6
device. As long as the antenna is off the 50 Ohm feed match, the LED will lighten. If
you forget to switch to operate for QSO, your signal will be 6dB down, because only
a quarter of the power is coupled to your antenna
Now the backplane, left to right:
BNC IN
Connect your transceiver here.
S2
S2 switches between symmetrical and unsymetrical feeder. Actually the ZM4 is a
real symmetrically ATU but it can used for unsymmetrical antennas (Coax, endfeed)
with the help of this switch. Conect Koax to out and endfeed wires to RED with
counterpoise do black)
Bananajack SCHWARZ(black)
one wire of symmetrical feeder or counterpoise
Buchse ROT
one wire of symmetrical Feeder or Longwire, endfeed.
S5
switches between low and high impedance. Which you need depends on your
antenna. Try for best results. Switch upper position is high and lower position is low
impedance
Part List:
1
Enclosure
1
PCB
6 Resistor 100 Ohm 2 Watt
1 Resistor1k
2 Polyvaricon Variable Cap
1 Diode 1N4148
1 LED3mm red
1 Ferrit Torroid FT37-43
2 BNC Jack for PCB mounting
1 Cap 390pF
1 Cap 220pF
1 Cap 270pF
1 Torroid T130-6 (yellow)
1Switch 1 row
2 Banana Jack
1m CuAg wire
2 switchup down
2 Switch up down middle
50cm Draht red
50cm Draht brown
100cm Draht yellow
30 cm Draht blue
100 cm Draht bleck
100cm Magnetwire 0,2mm CuL
Summary of Contents for ZM-4
Page 8: ...8...
