Re: [Elecraft] K3 DATA A vs AFSK A

[David Cole]

LSMFT had several other meanings...  :)
-- 
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
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for Dopplergram information see:
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for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info


On Tue, 2015-03-17 at 17:47 -0700, Lynn W. Taylor, WB6UUT wrote:
> ... and it should be LSB because everyone knows: Low Space Means Fine 
> Teletype.
> 
> On 3/17/2015 4:00 PM, Joe Subich, W4TV wrote:
> >
> > Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
> > (LSB) reverses the sense of the tones - Mark is the lower of the two
> > audio tones but the higher of the RF frequencies.
> >
> > 73,
> >
> >... Joe, W4TV
> >
> >
> > On 2015-03-17 6:48 PM, Fred Jensen wrote:
> >> Hmmm ... this may be the first time Fred Cady's book has failed me.  I
> >> understand now "what" each mode does.  What's still not clear is "why
> >> would I choose one over the other?"  Operator/User manuals tend not to
> >> answer that question, they are understandably focused on exactly how to
> >> operate the equipment.
> >>
> >> I'm very sure that, when I first set up RTTY, I went to AFSK A because I
> >> knew what audio frequency shift keying was and I didn't know what DATA A
> >> was.  It all worked, so I never changed it or tried out the other
> >> choice.  I guess if AFSK A is LSB and works with MMTTY in its default
> >> configuration, then DATA A is USB and I'd have to reverse the tones in
> >> MMTTY.
> >>
> >> I'll leave it as I've been using it, it works so it obviously doesn't
> >> need fixing.  I was just curious.  I have my "pitch" set at 915 Hz, I
> >> can't hear 2,125 Hz.  Thanks Joe and Mike.
> >>
> >> 73,
> >>
> >> Fred K6DGW
> >> - Northern California Contest Club
> >> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> >> - www.cqp.org
> >>
> >> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:
> >>>
> >>> On 2015-03-17 12:41 PM, Fred Jensen wrote:
> >>>  > Can you 'splain the difference between AFSK and DATA A?
> >>>
> >>> AFSK A and DATA A are both audio modes.  AFSK A uses LSB
> >>> and FC is set to MARK - 85 Hz (the center of the two RTTY
> >>> Tones).  DATA A is USB and FC is set to 1500 Hz (the center
> >>> of the transmit audio passband [200 - 2800 Hz]).
> >>>
> >>> AFSK A also allows use of the AFSK transmit filter (a tight
> >>> filter around the Mark/Space tones to eliminate hum/pops/etc.)
> >>> and the use of the Dual Tone filter on receive.
> >>
> >> __
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> >> Message delivered to li...@subich.com
> >>
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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[Harry Yingst via Elecraft]

Look on Page 11 of the KPA500 Manual


  From: mike 
 To: elecraft@mailman.qth.net 
 Sent: Tuesday, March 17, 2015 4:10 PM
 Subject: Re: [Elecraft] KPA500 suddenly low output - only 30 watts
   
Nope, not a Null Modem, just a gender changer with the #10 pin clipped (upon
closer inspection.) And I had written on it KL INT or maybe INT KL for which
I have no idea as to the meaning. But no worries it all works great now. ;>) 
73  ..mike  AI6II



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Re: [Elecraft] HP 8921 problems

[Phil Wheeler]

Try Google and look for a service manual on line. 
I've had good luck that way with other such items.


Phil W7OX

On 3/17/15 2:00 PM, Niel Skousen wrote:

Good Afternoon All,

I have an HP 8921 Service monitor, and when I powered it up today, it worked 
for about 5 min...  then the power supply started to sag, the display crashed, 
and I powered down.

Any one have any experience with HP8921 service ?Seems like the power 
supply overloaded, and I can smell the smoke  8-(   but I cant see anything 
obvious inside (eg puff'ed up / split electrolytic cap's in the power supply 
etc)  Its been off for several months after a move.

Anybody with idea's or suggestions, please drop me a note off line

TIA

Niel
WA7SSA
nskousen (at) talisman-intl.com
nskousen (at) ecsecurityinc.com


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Re: [Elecraft] K3 DATA A vs AFSK A

[Lynn W. Taylor, WB6UUT]

... and it should be LSB because everyone knows: Low Space Means Fine 
Teletype.


On 3/17/2015 4:00 PM, Joe Subich, W4TV wrote:


Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
(LSB) reverses the sense of the tones - Mark is the lower of the two
audio tones but the higher of the RF frequencies.

73,

   ... Joe, W4TV


On 2015-03-17 6:48 PM, Fred Jensen wrote:

Hmmm ... this may be the first time Fred Cady's book has failed me.  I
understand now "what" each mode does.  What's still not clear is "why
would I choose one over the other?"  Operator/User manuals tend not to
answer that question, they are understandably focused on exactly how to
operate the equipment.

I'm very sure that, when I first set up RTTY, I went to AFSK A because I
knew what audio frequency shift keying was and I didn't know what DATA A
was.  It all worked, so I never changed it or tried out the other
choice.  I guess if AFSK A is LSB and works with MMTTY in its default
configuration, then DATA A is USB and I'd have to reverse the tones in
MMTTY.

I'll leave it as I've been using it, it works so it obviously doesn't
need fixing.  I was just curious.  I have my "pitch" set at 915 Hz, I
can't hear 2,125 Hz.  Thanks Joe and Mike.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:


On 2015-03-17 12:41 PM, Fred Jensen wrote:
 > Can you 'splain the difference between AFSK and DATA A?

AFSK A and DATA A are both audio modes.  AFSK A uses LSB
and FC is set to MARK - 85 Hz (the center of the two RTTY
Tones).  DATA A is USB and FC is set to 1500 Hz (the center
of the transmit audio passband [200 - 2800 Hz]).

AFSK A also allows use of the AFSK transmit filter (a tight
filter around the Mark/Space tones to eliminate hum/pops/etc.)
and the use of the Dual Tone filter on receive.


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Re: [Elecraft] K3 DATA A vs AFSK A

[Don Wilhelm]

Which data sub-mode is used is really a user's choice and is dependent 
on what data mode software is intended to be used.  Some waterfall 
display oriented data mode software will do fine sending and decoding 
RTTY as well as other data modes.  MMTTY (which is the main choice for 
RTTY operation) does not do a waterfall and you tune to the signal 
desired with the VFO.  A similar situation is true for PSK D and FSK D - 
you tune to the desired station with the VFO rather than clicking on a 
waterfall display.


For those who are not clear about the data sub-mode designations try this:
DATA A = Data mode (Audio) = waterfall display oriented (point and click)
AFSK A = AFSK mode (Audio) = Tune in a single station with the VFO
PSK D = PSK mode (Digital) = send CW with paddles (or ASCII in KY 
command), receive on K2 display or K3 Utility terminal
FSK D = FSK mode (Digital) = send CW with paddles (or ASCII in KY 
command or 'wiggling the FSK IN pin on the ACC jack), receive on K2 
display or K3 Utility terminal


Hopefully that helps with understanding of what the "A" and "D" suffixes 
mean.


In summary, if you are using an application that has a waterfall 
display, use DATA A and point and click on the waterfall to select the 
station.
How you use the data sub-modes depends on which software application you 
are using as well as the physical connections to the K3.


73,
Don W3FPR

On 3/17/2015 6:48 PM, Fred Jensen wrote:
Hmmm ... this may be the first time Fred Cady's book has failed me.  I 
understand now "what" each mode does.  What's still not clear is "why 
would I choose one over the other?"  Operator/User manuals tend not to 
answer that question, they are understandably focused on exactly how 
to operate the equipment.


I'm very sure that, when I first set up RTTY, I went to AFSK A because 
I knew what audio frequency shift keying was and I didn't know what 
DATA A was.  It all worked, so I never changed it or tried out the 
other choice.  I guess if AFSK A is LSB and works with MMTTY in its 
default configuration, then DATA A is USB and I'd have to reverse the 
tones in MMTTY.


I'll leave it as I've been using it, it works so it obviously doesn't 
need fixing.  I was just curious.  I have my "pitch" set at 915 Hz, I 
can't hear 2,125 Hz.  Thanks Joe and Mike.


73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:


On 2015-03-17 12:41 PM, Fred Jensen wrote:
 > Can you 'splain the difference between AFSK and DATA A?

AFSK A and DATA A are both audio modes.  AFSK A uses LSB
and FC is set to MARK - 85 Hz (the center of the two RTTY
Tones).  DATA A is USB and FC is set to 1500 Hz (the center
of the transmit audio passband [200 - 2800 Hz]).

AFSK A also allows use of the AFSK transmit filter (a tight
filter around the Mark/Space tones to eliminate hum/pops/etc.)
and the use of the Dual Tone filter on receive.


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Re: [Elecraft] HP 8921 problems

[Fred Townsend]

Niel:
I think electrolytics are a good guess. Also selenium rectifiers but I don't
think that model uses them. 
The problem is aluminum electrolytics are not made anymore. You can
substitute polymer electrolytics but while they are electrically
interchangeable they are not form-fit interchangeable. Sometimes it takes
some mechanical rework to fit them in. 
I have seen aluminum electrolytics on the surplus market but they will be
old and unreliable. Your best bet is the polymers. You'll find them at
Digikey, Allied, and the like. 
73
Fred, AE6QL
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Niel
Skousen
Sent: Tuesday, March 17, 2015 2:00 PM
To: Elecraft Reflector; QRP-L Mailing List
Subject: [Elecraft] HP 8921 problems

Good Afternoon All,

I have an HP 8921 Service monitor, and when I powered it up today, it worked
for about 5 min...  then the power supply started to sag, the display
crashed, and I powered down.

Any one have any experience with HP8921 service ?Seems like the power
supply overloaded, and I can smell the smoke  8-(   but I cant see anything
obvious inside (eg puff'ed up / split electrolytic cap's in the power supply
etc)  Its been off for several months after a move.

Anybody with idea's or suggestions, please drop me a note off line

TIA

Niel
WA7SSA
nskousen (at) talisman-intl.com
nskousen (at) ecsecurityinc.com

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Re: [Elecraft] K3 DATA A vs AFSK A

[Jim Brown]

On Tue,3/17/2015 3:48 PM, Fred Jensen wrote:
What's still not clear is "why would I choose one over the other?" 
Operator/User manuals tend not to answer that question, they are 
understandably focused on exactly how to operate the equipment. 


Hi Fred,

AFSK A and FSK are for RTTY. They are set up to put the other guy's 
signal in the passband of the RX IF, so we can use filters on it. It's 
for "single-frequency", like we would do with MMTTY.  You want to work a 
different station, you tune the big knob.


DATA A is for digital software that has a multi-decoder function -- it 
decodes all the signals it can find in the 2.7 kHz bandwidth of an SSB 
rig. If we listen to the speaker (or headphones), we hear a bunch of 
signals, not only one. The usual computer display is spectrum and 
waterfall, similar to the P3. We choose which one we want to work by 
clicking on the decode string.


I use AFSK for RTTY and DATA A for everything else. For non-contest RTTY 
operation, I use WinWarbler, which is a sort of package for MMTTY, and 
allows a 2Tone window.


73, Jim K9YC


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Re: [Elecraft] K3 DATA A vs AFSK A

[Joe Subich, W4TV]

Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
(LSB) reverses the sense of the tones - Mark is the lower of the two
audio tones but the higher of the RF frequencies.

73,

   ... Joe, W4TV


On 2015-03-17 6:48 PM, Fred Jensen wrote:

Hmmm ... this may be the first time Fred Cady's book has failed me.  I
understand now "what" each mode does.  What's still not clear is "why
would I choose one over the other?"  Operator/User manuals tend not to
answer that question, they are understandably focused on exactly how to
operate the equipment.

I'm very sure that, when I first set up RTTY, I went to AFSK A because I
knew what audio frequency shift keying was and I didn't know what DATA A
was.  It all worked, so I never changed it or tried out the other
choice.  I guess if AFSK A is LSB and works with MMTTY in its default
configuration, then DATA A is USB and I'd have to reverse the tones in
MMTTY.

I'll leave it as I've been using it, it works so it obviously doesn't
need fixing.  I was just curious.  I have my "pitch" set at 915 Hz, I
can't hear 2,125 Hz.  Thanks Joe and Mike.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:


On 2015-03-17 12:41 PM, Fred Jensen wrote:
 > Can you 'splain the difference between AFSK and DATA A?

AFSK A and DATA A are both audio modes.  AFSK A uses LSB
and FC is set to MARK - 85 Hz (the center of the two RTTY
Tones).  DATA A is USB and FC is set to 1500 Hz (the center
of the transmit audio passband [200 - 2800 Hz]).

AFSK A also allows use of the AFSK transmit filter (a tight
filter around the Mark/Space tones to eliminate hum/pops/etc.)
and the use of the Dual Tone filter on receive.


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[Elecraft] K3 DATA A vs AFSK A

[Fred Jensen]

Hmmm ... this may be the first time Fred Cady's book has failed me.  I 
understand now "what" each mode does.  What's still not clear is "why 
would I choose one over the other?"  Operator/User manuals tend not to 
answer that question, they are understandably focused on exactly how to 
operate the equipment.


I'm very sure that, when I first set up RTTY, I went to AFSK A because I 
knew what audio frequency shift keying was and I didn't know what DATA A 
was.  It all worked, so I never changed it or tried out the other 
choice.  I guess if AFSK A is LSB and works with MMTTY in its default 
configuration, then DATA A is USB and I'd have to reverse the tones in 
MMTTY.


I'll leave it as I've been using it, it works so it obviously doesn't 
need fixing.  I was just curious.  I have my "pitch" set at 915 Hz, I 
can't hear 2,125 Hz.  Thanks Joe and Mike.


73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:


On 2015-03-17 12:41 PM, Fred Jensen wrote:
 > Can you 'splain the difference between AFSK and DATA A?

AFSK A and DATA A are both audio modes.  AFSK A uses LSB
and FC is set to MARK - 85 Hz (the center of the two RTTY
Tones).  DATA A is USB and FC is set to 1500 Hz (the center
of the transmit audio passband [200 - 2800 Hz]).

AFSK A also allows use of the AFSK transmit filter (a tight
filter around the Mark/Space tones to eliminate hum/pops/etc.)
and the use of the Dual Tone filter on receive.


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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[Harry Yingst via Elecraft]

That is the adapter to break the keying line


  From: mike 
 To: elecraft@mailman.qth.net 
 Sent: Tuesday, March 17, 2015 11:45 AM
 Subject: Re: [Elecraft] KPA500 suddenly low output - only 30 watts
   
Yep, a finicky cable was apparently the problem. I disconnected the two
E850463 AUX cables (KAT500 to KPA500 and KAT500 to K3 and swapped them, In
doing so I discovered I had a gender bender on the cable end that plugged
into the K3. It actually didn't change the gender (the K3 was a female and
the gender changer was male to female...go figure) and was definitely not
needed. Cannot explain how it got there! Anyway all is good now. Thanks all.
73  ..mike AI6II 



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[Elecraft] Wanted: P3

[Tim Cook]

Looking for a nice used P3,  if someone has one for sale please send
particulars in first email including price shipped to zip 45324.

 

Prefer to pay by PayPal.

 

Thanks 

Tim

NZ8J

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Re: [Elecraft] Audio Levels for WSJT on K2, etc.?

[Don Wilhelm]

Steve,

On the K2 with any data mode, run the audio up until you see one ALC 
bar, and then back it down until it just barely goes out.

That is the correct audio level - set the power to the level desired and go.

One thing about the K2 power level is that it is reset after a band 
change or a power level change.  That is better than creating a power 
spike.  It takes a couple of dits in CW or a few syllables in SSB mode.  
Because your data audio stream is not syllabic, it may take a bit longer 
for the K2 to adjust to the proper power level. There is no work-around 
that I know of other than doing a "throwaway" transmission into a dummy 
load after a band change or a power level change.


73,
Don W3FPR

On 3/17/2015 4:48 PM, Steve Kavanagh wrote:

I'm starting to play a bit with JT65 on HF (using WSJT-X) with my K2 and homebrew 
interface hardware.  The frequency response of the K2 seems reasonably flat, but 
occasionally I see power dropouts when the tones change.  This is despite always hitting 
the requested power at any audio frequency using the "tune" button in WSJT-X. 
It seems to happen less when I have plenty of audio drive - does it make sense that the 
K2 power control might get a bit confused by switching transients when there is only just 
enough audio to get the RF output up to the value set with the power knob? For those who 
are using WSJT modes on the K2 successfully, what ALC readings do you usually run at ? 
I'm hoping eventually to get the K2 going with transverters for VHF meteor scatter on 
FSK441 - is the stock OP1 filter wide/flat enough to work well for this mode?  S/N 4509 
is the older of my two K2s. Any other hints for using the K2 on WSJT modes? 73,Steve 
VE3SMA




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[Elecraft] HP 8921 problems

[Niel Skousen]

Good Afternoon All,

I have an HP 8921 Service monitor, and when I powered it up today, it worked 
for about 5 min...  then the power supply started to sag, the display crashed, 
and I powered down.

Any one have any experience with HP8921 service ?Seems like the power 
supply overloaded, and I can smell the smoke  8-(   but I cant see anything 
obvious inside (eg puff'ed up / split electrolytic cap's in the power supply 
etc)  Its been off for several months after a move.

Anybody with idea's or suggestions, please drop me a note off line

TIA

Niel 
WA7SSA
nskousen (at) talisman-intl.com
nskousen (at) ecsecurityinc.com

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[Elecraft] Audio Levels for WSJT on K2, etc.?

[Steve Kavanagh]

I forgot to mention that I am using RTTY(reverse) mode with SSBA = 2 and SSBCr 
= 1-1.  Do those settings make sense? Steve VE3SMA
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[Elecraft] Audio Levels for WSJT on K2, etc.?

[Steve Kavanagh]

I'm starting to play a bit with JT65 on HF (using WSJT-X) with my K2 and 
homebrew interface hardware.  The frequency response of the K2 seems reasonably 
flat, but occasionally I see power dropouts when the tones change.  This is 
despite always hitting the requested power at any audio frequency using the 
"tune" button in WSJT-X. It seems to happen less when I have plenty of audio 
drive - does it make sense that the K2 power control might get a bit confused 
by switching transients when there is only just enough audio to get the RF 
output up to the value set with the power knob? For those who are using WSJT 
modes on the K2 successfully, what ALC readings do you usually run at ? I'm 
hoping eventually to get the K2 going with transverters for VHF meteor scatter 
on FSK441 - is the stock OP1 filter wide/flat enough to work well for this 
mode?  S/N 4509 is the older of my two K2s. Any other hints for using the K2 on 
WSJT modes? 73,Steve VE3SMA 
 
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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[mike]

Well first of all, Ian, you won the right to yell Woo hoo and the knowledge
that you beat out about three others who figured it out at the same time. Of
course I also figured it out at the same time. Interestingly one fellow
suggested I 'read my manual', which of course I do daily (smile), but I
already knew the 10 pin controlled the the PTT inhibit. I just didn't
realize the gender changer had the 10 pin removed until I picked it up again
and saw the writing on it for the first time. Getting old and don't always
see things at first glance.

And speaking of getting old this thread is going way past its due. So let's
beat Wayne to the draw and close it!

Best 73 to all.  ..mike  AI6II



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[Elecraft] AF1 sold

[Carl Yaffey]

Carl Yaffey  K8NU
Recording studio.
cyaffeyno_s...@gmail.com 
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com








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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[Ian - Ham]

Woo hoo! What'd I win? What'd I win?  :-)

--Ian
Ian Kahn, KM4IK
Roswell, GA  EM74ua
km4ik@gmail.com
Please join me in the Georgia QSO Party April 11-12, 2015.  Info at
http://www.georgiaqsoparty.org.
10-10 #74624, North Georgia Chapter #2038
PODXS 070 #1962
K3# 281, P3 #688, KAT500 #860, KPA500 #1468

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of mike
Sent: Tuesday, March 17, 2015 4:32 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 suddenly low output - only 30 watts

RIGHT! Ian wins the prize. Good for you.  73 ..mike AI6II



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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[mike]

RIGHT! Ian wins the prize. Good for you.  73 ..mike AI6II



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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[mike]

Wait, it was not KL INT, but KY INT for 'key interrupter'. I think I have it
figured out. 

I recently sold my SteppIR vertical which required me to use the PTT Key
line to prevent the amp from keying while the SteppIR was moving. This piece
was used to interrupt the PTT in the AUX cables (missing the 10 pin.) So
when I removed the cables for the PTT key lines, I just forgot to take this
little part off. 

Good, that 'splanins it and tells me I was not keying the amp for the last
three and a half weeks. Maybe Elecraft should develop a flashing red light
to warn a guy that he is not keying the amp when he thinks he is . just
kidding!  73 ..mike  AI6II



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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[Ian - Ham]

Perhaps you intended it as the line interrupt for the KPA500?

73 de,

--Ian
Ian Kahn, KM4IK
Roswell, GA  EM74ua
km4ik@gmail.com
Please join me in the Georgia QSO Party April 11-12, 2015.  Info at
http://www.georgiaqsoparty.org.
10-10 #74624, North Georgia Chapter #2038
PODXS 070 #1962
K3# 281, P3 #688, KAT500 #860, KPA500 #1468

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of mike
Sent: Tuesday, March 17, 2015 4:11 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 suddenly low output - only 30 watts

Nope, not a Null Modem, just a gender changer with the #10 pin clipped (upon
closer inspection.) And I had written on it KL INT or maybe INT KL for which
I have no idea as to the meaning. But no worries it all works great now. ;>)
73  ..mike  AI6II



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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[mike]

Nope, not a Null Modem, just a gender changer with the #10 pin clipped (upon
closer inspection.) And I had written on it KL INT or maybe INT KL for which
I have no idea as to the meaning. But no worries it all works great now. ;>) 
73  ..mike  AI6II



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[Elecraft] AF1 audio filter for sale

[Carl Yaffey]

>From the SK estate.
Picture here:   http://www.carl-yaffey.com/estate_sale.html
$40 shipped CONUS.

Carl Yaffey  K8NU
Recording studio.
cyaffeyno_s...@gmail.com 
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com








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Re: [Elecraft] IQ output of KX3 to PX3

[Phil Wheeler]

Odd thing, Mike: I looked for that under KX3 App 
Notes at the website and cannot find it.


Phil W7OX

On 3/17/15 12:34 PM, Mike Lichtman via Elecraft wrote:

ELECRAFT KX3 Application Note
Determining I and Q signal output levels
Revision A, February, 2013
Copyright © 2013, Elecraft, Inc.; All Rights Reserved
Background
The KX3 provides a way to connect to popular Software Defined Radio (SDR) 
programs. Most of these
programs utilize a PC-based soundcard to import the I and Q signals into these 
programs. This Application
Note discusses the I and Q signals provided by the KX3 for this purpose.
Determining the I and Q signal levels in the KX3
Equipment required:
• Dual channel Oscilloscope with at least 10mv per division sensitivity
• Signal Generator with -73dbm output. An XG3 or equivalent will work.
• 2.5 mm Stereo phone plug or other means to bring out the I and Q signals from 
the I/Q Jack
Procedure:
1. Connect the oscilloscope vertical inputs to the tip and ring of the phone 
plug and plug into the IQ output
jack
2. Set up signal generator to supply a S9 (-73 dBm ) signal to the KX3 antenna 
connector.
3. Tune the radio to the signal supplied by the signal generator.
4. In the KX3 menu go to " RX I/Q " Set it to "On"
5. With the Oscilloscope set to 500us per division and 10 mv you should see 
something similar to the
picture below. Note that one trace is shifted in phase to the other by 90 
degrees.
Elecraft •www.elecraft.com  • 831-763-4211
Guidelines for using a KX3 I and Q signals with an SDR
• Check configuration of your PC's soundcard for Recording devices and levels. 
We have
found that many PCs default to Line level inputs rather than Mic level inputs.
• Confirm that the Mic input is set up for Stereo inputs. We see many PC's - 
laptops mostly -
do not have a 2nd channel for the Microphone input. This will not work, of 
course, with the
KX3/SDR setup as there are 2 complete channels required for I and Q signals to 
be
amplified.
• Once set up for Mic input, ensure that all Input Level sliders are set to 
their mid point.
Many drivers will have a +10/+20dB boost slider. Noise floor will rise with its 
use but the
signal will appear in an SDR easier. We have seen that some soundcard drivers 
will also
provide a handy bar graph of VU metering to allow you to see whether there's 
I/Q coming
into the PC.
• Bring up whatever SDR software program and ensure that it has been configured 
to select
the appropriate soundcard links for input and output.
• Monitor the levels of the I/Q with that program. Most of the SDR programs 
have some
form of level indicator for input.
Eliminating Ground Loops with PC soundcards – Hum and Noise
At times, we get reports of noise and hum on the I and Q signals. Typically, we 
find this is due to
use with a PC with floating soundcard inputs which may create ground loops. In 
turn, this creates
extra noise on the I and Q signals input into the soundcard. Additionally, 
noisy brick power
supplies can raise the noise floor further.
Generally, the use of isolation transformers will break the ground loops 
between a PC soundcard
and the KX3's outputs. These are typically available from Radio Shack, 
PAC-Audio and
Amazon.com, although some adapting of the connectors may be required for the 
2.5mm connector
on the KX3 I/Q port.


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[Elecraft] IQ output of KX3 to PX3

[Mike Lichtman via Elecraft]

I received this bulletin from Elecraft a while ago when I was trying to 
diagnose a problem. I think it has what you need. 73 Mike KF6KXG
ELECRAFT KX3 Application Note
Determining I and Q signal output levels
Revision A, February, 2013
Copyright © 2013, Elecraft, Inc.; All Rights Reserved
Background
The KX3 provides a way to connect to popular Software Defined Radio (SDR) 
programs. Most of these
programs utilize a PC-based soundcard to import the I and Q signals into these 
programs. This Application
Note discusses the I and Q signals provided by the KX3 for this purpose.
Determining the I and Q signal levels in the KX3
Equipment required:
• Dual channel Oscilloscope with at least 10mv per division sensitivity
• Signal Generator with -73dbm output. An XG3 or equivalent will work.
• 2.5 mm Stereo phone plug or other means to bring out the I and Q signals from 
the I/Q Jack
Procedure:
1. Connect the oscilloscope vertical inputs to the tip and ring of the phone 
plug and plug into the IQ output
jack
2. Set up signal generator to supply a S9 (-73 dBm ) signal to the KX3 antenna 
connector.
3. Tune the radio to the signal supplied by the signal generator.
4. In the KX3 menu go to " RX I/Q " Set it to "On"
5. With the Oscilloscope set to 500us per division and 10 mv you should see 
something similar to the
picture below. Note that one trace is shifted in phase to the other by 90 
degrees.
Elecraft • www.elecraft.com • 831-763-4211
Guidelines for using a KX3 I and Q signals with an SDR
• Check configuration of your PC's soundcard for Recording devices and levels. 
We have
found that many PCs default to Line level inputs rather than Mic level inputs.
• Confirm that the Mic input is set up for Stereo inputs. We see many PC's - 
laptops mostly -
do not have a 2nd channel for the Microphone input. This will not work, of 
course, with the
KX3/SDR setup as there are 2 complete channels required for I and Q signals to 
be
amplified.
• Once set up for Mic input, ensure that all Input Level sliders are set to 
their mid point.
Many drivers will have a +10/+20dB boost slider. Noise floor will rise with its 
use but the
signal will appear in an SDR easier. We have seen that some soundcard drivers 
will also
provide a handy bar graph of VU metering to allow you to see whether there's 
I/Q coming
into the PC.
• Bring up whatever SDR software program and ensure that it has been configured 
to select
the appropriate soundcard links for input and output.
• Monitor the levels of the I/Q with that program. Most of the SDR programs 
have some
form of level indicator for input.
Eliminating Ground Loops with PC soundcards – Hum and Noise
At times, we get reports of noise and hum on the I and Q signals. Typically, we 
find this is due to
use with a PC with floating soundcard inputs which may create ground loops. In 
turn, this creates
extra noise on the I and Q signals input into the soundcard. Additionally, 
noisy brick power
supplies can raise the noise floor further.
Generally, the use of isolation transformers will break the ground loops 
between a PC soundcard
and the KX3's outputs. These are typically available from Radio Shack, 
PAC-Audio and
Amazon.com, although some adapting of the connectors may be required for the 
2.5mm connector
on the KX3 I/Q port.
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Re: [Elecraft] K3 macro for TEXT DEC On/Off?

[Tom Blahovici]

Hi
Nope not possible. The US and DN command is not working on the K3 or kx3. It 
never has.  Unfortunately it never makes it to the firmware todo list. 
There is a way though, and that is to use the k3/0 protocol.
Tom
va2fsq.com

On Mar 17, 2015 3:15 PM, Rick WA6NHC  wrote:
>
> Push the DISP button and watch the voltage instead or the clock or...?  ;o)
>
> Rick nhc
>
> On 3/17/2015 11:42 AM, Nick Kennedy wrote:
> > Is there a way to write a macro for one-button switching of receive text 
> > decode on and off?  I like to use text decode while QSOing or monitoring, 
> > but when that’s not happening, I’d rather have the display doing something 
> > useful instead of showing E E E E T T E T, etc.
> >
> > I looked at the programming reference and the Help in the K3 utility.  I 
> > see how to simulate holding the button, but if it’s possible to feed the 
> > rig the parameter for OFF-TX ONLY-RX slow speeds and RX-high speeds, I 
> > haven’t seen the method.
> >
> > TU / 73-
> >
> > Nick, WA5BDU
>
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Re: [Elecraft] K3 macro for TEXT DEC On/Off?

[Rick WA6NHC]

Push the DISP button and watch the voltage instead or the clock or...?  ;o)

Rick nhc

On 3/17/2015 11:42 AM, Nick Kennedy wrote:

Is there a way to write a macro for one-button switching of receive text decode 
on and off?  I like to use text decode while QSOing or monitoring, but when 
that’s not happening, I’d rather have the display doing something useful 
instead of showing E E E E T T E T, etc.

I looked at the programming reference and the Help in the K3 utility.  I see 
how to simulate holding the button, but if it’s possible to feed the rig the 
parameter for OFF-TX ONLY-RX slow speeds and RX-high speeds, I haven’t seen the 
method.

TU / 73-

Nick, WA5BDU


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[Elecraft] K3 macro for TEXT DEC On/Off?

[Nick Kennedy]

Is there a way to write a macro for one-button switching of receive text decode 
on and off?  I like to use text decode while QSOing or monitoring, but when 
that’s not happening, I’d rather have the display doing something useful 
instead of showing E E E E T T E T, etc.

I looked at the programming reference and the Help in the K3 utility.  I see 
how to simulate holding the button, but if it’s possible to feed the rig the 
parameter for OFF-TX ONLY-RX slow speeds and RX-high speeds, I haven’t seen the 
method.

TU / 73-

Nick, WA5BDU
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[Elecraft] OT - looking for Ten Tec TP-41 Enclosure

[Jim's Desktop]

Shot in the dark, but I'm in need of an unused Ten Tec TP-41 enclosure 
for a receiver project I'm working on.  If anyone has one they'll part 
with, (I don't care if it's scratched up, just no holes drilled in it) 
please email me direct with your asking price.


Thanks,

Jim - W0EB





Memo to NSA, DHS, FBI, CIA, DIA, DEA, ATF, KGB, MI5, and any other 
alphabet soup agencies that might be listening/reading/tracking my email 
content,  I share this computer with an old lady, an ex-con, a priest, a 
used car salesman, a military veteran, a pacifist, a vegetarian, a 
hunter, a circus midget, a local politician, a doberman and a demented 
cat...so any data you collect from me will be meaningless, random and 
therefore useless...good luck.

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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[Phil Kane]

On 3/17/2015 8:45 AM, mike wrote:
>  In
> doing so I discovered I had a gender bender on the cable end that plugged
> into the K3. It actually didn't change the gender (the K3 was a female and
> the gender changer was male to female...go figure) 

That sounds more like a "null modem" than a "gender bender".  Could be
wrong.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

>From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
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Re: [Elecraft] K3 DATA A vs USB for JT65/JT9

[Mike Reublin NF4L]

Per page 31 of the K3 owners manual sez

DATA A can be used for all audio-shift transmission modes, including AFSK and 
PSK-31. VFO A shows the transmit suppressed carrier frequency and USB is normal 
for DATA A. Compression is automatically set to 0 to reduce transmitted signal 
distortion.

AFSK A is also an audio-shift transmission but is optimized for RTTY. VFO A 
displays the RTTY mark frequency and LSB is normal. The built-in text decoder 
and the dual-passband RTTY filter can be used.

73, Mike NF4L
 
> On Mar 17, 2015, at 12:41, Fred Jensen  wrote:
> 
> Can you 'splain the difference between AFSK and DATA A?  I have been running 
> RTTY in AFSK using MMTTY and the sound in/out from my "radio laptop."  Just 
> two stereo cables using LINE IN/OUT on the back of the K3, no other interface 
> hardware.  VOX for PTT.  It seems to work fine, am I missing something?
> 
> 73,
> 
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> - www.cqp.org
> 
> On 3/16/2015 7:55 PM, Don Wilhelm wrote:
>> Sam,
>> 
>> You are doing it right.
>> 
>> DATA A mode is like SSB with the following exceptions:
>> 1) TX EQ is disabled in DATA A mode
>> 2) Audio compression is disabled in DATA A mode.
>> 3) one can set the audio input to LINE IN for DATA A mode - no need to
>> change it from MIC audio when using data modes.
> 
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Re: [Elecraft] K3 DATA A vs USB for JT65/JT9

[Joe Subich, W4TV]

On 2015-03-17 12:41 PM, Fred Jensen wrote:
> Can you 'splain the difference between AFSK and DATA A?

AFSK A and DATA A are both audio modes.  AFSK A uses LSB
and FC is set to MARK - 85 Hz (the center of the two RTTY
Tones).  DATA A is USB and FC is set to 1500 Hz (the center
of the transmit audio passband [200 - 2800 Hz]).

AFSK A also allows use of the AFSK transmit filter (a tight
filter around the Mark/Space tones to eliminate hum/pops/etc.)
and the use of the Dual Tone filter on receive.

73,

  ... Joe, W4TV


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Re: [Elecraft] K3 DATA A vs USB for JT65/JT9

[Fred Jensen]

Can you 'splain the difference between AFSK and DATA A?  I have been 
running RTTY in AFSK using MMTTY and the sound in/out from my "radio 
laptop."  Just two stereo cables using LINE IN/OUT on the back of the 
K3, no other interface hardware.  VOX for PTT.  It seems to work fine, 
am I missing something?


73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 3/16/2015 7:55 PM, Don Wilhelm wrote:

Sam,

You are doing it right.

DATA A mode is like SSB with the following exceptions:
1) TX EQ is disabled in DATA A mode
2) Audio compression is disabled in DATA A mode.
3) one can set the audio input to LINE IN for DATA A mode - no need to
change it from MIC audio when using data modes.


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Re: [Elecraft] KPA500 suddenly low output - only 30 watts

[mike]

Yep, a finicky cable was apparently the problem. I disconnected the two
E850463 AUX cables (KAT500 to KPA500 and KAT500 to K3 and swapped them, In
doing so I discovered I had a gender bender on the cable end that plugged
into the K3. It actually didn't change the gender (the K3 was a female and
the gender changer was male to female...go figure) and was definitely not
needed. Cannot explain how it got there! Anyway all is good now. Thanks all.
73  ..mike AI6II 



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[Elecraft] K3 TX INH

[GRANT YOUNGMAN]

Has anyone used the K3’s TX INH line to implement a Ten-Tec style keying loop 
for QSK?  If so, were there any issues?

Grant NQ5T
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Re: [Elecraft] KX3 IQ Outputs - What to expect?

[John Huggins, kx4o]

On Tue, March 17, 2015 05:16, Peter Lambert wrote:
Thanks Peter.  Good clues and I will have a look.  Schematics printed and
heading to work where we maintain an electronics lab that is an
anti-static wonderland.

I wonder, though, if there isn't some external forensics to try first.  I
mean if the I or Q are not proper at the points you mention, there should
be some evidence in the operation right?  Although I do note proper I an Q
levels when the VFO is close to the test frequency and within the
demodulating bandwidth.

Elecraft has been sent a note along with o-scope plots of the IQ out
connector, but I will perform a visual inspection of the spots you
mention.

John

> Hello again John,
>
>
> Looking at the schematic, any difference you see should be so slight that
>  you'd not make comment on it.  If it were me I'd take a look at the
> inductors LD-LG (on page 4 of the schematic) to see if there is the
> possibility of one of them being shorted.  I haven't had look at these
> but it's common to twist the terminating wires together - a likely spot
> for a short.
>
> I'd stick the CRO on the output of each of the 4 inductors (where the
> circuit shows "RX_I" and "RX_Q" and the opposite side of C1K and C1L) all
> the levels here should be pretty much identical.
>
> Of course you can only expect this over the range of +- 96kHz or so.
>
>
> 73's Peter VK4JD
>
>


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[Elecraft] ELECRAFT K3/0 FOR SALE

[Paul DeFelice]

K3/0 (not mini) for sale. Includes RRK0CBL cable set. Excellent condition -
nonsmoking environment. $500.00 plus shipping.

Please contact me off the reflector: k9nu at mchsi.com.

73,

Paul K9NU

 

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Re: [Elecraft] New Product to help many K3/KX3 users

[Neil Zampella]

But ... it isn't April 1st yet !!!

On 03/16/15 08:24 pm, James kvochick wrote:

https://factualradio.wordpress.com/2015/03/16/geen-idee-engineering-companion-radio-assistant-peripheral/
 


Now we’re getting some place!





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