[CQ-Contest] Understanding the dynamic error free RBN algorithm

[Pete Smith N4ZR]

I have gone through the same process that Bret describes, and found only 
a couple such instances out of thousands of spots on one day.

So I guess I need to ask again - will you make your methods and data 
public, Bret?

73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.

On 7/23/2013 8:48 PM, Brett Graham wrote:
> DJ7WW added:
>
>> Very true and a contester already adressed a contest sponsor and 
>> insisted on
>> disqualification of his competitor (ahead of him of course), whos 
>> harmonic
>> was shown on a different band in RBN.
>>
>> 73
>> Peter
>>
>> -----Original Message-----
>>
>> S56A4ZR said:
>>
>>> > Real life 0IF RX could achieve 60 dB unavoidable image rejection and
>>> > this is not enough in contests. Our ham freqs are NOT channelized
>>> > although one knows where the image is!
>> The most popular version of QSD receiver has EVEN HIGHER response at
>> harmonics of its LO than -60 dBc
>
> Though it should be noted that the LO spurious response of QSD 
> receivers does not appear on multiples of the frequency the signal is 
> really on.
>
> Direct sampling SDRs can have a spurious response that will appear on 
> multiples of the frequency the signal is really on.  Or AROUND the 
> multiple of the frequency the signal is really on, as can be seen from 
> RBN spots.
>
> CT1BOH has shown multi-multis who might find themselves behind DR1A in 
> the next CQ WW the basis for making the same complaint.
>
> I found it easier to see the spurious responses of the various SDR 
> architectures from looking at RBN spots on weekdays, as the few 
> DXpeditions or special event stations that might actually be on >1 
> band simultaneously are easy to find/exclude.
>
> Figuring out which RBN spots or signals in a recording from a SDR are 
> actually there as the station has >1 transmitter QRV or is really a 
> fecal signal - or is just a spurious response of the SDR - should make 
> for a good challenge.
>
> 73, ex-VR2BG/p.
>
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