Instruction manual

SM100 18
VARACTOR
TUNING
VALUE
70
TURNS
32
TURNS
20
TURNS
10
TURNS
30 pF 1.67
MHz
4.11
MHz
6.5
MHz
13 MHz
350 pF 490
KHz
1.2
MHz
1.9
MHz
3.8
MHz
TUNING YOUR SM-100 TO
OTHER FREQUENCIES
TUNING YOUR SM-100 TO OTHER FREQUENCIES.
In order to use your SM-100 on other frequencies,
you must wrap the coil differently. Using the table
above, and knowing your intended frequency range,
pick the correct number of turns for your purposes.
The varactor capacitive value shows the extreme
limits of the varactor’s capacitive value in this
circuit, and they are achieved in the tuning circuit.
Remember that by keeping the bandwidth of the
antenna very small, noise from unwanted stations
may be kept to a minimum.