Schematics > RF circuit > CB transmitter
CB transmitterTECHNICAL CHARACTERISTICS:
Tendency of catering: + 12V/1A DC
Frequency of emission at AM: ~27MHz
Force of expense: 2,5W
Materially:
The resistances are 1/4W.
| R1 |
10KW |
| R2 |
100KW |
| R3 |
39W |
| R4 |
180W |
| R5 |
4,7KW |
| R6 |
1MW |
| R7 |
3,9KW |
| C1, C9, C10 |
100nF polyester |
| C2 |
33pF ceramic |
| C3 |
470pF ceramic |
| C4 |
4,7nF polyester |
| C5 |
1nF ceramic |
| C6 |
10-60pF trimmer |
| C7 |
220nF polyester |
| C8 |
10mF/25V electrolytic |
| C11 |
47mF/25V electrolytic |
| C12 |
1,5nF ceramic |
| J1, J2, J3 |
VK200 (inductor of high frequencies). |
|
L1, L2 |
Wires of coper (smaltwme'na) with diameter
0,4mm wrapped in plastic support of diameter 6-7mm of perjstrofjkoy' core.
For the L1 you wrap 13 coils. For the L2 you wrap 4 coils. (As in the
receptor CB.) |
| L3 |
Wrap 20 coils cupreous wire of (0,3-0,4mm
diameter) convolution round a resistance 2,2W/2W of coal. |
| Q1, Q2 |
BC108 |
| Q3 |
BD139 |
| Q4 |
2N4427 (it is not replaced) |
| Q5 |
BD329 (or 2N3553) |
| Y1, Y2? |
Crystal hails. (You
can you put the so much, those who also channels that you want you emit).
See
here. |
| MIC |
microphone with
preamplifier. |
| ANT1 |
Aerial for CB (For the trials is enough a piece
wire of few metres but better connects a regular aerial so that does not
have many stagnantly and burns the transmitter). |
| S1 |
(Choice of receptor of - transmitter, if you
combine the transmitter with the receptor CB, you are supplied the receptor
from exit 12V OUT) |
| S2 |
Switch of choice of
channel. It has so much places, those who also the channels that you want
pja'nete.(Kaly'tera he is mechanically connected with the S1 of receptor for
simultaneous change of channels). |
Charge 50W:
Materially:
| R1, R2 |
100W/2W |
| C1 |
47nF ceramic |
| C2 |
4,7nF ceramic |
| J1 |
VK200 (inductor of high frequencies). |
| D1 |
Passage of germanium (AA119 or OA92 or..). |
Regulations:
For the regulation it needs a voltmeter (with needle better) and
charge 50W/5W.
- Connect charge 50W in the place of aerial, with the voltmeter in the
exit voltmeter.
- Be supplied the transmitter with + 12V. It will be supposed we have
consumption between 0,7-1A.
- With a screwdriver we regulate the core of inductor L1/L2 and later the
variable C6 until we see the biggest tendency
- We connect the microphone and speaking we observe the clue in the
multimeter. If all have become right will be supposed the tendency, speaking,
to go up roughly 30-35%.
Title: CB transmitter
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 586
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