Re: LF: ROS 500kHz test beacon

["Graham" <g8fzk@g8fzk.fsnet.co.uk>]

Rik

 

Just about  made a  qso  hi  .. my  station  not set for 500  sending  with  more  ref power than  fwd hi , partial  decode by  Gary, however , looks like you  need  to  capture the  start  sequence to  decode the  frame ... the  same as  the HF modes , apparently it used a  sudo-random code sequence overlaying  the  data  stream , so  a simple de-code by  position is not  possible  .. one of the  hf modes also  uses this  system ..domino I think ?

 

G ..

From: Rik Strobbe

Sent: Wednesday, April 28, 2010 9:49 PM

To: rsgb_lf_group@blacksheep.org

Subject: RE: LF: ROS 500kHz test beacon

Hello Gary,

 

I just downloaded and installed ROS.

After launching it I first thought it was a flight simulator ;-)

I got 2 solid copies at 20:32 and 20:38 (you attempting a QSO with G0NBD). ROS gives only -29dB (almost on the red area) despite the fact that I can see you signal with SpecLab in QRSS1 modus and when to QSB boosts up I can even hear it. If I knew the coding it would be easily possible to decode it using the SpecLab screenshot.

To have a better idea about how robust ROS is you would need to reduce your ERP by several dB.

 

73, Rik  OR7T - ON7YD

 

---

Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Gary - G4WGT [g4wgt@tiscali.co.uk]
Verzonden: woensdag 28 april 2010 21:38
Aan: LF Group (RSGB)
Onderwerp: Re: LF: ROS 500kHz test beacon

Hi LF,

I failed to state the frequency.

503.600 kHz.

Dial 502.050 kHz USB.

1 minute PTT loop.

73

Gary - G4WGT

On 28 April 2010 20:03, Gary - G4WGT <g4wgt@tiscali.co.uk> wrote:

Hi LF,

I will run ROS data mode again tonight starting now.

I will increase transmitter power a little to 5 watts making the ERP 15mW estimated.

I will be in Rx mode also, reports & QSO attempts will be welcome.

73

Gary - G4WGT.