800 W ... Well that answers the question Mike !
But leaves another unexpected one .. Colin reports he has 80 watts
carrier power , that puts your level at + 10 dB .. , there are + 3
dB's missing , I had anticipated a negative dB situation as from his
description, he is using a bottom loaded single wire inv L...
But, yes , correctly designed DSP is worth miles of wire and
significantly reduces PSU load !
73-Graham
G0NBD
--------------------------------------------------
From: "Mike Dennison" <[email protected]>
Sent: Tuesday, May 19, 2015 11:15 AM
To: <[email protected]>
Subject: 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: [email protected]
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: [email protected]
Subject: LF: 22:54 136 G6AVK de DF1VB/3 Op32 Deep Search 297 mi -41 dB
in Dortmund
-----
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