> > Is anyone using Perseus with Linrad?
> > Is it necessary to calibrate Perseus to use the smart blanker?

> Yes. Or rather Linrad needs a calibration file from where it can
> collect the pulse shapes for your hardware. The calibration
> procedure gives some freedom to the user to optimise his system
> for different purposes, but for the Perseus I do not think it
> is very interesting to go much above 80% bandwidth usage because
> of the aliasing that would then become visible so for the Perseus
> it would be possible to supply a calibration file for each sampling
> rate.

> I have been on travel for a couple of days and I have some other
> things to attend to, but with time I will give whatever support
> needed to make you, and anyone else who might be interested, able
> to use Perseus in an optimal way with Linrad:-)

> In the meantime, use the dumb blanker. It is far more clever
> than any conventional blanker you might find in other receivers.
> Analog or SDRs.

>   Regards

>   Leif / SM5BSZ

> > I guess that your calibration files for Perseus
> > will be useful to all Perseus owners.

> Yes:-)

> > I have tested Perseus plus a downconverter 144/28 with a signal
> > generator and a calibrated attenuator with 1 dB steps
> > for MDS and have discovered that Linrad and Winrad main waterfalls are
> > about 10 dB more sensitive than Perseus software.

> There is not really any limit. You can set the bandwith extremely
> narrow in Linrad and average over VERY long times so you can find
> signals that are very much weaker if you wish. That is really the problem
> with Linrad. Any setup I might suggest will be targeted to some
> particular usage and your interest could be something else. That
> is why I do not supply parameters for any particular hardware
> but rather for specific usages.http://www.sm5bsz.com/rf_library.htmhttp://www.sm5bsz.com/linuxdsp/us...
> There are many links here:http://www.sm5bsz.com/linuxdsp/linroot.htm
> Some of them give examples on various usages of Linrad.

> > also noticed that even if in the Perseus main waterfall you could not
> > see anymore the signal, in the extended window the signal was still
> > about 10 db above noise floor.

> This just depends on the parameters you have selected. Linrad allows
> you th have it the other way around in case that is what you want.

> > Also noticed that even if in Linrad baseband waterfall the  signal was
> > still visible, you could not detect the signal audio output by ear...

> YES:-)

> > I have noticed also that the dumb noiseblanker is quite effective
> > except in the condition when the signal is very close to the noise
> > floor when also the signal gets attenuated by blanker

> That is because you do not use the dumb blanker properly. (I think)

> > I would appreciate if you could supply the Linrad optimized settings
> > for Perseus week signal detection

> There is no such thing. Your local QRM/QRN situation might make
> it optimal to use a different calibration or different sizes
> for transforms. What you mean by weak signal is also a personal
> matter. Chasing weak EME signals is quite different from
> chasing weak SSB bursts in meteor scatter SSB. If you want to work
> weak signals in a terrestrial contest I guess you would not want
> the delay from antenna to loudspeaker to exceed 2 seconds or so.
> (In EME, 10 seconds is fine.)

> I have asked (many times) for recordings of situations where a signal
> is difficult to copy in order to use such examples here:http://www.sm5bsz.com/rf_library.htm

> There are many interesting aspects of interference fighting
> and signal detecting that I would like to demonstrate - but
> I want to do it on real signals not just simulations of mine.

> > Pls also advise if the a.m. findings are correct.

> Something is wrong with your blanker observations. Otherwise
> I think it is correct (but very limited.)

> 73

> Leif / SM5BSZ