logo
Most Viewed Last 7 Days
436MHz DATV Up-Converter (266)
ATV Dx Gallery (84)
DVB-S USB rx (84)
RTLSDR Si5351A reference (77)
MMDS Converter on ATV (77)
ATV Contest 2007 (77)

Radar



Cluster Activity

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

Solar data:
SFI
69
A-Index
14
K-Index
4
Exp.K
3
Sunspots
0
Activity
qui
GMF
act
Aurora?
no

My Weather

Date:22/07/17 Time:12:36
Temp:15.5C
Wind Speed:15mph
Wind Dir:157deg
Pressure:1005.63mB
Humidity:106%
Dew Point:16.7C
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:02/07/17 18:16
M0DTS.co.uk