[amsat-bb] LEILA questions

["Wayne Estes W9AE" <w9ae@xxxxxxxxxxxxx>]

I have a few questions that I hope a "LEILA expert" can answer.

1. Is it possible for the LEILA DSP to be programmed to have a noise blanker
function before the "scan jam notch" function?  The objective would be to
prevent radar pulses from triggering the LEILA siren/notch so frequently.

2. Is it possible for LEILA to be reprogrammed to disable the extremely long
siren/notch episodes?  The "standard" LEILA siren/notch lasts about 5
seconds, and is a tolerable nuisance even when it's not caused by a
transponder user.  The 1-minute siren/notch episodes are a significant
disruption to transponder operation, and they do NOT seem to be caused by
hams using excessive uplink ERP.

3. Is it possible for the LEILA notch to be reduced from ~10 kHz wide to
only 5 kHz wide?  Presently the LEILA notch affects many "innocent
bystanders" because the notch is much wider than an offending SSB signal.

4. Does the present LEILA behavior (frequent long notch/siren episodes
presumably caused by radar signals) reduce radar's impact on the U-band AGC?

Thanks in advance.  LEILA serves a useful purpose, but I'm just wondering if
there are any opportunities to improve the DSP code to significantly reduce
the "collateral damage" of LEILA.

Wayne Estes W9AE
Mundelein, IL, USA




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