Thanks Paul,
Yes , that's a full decode , -40 is round the switch over point ,
The % fade is the amount of lost 'bits' along the time line , the
graphic , simply shows , 'where' the bits where 'lost'
A decode or Dynamic spot may be achieved with a loss up to approx 60%
of the data , either randomly , or in block's along the time line .
The displayed s/n is the average over the Tx period , as is the
Frequency [ recovered audio] average of the Tx
Using Manchester coding , There are no synch requirements , each bit
contains ''data and sync'' , so its impossible for the system to
loose lock, ie, any bit that is recovered is usable , so interim's of
static / noise , the duration of the Tx pulse compared to the noise
bursts is 'very long' , this coupled with tailored dsp routines , provides
good performance on the lower bands , as dose the 'dispersed' decoder
version , deployed at VHF , which provides immunity to Doppler , Luis
EA5DOM , used the Op1 [ 60 second ] to achieve EME on 23 cm , with
round 50% data loss ,
73-Graham
G0NBD
--------------------------------------------------
From: "N1BUG" <[email protected]>
Sent: Thursday, April 13, 2017 2:10 AM
To: <[email protected]>
Subject: Re: LF: 136 OP32 LAST 24HR
On 04/12/2017 01:58 PM, Graham wrote:
Second decode for DF2JP with N1BUG , at -40 could be either
decode or dynamic ?
2017-04-12 06 :48:30 DF2JP AA N1BUG FN55MF 0 136 -40 Op32__~40dB
I don't understand Opera very well...
But, I think this was a decode??? On my screen, using opera 1.6.4 in the
lower pane it was in red, it did *not* say Deep Search and it said fade 2%
with a long row of ---------
--
Paul
N1BUG 160m-2m DXCC Honor Roll
WI2XTC 2200m-630m Experimental license
FN55mf ME Piscataquis County
http://www.n1bug.com
http://www.aurorasentry.com
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