From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: 23:16    136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40
 dB 
Thread-Index: AQHQkPo0vSfDPoNeU0Gh7wA/3aPJTp2B7/2AgAEGAICAACUhYA==
Date: Tue, 19 May 2015 10:46:55 +0000
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In-Reply-To: <555B1B53.6687.2F1817@mike.dennison.ntlworld.com>
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Subject: RE: LF: 23:16    136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40
 dB 
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Hi Mike

Op32 with dynamic search is a fantastic tool indeed. Despite of the "fantastic" false decodes from time to time !
But those can be easily discharged, specially when having local reports of the Tx station

I made an experiment comparing Op2H (no deep search) with Op32 and it showed out that both modes perform very similar
The experiment was made transmitting with U3 consecutive frames in Op32 and Op2H. I'm using a mechanically adjustable
vertical antenna so trimmed it down in order to get just a signal hardly decoded on my monitor QTH at 7Km
It is amazing to check how just a little of vertical antenna height increase can boost the Tx signal ! :-)

I set the results in an small Excel you can get here https://dl.dropboxusercontent.com/u/7162072/Docs/Pruebas%20Op2H%20versus%20Op32.xls

The question is .... What should be expected from a Op2H with Dynamic Search ??

73 de Luis
EA5DOM

 

-----Mensaje original-----
De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de Mike Dennison
Enviado el: martes, 19 de mayo de 2015 12:16
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: 23:16 136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40 dB 

Well, I am running around 400mW ERP (as stated on my Opera beacon) from a transmitter with 800W RF output giving 3,2A into an inverted-L 14m high with 5x14m parallel top wires. Antenna efficiency (assuming 80% tx PA efficiency) is 0.05%.

I imagine G6AVK is running a lot less - from the reports it must be about 70mW ERP which suggests perhaps 0.1% antenna eficiency. His successes show how useful Op32 is.in producing reception at 1000km+ with that power level.

Mike, G3XDV
===========
 
> There  is  a  interesting  question  ..
> 
> Two  LF stations ,  quite  close , similar  times ,  Colin   running 
> 80  watts  carrier  power.. 
> 
>  what    power / Ae  efficiency    difference     produced     + 7 
>  and  +8 dB  at the  Rx's  ?
> 
> 73-G
> 
> 
> Rx at Mon, 18 May 2015 00:34:21 GMT
> From G3XDV by DF1VB/3 Loc JO31SK
> Frequency: 0.136 MHz (2200m), OPERA, -33dB
> Distance: 536 km bearing 91°
> 
> 
> Rx at Mon, 18 May 2015 00:34:21 GMT
> From G3XDV by EB3FRN-1 Loc JN01MC
> Frequency: 0.136 MHz (2200m), OPERA, -32dB
> Distance: 1194 km bearing 174°
> Using: Opera v1.5.7/Rptr V1.6
> Antenna: RX Op32
> 
> 
> 
> From: Graham
> Sent: Monday, May 18, 2015 12:31 AM
> To: rsgb_lf_group@blacksheep.org
> Subject: LF: 23:16 136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40 
> dB
> 
> 
> Just 80 watts , just on the   Op32 decode  limit ,  dynamic  with  5  
> dB  in hand ?
> 
> 73-G,
> 
> 23:16 136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40 dB in Montbrio 
> with .w + Bottom loaded Inverted L 11m x 21m
> 
> 23:16 136 G6AVK de DF1VB/3 Op32 Deep Search 297 mi -40 dB in Dortmund 
> with .w + Bottom loaded Inverted L 11m x 21m
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> From: Graham
> Sent: Saturday, May 16, 2015 12:36 AM
> To: rsgb_lf_group@blacksheep.org
> Subject: LF: 22:54 136 G6AVK de DF1VB/3 Op32 Deep Search 297 mi -41 dB 
> in Dortmund
> 
> 
> 
> 
> 
> 
> -----
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