[Linrad] Re: Perseus with Linrad

[yo4aul <arrl.net; yo4aul@xxxxxxxxxxxxxxxx>]

Hi Leif,
Thanks for your attention. I guess that your calibration files for
Perseus
will be useful to all Perseus owners.
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.
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.
Also noticed that even if in Linrad baseband waterfall the  signal was
still visible, you could not detect the signal audio output by ear...
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
I would appreciate if you could supply the Linrad optimized settings
for Perseus week signal detection
Pls also advise if the a.m. findings are correct.

73 Corneliu

On Jul 2, 2:55 am, Leif Asbrink <l...@xxxxxxxxxx> wrote:
> Hi Corneliu,
>
> > 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

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