Re: [digitalradio] CMSK

[Patrick VK2PN]

 Hi guys,

I've installed it on two laptops and got them talking across the room.  
Anybody is willing to play "real" in near future??


Best may be 20 m and US early evening.

BTW the condx are very good right now.

73
Patrick VK2PN

On 10/08/2010 13:25, Andy obrien wrote:


Thanks Sholto, going to give it a try

Andy

On Mon, Aug 9, 2010 at 6:38 PM, sholtofish > wrote:


Interesting new software from Con

New narrow-band mode for LF/MF released

Con Wassilieff ZL2AFP has recently released a new narrow-band
digital mode, CMSK, designed specifically for the LF and MF ham
radio bands (2200, 600 and 160m).


SNIP

--
~~
Patrick
VK2PN
WCC #31
EPC #10566
NAQCC #4433
FISTS #14119
Sydney
QF56pe

Re: [digitalradio] CMSK

[Andy obrien]

Thanks Sholto, going to give it a try

Andy

On Mon, Aug 9, 2010 at 6:38 PM, sholtofish  wrote:

>
>
> Interesting new software from Con
>
> New narrow-band mode for LF/MF released
>
> Con Wassilieff ZL2AFP has recently released a new narrow-band digital mode,
> CMSK, designed specifically for the LF and MF ham radio bands (2200, 600 and
> 160m).
>
> The mode uses MSK modulation, familiar to LF and MF listeners as the mode
> most used by commercial and military transmissions. One major advantage of
> MSK is that unlike PSK, it does not require linear amplification to maintain
> narrow bandwidth.
>
> The new ZL2AFP CMSK mode can be described as Correlated, Convolved Minimum
> Shift Keying, and uses a full-time NASA standard convolutional coder with a
> generous interleaver to provide impressive QRN resistance.
>
> Synchronism is assured, even on very weak signals, by a transmitted
> PN-sequence frame marker and cross-correlator at the receiver.
>
> Four modes have been provided, from 125 baud (<200Hz bandwidth, 60 WPM)
> down to 7.8 baud (12.5Hz bandwidth, 4WPM). The narrowest and slowest mode is
> intended for beacon applications, and can be received 100% at -21dB S/N in
> 3kHz bandwidth. The default mode, CMSK63, has been reliably copied across
> the Tasman, at a range of 2200km on 600m from a transmission well under 1W
> EIRP.
>
> Software for this new mode is now available from
> www.qsl.net/zl1bpu/CMSK/cmsk.htm, where a description of the design is
> also given.
>
> Murray Greenman ZL1BPU/ZL1EE
>
>  
>

[digitalradio] SpectraVue 3.09

[Andy obrien]

-- Forwarded message --
From: moe_wheatley




New Version 3.09 Spectravue. Nothing major, mostly new support for next
generation RFSPACE radios and a few bug fixes.

One new feature that may be of interest to all is an "AutoStart" feature so
SV starts automatically when first brought up. It is enabled in the General
Setup menu.

Also for Kenwood radio owners, there is a detailed procedure in the help
file to modify the SDR-IQ radio to loop back the RS232 handshake lines
without having to modify a cable.

Moe

 _

[digitalradio] CMSK

[sholtofish]

Interesting new software from Con

 New narrow-band mode for LF/MF released

Con Wassilieff ZL2AFP has recently released a new narrow-band digital mode, 
CMSK, designed specifically for the LF and MF ham radio bands (2200, 600 and 
160m).

The mode uses MSK modulation, familiar to LF and MF listeners as the mode most 
used by commercial and military transmissions. One major advantage of MSK is 
that unlike PSK, it does not require linear amplification to maintain narrow 
bandwidth.

The new ZL2AFP CMSK mode can be described as Correlated, Convolved Minimum 
Shift Keying, and uses a full-time NASA standard convolutional coder with a 
generous interleaver to provide impressive QRN resistance.

Synchronism is assured, even on very weak signals, by a transmitted PN-sequence 
frame marker and cross-correlator at the receiver.

Four modes have been provided, from 125 baud (<200Hz bandwidth, 60 WPM) down to 
7.8 baud (12.5Hz bandwidth, 4WPM). The narrowest and slowest mode is intended 
for beacon applications, and can be received 100% at -21dB S/N in 3kHz 
bandwidth. The default mode, CMSK63, has been reliably copied across the 
Tasman, at a range of 2200km on 600m from a transmission well under 1W EIRP.

Software for this new mode is now available from
www.qsl.net/zl1bpu/CMSK/cmsk.htm, where a description of the design is also 
given.

Murray Greenman ZL1BPU/ZL1EE

Re: [digitalradio] Re: Direct RTTY Generation

[J. Moen]

I know this thread is about a simple QRP project for beginners, but the NUE-PSK 
does support RTTY as well as PSK31.  You could backback with an 817 and the 
modem, though they are nearing completion on an SDR board that apparently could 
be fit into the NUE-PSK enclosure.  Not much to haul around.

Jim - K6JM

- Original Message - 
  From: vsmith269 
  To: digitalradio@yahoogroups.com 
  Sent: Thursday, August 05, 2010 6:55 AM
  Subject: [digitalradio] Re: Direct RTTY Generation

  Interesting idea with enough design challenges to make it fun. Have you given 
any thought to the RX end - decoding the received RTTY?

  I would love to see (and use) a system like this. Backpacking with an RTTY 
setup would be neat.

  --- In digitalradio@yahoogroups.com, "Simon HB9DRV"  wrote:
  >
  > How will you get the shift correct? Doesn't have to be too exact but does
  > have to be +/- 25% or so.
  > 
  > I was thinking about this while walking the dog - for a simple solution a
  > SoftRock v6.3 would maybe a simpler / better hardware solution but you'll
  > need more presky software :)
  > 
  > Simon Brown, HB9DRV
  > http://sdr-radio.com
  > 
  > > -Original Message-
  > > From: digitalradio@yahoogroups.com
  > > 
  > > 
  > > A simple QRP Tx suitable for beginners, for example, is usually the
  > > ubiquitous 1 Watt 40m thing for CW that all the magazines and book
  > > seem include ad-ad-naueam, built into sweet tins or whatever novel box
  > > they can think of. I want to be different, and publish a design for
  > > RTTY. A simple varicap across a crystal, needing a bit of applied
  > > science with SSB Rx and Spectrogram prog to set the shift - all part of
  > > the basic learning process.
  > > 
  > > But to do that needs a way of driving the Tx with a wire that just
  > > waggles 1/0 with RTTY data - just like the mechanical teleprinters of
  > > old. So long as it does it at 45 or 50 baud and is properly timed
  > > (perhaps not so easy using Windoze - could this be why there's nothing
  > > out there?)
  > > 
  > > I wanted to steer away from a design that linearly upconverted from a
  > > soundcard then filtered and amplified the result. The request was
  > > for "simple designs for beginners"
  > >

[digitalradio] re: SCS PTC-II and regular digital modes

[Peter Jordahl]

When I was using a (borrowed) SCS PTC II I used a common
old-style KVM switchbox with 5 5-pin DIN, 5 9-pin D-shell, etc.
The 5 -pin DINS were replaced with 8-pin DIN (still female, of
course) and the extra pins were wired with lines borrowed from
the 9-pin D-shell connectors.  Then with an 8-pin to 8-pin DIN
cable from the 756 Pro II to the "input" side of the KVM box I
could switch to a PK-232, the borrowed PTC II, or the
MicroKeyer.  Prpbably best not to switch "hot", as I don't know
whether the KVM switch is "break before make"., but it does save
fiddling in the back of the radio, which is especially difficult
for me.

The biggest problem encountered was finding the 8-pin female
chassis mount DIN connectors.

I must acknowledge the great help of Milt W8NUE (of NUE-modem
fame) in doing the rewiring.

Pete K5GM
On Sat, 07 Aug 2010 09:12 +, digitalradio@yahoogroups.com
wrote:

[1]Amateur Radio Digital  Mode Discussion

Messages In This Digest (5 Messages)

3a.
   [2]SCS PTC-II and regular digital modes From: g4ilo

3b.
   [3]Re: SCS PTC-II and regular digital modes From: Andy
   obrien

[4]View All Topics | [5]Create New Topic

Messages

3a.

[6]SCS PTC-II and regular digital modes

Posted by: "g4ilo" [7]jul...@g4ilo.com   [8]g4ilo

Fri Aug 6, 2010 2:34 pm (PDT)

   I have been wondering about getting an SCS multimode
   controller, the PTC-II USB. Primarily I am interested in
   getting the best performance for HF APRS which is what my
   radio does most of the time while I am otherwise engaged.
   I have no interest in Winlink but am interested in trying
   Pactor-II which people have said can hold QSOs even under
   very difficult conditions. Is there much activity on the
   mode?
   I don't want to deny myself the opportunity to use PSK31
   or RTTY but the SCS would plug into the rear audio
   connections of my transceiver and I don't want to have to
   grope around the back changing plugs just to use soundcard
   modes. I understand these controllers can do PSK and RTTY
   as well but I don't see how this works with the programs I
   am familiar with.
   I'm also unsure how the transceiver control works. I
   currently have a separate serial cable to my K3 for this.
   If any users of the SCS controllers could pass on their
   experiences to a prospective user I would be extremely
   grateful.
   Julian, G4ILO
   [9]Back to top
   [10]Reply to sender | [11]Reply to group | [12]Reply via
   web post
   [13]Messages in this topic (2)

3b.

[14]Re: SCS PTC-II and regular digital modes

Posted by: "Andy obrien" [15]k3uka...@gmail.com   [16]obrienaj

Fri Aug 6, 2010 3:33 pm (PDT)

   I have the same interest, and would also be interested in
   answers to
   Julian's questions.
   Andy K3UK
   On Fri, Aug 6, 2010 at 5:31 PM, g4ilo <[17]jul...@g4ilo.
   com> wrote:
   >
   >
   > I have been wondering about getting an SCS multimode
   controller, the PTC-II
   > USB. Primarily I am interested in getting the best
   performance for HF APRS
   > which is what my radio does most of the time while I am
   otherwise engaged.
   >
   > I have no interest in Winlink but am interested in
   trying Pactor-II which
   > people have said can hold QSOs even under very difficult
   conditions. Is
   > there much activity on the mode?
   >
   > I don't want to deny myself the opportunity to use PSK31
   or RTTY but the
   > SCS would plug into the rear audio connections of my
   transceiver and I don't
   > want to have to grope around the back changing plugs
   just to use soundcard
   > modes. I understand these controllers can do PSK and
   RTTY as well but I
   > don't see how this works with the programs I am familiar
   with.
   >
   > I'm also unsure how the transceiver control works. I
   currently have a
   > separate serial cable to my K3 for this.
   >
   > If any users of the SCS controllers could pass on their
   experiences to a
   > prospective user I would be extremely grateful.
   >
   > Julian, G4ILO
   >
   > _
   >

   [18]Back to top
   [19]Reply to sender | [20]Reply to group | [21]Reply via
   web post
   [22]Messages in this topic (2)




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[digitalradio] Re: Direct RTTY Generation

[vsmith269]

Interesting idea with enough design challenges to make it fun. Have you given 
any thought to the RX end - decoding the received RTTY?

I would love to see (and use) a system like this. Backpacking with an RTTY 
setup would be neat.



--- In digitalradio@yahoogroups.com, "Simon HB9DRV"  wrote:
>
> How will you get the shift correct? Doesn't have to be too exact but does
> have to be +/- 25% or so.
> 
> I was thinking about this while walking the dog - for a simple solution a
> SoftRock v6.3 would maybe a simpler / better hardware solution but you'll
> need more presky software :)
> 
> Simon Brown, HB9DRV
> http://sdr-radio.com
> 
> > -Original Message-
> > From: digitalradio@yahoogroups.com
> > 
> > 
> > A simple QRP Tx suitable for beginners, for example, is usually the
> > ubiquitous 1 Watt 40m thing for CW that all the magazines and book
> > seem include ad-ad-naueam, built into sweet tins or whatever novel box
> > they can think of.I want to be different, and publish a design for
> > RTTY.  A simple varicap across a crystal, needing a bit of applied
> > science with SSB Rx and Spectrogram prog to set the shift - all part of
> > the basic learning process.
> > 
> > But to do that needs a way of driving the Tx with a wire that just
> > waggles 1/0 with RTTY data - just like the mechanical teleprinters of
> > old.  So long as it does it at 45 or 50 baud and is properly timed
> > (perhaps not so easy using Windoze - could this be why there's nothing
> > out there?)
> > 
> > I wanted to steer away from a design that linearly upconverted from a
> > soundcard then filtered and amplified the result.The request was
> > for "simple designs for beginners"
> >
>