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
>
>
>
>
>
>
> -----
> No virus found in this message.
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> 05/19/15
>
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