2 Mtr Beacon Construction
The
following images show the schematic diagrams and board layouts as used
in GB3NGI and GB3ANG 2mtr Beacons
R2 and C1 form a
key click filter
C2 provides the desired
frequency shift
Parts List
|
R1 |
R2 |
R3 |
L1 |
C1 |
C2 |
D1 |
|
2k2 |
10k |
33k |
100uH |
0.1uF |
2p2 |
BB405B |
The FSK board as used in these beacons is much larger than necessary as it replaces an original board within the T4002 transmitter
Parts List
|
U1 |
U2 |
U3 |
VR1 |
R1 |
R2 |
R3 |
TR1 |
C1 |
|
4049 |
4020 |
82S129 |
200k |
10k |
4k7 |
3k3 |
BFY51 |
0.01uF |
Further information on beacon keyers can be found at the following sites
http://www.g4jnt.com/beacons.htm
http://k1el.tripod.com/KID.html