Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: WSPR2 coast-to-coast

To: [email protected]
Subject: Re: LF: WSPR2 coast-to-coast
From: Stefan Schäfer <[email protected]>
Date: Thu, 19 Dec 2013 21:52:23 +0100
Authentication-results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of [email protected]) smtp.mail=[email protected]
Delivered-to: [email protected]
In-reply-to: <2BC26D22A52E4757B0594C7206436E9A@AGB>
References: <003901cefcb5$550368d0$6401a8c0@JAYDELL> <[email protected]> <2BC26D22A52E4757B0594C7206436E9A@AGB>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
G..

I'm waiting for the discussion about performance compared to WSPR, average power, peak power,  SNR and minimal decode level :-) It is at least 2 weeks ago and wasn't even 10 times this year. You have to hurry :-)

73, Stefan/DK7FC

Am 19.12.2013 21:26, schrieb Graham:
Bob , Well  its  true  that  Opera  is a averaging  mode  
 
But  Most  if  not  all  now  running  on  477  are  using  the  full  system  , don forget  the  system  has no  need  of  high  stability  in the  tx or  rx  being  able to  tack  drift  by  AFC , so  any  ham set / dongle  etc is  fine  for  Rx or Tx , the  com-port CW  drive  is primarily  to  allow  access via  CW/QRSS   transmitters , that  cannot handle  MFSK 
 
Using   Rx  and  the  Tx-audio  drive , the  carrier  is  placed  in the  lowest  s/n  'slot' measured  in the  mS's  before  the  system  state changes to TX  , each  Tx  of each  user is  on a  'new'   qrg 
 
The   OP2 / OP4  modes  are round  the  same  level  as  wspr-2  , the  first  TA's  using  Opera  where  using  OP2  , OP8 is  about as  long as  the  477  band  will  stand ,
 
The  Op decoder  is quite  robust and is not  de sensitised by  strong  in/out  band carriers , wspr  was designed for  HF , where  its  very  unlikely  that  ground wave  level  signals  would be  encountered , strong  carriers  do  suppress its performance , Op was developed on   500/136 K  , the  shorter modes  HF and up
 
Thing would be  to  organise a  'top fuels    477 party over there  and  see  what  happens   
 
73,G,
 
 

From: Bob Raide
Sent: Thursday, December 19, 2013 4:01 PM
Subject: RE: LF: WSPR2 coast-to-coast

Jay, et all;
I think if the "average Joe" on 500 would go through the trouble of adding "Deep Search" to any of the OPERA modes, lower power beyond that required by WSPR would be possible for similar decoding.  Another plus would be not having to limit numbers of transmissions per hour because of the less likely RX overloading.  But the "average Joe" isn't gonna go through the trouble of adding "DS" to OPERA, I would assume? Bob
 
> From: [email protected]
> To: [email protected]
> Date: Thu, 19 Dec 2013 07:24:58 -0500
> Subject: LF: WSPR2 coast-to-coast
>
> G
>
> There were 31 WSPR2 'coast-to-coast' (west coast US and EU simultaneous receptions) on 475 kHz last
> night from WE2XGR/2 alone ... WE2XGR/2 > K7IUV and WE2XGR/2 > G3XKR. Apparently WSPR2 wins the
> 'coast-to-coast' competition on 475 kHz ... especially so when one considers WSPR2 is a two minute
> cycle time and OP's best time is 4 minutes.
>
> And ... this was done with moderate transmit power.
>
> Jay W1VD WD2XNS WE2XGR/2 WG2XRS/2
>
>
<Prev in Thread] Current Thread [Next in Thread>