Re: [digitalradio] FIR Filters

[Simon Brown]

Hi Sergio,

I am able to design using Parks-McClellan and to be honest I think my UI is 
better than ScopeFIR's.

What I would like (but not essential) is the ability to take my filter 
coefficients and validate them with another program. I don't see this in 
ScopeFIR, although I could possible write my own code to do what I want I 
need to validate my filters with a program not created by my own fair hands 
:-)

With a filter covering 0 to 4,000Hz I simply feed a signal in, see what I 
get out and do some sums...

Simon Brown, HB9DRV

- Original Message - 
From: <[EMAIL PROTECTED]>
>
> I have tried ScopeFIR so far.
> 

[digitalradio] Re: CQ narrow SSTV 10134 tonight

[Brad]

--- In digitalradio@yahoogroups.com, "Andrew O'Brien"
<[EMAIL PROTECTED]> wrote:
>
> I will CQ periodically tonight on 10134 USB running MMSSTV MP73-N
> narrow mode.  Until 04 UTC, probably at 15, 30, 45 and 00 minutes.
> 
> Andy K3UK
>

My sstv web page is monitoring 10132kHz USB, and capable of MP73-N.

30m is predicted to be open from East Coast Australia to East Coast
USA around now (0900z) and for the next few hours. You may have to be
an early riser. Apart from some minor Asian pirate activity, the
frequency is clear.

Brad VK2QQ.com

Re: [digitalradio] Re: CQ narrow SSTV 10134 tonight

[Andrew O'Brien]

No one came back to me, I will try again Monday evening (North America)

Andy


On Jan 21, 2008 5:44 AM, Brad <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
>
> --- In digitalradio@yahoogroups.com, "Andrew O'Brien"
>
>  <[EMAIL PROTECTED]> wrote:
>  >
>  > I will CQ periodically tonight on 10134 USB running MMSSTV MP73-N
>  > narrow mode. Until 04 UTC, probably at 15, 30, 45 and 00 minutes.
>  >
>  > Andy K3UK
>  >
>
>  My sstv web page is monitoring 10132kHz USB, and capable of MP73-N.
>
>  30m is predicted to be open from East Coast Australia to East Coast
>  USA around now (0900z) and for the next few hours. You may have to be
>  an early riser. Apart from some minor Asian pirate activity, the
>  frequency is clear.
>
>  Brad VK2QQ.com
>
>  



-- 
Andy K3UK
www.obriensweb.com
(QSL via N2RJ)

Re: [digitalradio] RFI Identification

[W4LDE-Ron]

Tom,

Where are you located since I have heard the same noise, it comes and 
goes, QTH is central Florida.  Next time I hear it I will start turning 
the beam and see what I see as the direction of the noise.  Most of the 
time it seems to shift in frequency where I hear it which would probably 
indicate that its skip and not local.

Ron W4LDE

Tony wrote:
> Howard,
>
>   
>> I use a portable shortwave broadcast radio to find noise sources
>> 
>
> Good advise - I plan on doing that. See attached picture and audio 
> files.
>
> Thanks,
>
> Tony -K2MO
>
>
> - Original Message - 
> From: "Howard Brown" <[EMAIL PROTECTED]>
> To: 
> Sent: Sunday, January 20, 2008 8:07 PM
> Subject: Re: [digitalradio] RFI Identification
>
>
>   
>> Hello Tony,
>>
>> I use a portable shortwave broadcast radio to find noise sources.  I 
>> just walk around to where it gets stronger, then fades.  I have found 
>> leaky insulators on power poles, etc.  Good Luck.
>>
>> Howard K5HB
>>
>> - Original Message 
>> From: Tony <[EMAIL PROTECTED]>
>> To: digitalradio@yahoogroups.com
>> Sent: Sunday, January 20, 2008 6:59:02 PM
>> Subject: [digitalradio] RFI Identification
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>All,
>>
>>
>>
>> I have an RFI problem that I'm trying to identify. It's a continuous
>>
>> pulse noise that pops on every 1/2 second. The timing between each 
>> pulse
>>
>> is perfect (about 0.533 seconds) and doesn't seem to change.
>>
>>
>>
>> The noise is spread accross all HF bands and on some days it seems to
>>
>> creep up into the 100MHz range; it's also stronger on the lower
>>
>> frequencies. The signal is directional and goes from almost nothing to
>>
>> S-8 with the antennas pointed south.
>>
>>
>>
>> The noise appeard suddenly in December and has not stopped. I have a
>>
>> recording and would appreciate any suggestions.
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Tony -K2MO
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> 
>>
>>
>>
>> 
>>
>>
>>
>> 
>>
>>
>>
>>
>>
>>
>> 
>
>
> Announce your digital presence via our Interactive Sked Page at
> http://www.obriensweb.com/sked
>
>
> DRCC contest info : http://www.obriensweb.com/drcc.htm
>  
> Yahoo! Groups Links
>
>
>
>   
>
> 
>

Re: [digitalradio] Re: CQ narrow SSTV 10134 tonight

[Joe Veldhuis]

I was trying to call you but the band was dead between us. You should try it 
around 5 PM EST.

-Joe, N8FQ

On Mon, 21 Jan 2008 07:29:12 -0500
"Andrew O'Brien" <[EMAIL PROTECTED]> wrote:

> No one came back to me, I will try again Monday evening (North America)
> 
> Andy

Re: [digitalradio] Re: CQ narrow SSTV 10134 tonight

[Russell Blair]

Andy I heard some SSTV today but the band is not open
yet, I'm on 10134.00. Now I have about 1000 ICON's in
a file I would like to convert them so I can use them
as pictures to send over MMSSTV, need some help how do
I get them in that format.
All new to me this SSTV, as an old SSB contester we
stayed away from the SSTV frequencies.

 
Russell NC5O
--- Andrew O'Brien <[EMAIL PROTECTED]> wrote:

> No one came back to me, I will try again Monday
> evening (North America)
> 
> Andy
> 
> 
> On Jan 21, 2008 5:44 AM, Brad <[EMAIL PROTECTED]>
> wrote:
> >
> >
> >
> >
> >
> >
> > --- In digitalradio@yahoogroups.com, "Andrew
> O'Brien"
> >
> >  <[EMAIL PROTECTED]> wrote:
> >  >
> >  > I will CQ periodically tonight on 10134 USB
> running MMSSTV MP73-N
> >  > narrow mode. Until 04 UTC, probably at 15, 30,
> 45 and 00 minutes.
> >  >
> >  > Andy K3UK
> >  >
> >
> >  My sstv web page is monitoring 10132kHz USB, and
> capable of MP73-N.
> >
> >  30m is predicted to be open from East Coast
> Australia to East Coast
> >  USA around now (0900z) and for the next few
> hours. You may have to be
> >  an early riser. Apart from some minor Asian
> pirate activity, the
> >  frequency is clear.
> >
> >  Brad VK2QQ.com
> >
> >  
> 
> 
> 
> -- 
> Andy K3UK
> www.obriensweb.com
> (QSL via N2RJ)
> 


= 
IN GOD WE TRUST ! 
= 
Russell Blair NC5O
  Skype-Russell Blair 
Hell Field #300
  DRCC #55



  

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Find them fast with Yahoo! Search.  
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[digitalradio] RFSM8000 Beacon

[John Bradley]

VE5GPM beaconing on 14103.0 Mil Std Modulation, interval 60 seconds

 

beacon started at 1630Z . please try a connect, or signal reports to
[EMAIL PROTECTED] , put VE5MU as the first word in the "subject"

line.

 

Thanks

 

John

VE5MU

Re: [digitalradio] FIR Filters

[John B. Stephensen]

Since the filter coefficients are the impulse response, you should be able to 
do a DFT of the coefficients to get the frequency response. 

73,

John
KD6OZH

  - Original Message - 
  From: Simon Brown 
  To: [EMAIL PROTECTED] 
  Cc: digitalradio@yahoogroups.com 
  Sent: Monday, January 21, 2008 08:46 UTC
  Subject: Re: [digitalradio] FIR Filters


  Hi Sergio,

  I am able to design using Parks-McClellan and to be honest I think my UI is 
  better than ScopeFIR's.

  What I would like (but not essential) is the ability to take my filter 
  coefficients and validate them with another program. I don't see this in 
  ScopeFIR, although I could possible write my own code to do what I want I 
  need to validate my filters with a program not created by my own fair hands 
  :-)

  With a filter covering 0 to 4,000Hz I simply feed a signal in, see what I 
  get out and do some sums...

  Simon Brown, HB9DRV

  - Original Message - 
  From: <[EMAIL PROTECTED]>
  >
  > I have tried ScopeFIR so far.
  > 


   

Re: [digitalradio] FIR Filters

[Simon Brown]

Hi,

This is not a problem, but I would like to feed my data into a 3-rd party 
program to prove my design, that's all :-)

Simon Brown, HB9DRV
  - Original Message - 
  From: John B. Stephensen 
   
  Since the filter coefficients are the impulse response, you should be able to 
do a DFT of the coefficients to get the frequency response. 

Re: [digitalradio] FIR Filters

[Leigh L Klotz, Jr.]

Simon,
You can use znudigi to do this.  See 
http://wa5znu.org/2008/znudigi-rpsk

You will need to recompile it, but it is in Java and the source is 
provided.  The FIRFilter is there, and the designer is separated out.

Leigh/WA5ZNU
On Mon, 21 Jan 2008 12:46 am, Simon Brown wrote:
> Hi Sergio,
>
> I am able to design using Parks-McClellan and to be honest I think my 
> UI is
> better than ScopeFIR's.
>
> What I would like (but not essential) is the ability to take my filter
> coefficients and validate them with another program. I don't see this 
> in
> ScopeFIR, although I could possible write my own code to do what I want 
> I
> need to validate my filters with a program not created by my own fair 
> hands
> :-)
>
> With a filter covering 0 to 4,000Hz I simply feed a signal in, see what 
> I
> get out and do some sums...
>
> Simon Brown, HB9DRV
>
> - Original Message -
> From: <[EMAIL PROTECTED]>
>>
>>  I have tried ScopeFIR so far.
>>
>
>
> Announce your digital presence via our Interactive Sked Page at
> http://www.obriensweb.com/sked
>
>
> DRCC contest info : http://www.obriensweb.com/drcc.htm
>
> Yahoo! Groups Links
>
>
>

Re: [digitalradio] FIR Filters

[John B. Stephensen]

A third party DFT implementation should prove that the coefficients aren't 
completely incorrect. Beyond that, wouldn't it be more useful to feed the 
filter design parameters into another implementation of the Remez exchange 
algorithm and compare the results?

73,

John
KD6OZH

  - Original Message - 
  From: Simon Brown 
  To: digitalradio@yahoogroups.com ; [EMAIL PROTECTED] 
  Cc: digitalradio@yahoogroups.com 
  Sent: Monday, January 21, 2008 17:58 UTC
  Subject: Re: [digitalradio] FIR Filters


   

  Hi,

  This is not a problem, but I would like to feed my data into a 3-rd party 
program to prove my design, that's all :-)

  Simon Brown, HB9DRV
- Original Message - 
From: John B. Stephensen 
 
Since the filter coefficients are the impulse response, you should be able 
to do a DFT of the coefficients to get the frequency response. 

   

Re: [digitalradio] FIR Filters

[Simon Brown]

Points taken John, but if I do all the coding then I will not find any errors I 
think.

I'll know soon whether my design is correct - it's really a question of using 
correct Nyquist adjusted frequencies etc.

Simon Brown, HB9DRV
  - Original Message - 
  From: John B. Stephensen 
  To: digitalradio@yahoogroups.com ; [EMAIL PROTECTED] 
  Cc: digitalradio@yahoogroups.com 
  Sent: Monday, January 21, 2008 7:12 PM
  Subject: Re: [digitalradio] FIR Filters


   
  A third party DFT implementation should prove that the coefficients aren't 
completely incorrect. Beyond that, wouldn't it be more useful to feed the 
filter design parameters into another implementation of the Remez exchange 
algorithm and compare the results?

  73,

  John
  KD6OZH

- Original Message - 
From: Simon Brown 
To: digitalradio@yahoogroups.com ; [EMAIL PROTECTED] 
Cc: digitalradio@yahoogroups.com 
Sent: Monday, January 21, 2008 17:58 UTC
Subject: Re: [digitalradio] FIR Filters


 

Hi,

This is not a problem, but I would like to feed my data into a 3-rd party 
program to prove my design, that's all :-)

Simon Brown, HB9DRV
  - Original Message - 
  From: John B. Stephensen 
   
  Since the filter coefficients are the impulse response, you should be 
able to do a DFT of the coefficients to get the frequency response. 

   

Re: [digitalradio] FIR Filters

[John B. Stephensen]

OK. I have the MDS product (QEDesign 1000) and could compare the coefficients 
generated if that helps.

73,

John
KD6OZH

  - Original Message - 
  From: Simon Brown 
  To: digitalradio@yahoogroups.com 
  Sent: Monday, January 21, 2008 18:21 UTC
  Subject: Re: [digitalradio] FIR Filters


   

  Points taken John, but if I do all the coding then I will not find any errors 
I think.

  I'll know soon whether my design is correct - it's really a question of using 
correct Nyquist adjusted frequencies etc.

  Simon Brown, HB9DRV
- Original Message - 
From: John B. Stephensen 
To: digitalradio@yahoogroups.com ; [EMAIL PROTECTED] 
Cc: digitalradio@yahoogroups.com 
Sent: Monday, January 21, 2008 7:12 PM
Subject: Re: [digitalradio] FIR Filters


 
A third party DFT implementation should prove that the coefficients aren't 
completely incorrect. Beyond that, wouldn't it be more useful to feed the 
filter design parameters into another implementation of the Remez exchange 
algorithm and compare the results?

73,

John
KD6OZH

  - Original Message - 
  From: Simon Brown 
  To: digitalradio@yahoogroups.com ; [EMAIL PROTECTED] 
  Cc: digitalradio@yahoogroups.com 
  Sent: Monday, January 21, 2008 17:58 UTC
  Subject: Re: [digitalradio] FIR Filters


   

  Hi,

  This is not a problem, but I would like to feed my data into a 3-rd party 
program to prove my design, that's all :-)

  Simon Brown, HB9DRV
- Original Message - 
From: John B. Stephensen 
 
Since the filter coefficients are the impulse response, you should be 
able to do a DFT of the coefficients to get the frequency response. 


   

Re: [digitalradio] Re: Redefining SSTV operations

[Patrick Lindecker]

Hello Leigh,

>RSID is now available in open source C++ pocketdigi so I suspect it will 
RSID define modes and has a limited number of combinations available. Here you 
would need perhaps 24 bits to define all the information needed. So a more 
classical (hard decision instead of soft decision) and a bigger RS coding would 
be necessary, which is not a big problem but days are too short...

73
Patrick


  - Original Message - 
  From: Leigh L Klotz, Jr. 
  To: digitalradio@yahoogroups.com 
  Sent: Monday, January 21, 2008 5:49 AM
  Subject: Re: [digitalradio] Re: Redefining SSTV operations


  Patrick,
  The advantage of the MFSK analog picture mode is that it is already 
  widely implemented, and almost all implementors of MFSK have it. Your 
  RSID is now available in open source C++ pocketdigi so I suspect it will 
  be incorporated into more programs as well. Put the two together and 
  the mode will be widely available fairly soon.
  73,
  Leigh/WA5ZNU
  On Sun, 20 Jan 2008 3:14 pm, Patrick Lindecker wrote:
  > Sholto,
  >
  >> Patrick, I just assumed that a digital SSTV mode in 500Hz that could 
  >> send a
  >
  >> decent size picture in a reasonable amount of time was impossible.
  >
  > With a standard modulation and a standard compression scheme you are 
  > perfectly right, but, perhaps, with some modulation as the one used by 
  > Cesco for FDMDV and a very powerful compression scheme, it's perhaps 
  > possible. A big challenge in all cases.
  >
  >> Then error correction could also be applied...
  >
  > Yes, it would be ideal.
  >
  > 73
  >
  > Patrick
  >
  >> - Original Message -
  >>
  >> From: Sholto Fisher
  >>
  >> To: digitalradio@yahoogroups.com
  >>
  >> Sent: Sunday, January 20, 2008 11:56 PM
  >>
  >> Subject: Re: [digitalradio] Re: Redefining SSTV operations
  >>
  >> Patrick, I just assumed that a digital SSTV mode in 500Hz that could 
  >> send a
  >> decent size picture in a reasonable amount of time was impossible. 
  >> Certainly
  >> if it is possible then it would make more sense to look at that 
  >> approach.
  >> Then error correction could also be applied...
  >>
  >> 73, Sholto KE7HPV.
  >>
  >> - Original Message -
  >> From: "Patrick Lindecker" <[EMAIL PROTECTED]>
  >> To: 
  >> Sent: Sunday, January 20, 2008 2:50 PM
  >> Subject: Re: [digitalradio] Re: Redefining SSTV operations
  >>
  >> Hello Sholto,
  >>
  >> MFSK SSTV is an analogical SSTV mode with the originality that it is a
  >> narrow band SSTV mode (the same as MFSK) and the format of the picture 
  >> is
  >> free (small or big as you want).
  >>
  >> It would be possible to put some RS prefix (with more bits available 
  >> than
  >> for RS ID) to define the center frequency, format and color. But I'm 
  >> not
  >> sure that the gain would be important as this type of SSTV is an "old"
  >> technology. Better would be a Digital SSTV within 500 Hz and as fast as
  >> standard SSTV.
  >>
  >> 73
  >> Patrick
  >
  > 


   

[digitalradio] Re: Redefining SSTV operations

[wd4kpd]

regarding those narrow modes in mmsstvhow do i access 
themdoesnt seem to be any access menu ?

david/wd4kpd

Re: [digitalradio] Re: Redefining SSTV operations

[AA0OI]

Hi David:
right click the modes and you will get new modes.
 
Garrett / AA0OI



- Original Message 
From: wd4kpd <[EMAIL PROTECTED]>
To: digitalradio@yahoogroups.com
Sent: Monday, January 21, 2008 1:11:31 PM
Subject: [digitalradio] Re: Redefining SSTV operations

regarding those narrow modes in mmsstvhow do i access 
themdoesnt seem to be any access menu ?

david/wd4kpd





  

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Re: [digitalradio] Re: Redefining SSTV operations

[Leigh L Klotz, Jr.]

Right, ypu need the size, not just the fact that it is the mode.  
However, if you just use the MFSK code and then send the size info in 
MFSK, it would be 100% compatible with existing implementations.  So, it 
is mostly a UI thing, allowing people in Olivia or some other mode of 
about the same bandwidth to initiate an MFSK picture transmission 
without the cognitive overhead of switching to MFSK.  PSK users probably 
wouldn't want to do this unless there is enough clear bandwidth 
available.

73,
Leigh/WA5ZNU
On Mon, 21 Jan 2008 10:54 am, Patrick Lindecker wrote:
> Hello Leigh,
>
>> RSID is now available in open source C++ pocketdigi so I suspect it 
>> will
>
> RSID define modes and has a limited number of combinations available. 
> Here you would need perhaps 24 bits to define all the information 
> needed. So a more classical (hard decision instead of soft decision) 
> and a bigger RS coding would be necessary, which is not a big problem 
> but days are too short...
>
> 73
>
> Patrick
>
>> - Original Message -
>>
>> From: Leigh L Klotz, Jr.
>>
>> To: digitalradio@yahoogroups.com
>>
>> Sent: Monday, January 21, 2008 5:49 AM
>>
>> Subject: Re: [digitalradio] Re: Redefining SSTV operations
>>
>> Patrick,
>>
>> The advantage of the MFSK analog picture mode is that it is already
>> widely implemented, and almost all implementors of MFSK have it. Your
>> RSID is now available in open source C++ pocketdigi so I suspect it 
>> will
>> be incorporated into more programs as well. Put the two together and
>> the mode will be widely available fairly soon.
>> 73,
>> Leigh/WA5ZNU
>> On Sun, 20 Jan 2008 3:14 pm, Patrick Lindecker wrote:
>>>  Sholto,
>>>
  Patrick, I just assumed that a digital SSTV mode in 500Hz that could
  send a
>>>
  decent size picture in a reasonable amount of time was impossible.
>>>
>>>  With a standard modulation and a standard compression scheme you are
>>>  perfectly right, but, perhaps, with some modulation as the one used by
>>>  Cesco for FDMDV and a very powerful compression scheme, it's perhaps
>>>  possible. A big challenge in all cases.
>>>
  Then error correction could also be applied...
>>>
>>>  Yes, it would be ideal.
>>>
>>>  73
>>>
>>>  Patrick
>>>
  - Original Message -

  From: Sholto Fisher

  To: digitalradio@yahoogroups.com

  Sent: Sunday, January 20, 2008 11:56 PM

  Subject: Re: [digitalradio] Re: Redefining SSTV operations

  Patrick, I just assumed that a digital SSTV mode in 500Hz that could
  send a
  decent size picture in a reasonable amount of time was impossible.
  Certainly
  if it is possible then it would make more sense to look at that
  approach.
  Then error correction could also be applied...

  73, Sholto KE7HPV.

  - Original Message -
  From: "Patrick Lindecker" <[EMAIL PROTECTED]>
  To: 
  Sent: Sunday, January 20, 2008 2:50 PM
  Subject: Re: [digitalradio] Re: Redefining SSTV operations

  Hello Sholto,

  MFSK SSTV is an analogical SSTV mode with the originality that it is a
  narrow band SSTV mode (the same as MFSK) and the format of the picture
  is
  free (small or big as you want).

  It would be possible to put some RS prefix (with more bits available
  than
  for RS ID) to define the center frequency, format and color. But I'm
  not
  sure that the gain would be important as this type of SSTV is an "old"
  technology. Better would be a Digital SSTV within 500 Hz and as 
 fast as
  standard SSTV.

  73
  Patrick
>>>
>>>
>
> 

[digitalradio] Re: [ARRL-LOTW] First International DominoEx Prefix Contest

[Tooner]

Hello Group.  I searched this forum to see if anyone else had a
question about 'Domino' digital modes and ARRL's Logbook-of-The-World.

All I found was the following request:

> Subject: [ARRL-LOTW] First International DominoEx Prefix Contest
> 
> Any one know what mode designator would be best when uploading
> these QSO's to LoTW?
> 
> 73 John ZL1BYZ.

I sent an email earlier this month to ask ARRL about adding Domino to
LoTW, as it's refused on any upload attempts.

Here's the email I sent:

" Sent: Sunday, January 13, 2008 10:55 PM
To: lotw-help
Subject: k2ncc - domino and LoTW

Greetings,

I see that Domino digital modes are not accepted in LoTW.

Any chance that Domino can be added as a 'DATA' emission mode?  It's
certainly more popular than Clover or FSK441.

A complete search of your site doesn't return anything for Domino,
although at least two of the popular digital-modes software has it as
an option.

Many thanks for your considerations.

73.  Frank K2NCC "



. Here's ARRL's rather generic response:



"from   Fusaro, Norm W3IZ <[EMAIL PROTECTED]>
to  [EMAIL PROTECTED],
dateJan 21, 2008 12:30 PM
subject RE: k2ncc - domino and LoTW
mailed-by   arrl.org

Hi Frank.

Thank you for your suggestion. 

Logbook of The World is a service to verify two way radio contacts
that radio amateurs can use as verification in their pursuit towards
operating awards.  Currently LoTW supports DXCC and WAS. 

The development of new digital modes offers radio amateurs many
options to have exchanges over the airwaves however when it comes to
chasing awards all digital or data modes are treated equally.  This is
similar to the way voice modes are treated in LoTW where AM, FM and
SSB are all the same as far as the award is concerned.

The table of different modes is to accommodate electronic logging
programs and LoTW uses the standard ADIF table.  At the time of LoTW
development some modes had not yet been invented and are missing from
the table. 

If you are having difficulty signing your log because the mode is not
recognized you may have to convert the mode to something generic such
as data.

I hope that this helps you in your pursuit of DXCC.

Thank you for using Logbook of The World.

73,

Norm Fusaro, W3IZ
Assistant Manager,
Membership & Volunteer Programs Department
ARRL - The national association for Amateur Radio"



So, in summary, Domino digital mode QSOs are to be put in our logs as
"DATA" or some other IFK mode like MFSK.  For what it's worth, I don't
think that really represents an accurate log entry.

Here's the list of accepted modes for LoTW:
https://p1k.arrl.org/lotw/faq#modes

Anyone else think this, or other emission types you might use, should
be added to ARRL's Logbook-of-The-World supported modes?

73.  Frank K2NCC

Re: [digitalradio] Re: Redefining SSTV operations

[Jens Petersen]

On Mon, 21 Jan 2008 19:11:31 -, you wrote:

>regarding those narrow modes in mmsstvhow do i access 
>themdoesnt seem to be any access menu ?

Right click on a mode button yuou want to redefine, and a long list of
modes appear. The narrow modes is in the lower end.

-- 
OV1A Jens

Solar Cycle 24 has arrived!

Re: [digitalradio] Re: CQ narrow SSTV 10134 tonight

[Andrew O'Brien]

I am QRV on 10134 USB tonight but can also QSY to other bands tonight
if anyone wants to try a sub-500Hz narrow SSTV QSO.  I may also post a
quick guide on how to do all this.  I will try to CQ at 00, 15, 30,
and 45 minutes past the hour if the frequency is clear.



Andy K3UK



On Jan 21, 2008 9:43 AM, Russell Blair <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
>
> Andy I heard some SSTV today but the band is not open
>  yet, I'm on 10134.00. Now I have about 1000 ICON's in
>  a file I would like to convert them so I can use them
>  as pictures to send over MMSSTV, need some help how do
>  I get them in that format.
>  All new to me this SSTV, as an old SSB contester we
>  stayed away from the SSTV frequencies.
>
>  Russell NC5O
>
>  --- Andrew O'Brien <[EMAIL PROTECTED]> wrote:
>
>  > No one came back to me, I will try again Monday
>  > evening (North America)
>  >
>  > Andy
>  >
>  >
>  > On Jan 21, 2008 5:44 AM, Brad <[EMAIL PROTECTED]>
>  > wrote:
>  > >
>  > >
>  > >
>  > >
>  > >
>  > >
>  > > --- In digitalradio@yahoogroups.com, "Andrew
>  > O'Brien"
>  > >
>  > > <[EMAIL PROTECTED]> wrote:
>  > > >
>  > > > I will CQ periodically tonight on 10134 USB
>  > running MMSSTV MP73-N
>  > > > narrow mode. Until 04 UTC, probably at 15, 30,
>  > 45 and 00 minutes.
>  > > >
>  > > > Andy K3UK
>  > > >
>  > >
>  > > My sstv web page is monitoring 10132kHz USB, and
>  > capable of MP73-N.
>  > >
>  > > 30m is predicted to be open from East Coast
>  > Australia to East Coast
>  > > USA around now (0900z) and for the next few
>  > hours. You may have to be
>  > > an early riser. Apart from some minor Asian
>  > pirate activity, the
>  > > frequency is clear.
>  > >
>  > > Brad VK2QQ.com
>  > >
>  > >
>  >
>  >
>  >
>  > --
>  > Andy K3UK
>  > www.obriensweb.com
>  > (QSL via N2RJ)
>  >
>
>  =
>  IN GOD WE TRUST !
>  =
>  Russell Blair NC5O
>  Skype-Russell Blair
>  Hell Field #300
>  DRCC #55
>
>  __
>  Looking for last minute shopping deals?
>  Find them fast with Yahoo! Search.
> http://tools.search.yahoo.com/newsearch/category.php?category=shopping
>  



-- 
Andy K3UK
www.obriensweb.com
(QSL via N2RJ)

[digitalradio] Re: RF feedback problems

[David Bowman WB0QIR]

--- In digitalradio@yahoogroups.com, "Bill McLaughlin" <[EMAIL PROTECTED]> 
wrote:
>
> Hello David,
> 
> I have not had that exact problem, so others might be able to shed
> more light than I can.
> First thing I would do is check for an open ground or a ground loop.
> Also consider that your ptt "ground" is not necessarily your audio
> "ground".
> Does the problem go away when you transmit into a dummy load and/or at
> reduced power? Does it improve when you drop the audio level into and
> from your interface? Are you in close proximity to your antenna with
> your radio, computer and interface? Does this happen on just one band
> or on all bands? Not familiar with that interface, but is the
> interface audio hot and the mic hot tied together or are you using an
> aux port? Also what does the your signal sound like, other than
> "terrible"? Sorry for so many questions.
> 
> If all else checks out, the ferrite chokes are a fairly inexpensive
> fix, if indeed it is your cable that is picking up the RF.
> 
> 73,
> 
> Bill N9DSJ
> 
> 
> --- In digitalradio@yahoogroups.com, "David Bowman  WB0QIR"
>  wrote:
> >
> > I have a Kenwood TS-680S rig and am using a psk31/rtty soundcard
> > interface from Associated Radio.  Whenever The db9 data cable from the
> > interface is plugged into a computer my signal is terrible when I
> > transmit data or use the microphone.  Unhooking the microphone does
> > not help.  Before I buy some ferrite chokes I wanted to see if anyone
> > has any other ideas of how or what the problem may be and how to
fix it.
> >
>
I have used the serial cable from my rig to my tnc with no problems. 
The person who has monitored my signal can't hear me with my dummy
load.  The PSK-31 cable that I got from Associated Radio is sealed and
 I can't tell how the interface box or DB9 looks like.  Unhooking the
microphone does no good.  When I unhook the interface cable while
talking thru the microphone the interference goes away immediately and
vice verse.  It doesn't matter which end I disconnect.  I have no
problems with the microphone and speaker lines from the interface.  I
have tried wrapping the cable in aluminum foil.  I am using 450 ohm
ladder line to my mfj deluxe tuner which probably doesn't help it
much.  I pulled my ground from my ground rod and if there is a ground
now it would be thru my house service.  My tuner, rig and computer are
within 3 ft of each other. I have not heard my signal but have been
told by more than one person that is has rf on it.  I could get a
recording of it if needed. I don't feel that this problem just
started, I just haven't used the cable to transmit.  I have a picture
frame shaped ferrite of about 1 in square that I tried but it didn't
help.  I have a cube shaped screwdriver magnetizer that I just thought
of trying with the other ferrite.  I have not yet tried the beer can
that KC7CJO suggested.  Thanks to both of you for responding. 

Re: [digitalradio] FIR Filters

[Leigh L Klotz, Jr.]

I think maybe what you want is MATLAB.

It has its own Parks-McClellan designer, firpm.  It also has an 
estimator for required order, given band edges and desired amplitudes.   
You can then trivially plot the h(n), error, etc from within Matlab.  I 
don't know if the free clones of Matlab (Scllab, and to a lesser extent 
Octave) have the libraries you would want but it is worth a look.

Leigh/WA5ZNU
On Mon, 21 Jan 2008 12:46 am, Simon Brown wrote:
> Hi Sergio,
>
> I am able to design using Parks-McClellan and to be honest I think my 
> UI is
> better than ScopeFIR's.
>
> What I would like (but not essential) is the ability to take my filter
> coefficients and validate them with another program. I don't see this 
> in
> ScopeFIR, although I could possible write my own code to do what I want 
> I
> need to validate my filters with a program not created by my own fair 
> hands
> :-)
>
> With a filter covering 0 to 4,000Hz I simply feed a signal in, see what 
> I
> get out and do some sums...
>
> Simon Brown, HB9DRV
>
> - Original Message -
> From: <[EMAIL PROTECTED]>
>>
>>  I have tried ScopeFIR so far.
>>
>
>
> Announce your digital presence via our Interactive Sked Page at
> http://www.obriensweb.com/sked
>
>
> DRCC contest info : http://www.obriensweb.com/drcc.htm
>
> Yahoo! Groups Links
>
>
>

[digitalradio] How do we know MP73-N is less than 500 hz ?

[Andrew O'Brien]

When I look at MP73-N in the MMSSTV waterfall while TX button is 
pressed, I see that the vast majority of the spectrum display is within 
500 Hz (1900 to 2300)but I count 16 brief burst where a ripple is noted 
to extend out to about 2600 Hz.  Would this not count as wider than 500 
Hz ?

Andy K3UK

Re: [digitalradio] How do we know MP73-N is less than 500 hz ?

[Sholto Fisher]

Andy,

Looking at http://www33.ocn.ne.jp/~je3hht/mmsstv/mode.txt the sync is at
1900Hz and the tones occupy 2044Hz-2300Hz.
Even with the sync it is only 400Hz or am I missing something?

73, Sholto KE7HPV.



- Original Message - 
From: "Andrew O'Brien" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 21, 2008 5:32 PM
Subject: [digitalradio] How do we know MP73-N is less than 500 hz ?


When I look at MP73-N in the MMSSTV waterfall while TX button is
pressed, I see that the vast majority of the spectrum display is within
500 Hz (1900 to 2300)but I count 16 brief burst where a ripple is noted
to extend out to about 2600 Hz.  Would this not count as wider than 500
Hz ?

Andy K3UK

Re: [digitalradio] How do we know MP73-N is less than 500 hz ?

[Sholto Fisher]

Oh it's probably the FSKID I think


- Original Message - 
From: "Andrew O'Brien" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 21, 2008 5:32 PM
Subject: [digitalradio] How do we know MP73-N is less than 500 hz ?


When I look at MP73-N in the MMSSTV waterfall while TX button is 
pressed, I see that the vast majority of the spectrum display is within 
500 Hz (1900 to 2300)but I count 16 brief burst where a ripple is noted 
to extend out to about 2600 Hz.  Would this not count as wider than 500 
Hz ?

Andy K3UK

[digitalradio] Re: How do we know MP73-N is less than 500 hz ?

[Andrew O'Brien]

-I see the FSKID, I think it starts at the same time the MP73-N 
stops, but may cause an issue.  We can always turn that off, I guess.

-- In digitalradio@yahoogroups.com, "Sholto Fisher" <[EMAIL PROTECTED]> 
wrote:
>
> Oh it's probably the FSKID I think
> 
> 
> - Original Message - 
> From: "Andrew O'Brien" <[EMAIL PROTECTED]>
> To: 
> Sent: Monday, January 21, 2008 5:32 PM
> Subject: [digitalradio] How do we know MP73-N is less than 500 hz ?
> 
> 
> When I look at MP73-N in the MMSSTV waterfall while TX button is 
> pressed, I see that the vast majority of the spectrum display is 
within 
> 500 Hz (1900 to 2300)but I count 16 brief burst where a ripple is 
noted 
> to extend out to about 2600 Hz.  Would this not count as wider than 
500 
> Hz ?
> 
> Andy K3UK
>

Re: [digitalradio] How do we know MP73-N is less than 500 hz ?

[John Becker, WØJAB]

Would there really be a problem if it is wider then
500Hz?

John


At 07:32 PM 1/21/2008, you wrote:
>When I look at MP73-N in the MMSSTV waterfall while TX button is 
>pressed, I see that the vast majority of the spectrum display is within 
>500 Hz (1900 to 2300)but I count 16 brief burst where a ripple is noted 
>to extend out to about 2600 Hz.  Would this not count as wider than 500 
>Hz ?
>
>Andy K3UK

[digitalradio] been thinking about an oscilloscope

[Tooner]

I've been thinking about getting an oscilloscope.  I've got some idea
of what to look for in one when using it with amateur radio, but am
wondering about one I've found several of for under 200 bucks.

It's the "Tektronix 465 dual trace oscilloscope".

Here's the specifications: http://tinyurl.com/2jxwux

Think this will do everything I would want with servicing and
analyzing my old Kenwood hybrid (TS-830S) rig?

Frank, K2NCC

RE: [digitalradio] been thinking about an oscilloscope

[Michael Hatzakis Jr MD]

I had a 465 for years, great scope, loved it.  Had some issues with the
transformer and the display, but was a work-horse.  It is not an expensive
scope.  

 

I later upgraded to a Tek 485 which has a lot higher speed and can be had
for around $200 - $275 on e-bay, which is where I bought mine.  No
comparison, the 465 is 100mhz and the 485 is 400mhz.  Well worth the few
extra $$$.  This way I can also work on my 2 meter and a little bit on my
220mhz projects.  I love them both.  Important to get good probes though and
if you fish around, you can get some for a good deal.  Be sure you are not
confused by the TAS 485 which is a new, solid state scope.  Check e-bay
number 220193548691 and 230213764989

 

Michael  K3MH

 

  _  

From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Tooner
Sent: Monday, January 21, 2008 9:48 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] been thinking about an oscilloscope

 

I've been thinking about getting an oscilloscope. I've got some idea
of what to look for in one when using it with amateur radio, but am
wondering about one I've found several of for under 200 bucks.

It's the "Tektronix 465 dual trace oscilloscope".

Here's the specifications: http://tinyurl. 
com/2jxwux

Think this will do everything I would want with servicing and
analyzing my old Kenwood hybrid (TS-830S) rig?

Frank, K2NCC

 

[digitalradio] Re: been thinking about an oscilloscope

[Tooner]

Thank you for that information Michael!

f

RE: [digitalradio] been thinking about an oscilloscope

[Dave AA6YQ]

That was a nice dual-trace scope in its day, but tops out at 10 mhz. What's
the TS-830S IF frequency (or frequencies)?

73,

Dave, AA6YQ

-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Behalf Of Tooner
Sent: Tuesday, January 22, 2008 12:48 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] been thinking about an oscilloscope


I've been thinking about getting an oscilloscope. I've got some idea
of what to look for in one when using it with amateur radio, but am
wondering about one I've found several of for under 200 bucks.

It's the "Tektronix 465 dual trace oscilloscope".

Here's the specifications: http://tinyurl.com/2jxwux

Think this will do everything I would want with servicing and
analyzing my old Kenwood hybrid (TS-830S) rig?

Frank, K2NCC

RE: [digitalradio] been thinking about an oscilloscope

[Dave AA6YQ]

Sorry, bad memory -- its a 100 mhz scope as the previous poster pointed out.

It was the KnightKit scope I built when I was 12 that was 10 mhz...

73,

Dave, AA6YQ


-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Behalf Of Dave AA6YQ
Sent: Tuesday, January 22, 2008 1:43 AM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] been thinking about an oscilloscope



That was a nice dual-trace scope in its day, but tops out at 10 mhz. What's
the TS-830S IF frequency (or frequencies)?

73,

Dave, AA6YQ

-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Behalf Of Tooner
Sent: Tuesday, January 22, 2008 12:48 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] been thinking about an oscilloscope


I've been thinking about getting an oscilloscope. I've got some idea
of what to look for in one when using it with amateur radio, but am
wondering about one I've found several of for under 200 bucks.

It's the "Tektronix 465 dual trace oscilloscope".

Here's the specifications: http://tinyurl.com/2jxwux

Think this will do everything I would want with servicing and
analyzing my old Kenwood hybrid (TS-830S) rig?

Frank, K2NCC

Re: [digitalradio] been thinking about an oscilloscope

[Sholto Fisher]

I bought a Tektronix 2225 dual 50 MHz on eBay for $100 couple years back.
Works fine for HF.

73, Sholto KE7HPV.


- Original Message - 
From: "Tooner" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 21, 2008 9:47 PM
Subject: [digitalradio] been thinking about an oscilloscope


I've been thinking about getting an oscilloscope.  I've got some idea
of what to look for in one when using it with amateur radio, but am
wondering about one I've found several of for under 200 bucks.

It's the "Tektronix 465 dual trace oscilloscope".

Here's the specifications: http://tinyurl.com/2jxwux

Think this will do everything I would want with servicing and
analyzing my old Kenwood hybrid (TS-830S) rig?

Frank, K2NCC

[digitalradio] Re: been thinking about an oscilloscope

[Tooner]

What's the difference between an oscilloscope and a spectrum analyzer?
 I use software spectrum analyzers, but still have ambient baseline
noise since it's input is via a soundcard.  Can I get the same
benefits with an oscilloscope that I get with spectrum analyzer?  I'd
like to be able to evaluate digital waveforms I pluck from the air as
well as have a tool to work on the rigs.  Any suggestions if they're
not interchangeable for these needs?

Frank, K2NCC