[CQ-Contest] Busted Reversed Beacon Network spots

[Pete Smith N4ZR]

Interesting - I "admitted" what?  That there are a lot of Softrock-type 
receivers on the RBN, some of which have inadequate I/Q image 
reduction?  Sure. That direct downconversion receivers like the QS1R 
occasionally throw what look like I/Q spots, even though there is no 
simple explanation.  Sure.  I saw mine throw one of those just 
yesterday. Wish I knew why.

The RBN teamis actively working on a promising technological solution to 
get rid of all of thisclass of busted spots.

Wrong-band spots are quite another creature.  I'm still waiting for data 
on these, but think that either inadequate harmonic suppression and/or 
intermod will be shown to be the source. If that's the case, then the 
receiver used probably makes little difference.

Bret, before you attack SDR receiver performance indiscriminately, take 
a look at Rob Sherwood's review of the KX3.

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 6/8/2013 11:37 PM, Brett Graham wrote:
> Eventual admission from N4ZR that a subset of just 
> wrong-freq-same-band spots were seen at a tad over one-per-minute 
> (during a contest) got me looking at this again, using non-weekend RBN 
> data for 2013-03-08 (also with all spots of DXpedition/special event 
> calls omitted, so hopefully missing majority of stations deliberately 
> QRV on >1 band or >1 frequency within same band simultaneously, or 
> deliberately transmitting a fecal signal as no contest that day).