Linrad for adaptive RX for EME

[no fu]

Hello Linrad friends,

I finished my XPOL Antenna installation and have implemented 

HA1YA XVTR -> Afedri Dual SDR -> Linrad -> MAP65

and I am looking for some support / help for the Linrad settings. While I am certainin it is a fantastic piece of Software, without a PhD (just kidding) 
it is somewhat difficult to tune the settings for the optimum.

I am looking for examples of settings other people have used / are using, ideally with a similar set up.

Many thanks - Norbert / OE3NFC

PS.-. If someone has a SIGP-1 calibration kit, I would be interested too!

[Dominique Dehays]

Hi all ,


it is more and more difficult to find Pcs equipped with a LPT port. Is
the now classical USB to // compatible with Linrad and wse?

73

Dom/F6DRO

[Dominique Dehays]

Hi all ,


I have left my UADC4 on the side untill I get some time to work on it.

I just want to be sure. Where should I download the DIYINHK driver? I've
found some links via google , saw 3.38 as recommended in the manual but
also some other newer versions , which one should I use?

73

Dom

[Leif Asbrink]

Hi Dom,

there is a device USB2LPT by haftmann which works well with Linrad.
I do not know whether that is what you asked for.

73

Leif

> --
> There is an excellent Linrad User Guide by Gaetan, ON4KHG, at:
> http://w3sz.com/Linrad%20Installation%20&%20Configuration%20User%20Guide%20-%20V1-0.pdf
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[Leif Asbrink]

Hi All,

it has come to my attention that ARM computers can
use the GPU to get a 10 times faster computation of FFTs:
http://www.aholme.co.uk/GPU_FFT/Main.htm

this page is also relevant:
https://github.com/mn416/QPULib

Personally I am busy with studies of sideband noise so
I will not try to implement faster FFTs in Linrad myself.
There are many other things that I will need for the
sideband noise project:
Larger size for fft1. Now limited to 65536.
Double precision floats for fft1. Single precision does
not allow the dynamic range of my current hardware at
fft1 sizes of 32768 and above when correlation is used.
Functions to evaluate AM and FM modulation in correlation
spectra.

Maybe someone else would be interested in adding support
for the ARM GPU in Linrad?

73

Leif

[Zaba OH1ZAA]

Hello Leif,

Still my best wishes to you for 2020. I hope it will as
productive as last year! Today I sampled some of your
great nerds45-nerds49 YouTube-videos. I assume those
have started at nerds01 (or in old HP-85 BASIC-terms:
OPTIONBASE0 at nerds00?).

Do you mean to say that if I take a regular oscillator,
and I put that through a quality frequency-doubler, that
my phase-noise will be orders of magnitude better?

The reason for using 8 x J310 FET's in parallel, is that
for averaging/lowering noise figure, like in the Javornik
type 4 x BF998 preamps?

Cheers/73, Zaba OH1ZAA


P.S. It's at least six years ago that my WSE's negative
rail voltage got defect. It is a shame that those boxes
have been standing unused for such a long time. By-the-way
is there any advantage in combining X-phase QRM-eliminators
together with linrad. I assume it advantageous to start with
a low as possible QRM/QRN level even with linrad. Anyway, it
is time to repair the -15 V power supply for WSE.

[Leif Asbrink]

Hello Zaba,

> Still my best wishes to you for 2020. I hope it will as
> productive as last year!

My best wishes to you in return:-)
I will continue for a while with the nerds series. There
are many more things to look at....

> Today I sampled some of your
> great nerds45-nerds49 YouTube-videos. I assume those
> have started at nerds01 (or in old HP-85 BASIC-terms:
> OPTIONBASE0 at nerds00?).

The first one was nerds1. I did not know how many
positions to reserve for the number;-)

> Do you mean to say that if I take a regular oscillator,
> and I put that through a quality frequency-doubler, that
> my phase-noise will be orders of magnitude better?

No, what I say is that a quality doubler will degrade
phase noise with the theoretical 6 dB and not more even
if you start with a very good oscillator.

> The reason for using 8 x J310 FET's in parallel, is that
> for averaging/lowering noise figure, like in the Javornik
> type 4 x BF998 preamps?

The multiplier runs at 1 W input power and to make the wide
band noise well above -174 dBm/Hz I need the output power
to be of a similar level. Many parallel transistors is for
the power handling. For 1 W output power I would need 5 W
DC power assuming an efficiency of 20%. The J310 is rated
250mW. I do not remember the details.

> P.S. It's at least six years ago that my WSE's negative
> rail voltage got defect. It is a shame that those boxes
> have been standing unused for such a long time. By-the-way
> is there any advantage in combining X-phase QRM-eliminators
> together with linrad. I assume it advantageous to start with
> a low as possible QRM/QRN level even with linrad. Anyway, it
> is time to repair the -15 V power supply for WSE.

If you have more than two antennas you could use phasing
to combine pairwise for a reduced level of qrm. Particularly
useful to have a small antenna with strong coupling to one
particular interference source and to use it with QRM eliminators
together with the main antennas. Then another small antenna
(small antenna is E-field probes or H-field probes) to eliminate
another local interference source. Finally combine main antennas
pair-wise with QRM eliminators until you have two signals only
that you can feed into Linrad.


73

Leif