logo
Most Viewed Last 7 Days
436MHz DATV Up-Converter (294)
Archive2 - DATV Transmitter (147)
Nokia Amplifier Info *** TODO! (119)
10GHz ATV dx 115km (112)
Chirp Sounders (112)
22-25GHz Amplifier (91)

Radar



Cluster Activity

Spots per uW band today:
UK spotter or spotted only.

Solar data:
SFI
71
A-Index
6
K-Index
2
Exp.K
1
Sunspots
12
Activity
qui
GMF
qui
Aurora?
no

My Weather

Date:18/01/18 Time:16:03
Temp:1C
Wind Speed:0mph
Wind Dir:247deg
Pressure:996.57mB
Humidity:118%
Dew Point:4.6C
UKHASnet
Pulsed Radar Tests

I have been doing some radar tests on 3cm for a bit of fun, always wanted to do it but never got around to it!

Initial tests were with Pulsed operation which gave some reasonable results, main problem being de-sense from Tx noise getting into the Rx via the circulator i think.
Tests were with 1uS pulses of ~4W RF into 60cm dish, generates a fairly wide bandwidth signal as you can imagine!
A waveguide filter was fitted between the Transverter and Amplifier to clean this up a bit.

Rx was a PLL LNB after a PIN attenuator connected to a circulator.

Pulsed Block Diagram




A plot made with python script is here showing reflections at ~8-12km:

Radar Plot example



A basic version of the script produces this, script below:
Radar reflections example




radar_plot_echo.py









Last page added:07/01/18 10:15
M0DTS.co.uk