Re: LF: Cats among pigeons

[qrss <qrss@talktalk.net>]

Thanks for posting the info Albert, that is what was needed.

I assume Av is the average of the minimum signal levels obtained from 
the large number of test.
73 Eddie G3ZJO

On 12/02/2012 09:42, Albert wrote:
> Hello all Opera lovers,
>
> Testing Opera speed op1 till op32 under "lab" conditions without the 
> real world phenomena like fading and QRN.
> The results:
> 1. if you have solid Opera decodes the received SNR stays the same 
> when switching between opera speeds;
> 2. the only change is the minimum level where decodes are still possible.
> After a large number of test transmissions I gathered the following 
> results.
> Op1   decode @ -24dB Av
> Op2   decode @ -27dB Av
> Op4   decode @ -30dB Av
> Op8   decode @ -33dB Av
> Op32 decode @ -37dB Av
>
> Test set up: TX Flex 1500, 0.2 mw output, attenuators Bird and HP > 
> 120 dB, min. step 1 dB, RX Flex 5000, Software Opera v.1.2.8 Windows 7 
> 64.
> 73, Albert PA0A