Re: [digitalradio] Re: Digital Modes Presentation (Need Help)

2009-01-13 Thread Ian Wade
From: Miroslav Skoric sko...@ptt.yu
Date: Tue, 13 Jan 2009   Time: 07:39:26

PS: Is there available a short audiovisual sequence of an AX.25 packet
signals for download? I'd like to present to the conference audience
something like packet audio burst being received and have it decoded on
the computer screen (or a short keyboard-to-keyboard conversation
between tho ham packet users, or so), but in my area there are no
reliable correspondents anymore to make a recording of that.


Misko,

A few years ago I was on vacation in New Zealand, and was asked to give 
a talk on AX.25 to a local radio club. I didn't have any lecture 
material or packet equipment with me, so I had to draw simple diagrams 
during the lecture itself.

A few minutes into the lecture I had the idea to get the audience to 
take part, by pretending to be AX.25 stations. As you know, New Zealand 
is the land of sheep, and everyone is very familiar with the sound of 
sheep. So I demonstrated the sound of an AX.25 signal by emitting a long 
B (representing an AX.25 connect packet), and a short Ba 
(representing an ack packet). The sounds were not very accurate (!), but 
they got the idea.

Then I invited a couple of people in the audience to do the same. A QSO 
followed, with the Bs and Bas going backwards and forwards in 
both directions.

Then I got two more people to set up another QSO. Of course, some of the 
Bs and Bas collided, so this was to opportunity to talk about 
retries and hidden stations.

Then I set up a digipeater, with other people relaying the Bs and 
Bas, but with the Bs and Bas extended to Bas and Baas 
because of the additional packet headers..

Then I set up a national 8-digipeater network, so that eventually 
everyone in the audience was taking part. Complete and utter chaos! But 
it was great fun, and I do believe the audience actually learnt 
something!

So you don't always need high tech aids when giving lectures. Good luck 
with yours.

-- 
73
Ian, G3NRW
































Re: [digitalradio] MFTTY 3.0.143 is out

2009-01-13 Thread Noel Keen
Yyuyyq
-Original Message-
Date: Tuesday, January 13, 2009 12:27:17 am
To: digitalradio@yahoogroups.com
From: Steinar Aanesland saa...@broadpark.no
Subject: Re: [digitalradio] MFTTY 3.0.143 is out


Hi Richmond 

I have not tested this last version yet.
I will give it a try when I am back from work.

73


W6IDS wrote:
 Hey, Steiner

 I have it installed.  Before I did anything else, I modified the Pilot CQ to 
 add my callsign
 and Grid Locator (EM79).  When I selected the Pilot CQ (I'm using the SEND 
 button
 now) I found four tone beeps  transmissions being transmitted.  When I 
 pressed the
 SEND button, I transmitted the CQ sequence but with no PILOT Tones.

 My Pilot CQ is:

 PilotCQ CQ CQ DE W6IDS W6IDS EM79
 PilotCQ CQ ..etc etc etc

 HmmmI'm not totally clear on what's happening or if I accidentally
 did something wrong in modifying the Pilot CQ.  Can you clarify your
 sentence abut the Pilot Tone below also?

 Howard W6IDS
 Richmond, IN


   





[digitalradio] Re: AX.25 modem as an infrastructure?

2009-01-13 Thread Vojtech Bubnik
Hi Misko.

I used to play with AX.25 a lot when I was a teenager. You have two
major problems when designing the kind of ad hoc network you are
proposing: hidden transmitters and protocol overhead. With 1200Bd
shared bandwidth you do not have much wiggle room to cope with either
of them.

With your ad-hoc approach you would either broadcast data to all nodes
in the network (APRS approach), or broadcast routing tables (FlexNet
approach) or broadcast request to connect (I don't know any such AX.25
system). Would you be more specific about your approach? Into which
category it falls?

Flexnet was probably the best AX.25 system designed with working auto
router, but still it took some time before the routing tables were
updated after a station connected / disconnected. And it was using
dedicated links between nodes, so there was no hidden transmitter problem.

73, Vojtech OK1IAK




Re: [digitalradio] MFTTY 3.0.143 is out

2009-01-13 Thread 7L4IOU
Hi Steinar

very interesting mode
I will QRV 7.039 around 21:00z

73 Hisami 7L4IOU


MFTT 3.0.143


# Pilot Tone will be inserted automatically after a transmission pause
of equivalent 4 words time
# Thin grey line added to spectrum display, indicating the center
frequency of Rx-Band-Pass-Filter
# Double click on Rx . Hz will copy the Tx freq.
# Double click on Tx . Hz will copy the Rx freq.
# Tool Tip Text added to UI elements


Download it from :
http://www.polar-electric.com/MFTT/index.html

73 de LA5VNA Steinar




Re: [digitalradio] MFTTY 3.0.143 is out

2009-01-13 Thread 7L4IOU
Hi Steinar

very interesting mode
I will QRV 7.039 around 21:00z

73 Hisami 7L4IOU


MFTT 3.0.143


# Pilot Tone will be inserted automatically after a transmission pause
of equivalent 4 words time
# Thin grey line added to spectrum display, indicating the center
frequency of Rx-Band-Pass-Filter
# Double click on Rx . Hz will copy the Tx freq.
# Double click on Tx . Hz will copy the Rx freq.
# Tool Tip Text added to UI elements


Download it from :
http://www.polar-electric.com/MFTT/index.html

73 de LA5VNA Steinar




Re: [digitalradio] Re: MFTTY 3.0.143 is out

2009-01-13 Thread W6IDS

I understand, Norbert, now.

Hthe information I read leads me to believe (and it's stated as 
such)
that the greater frequency of Pilot tones provides an aid to tuning.  IMHO,
it seems to me that the pause time that you stated is a bit too long to 
provide
benefit.  I don't know where I'd pause for an equivalent of 20 characters.

Right now, I am seeing a Pilot tone only at the beginning of the CQ
in which I included my callsign, City/State and Locator.  I think it could 
be
inserted by the operator at the end of each line of CQ for tuning.  I also
noticed that without looking at the screen, I instantly recognized the
signal by WB4MWD by virtue of the inclusion of the Pilot tones.  First
time I've been able to identify an exotic mode by ear per se, so the tones
have an additional value.

I think we just need to adopt a reasonable protocol for the tone use and
also allow for manual insertion as needed.

Howard W6IDS
Richmond, IN

- Original Message - 
From: Norbert Pieper polar_elect...@yahoo.com
To: digitalradio@yahoogroups.com
Sent: Tuesday, January 13, 2009 4:55 AM
Subject: [digitalradio] Re: MFTTY 3.0.143 is out


 Hello Howard and all,

 In fact the V3.0143 !!DOES!!- send out pilot tone by SEND button
 or Send By Enter Key

 The thing is that the pilot is sent out ONLY if there was a
 reasonable pause between the transmissions. I did set the pause time
 to a value that is equivalent to the transmission time of 4 Words
 (20 characters)

 This was done to avoid an un-needed flood of bothering pilots.

 My question to the group is:
 In Pratice:
 Is that pause time and the effective number of pilots sufficent or
 is there higher or lower occurrence of pilots needed?
 


Re: [digitalradio] Re: MFTTY 3.0.143 is out

2009-01-13 Thread kh6ty


 I think we just need to adopt a reasonable protocol for the tone use and
 also allow for manual insertion as needed.

 Howard W6IDS
 Richmond, IN



Howard, for manual Pilot insertion, just configure a macro as only Pilot 
and click that to insert a Pilot whenever you want.

What I think FMTTY needs more than anything is the ability to double-click 
on a callsign and use it for the macros, such as CALL (for the other 
station's callsign). I cannot seem to get the TxMacro boxes to work. When I 
configure a macro with Box1 and put a callsign in for Box 1, I still get 
Box1 transmitting instead of the callsign. The macros also need to be 
linked to function keys for ease of keyboarding use. There really is not 
enough time to fill in the TxMacro box for every QSO. You have to capture a 
callsign as quickly as possible in order to keep from losing a contact. A 
double-click has proven to be the fastest way to do that.

For example, the significant default DigiPan macros which many are familiar 
with are:

F2 CQ
F3 Call 3 (transmit, 3x3, 3x3, 3x3, receive)
F4 Call (transmit, 1x1)
F5 BTU (1x1, receive)
F6 Signoff (73, 1x1, SK, receive)

This way, the new user only has to press F2 to call CQ, F3 to answer a CQ, 
and then just alternate between F4 and F5 for the QSO. When finished, he 
just goes to the next function key in line to signoff.

Of course preferences of others may vary!

73, Skip KH6TY



Re: [digitalradio] Re: MFTTY 3.0.143 is out

2009-01-13 Thread Siegfried Jackstien
the macro-name for box1 is Name ... for box2 it is Call
that should solve the problem
greetz
dg9bfc
  - Original Message - 
  From: kh6ty 
  To: digitalradio@yahoogroups.com 
  Sent: Tuesday, January 13, 2009 5:05 PM
  Subject: Re: [digitalradio] Re: MFTTY 3.0.143 is out




   I think we just need to adopt a reasonable protocol for the tone use and
   also allow for manual insertion as needed.
  
   Howard W6IDS
   Richmond, IN
  

  Howard, for manual Pilot insertion, just configure a macro as only Pilot 
  and click that to insert a Pilot whenever you want.

  What I think FMTTY needs more than anything is the ability to double-click 
  on a callsign and use it for the macros, such as CALL (for the other 
  station's callsign). I cannot seem to get the TxMacro boxes to work. When I 
  configure a macro with Box1 and put a callsign in for Box 1, I still get 
  Box1 transmitting instead of the callsign. The macros also need to be 
  linked to function keys for ease of keyboarding use. There really is not 
  enough time to fill in the TxMacro box for every QSO. You have to capture a 
  callsign as quickly as possible in order to keep from losing a contact. A 
  double-click has proven to be the fastest way to do that.

  For example, the significant default DigiPan macros which many are familiar 
  with are:

  F2 CQ
  F3 Call 3 (transmit, 3x3, 3x3, 3x3, receive)
  F4 Call (transmit, 1x1)
  F5 BTU (1x1, receive)
  F6 Signoff (73, 1x1, SK, receive)

  This way, the new user only has to press F2 to call CQ, F3 to answer a CQ, 
  and then just alternate between F4 and F5 for the QSO. When finished, he 
  just goes to the next function key in line to signoff.

  Of course preferences of others may vary!

  73, Skip KH6TY



   

Re: [digitalradio] Re: MFTTY 3.0.143 is out

2009-01-13 Thread W6IDS

Hey, Skip!  Long time no.

Yes, I think you're touching on some things that could go well toward
enhancing the operation.  I, too, am having a little difficulty with the
TX Macro box as well.  However, I suspect that if we keep the
cards 'n letters coming in, there'll be some attention given to the
ideas for sure.

HI had not thought about using a marco for the Pilot
thingie.  DUH!  I've been trying it by manually typing it in.   I wasn't
thinking macro in that instance.

Trying to capture the callsign, QTH, etc does take time and causes
dead time too, not to mention creating a cumbersome process.
But, then again, this is new as we are awareand interesting.

So far, I'm one up on the receiver side.  Still working to get my first
transmit check out moment.

Regards,

Howard W6IDS
Richmond, IN

- Original Message - 
From: kh6ty kh...@comcast.net
To: digitalradio@yahoogroups.com
Sent: Tuesday, January 13, 2009 11:05 AM
Subject: Re: [digitalradio] Re: MFTTY 3.0.143 is out




 I think we just need to adopt a reasonable protocol for the tone use and
 also allow for manual insertion as needed.

 Howard W6IDS
 Richmond, IN



 Howard, for manual Pilot insertion, just configure a macro as only Pilot
 and click that to insert a Pilot whenever you want.

 What I think FMTTY needs more than anything is the ability to double-click
 on a callsign and use it for the macros, such as CALL (for the other
 station's callsign). I cannot seem to get the TxMacro boxes to work. When 
 I
 configure a macro with Box1 and put a callsign in for Box 1, I still get
 Box1 transmitting instead of the callsign. The macros also need to be
 linked to function keys for ease of keyboarding use. There really is not
 enough time to fill in the TxMacro box for every QSO. You have to capture 
 a
 callsign as quickly as possible in order to keep from losing a contact. A
 double-click has proven to be the fastest way to do that.

 For example, the significant default DigiPan macros which many are 
 familiar
 with are:

 F2 CQ
 F3 Call 3 (transmit, 3x3, 3x3, 3x3, receive)
 F4 Call (transmit, 1x1)
 F5 BTU (1x1, receive)
 F6 Signoff (73, 1x1, SK, receive)

 This way, the new user only has to press F2 to call CQ, F3 to answer a CQ,
 and then just alternate between F4 and F5 for the QSO. When finished, he
 just goes to the next function key in line to signoff.

 Of course preferences of others may vary!

 73, Skip KH6TY


 

 Announce your digital presence via our Interactive Sked Page at
 http://www.obriensweb.com/sked



 Yahoo! Groups Links






Re: [digitalradio] Re: MFTTY 3.0.143 is out

2009-01-13 Thread kh6ty
Thanks Seigfried! That works now. I could not find where that was in the 
Help.

Now, if Norbert can only code a double-click to enter the call in Box2, that 
would be great. I know that it is possible under VB6 as I always code it 
that way in my own VB PSK31 programs. For example, I code according to the 
following double-click rules (double-clicking in Windows usually 
automatically selects a word, as I remember.):

1. If the word contains three consecutive numbers, it goes into the RST 
field.

2. If the word contains one or two numbers, it goes into the callsign 
field.

3. If the word has no numbers, it goes into the operator name field.

4. For QTH, I select all the words and use a right-click context menu to 
enter the text into the QTH field.

I do not attempt to distinguish between something like PSK31 and a 
callsign, but rely on the human brain to make the distinction by where the 
operator makes the double-click selection.

73, Skip KH6TY



- Original Message - 
From: Siegfried Jackstien siegfried.jackst...@freenet.de
To: digitalradio@yahoogroups.com
Sent: Tuesday, January 13, 2009 12:07 PM
Subject: Re: [digitalradio] Re: MFTTY 3.0.143 is out


the macro-name for box1 is Name ... for box2 it is Call
that should solve the problem
greetz
dg9bfc
  - Original Message - 
  From: kh6ty
  To: digitalradio@yahoogroups.com
  Sent: Tuesday, January 13, 2009 5:05 PM
  Subject: Re: [digitalradio] Re: MFTTY 3.0.143 is out




   I think we just need to adopt a reasonable protocol for the tone use and
   also allow for manual insertion as needed.
  
   Howard W6IDS
   Richmond, IN
  

  Howard, for manual Pilot insertion, just configure a macro as only Pilot
  and click that to insert a Pilot whenever you want.

  What I think FMTTY needs more than anything is the ability to double-click
  on a callsign and use it for the macros, such as CALL (for the other
  station's callsign). I cannot seem to get the TxMacro boxes to work. When 
I
  configure a macro with Box1 and put a callsign in for Box 1, I still get
  Box1 transmitting instead of the callsign. The macros also need to be
  linked to function keys for ease of keyboarding use. There really is not
  enough time to fill in the TxMacro box for every QSO. You have to capture 
a
  callsign as quickly as possible in order to keep from losing a contact. A
  double-click has proven to be the fastest way to do that.

  For example, the significant default DigiPan macros which many are 
familiar
  with are:

  F2 CQ
  F3 Call 3 (transmit, 3x3, 3x3, 3x3, receive)
  F4 Call (transmit, 1x1)
  F5 BTU (1x1, receive)
  F6 Signoff (73, 1x1, SK, receive)

  This way, the new user only has to press F2 to call CQ, F3 to answer a CQ,
  and then just alternate between F4 and F5 for the QSO. When finished, he
  just goes to the next function key in line to signoff.

  Of course preferences of others may vary!

  73, Skip KH6TY





Internal Virus Database is out of date.
Checked by AVG - http://www.avg.com
Version: 8.0.138 / Virus Database: 270.9.2/1785 - Release Date: 11/13/2008 
9:12 AM




[digitalradio] New Version .144

2009-01-13 Thread Russell Blair
A New Version 3.0.144 with some up grades

Russell

   = 
IN GOD WE TRUST ! 
= 
Russell Blair (NC5O)  Skype-Russell.Blair  Hell Field #300  DRCC #55  30m 
Dig-group #693


  


[digitalradio] qrv on mfttty 20 and 80 m.

2009-01-13 Thread F.R. Ashley
QRV 14.068  MFTTY  USB / 3991 USB

WB4M  2357z   1/13/09
- Original Message - 
From: Norbert Pieper polar_elect...@yahoo.com
To: digitalradio@yahoogroups.com
Sent: Saturday, January 10, 2009 10:35 AM
Subject: [digitalradio] Re: MFTTY on 80m


 Hello Howard,
 
 The issue is solved:
 Cause of Problem: the file c:\Window\system32\dx8vb.dll is not 
 registered.
 
 Solution: Download and install new version of MFTT it will fix the 
 Problem automatically.
 
 BR Norbert
 
 --- In digitalradio@yahoogroups.com, W6IDS w6...@... wrote:

 Forgot to mention, if it matters, that I'm running VISTA.
 
 Howard W6IDS
 
 - Original Message - 
 From: W6IDS w6...@...
 To: digitalradio@yahoogroups.com
 Sent: Thursday, January 08, 2009 10:46 PM
 Subject: Re: [digitalradio] MFTTY on 80m
 
 
  
  Hey, Steinar!
  
  Tried to bring up MFTTY but encountered a problem.
  
  I get this flag:
  
  Run Time Error '429':
  
  ActiveX component can't create object.
  
  Howard W6IDS
  Richmond, IN
  
  - Original Message - 
  From: Steinar Aanesland saa...@...
  To: digitalradio@yahoogroups.com
  Sent: Wednesday, January 07, 2009 11:35 AM
  Subject: [digitalradio] MFTTY on 80m
  
  
  Hi all,
  
  I am monitoring dial 3588 USB (1000Hz) now 
  
  
  
  Announce your digital presence via our Interactive Sked Page at
  http://www.obriensweb.com/sked
  
  
  
  Yahoo! Groups Links
  
  
 

 
 
 
 
 
 Announce your digital presence via our Interactive Sked Page at
 http://www.obriensweb.com/sked
 
 
 
 Yahoo! Groups Links
 
 
 


Re: [digitalradio] Re: MFTTY 3.0.143 is out

2009-01-13 Thread Siegfried Jackstien
that was easy to find out how this thing works  just right click on the 
button makro
ther you find a predefined text that contains the maros use by the programm
glad that i could help
dg9bfc
siegfried or in short form ... sigi
  - Original Message - 
  From: kh6ty 
  To: digitalradio@yahoogroups.com 
  Cc: d...@polar-electric.com 
  Sent: Tuesday, January 13, 2009 7:53 PM
  Subject: Re: [digitalradio] Re: MFTTY 3.0.143 is out


  Thanks Seigfried! That works now. I could not find where that was in the 
  Help.

  Now, if Norbert can only code a double-click to enter the call in Box2, that 
  would be great. I know that it is possible under VB6 as I always code it 
  that way in my own VB PSK31 programs. For example, I code according to the 
  following double-click rules (double-clicking in Windows usually 
  automatically selects a word, as I remember.):

  1. If the word contains three consecutive numbers, it goes into the RST 
  field.

  2. If the word contains one or two numbers, it goes into the callsign 
  field.

  3. If the word has no numbers, it goes into the operator name field.

  4. For QTH, I select all the words and use a right-click context menu to 
  enter the text into the QTH field.

  I do not attempt to distinguish between something like PSK31 and a 
  callsign, but rely on the human brain to make the distinction by where the 
  operator makes the double-click selection.

  73, Skip KH6TY

  - Original Message - 
  From: Siegfried Jackstien siegfried.jackst...@freenet.de
  To: digitalradio@yahoogroups.com
  Sent: Tuesday, January 13, 2009 12:07 PM
  Subject: Re: [digitalradio] Re: MFTTY 3.0.143 is out

  the macro-name for box1 is Name ... for box2 it is Call
  that should solve the problem
  greetz
  dg9bfc
  - Original Message - 
  From: kh6ty
  To: digitalradio@yahoogroups.com
  Sent: Tuesday, January 13, 2009 5:05 PM
  Subject: Re: [digitalradio] Re: MFTTY 3.0.143 is out

   I think we just need to adopt a reasonable protocol for the tone use and
   also allow for manual insertion as needed.
  
   Howard W6IDS
   Richmond, IN
  

  Howard, for manual Pilot insertion, just configure a macro as only Pilot
  and click that to insert a Pilot whenever you want.

  What I think FMTTY needs more than anything is the ability to double-click
  on a callsign and use it for the macros, such as CALL (for the other
  station's callsign). I cannot seem to get the TxMacro boxes to work. When 
  I
  configure a macro with Box1 and put a callsign in for Box 1, I still get
  Box1 transmitting instead of the callsign. The macros also need to be
  linked to function keys for ease of keyboarding use. There really is not
  enough time to fill in the TxMacro box for every QSO. You have to capture 
  a
  callsign as quickly as possible in order to keep from losing a contact. A
  double-click has proven to be the fastest way to do that.

  For example, the significant default DigiPan macros which many are 
  familiar
  with are:

  F2 CQ
  F3 Call 3 (transmit, 3x3, 3x3, 3x3, receive)
  F4 Call (transmit, 1x1)
  F5 BTU (1x1, receive)
  F6 Signoff (73, 1x1, SK, receive)

  This way, the new user only has to press F2 to call CQ, F3 to answer a CQ,
  and then just alternate between F4 and F5 for the QSO. When finished, he
  just goes to the next function key in line to signoff.

  Of course preferences of others may vary!

  73, Skip KH6TY

  Internal Virus Database is out of date.
  Checked by AVG - http://www.avg.com
  Version: 8.0.138 / Virus Database: 270.9.2/1785 - Release Date: 11/13/2008 
  9:12 AM



   

Re: [digitalradio] Re: Digital Modes Presentation (Need Help)

2009-01-13 Thread T Hermann
Misko- 
I'd be happy to send it to you via e-mail.  However, it is not a technical 
presentation at all.  It is merely an introduction to the basic sound card 
based digital modes (MT63, MFSK16, PSK31, Hell, RTTY, Analog SSTV, sound card 
CW and Olivia).  I don't have any information on modes that require TNC's.  It 
is designed as a primer for those who no little to nothing about digital modes 
but might be interested in giving them a try.  Let me know if you still are 
interested and I'll send it your way.  73- Tom AB8IT

--- On Tue, 1/13/09, Miroslav Skoric sko...@ptt.yu wrote:
From: Miroslav Skoric sko...@ptt.yu
Subject: Re: [digitalradio] Re: Digital Modes Presentation (Need Help)
To: digitalradio@yahoogroups.com
Date: Tuesday, January 13, 2009, 1:39 AM











ab8it wrote:



 I have a presentation that I have used at several ham clubs you could

 borrow from or use.  It is a powerpoint and I could e-mail it to you

 if you like. Tom- AB8IT

 



Tom, I'd like to have it too. If you don't mind I would give you a

credit when I discuss about ham radio at scientific conferences.



Misko YT7MPB



PS: Is there available a short audiovisual sequence of an AX.25 packet

signals for download? I'd like to present to the conference audience

something like packet audio burst being received and have it decoded on

the computer screen (or a short keyboard-to- keyboard conversation

between tho ham packet users, or so), but in my area there are no

reliable correspondents anymore to make a recording of that.




  




 

















  

Re: [digitalradio] Re: Digital Modes Presentation (Need Help)

2009-01-13 Thread Raymond Lunsford
Im interested so can you send it to me?k4...@arrl.net.

On Tue, Jan 13, 2009 at 7:26 PM, T Hermann ab...@yahoo.com wrote:
 Misko-
 I'd be happy to send it to you via e-mail.  However, it is not a technical
 presentation at all.  It is merely an introduction to the basic sound card
 based digital modes (MT63, MFSK16, PSK31, Hell, RTTY, Analog SSTV, sound
 card CW and Olivia).  I don't have any information on modes that require
 TNC's.  It is designed as a primer for those who no little to nothing about
 digital modes but might be interested in giving them a try.  Let me know if
 you still are interested and I'll send it your way.  73- Tom AB8IT

 --- On Tue, 1/13/09, Miroslav Skoric sko...@ptt.yu wrote:

 From: Miroslav Skoric sko...@ptt.yu
 Subject: Re: [digitalradio] Re: Digital Modes Presentation (Need Help)
 To: digitalradio@yahoogroups.com
 Date: Tuesday, January 13, 2009, 1:39 AM

 ab8it wrote:

 I have a presentation that I have used at several ham clubs you could
 borrow from or use. It is a powerpoint and I could e-mail it to you
 if you like. Tom- AB8IT


 Tom, I'd like to have it too. If you don't mind I would give you a
 credit when I discuss about ham radio at scientific conferences.

 Misko YT7MPB

 PS: Is there available a short audiovisual sequence of an AX.25 packet
 signals for download? I'd like to present to the conference audience
 something like packet audio burst being received and have it decoded on
 the computer screen (or a short keyboard-to- keyboard conversation
 between tho ham packet users, or so), but in my area there are no
 reliable correspondents anymore to make a recording of that.