FM-MIKE 88 - 110 MHZ
________
\ANT /
┌──────┐ \ │ /
│ │ \│ /
Q2 ┌──────┬─────┬───∩∩∩∩∩∩∩∩─┐ │ \/
C6 R8 ├┘ │C7 \│ L1 │ └───┘
┌─┤├─/\/\/\/\─┬──┼┐NPN ═╪═ ══\══C8 │
│ │ └>┬────┘R1 │\| │
│ │ └─/\/\/\/\─┼─────────┤├─┤
│ │ R10 │ C9 │
│ ├───/\/\/\/\─────)───────┬────┤
│ │ C10 │ │ │
│ │ ┌───┤├────┐ │ │ │
│ └──┴/\/\/\/\─┴───┤ │ ───┴────
│ R9 │ │ ──── B1
│┌─────────────────────────────┤ │ ────────
└)──────────────────────────┐ │ │ ──┬─
│ C1┌──┤├──┬────)──┴───────)─┬───┤
│ │ C2 │ │ │ │ ══╧══
R2 │ R1 ├──┤├──┘ │ │ │ ═══
┌/\/\/\/\┤ ┌/\/\/\/\┬─┘ R7 │ │ │ ═
└┬──┤├───┤ │ ┌───┼──/\/\/\/\───)──────────┘ │
R│ C3 │ │ │ │ │ │
e│ ┌───┘ │ │ │ R4 │ │
d│ │Shield │ │ └──/\/\/\/\┬──┘ │
┌┴───┴┐ │ │ R3 ├┘ Q1 │
│ │White │ └──/\/\/\/\─┬─┼┐NPN R6 │
│MIKE ├──────┴────────────┤├──┤ └>┬/\/\/\/\┬────┤
└─────┘ C4│ └───┤├───┘ │
┌─/\/\/\/\─┘ C5 │
│ R5 │
└─────────────────────────────┘







I.D. Val Quantity

R1 10 K ohm 1/4 Watt 1
R2,6,7,8 1 K ohm 1/4 Watt 4
R3 100 K ohm 1/4 Watt 1
R4 8.2 K ohm 1/4 Watt 1
R5,10 15 K ohm 1/4 Watt 2
R9 3.9 K ohm 1/4 Watt 1
R11 220 ohm 1
C1 100 uF 25V (electrolytic) 1
C2 470 pF 50V 1 (may not be needed)
C3,5 10 uF 25V 2
C4,9,10 .01 uF 50V (disc) 3
C6 1 uF 50V (electrolytic) 1
C7 5 pF (mica, zero temp) 1
C8 6 - 35 pF Trimmer cap 1
Q1,2 PN2222 (NPN High Beta) 2
M1 F.E.T. Cap Mike (Field Effect, capacitive. Radio shack elec.
or even 8 ohm speaker (with resistors) will work ok)
B1 9 V Transistor battery.
L1 ** 8 turns of number 16 guage buss (solid) wire around a number
8 wood screw.
ANT Wire attached to 2nd (or 3rd) coil of L1. (Soldered, and strain
relieved.) Length may be approx 6". For experimental purposes,
try this. 300,000,000 METERS
______________
operating frequency

If operating frequency is 109 Mhz (Mega, or million Hertz),
300,000,000 divided by 109,000,000 = 2.752 Meters
Take a wire 2.752 meters long, cut it in half, put one half
on the 2nd (or 3rd) coil, the other half on the - (ground)
side of the battery, and make the two 180 degrees apart.
Works great!




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* Origin: HAMRADIO telnet lu9dce.dynu.com (21:5/101)