ARLA/CLUSTER: OZ7IGY um radio-farol para 23cm na "Next Generation Beacons platform"

[João Costa > CT1FBF]

OZ7IGY - 23 cm beacon now on Next Generation Beacons platform

Today the 23 cm OZ7IGY beacon has been migrated to the Next Generation
Beacons platform http://www.rudius.net/oz2m/ngnb

The 23 cm beacon is now frequency and time locked to GPS.
The sequence is timed to start at 00 second sending PI4 followed by a
short pause then CW ID sending callsign and locator, then pause and
carrier until next cycle. The nominal frequency remains the same, i.e.
1296,930 MHz.

To decode PI4 tune your receiver to 800 Hz below the nominal
frequency, just like you do when you want to decode a normal CW signal
at 800 Hz. On most radios this is a USB dial of 1.296.929.200. Later
in spring a new slotted wave guide antenna will be installed resulting
in an even better ERP.

The special thing about the 23 cm beacon is that the signal is neither
multiplied nor mixed to reach 23 cm. Instead the signal is generated
using the Super Nyquist principle per Analog Devices AN-939 paper.

The new beacon uses a Mitsubishi power module, RA18H1213G, but we are
not satisfied with the efficiency. So if you have a rugged and power
efficient design for 15-25 W for 12 V please get in contact with us.

PI4 is a digital modulation (MGM) specifically designed with beacons
and propagation studies in mind.

PI4 decoder download: http://www.rudius.net/oz2m/software/pi-rx

PI4 encoding examples in Arduino C, Atmel C, Delphi Pascal, Microsoft
Visual Basic and Microsoft C++:
http://www.rudius.net/oz2m/ngnb/software.htm

PI4 online encoding and frequency calculation:
http://www.rudius.net/oz2m/ngnb/pi4encoding.php

PI4 specification: http://www.rudius.net/oz2m/ngnb/pi4.htm PI4 is a
cousin of JT4, JT9 and WSPR.

OZ7IGY homepage: http://www.oz7igy.dk

73

Bo, OZ2M