Updates:

ON0GHZ/B Microwave Beacons JO20KV

status info now on http://www.beaconspot.eu

team ON4IY, ON4CDU, ON4AMX and ON7NP



Band Licensed Actual Power Control Status Heard
13cm 2320,975 see status 15W ERP free running http://www.beaconspot.eu
6 cm 5670,975 see status 50W ERP free running http://www.beaconspot.eu
3cm 10368,925 10368,9250
50W ERP GPS locked
http://www.beaconspot.eu
1,2cm 24048,050 24048,0493 20W ERP GPS locked http://www.beaconspot.eu



I am no longer responsible for the ON0KUL beacons....I hope to hear ON0KUL / 3cm again soon, but I have no further info.

The beacons are in the "big" tower of ON4AMX - we appreciate his assistance. We also thank the UBA for sponsoring our beaon license.



13cm

Simple and straightforward application of the DB6NT beacon transmitter, with a 60 degrees Xtal heater. Pout 1,2W and 10 dBi antenna (slotted waveguide). The beacon and the return loss (-38 dB at 2320 are shown) are shown below. I calculated the beacon antenna in stock alu tubing and frank PA4FP machined it. It works very well as far as I can tell, with little tuning. More antennas are available. QRG 2320,975 MHz, QRA JO20kv, 110 mASL.


beacon picbeacon return loss



6cm

Simple and straightforward application of the DB6NT beacon transmitter, with a DB6NT heater PCB. Pout 5W and 10 dBi antenna (slotted waveguide). This beacon has a New Zealand surplus SSPA. The beacon is shown below. I calculated the beacon antenna in stock alu tubing and frank PA4FP machined it. It works well as far as I can tell, but requires more careful tuning than the 13cm version. More antennas are available. QRG 5760,975 MHz, QRA JO20kv, 110 mASL.


6cm bcn

3cm 10GHz

This is a third generation beacon, it is entirely synthesized using a DDS AD9912 as LO.
A Thunderbolt GPSDO is used to generate 10MHz, and a 1 GHz Crystek V-CRO is locked to this reference using the AD4107 xlock PLL. The Crystek CRO provides the DDS Clock. The beacon is DB6NT, with XO removed. The 10W PA operates at 5W into a slotted waveguide.


1.2cm 24GHz

This is a second generation beacon. A Thunderbolt GPSDO is used to generate 10MHz, and a G8ACE VCXO LO is locked to this reference using the xlock PLL.  The mast unit consists of a surplus multiplier chain to 12GHz, a doubler and a 500mW high gain surplus amp. The 2*12 slotted waveguide was provided by the late W3IY. The A1A modulation currently uses a PIN switch causing some FM, but the carrier stays in 100Hz on average with slight warbling. We have decided not to further explore the XO route, concentrating on a DDS for LO generation, so no effort was done to further optimize. The PLL loop is not very wide, a few 10s of a Hz.

24G bcn

The exact frequency is 24048049,03.

A     B     N         R       IF    QRG     XTAL
6     1532  12262     979     0     24048   122.250260


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