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.
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.
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.
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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