GM Simon, something strange happened yesterady sunday on 15 and 10 meters with my SDR_IQ and console b360#2.

I have SWL_ed in the IOTA contest for a while and all has flown OK on 40 and 20 meters.
Lot of stations and many have been one above the other ;---).
Almost all have been copied , but the "STRANGE_THING" happened on 15 and 10 meters.
See the pic : http://groups.yahoo.com/group/sdr-radio-com/photos/album/1050649225/pic/427902982/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc

Here is to be seen a local friend's signal at S 9+20/30 level, about 1km away with 100w and a yagi.
During the transmission the whole SDR RX window disappears .....uhmmmmm .
When he ends the transmission there is a BLACK_HOLE of about 1/4 second then the band is again visible.
And so on at every TX RX passage.
I have tried also to move away the RX window about 100khz below and the same happened.
A short test on 10 meterrs also made the same THING.

I have tried in the afternoon to feed an 15mt signal with my RF_Gen at about S 8 - 9 and have noted that the RX window also disappears.
Lesser but disappears.
As I am not a programmer but only a key-depresser I cannot say what happens on 15 and 10 meters.

In a REAL RX such occurrence would show to a poor hardware design, but in a software radio where is the problem ?
73
Phil

Hi again, if it would be only a viewing problem then Ok,
but the PROBLEM is not just on the viewing side, I suppose is deeper.

I was listening to some weak signals some Khz away (5 to 20 don't remember) from my friend's QRG
and when he went ON_AIR I was not more able to listen to the weak signals.
That on 15 and 10 meters. On 20meters was OK.

To replicate such occurrence I have to wait for another contest, so the band is full of weak signals plus the friend's strong one.
Maybe an IQ recording would be much better ( when Simon will add it).

Or better having a power combiner and 2 RF_generators to make all
the tests. Unfortunately I have not so much instruments.
Friends with such RF instruments live far from me.
The curiosity for a solution is HIGH and the time for experiments is very tight at the moment.
Have to delay toward fall-time.
73
Phil

uuuhpssss... you are a continue "discovery", just seen the IQ recorder "hidden" in the menu bar.
73
Phil