Re: LF: DUAL BEACON WSPR + OPERA 500Khz

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Stefan et al,

On TX the WSPR software will allow tones to at least 8.97kHz to be produced (just change TX tone frequency in the WSPR window) and I think considerably higher. I used this when G6ALB and I did some 8.97kHz VLF earth mode tests between us 3km apart, VERY successfully too - just 4W would have been solid. 

On RX we had to mix down to allow the software to decode. 

So far here on 500/477kHz I am seeing little difference between OP2 and WSPR. 

73s

Roger G3XBM

-- Via my 2.4GHz transceiver --

On 14 Jul 2012, at 01:09, "Graham" <g8fzk@g8fzk.fsnet.co.uk> wrote:

Ok Stefan,

 

QRT  , next to  look at the  reports  , I think  tonight  , minimum   decode  levels  are very  close ,  the  longer  OP modes are much lower , but the  qsb on 500 tends to  prevent  gain being  made by  extended  times

 

Opera   was  designed to  be  sent  by a  normal   CW  Tx   , psk/fsk    has a  dB  advantage , but  not  all  stations  can send   fsk or  psk, , especially  on  136  .. Without the  racal  ma1723 , it  would  be  difficult to  use fsk or  psk  on  500  , ( not that  psk  is  any  use on 500  .. too  much  phase  shifting ) 

 

Not  sure on the  wspr  settings , I dont  think the  software  can  produce   12 Khz  ,   stations  use  ,pic-dds  , that  may  be a  way  ahead ?

 

But tonight , using the  m-delt4    sound  card , I found the    mixer  monitor  could  be  used to  combine  2  channels  , so  the  audio  quality  was much better  than  in the  past, with  no  IMP  showing  ...

 

73 -G.

From: Stefan Schäfer

Sent: Friday, July 13, 2012 11:26 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: DUAL BEACON WSPR + OPERA 500Khz

Hi Graham, LF/MF,

Nice setup to see which mode is "better". Rik/ON7YD has done some tests a few months ago i remember. Now you need many receiving stations who monitor these 2 modes to the same time as well.
Compared to WSPR i clearly find Opera an advantage regarding the ease of keying the PA without the need of FSK.
On LF i could run both modes since i have the IQ upconverter (can WSPR set to an output frequency of 12.5 kHz?? (to be mixed with 125 kHz)) but on MF i would need to extend my setup...

I really would like to join in tonite but i can't :-(((

73, GL, Stefan/DK7FC



Am 13.07.2012 20:20, schrieb Graham:

No  cheating  , carriers  are  identical  !

 

tnx  Gary  for  grabber 

 

73 -G. 

 

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From: Graham

Sent: Friday, July 13, 2012 7:06 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: DUAL BEACON WSPR + OPERA 500Khz

All,

 

DUAL  BEACON   WSPR + OPERA   500Khz

 

Running   dual  beacon  , parallel   Tx times ......Tx   100%   duty cycle

 

Dial  set   500.000  Khz  USB 

 

73 - Graham

G0NBD