be better, but that requires an even wider IF passband...


Some soundcard-based RTTY programs support really narrow shifts, but 
such signals are not often heard at this QTH.  Maybe it is because 
everyone is listening and no one is calling CQ?


Enjoy!

Lyle KK7P

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[Elecraft] K3 - Setup After Firmware Upgrade

[Joe Word]

What setup is required after firmware upgrade? Say 1.88 to 1.96b.

Should we do the Low and High TX Gain Calibration?

What else?


Joe  N9VX

K3  #841
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[Elecraft] Interesting Stuff at Dayton

[Barry N1EU]

AD5SS penned "it is a 2nd receiver for any signal that is available to
it from the K3's IF. That means only signals that make it through the
passband filter."

Au contrare - K3's IF output is shown on the schematics to clearly be
taken before the crystal filters.

73,
Barry N1EU
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Re: [Elecraft] a real bandscope

[Simon Brown (HB9DRV)]

After experiencing a few RTTY QSO's over the weekend (yes - I was on RTTY) I 
think I'm in need of the 1500 watt beauty as a matter of extreme urgency!


I saw it in the flesh in 2005 and have been drooling over the keyboards ever 
since.


Simon Brown, HB9DRV

--
From: "AD6XY - Mike" <[EMAIL PROTECTED]>

Unfortunately I forgot to ask about the prospects for a
linear amplifier once the K3 project settles down.



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Re: [Elecraft] a real bandscope

[AD6XY - Mike]

A really really good bandscope can be had through using the SDR-IQ from
RFSpace connected to the IF output of the K3. It can also record 180kHz
worth of the band. Non-computer based methods are also possible, but the
computer realisation is so much more versatile. The SDR-IQ software can
interface directly to the K3 RS232, so you can point and click when
something interesting appears on the bandscope and centre it in the K3 IF.
Ah yes, and this is a bandscope that can demodulate too, all modes.

Regarding Dayton and the Elecraft stand

It was nice to see everyone there. There was quite a crush around Wayne and
Eric whenever I passed by. They looked like they were enjoying themselves
too. It was good to see the second rx working and the nice features of the
firmware associated with it. I found out several interesting things about
their future plans too, including the plans for a keyboard and variable
bandwidth filters. Unfortunately I forgot to ask about the prospects for a
linear amplifier once the K3 project settles down.

Mike 
-- 
View this message in context: 
http://www.nabble.com/Interesting-Stuff-At-Dayton-tp17308788p17316665.html
Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] Interesting Stuff At Dayton

[Mark Bayern]

>>"Additionally, it really constitutes a 2nd receiver, which l sorts of 
>>possibilities.

... well ... it is a 2nd receiver for any signal that is available to
it from the K3's IF. That means only signals that make it through the
passband filter.

Mark   AD5SS





On Sun, May 18, 2008 at 5:56 PM,  <[EMAIL PROTECTED]> wrote:
> Hi All,
>
> Something that I saw at Dayton may be of interest to Elecraft 
> owners--particularly K3, and possibly K2 folks.  Jay Bromley and I visited 
> with Larry Phipps at his booth for a while.  Larry has several very 
> innovative items that he sells, including probably the most unique 
> wattmeter/SWR meter you can find anywhere (the LP-100A).  What caught our 
> attention was Larry's new panadapter for the K3.  He's contemplating doing 
> one for the K2 as well.  Anyway, this new gadget (I hope I don't offend Larry 
> by calling it a gadget) is very impressive.  You should really go to his 
> website to get the full details, but believe me, it is really a slick piece 
> of engineering.  I'm not fully familiar with the Icom bandscope on it's 
> higher end rigs, but I think this product from Larry will rival or exceed 
> what you find there. opens up al Additionally, it really constitutes a 2nd 
> receiver, which l sorts of possibilities.  For example, maybe if you get this 
> accessory you really don't get enough more with the Elecraft 2nd RX  
> Can't really say that for sure, but it's pretty clear that Larry has 
> something that might give one pause as to whether or not they need something 
> over and above that.  Anyway, the demo Larry gave us was most impressive.  I 
> suggest you keep one eye on his website for more details.  In any event, the 
> panadapter is fairly reasonable, and is available in either kit form or fully 
> assembled.  Larry says building it is not very difficult or time consuming.  
> By all means, check all of this out.
>
> Dave W7AQK
>
>
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RE: [Elecraft] Interesting Stuff At Dayton

[Mike Short]

What I am in the process of doing is putting together the Softrock receiver,
and lashing it up to a micro ITX formfactor
PC. They are very small, and have the ability to use a 12V DC power input.
Do a search on car computers, and there is a ton of stuff there.
Mate it with an old LCD monitor that is small, or they make 6-8 inch
monitors that are expensive. With this arrangement, the scope would be about
the
Size of any other kind of scope, and could still be used as a shack PC for
rig control, logging, etc. 

Mike
AI4NS 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of G4ILO
Sent: Monday, May 19, 2008 3:40 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Interesting Stuff At Dayton



David Yarnes wrote:
> 
> Hi All,
> 
> Something that I saw at Dayton may be of interest to Elecraft
> owners--particularly K3, and possibly K2 folks.  Jay Bromley and I visited
> with Larry Phipps at his booth for a while.  Larry has several very
> innovative items that he sells, including probably the most unique
> wattmeter/SWR meter you can find anywhere (the LP-100A).  What caught our
> attention was Larry's new panadapter for the K3.  He's contemplating doing
> one for the K2 as well.  Anyway, this new gadget (I hope I don't offend
> Larry by calling it a gadget) is very impressive.  You should really go to
> his website to get the full details, but believe me, it is really a slick
> piece of engineering.  I'm not fully familiar with the Icom bandscope on
> it's higher end rigs, but I think this product from Larry will rival or
> exceed what you find there.  Additionally, it really constitutes a 2nd
> receiver, which opens up all sorts of possibilities.  For example, maybe
> if you get this accessory you really don't get enough more with the
> Elecraft 2nd RX  Can't really say that for sure, but it's pretty clear
> that Larry has something that might give one pause as to whether or not
> they need something over and above that.  Anyway, the demo Larry gave us
> was most impressive.  I suggest you keep one eye on his website for more
> details.  In any event, the panadapter is fairly reasonable, and is
> available in either kit form or fully assembled.  Larry says building it
> is not very difficult or time consuming.  By all means, check all of this
> out.  
> 
> 
It appears to me that it would be a second receiver only with the aid of a
PC, sound card and SDR software.

What I would like to see is an external bandscope that does not require a
computer. Either it would be completely self contained, or it would use an
inexpensive portable LCD TV for its display. Perhaps Elecraft will come up
with something like this in the future? 

-
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
-- 
View this message in context:
http://www.nabble.com/Interesting-Stuff-At-Dayton-tp17308788p17313629.html
Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] KX-1 20 Meter Deafness

[Kurt Pawlikowski]

Mike,

   While my pride as a builder says, "No way!" you are probably right 
and I'll probably have to rebuild that board. To paraphrase a quote: "We 
hates it Mr. Baggins..."


   Regards,

   kurtt

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

Mike wrote:

Kurt,

For what it's worth, when I built my KX-1 I had very similar problems.  I wound 
up sending a pic of my LPF board to Don, who spotted the slightest hint of 
enamel insulation in one of the toroid solder joints.  I had to look at it 4 
times before I could even see it.  Anyway, I wound up pretty much rebuilding 
that board and it was fine after that.  It's *very* finicky.

--
73,
Mike, KC0KBC

 -- Original message --
From: Kurt Pawlikowski <[EMAIL PROTECTED]>
  

Don,

I'll check the LPF board closely.

As far as whether the signal increase, I believe it does. Since, 
when I touch it, signals I an hearing on my other receiver become 
apparent in the KX-1 also. And, I believe the XG-2 signal is increasing 
(only by ear). I say that because the increase is very noticeable: From, 
"Is it there?" to "I have to turn it down." Which is quite a jump 
(probably 9dB).


Anyway, I'll look it over more closely (maybe rebuild that board) 
and report back. Thanks.


Regards,

kurtt

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

Don Wilhelm wrote:


Kurt,

From all you have said, I would believe that the problem is in the 
KXB3080 low pass filter.
While I agree that your continuity test indicates no apparent problem 
with the toroid lead tinning, check all the connections to be certain 
there is a bit of solder on both sides of the board - if not, view 
that connection with suspicion.


Make certain there is no contact with the green wire from L2 to the 
lower connection of the red wire.  The green wire must wrap around to 
the back side of the LPF board and can inadvertently contact the #4 
termination of the wire for the red winding.


The best LPF testing is visual - look for any suspicious solder 
connections.  Yes, you will see a 17 MHz cutoff on the LPF if you 
measure it without regard to disconnecting it from the rest of the 
circuit and failing to properly terminate the filter (it is not 50 
ohms at the PA transistor side, but I have not ever calculated the 
proper termination).


Perhaps it is helpful if I tell you that the green winding is the only 
active portion on 40, 30 and 20 meters.  The red winding is used for 
80 meters and SWB band below about 6 MHz only.


Caution:  The sensitivity of the KX1 is not as great on 20 meters as 
it is on 30 or 40 meters.  Bringing a finger (or antenna) close to T2 
or many of the receiver tuned circuits after the LPF  will normally 
result in an increase in receiver total output, but that is actually 
an increase in broadband noise - under careful measurement conditions, 
the desired signal strength will not increase even though the overall 
noise level does.  Spectrogram will show that is true.


73,
Don W3FPR

Kurt Pawlikowski wrote:
  

Hi,

   First, thanks for reading. Hopefully, it won't be boring for those
lucky K3 guys and gals...

   CONFIGURATION

   KX-1, 3080 upgrade. ATU currently removed and antenna jumper
installed for testing.Using XG-2 as a signal source. I have confirmed
the XG-2 seems to be working about as expected with another receiver
(about S-10 at 50uv and S-0 (but still in the speakers) at 1uv).

   SYMPTOM

   With normal operation, receive levels appear normal on 80 and 40 (I
can make contacts), but the XG2 is not peaking the KX-1's meter (I used
the XG-2 to calibrate the meter). 20 meters has always seemed deaf to
me. I don't remember how well the XG-2 was received on 20 when I
calibrated it. Here's the real "kicker": On 20 meters, with the XG-2
attached, I hear *no* volume difference between 50 and 1uv (which means
the KX-1's receiver is picking up the signal by proximity, not through
the antenna connection). If I touch the RX antenna connection almost
anywhere between the low-pass filter and the input of the Rx Mixer (U6,
pin 1), 20 meters comes way up (from nothing to receiving moderately
weak signals and noise). Touching the RX antenna line on 80 and 40
appears to have little or no affect. Output power on 20 meters does not
register full power, but I'm not sure if this is a calibration problem
as I don't have an accurate power meter. Also, when I couple a grid dip
meter into the RX, when tuned to 30 or 20 meters, I get a marked "dip"
just at about 17 MHz.



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Elecraft

[Elecraft] a real bandscope

[Charles Harpole]

If u would like a real bandscope with a completely real time oscilloscope-like 
trace (as well as a xmas tree), get the SM-220 or SM-230 from Kenwood.  
Probably no longer made, they mate with the TS-950 and its juniors and really 
work even when u are turning the tuning knob.  Likely Kenwood lovers
will not part with theirs, so gud luck on finding one.  No computer needed at 
all.   This OLD TECHNOLOGY remains superior to anything I've seen in the new 
market today.  Too bad it must mate with such a medium-performing rcvr.  73


Charles Harpole
[EMAIL PROTECTED]

> Date: Mon, 19 May 2008 01:39:57 -0700
> From: [EMAIL PROTECTED]
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Interesting Stuff At Dayton
>
>
>
> David Yarnes wrote:
>>
>> Hi All,
>>
>> Something that I saw at Dayton may be of interest to Elecraft
>> owners--particularly K3, and possibly K2 folks. Jay Bromley and I visited
>> with Larry Phipps at his booth for a while. Larry has several very
>> innovative items that he sells, including probably the most unique
>> wattmeter/SWR meter you can find anywhere (the LP-100A). What caught our
>> attention was Larry's new panadapter for the K3. He's contemplating doing
>> one for the K2 as well. Anyway, this new gadget (I hope I don't offend
>> Larry by calling it a gadget) is very impressive. You should really go to
>> his website to get the full details, but believe me, it is really a slick
>> piece of engineering. I'm not fully familiar with the Icom bandscope on
>> it's higher end rigs, but I think this product from Larry will rival or
>> exceed what you find there. Additionally, it really constitutes a 2nd
>> receiver, which opens up all sorts of possibilities. For example, maybe
>> if you get this accessory you really don't get enough more with the
>> Elecraft 2nd RX Can't really say that for sure, but it's pretty clear
>> that Larry has something that might give one pause as to whether or not
>> they need something over and above that. Anyway, the demo Larry gave us
>> was most impressive. I suggest you keep one eye on his website for more
>> details. In any event, the panadapter is fairly reasonable, and is
>> available in either kit form or fully assembled. Larry says building it
>> is not very difficult or time consuming. By all means, check all of this
>> out.
>>
>>
> It appears to me that it would be a second receiver only with the aid of a
> PC, sound card and SDR software.
>
> What I would like to see is an external bandscope that does not require a
> computer. Either it would be completely self contained, or it would use an
> inexpensive portable LCD TV for its display. Perhaps Elecraft will come up
> with something like this in the future?
>
> -
> Julian, G4ILO K3 s/n: 222 K2 s/n: 392
> G4ILO's Shack: www.g4ilo.com
> Zerobeat Ham Forums: www.zerobeat.net/smf
> --
> View this message in context: 
> http://www.nabble.com/Interesting-Stuff-At-Dayton-tp17308788p17313629.html
> Sent from the Elecraft mailing list archive at Nabble.com.
>
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Re: [Elecraft] Help with cheap headset and K2

[Dr. Werner Furlan]

hi Bill, 

I have tried a Plantronics Computer Headset in the past with my K2.
I made an adapter like you did but with the internal 5V bias. 
Audio reports were worse than with the dynamic Kenwood microphone I 
used before. 
I tried this special microphone because G4ILO recommended it on his 
homepage. (http://www.g4ilo.com/k2_headset.html). I had hoped that I could 
make better use of the VOX in the K2, but it was not good enough for my 
low voice.
In the meantime I connected it to the K3 and listened to myself and now I 
know why the reports were bad. The frequency response of the microphone 
is not good for this purpose.
In the K3 I could compensate it with the equalizer, but together with the K2 
you are probably lost. 
Now I am waiting for the Sennheiser PC 150 now, maybe this is better.
My usual headset is the Heil Proset with HC5 element. The reason why I am 
looking for an alternative is the weight of the Heil headset and the earpads 
make a pressure on the arms of my glasses and this hurts after some time.

73! de Werner
OE9FWV



On 18 May 2008 at 16:06, nz0t wrote:

> 
> Just for grins I bought a cheap Cyber Acoustics computer headset to
> use with my K3 when it arrives.  Others have said they got good
> reports with their K3 and this headset which uses an electret mic and
> a 3.5MM stereo mini plug. Not wanting to cut off the plug which fits
> into the back of the K3 I made up an adapter for my K2 using an inline
> stereo jack, an 8 pin mike plug and a 9 volt battery through a 5K
> resistor to power the mic.  My K2 is wired for the Kenwood mics and I
> don't want to power the mic from the rig.  I wired the grounds to the
> base of the plug, 9V DC through the 5K resistor to the middle and the
> mic positive to the tip.  It works but my reports with the K2 have not
> been very good.  I also made up an adapter for my Drake TR7 and
> reports on that rig are fine. Am I doing something wrong with the K2? 
> I know little about electret mics and maybe I am using too much
> voltage or the wrong resistor.  Any help would be greatly appreciated.
> If I can't get it to work the headset was only about $15 shipped so no
> big deal.
> 


--  
Genetic Engineering Splits Scientists



PGP-Key: 
Fone +43 5522 75013
Fax +43 820 555 85 2621
Mobile  +43 664 6340014


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Re: [Elecraft] Interesting Stuff At Dayton

[G4ILO]

David Yarnes wrote:
> 
> Hi All,
> 
> Something that I saw at Dayton may be of interest to Elecraft
> owners--particularly K3, and possibly K2 folks.  Jay Bromley and I visited
> with Larry Phipps at his booth for a while.  Larry has several very
> innovative items that he sells, including probably the most unique
> wattmeter/SWR meter you can find anywhere (the LP-100A).  What caught our
> attention was Larry's new panadapter for the K3.  He's contemplating doing
> one for the K2 as well.  Anyway, this new gadget (I hope I don't offend
> Larry by calling it a gadget) is very impressive.  You should really go to
> his website to get the full details, but believe me, it is really a slick
> piece of engineering.  I'm not fully familiar with the Icom bandscope on
> it's higher end rigs, but I think this product from Larry will rival or
> exceed what you find there.  Additionally, it really constitutes a 2nd
> receiver, which opens up all sorts of possibilities.  For example, maybe
> if you get this accessory you really don't get enough more with the
> Elecraft 2nd RX  Can't really say that for sure, but it's pretty clear
> that Larry has something that might give one pause as to whether or not
> they need something over and above that.  Anyway, the demo Larry gave us
> was most impressive.  I suggest you keep one eye on his website for more
> details.  In any event, the panadapter is fairly reasonable, and is
> available in either kit form or fully assembled.  Larry says building it
> is not very difficult or time consuming.  By all means, check all of this
> out.  
> 
> 
It appears to me that it would be a second receiver only with the aid of a
PC, sound card and SDR software.

What I would like to see is an external bandscope that does not require a
computer. Either it would be completely self contained, or it would use an
inexpensive portable LCD TV for its display. Perhaps Elecraft will come up
with something like this in the future? 

-
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
-- 
View this message in context: 
http://www.nabble.com/Interesting-Stuff-At-Dayton-tp17308788p17313629.html
Sent from the Elecraft mailing list archive at Nabble.com.

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