LF: Re: RTTY test transmission

[Minto Witteveen <minto.witteveen@gmail.com>]

Hi Stefan,

 

Yes that was me.. I saw you typing that text and decided to respond.

I will be QRV later tonight if I can get away from other responsibilities (), and an RTTY QSO should be possible, all be it via WebSDR.

No chance of me being heard at your locoation (direct) as my WSPR sigs are way below –20dB at your location, so my logs tell me.

 

73’s Minto pa3bca

 

 

 

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From: Stefan Schäfer

Sent: Tuesday, March 05, 2013 18:06

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: Re: RTTY test transmission

 

Minto,

I'm excited. Was that you a few minutes ago?
I was writing in real time some stuff to my program which sent the stuff in RTTY immediately. The TX was in idle mode during that time. suddenly someone answered! "big brother is watching you" and so. Was that you??
It looks like my PA is blown up once again. It is simply not designed for a key-down transmission, so the idle mode is not ideal, except i'm using a fan. Now i will once again replace 2x IRFZ48N and be on air in 1 hour or earlier. Let us try the QSO then again, OK? :-)

73, Stefan/DK7FC


Am 05.03.2013 17:57, schrieb Minto Witteveen:

Oh my bad. I know Amtor is fsk, but thought that ros-mf is non-lineair like PSK31.

Learning all the time. Is the protocoll open-source so I can understand it and program it in my PIC?

I know, I know... will look it up myself :-)

 

 

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From: Graham

Sent: Tuesday, March 05, 2013 17:49

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: Re: RTTY test transmission

 

Linear  ?  amtor  fec  is  2 tone   fsk  mode  ... ros-mf  is  mfsk  , but needs   sdr or  audio to  Rf translation  , very few  have  linear tx paths  on MF/LF  ,

G.

 

 

From: Minto Witteveen

Sent: Tuesday, March 05, 2013 4:33 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: Re: RTTY test transmission

 

Yes Amtor might also be interesting to look into.

And I’ll stick with FSK modes only for the time being, lineair modes are not an option with my PIC+DDS9850 TX for now...

 

 

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From: Graham

Sent: Tuesday, March 05, 2013 17:19

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: RTTY test transmission

 

S..

 

Good  level  to  see  if amtor   fec   has  any  advantage ?  its  in multipsk   .. but  no idea how to  expand the  beacon text !

 

If  the  level  at  tween  is -7 ?  then  a  day  time  test of  mf-2  should  decode in the  UK  . good  chance to   Shetland  as well  if the  signal  is similar to the   OP4  test  last  July 

 

Will  take a look  later

 

73 -G.

 

From: Minto Witteveen

Sent: Tuesday, March 05, 2013 3:59 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: RTTY test transmission

 

Hi Stefan,

 

I can decode you through Twente WebSDR, abt 50% copy right now. I’m sure this will get to a solid copy later tonight.

My own sig is not much better, and I am _much_ closer to Twente... :-(

 

 

73’s Minto pa3bca

 

 

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From: Stefan Schäfer

Sent: Tuesday, March 05, 2013 15:14

To: rsgb_lf_group@blacksheep.org

Subject: LF: RTTY test transmission

 

Eddie, LF,

I just learned how to program a beacon transmission and now i'm running a test transmission in RTTY 50 Baud and 85 Hz shift on 478.2 kHz (ish). Will do some tests via Twente WEB SDR now. It's still daytime so the signal may still be down.
Picture from local grabber RX attached (antenna disconnected).

Try to catch it :-)

I would like to do some QSOs later, if someone is strong enough and willing.

73, Stefan/DK7FC


Am 05.03.2013 12:24, schrieb Stefan Schäfer:

Hi Eddie, LF,

Am 04.03.2013 20:43, schrieb g3zjo:

We make do with Windows, but it isn't perfect. In fact, Windows computers can be extremely annoying. They're full of all sorts of annoying features that just get in our way and slow us down, distracting us from getting work done or doing whatever else we want to do. We'll help you disable some of the worst Windows annoyances.

My sentiments entirely and one day it has to go to be replaced by something modern.
Just mentioned in passing no debates please. :-)

OK :-)

Now, are you prepared to listen for me? This evening i would like to make a QSO, if this is possible. However the data rate is quite high so i assume you need a relative high power to keep the error rate low.

Yes I will listen for you no problem, let me know on here when you want to try. Yes the data bits do not stay long in the same place so it is for you QRO guys or short distance and medium distance with lifts for the QRP'rs.

I slept in very early last evening, sorry, so i missed to do a test on air last night. But today!

Which baud rate and frequency shift is recommended and which frequency?

Follow Gary and be compatible seems sensible, Baud rate used is 50 shift 85 Hz QRG 478.200KHz set you baud rate and shift in Menu - MODE - RTTY - Opions at the bottom of the list.

RRRR.
I will do so :-)

73, cul, Stefan

PS: Is there a possibility to run a beacon message in that program? It is quite intuitive but i didn't find that function.

I look forward to seeing you sigs.

73 Eddie

73, Stefan/DK7FC