Re: [Discuss-gnuradio] Homing in on the mystery of Pulsy McGrooder

[Marcus Leech]

David I. Emery wrote:
>         The transponders are 1090/1030 mhz and not 1350.   1350 is just
> radar.
>   
There are double pulses that I'm seeing, with variable timing between 
the main pulse
 and the sub-pulse.  The other 1350Mhz radar is much further away from 
me, but
 perhaps the "sub pulses" I'm seeing are coming from the other radar 
station, and
 they're drifting in and out of phase with respect to one another.  The 
sub pulses
 are weaker than the main pulses by quite a bit.
>         But Marcus's description of signals every 5 seconds sounds exactly
> like radar and I bet if he has ID'd the right radar as the culprit he
> can go visit it and watch it turning around at exactly the interburst
> interval he sees.   That might in fact be a good test if he cannot find a
> better method of verifying that is his radar as various actual radars tend
> to use different antenna RPMs.
>
>         I might also add that unless propagation is strictly line of sight
> one needs more sophisticated path models to determine expected signal power.
> -11 dbm sounds rather loud.
>
>   
At 1350, the pulses are arriving 35-40dB out of the noise.  But I agree 
that a simplistic
 line-of-sight propagation model isn't ideal.  But even if this thing 
were coming in at
 -40dBm, that's still plenty-strong to screw me up!