Wavemach FM-3WM User manual

1
3
3 W WA AT TT T F FM M T TR RA AN NS SM MI IT TT TE ER R A AS SS SE EM MB BL LY Y M MA AN NU UA AL L
L
Li in ne ea ar r m mo od du ul la at ti io on n v ve er rs si io on n ( (1
10 00 0 K KH Hz z s sp pa ac ci in ng g) )
NOTE: PLEASE READ ALL THE INFORMATION IN THIS MANUAL BEFORE OPERATING.
Introduction
The FM-3WM transmitter is a high performance wideband broadcast transmitter board that can
be programmed in 100 KHz steps to transmit on any commercial FM frequency in the 87.5-108
MHz band.
320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# [phone]
web: http://www.wavemach.com/testing email: [e-mail]
1

2
The output power of this unit can be adjusted from around 0-3 watts buy adjusting the RV1
control pot and the unit can be power from a standard 15 volt regulated power supply. Almost
any audio source can be used to modulate the transmitter with around 2 volts P-P audio level.
Modulation can be calibrated by comparing your stations level to that of other stations or using a
modulation meter if you have one.
The input audio connections to the board are soldered on to the pad labeled AUDIO and the side
ground of the board. The DC power input is labeled DC. The only other connection to the board
is the RF OUT. A mini 50-ohm cable is soldered to these pads. The other end of the mini coax
cable must be connected to a antenna or 50 ohm non inductive power resistor to provide a proper
match to the output transistor. If the unit is powered up without correctly terminating the
RF output, damage could occur to the output transistor! Always make sure the unit is
correctly set up before applying power.
Fast lock up circuitry has been used to enable the transmitter to lock on frequency in around 3
seconds. The lock indicator led will indicate if the transmitter is locked when it is lit. If the unit
is not locked the transmitter will not generate an output signal. This could occur if the
transmitter is incorrectly programmed to a frequency out of the oscillator tuning range. If this
occurs it is a good idea to double-check the dipswitch codes.
320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# [phone]
web: http://www.wavemach.com/testing email: [e-mail]
2

3
Frequency Selection
To change the frequency of operation, the dip switch settings must be changed. The switches
control the amount that U1 and U2B divides the incoming frequency. By changing the switch
setting we change the division factor and ultimately the frequency of operation. To set the
frequency follow the format listed below:
Example: Suppose you want to operate on 87.5 MHz.
•Shift the decimal one place to the right-----we now have 875
•Using the chart below, subtract the highest number that is equal to or less than 875. The
chart indicates the highest number is 512-----we now have 363
•Continue until there is nothing left to subtract.
Switch
Division
Frequency
Math operation
Switches that are off
12
----------
-------------
------------------
This switch is always on
11
1024
102.4 MHz
10
512
51.2 MHz
875-512=363
10
9
256
25.6 MHz
363-256=107
9
8
128
12.8 MHz
7
64
6.4 MHz
107-64=43
7
6
32
3.2 MHz
43-32=11
6
5
16
1.6 MHz
4
8
800 KHz
11-8=3
4
3
4
400 KHz
2
2
200 KHz
3-2=1
2
1
1
100 KHz
1-1=0
1
Note: Switch 12 is always in the on position.
The final result should look like this:
1 2 3 4 5 6 7 8 9 10 11 12
ON
OFF
320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# [phone]
web: http://www.wavemach.com/testing email: [e-mail]
3

4
Frequency codes for transmitter (Logic 0 means switch is on)
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
87.0
0
1
1
0
0
1
1
0
1
1
0
0
92.1
1
0
0
1
1
0
0
1
1
1
0
0
87.1
1
1
1
0
0
1
1
0
1
1
0
0
92.2
0
1
0
1
1
0
0
1
1
1
0
0
87.2
0
0
0
1
0
1
1
0
1
1
0
0
92.3
1
1
0
1
1
0
0
1
1
1
0
0
87.3
1
0
0
1
0
1
1
0
1
1
0
0
92.4
0
0
1
1
1
0
0
1
1
1
0
0
87.4
0
1
0
1
0
1
1
0
1
1
0
0
92.5
1
0
1
1
1
0
0
1
1
1
0
0
87.5
1
1
0
1
0
1
1
0
1
1
0
0
92.6
0
1
1
1
1
0
0
1
1
1
0
0
87.6
0
0
1
1
0
1
1
0
1
1
0
0
92.7
1
1
1
1
1
0
0
1
1
1
0
0
87.7
1
0
1
1
0
1
1
0
1
1
0
0
92.8
0
0
0
0
0
1
0
1
1
1
0
0
87.8
0
1
1
1
0
1
1
0
1
1
0
0
92.9
1
0
0
0
0
1
0
1
1
1
0
0
87.9
1
1
1
1
0
1
1
0
1
1
0
0
93.0
0
1
0
0
0
1
0
1
1
1
0
0
88.0
0
0
0
0
1
1
1
0
1
1
0
0
93.1
1
1
0
0
0
1
0
1
1
1
0
0
88.1
1
0
0
0
1
1
1
0
1
1
0
0
93.2
0
0
1
0
0
1
0
1
1
1
0
0
88.2
0
1
0
0
1
1
1
0
1
1
0
0
93.3
1
0
1
0
0
1
0
1
1
1
0
0
88.3
1
1
0
0
1
1
1
0
1
1
0
0
93.4
0
1
1
0
0
1
0
1
1
1
0
0
88.4
0
0
1
0
1
1
1
0
1
1
0
0
93.5
1
1
1
0
0
1
0
1
1
1
0
0
88.5
1
0
1
0
1
1
1
0
1
1
0
0
93.6
0
0
0
1
0
1
0
1
1
1
0
0
88.6
0
1
1
0
1
1
1
0
1
1
0
0
93.7
1
0
0
1
0
1
0
1
1
1
0
0
88.7
1
1
1
0
1
1
1
0
1
1
0
0
93.8
0
1
0
1
0
1
0
1
1
1
0
0
88.8
0
0
0
1
1
1
1
0
1
1
0
0
93.9
1
1
0
1
0
1
0
1
1
1
0
0
88.9
1
0
0
1
1
1
1
0
1
1
0
0
94.0
0
0
1
1
0
1
0
1
1
1
0
0
89.0
0
1
0
1
1
1
1
0
1
1
0
0
94.1
1
0
1
1
0
1
0
1
1
1
0
0
89.1
1
1
0
1
1
1
1
0
1
1
0
0
94.2
0
1
1
1
0
1
0
1
1
1
0
0
89.2
0
0
1
1
1
1
1
0
1
1
0
0
94.3
1
1
1
1
0
1
0
1
1
1
0
0
89.3
1
0
1
1
1
1
1
0
1
1
0
0
94.4
0
0
0
0
1
1
0
1
1
1
0
0
89.4
0
1
1
1
1
1
1
0
1
1
0
0
94.5
1
0
0
0
1
1
0
1
1
1
0
0
89.5
1
1
1
1
1
1
1
0
1
1
0
0
94.6
0
1
0
0
1
1
0
1
1
1
0
0
89.6
0
0
0
0
0
0
0
1
1
1
0
0
94.7
1
1
0
0
1
1
0
1
1
1
0
0
89.7
1
0
0
0
0
0
0
1
1
1
0
0
94.8
0
0
1
0
1
1
0
1
1
1
0
0
89.8
0
1
0
0
0
0
0
1
1
1
0
0
94.9
1
0
1
0
1
1
0
1
1
1
0
0
89.9
1
1
0
0
0
0
0
1
1
1
0
0
95.0
0
1
1
0
1
1
0
1
1
1
0
0
90.0
0
0
1
0
0
0
0
1
1
1
0
0
95.1
1
1
1
0
1
1
0
1
1
1
0
0
90.1
1
0
1
0
0
0
0
1
1
1
0
0
95.2
0
0
0
1
1
1
0
1
1
1
0
0
90.2
0
1
1
0
0
0
0
1
1
1
0
0
95.3
1
0
0
1
1
1
0
1
1
1
0
0
90.3
1
1
1
0
0
0
0
1
1
1
0
0
95.4
0
1
0
1
1
1
0
1
1
1
0
0
90.4
0
0
0
1
0
0
0
1
1
1
0
0
95.5
1
1
0
1
1
1
0
1
1
1
0
0
90.5
1
0
0
1
0
0
0
1
1
1
0
0
95.6
0
0
1
1
1
1
0
1
1
1
0
0
90.6
0
1
0
1
0
0
0
1
1
1
0
0
95.7
1
0
1
1
1
1
0
1
1
1
0
0
90.7
1
1
0
1
0
0
0
1
1
1
0
0
95.8
0
1
1
1
1
1
0
1
1
1
0
0
90.8
0
0
1
1
0
0
0
1
1
1
0
0
95.9
1
1
1
1
1
1
0
1
1
1
0
0
90.9
1
0
1
1
0
0
0
1
1
1
0
0
96.0
0
0
0
0
0
0
1
1
1
1
0
0
91.0
0
1
1
1
0
0
0
1
1
1
0
0
96.1
1
0
0
0
0
0
1
1
1
1
0
0
91.1
1
1
1
1
0
0
0
1
1
1
0
0
96.2
0
1
0
0
0
0
1
1
1
1
0
0
91.2
0
0
0
0
1
0
0
1
1
1
0
0
96.3
1
1
0
0
0
0
1
1
1
1
0
0
91.3
1
0
0
0
1
0
0
1
1
1
0
0
96.4
0
0
1
0
0
0
1
1
1
1
0
0
91.4
0
1
0
0
1
0
0
1
1
1
0
0
96.5
1
0
1
0
0
0
1
1
1
1
0
0
91.5
1
1
0
0
1
0
0
1
1
1
0
0
96.6
0
1
1
0
0
0
1
1
1
1
0
0
91.6
0
0
1
0
1
0
0
1
1
1
0
0
96.7
1
1
1
0
0
0
1
1
1
1
0
0
91.7
1
0
1
0
1
0
0
1
1
1
0
0
96.8
0
0
0
1
0
0
1
1
1
1
0
0
91.8
0
1
1
0
1
0
0
1
1
1
0
0
96.9
1
0
0
1
0
0
1
1
1
1
0
0
91.9
1
1
1
0
1
0
0
1
1
1
0
0
97.0
0
1
0
1
0
0
1
1
1
1
0
0
92.0
0
0
0
1
1
0
0
1
1
1
0
0
97.1
1
1
0
1
0
0
1
1
1
1
0
0
320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# [phone]
web: http://www.wavemach.com/testing email: [e-mail]
4

5
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
97.2
0
0
1
1
0
0
1
1
1
1
0
0
102.9
1
0
1
0
0
0
0
0
0
0
1
0
97.3
1
0
1
1
0
0
1
1
1
1
0
0
103.0
0
1
1
0
0
0
0
0
0
0
1
0
97.4
0
1
1
1
0
0
1
1
1
1
0
0
103.1
1
1
1
0
0
0
0
0
0
0
1
0
97.5
1
1
1
1
0
0
1
1
1
1
0
0
103.2
0
0
0
1
0
0
0
0
0
0
1
0
97.6
0
0
0
0
1
0
1
1
1
1
0
0
103.3
1
0
0
1
0
0
0
0
0
0
1
0
97.7
1
0
0
0
1
0
1
1
1
1
0
0
103.4
0
1
0
1
0
0
0
0
0
0
1
0
97.8
0
1
0
0
1
0
1
1
1
1
0
0
103.5
1
1
0
1
0
0
0
0
0
0
1
0
97.9
1
1
0
0
1
0
1
1
1
1
0
0
103.6
0
0
1
1
0
0
0
0
0
0
1
0
98.0
0
0
1
0
1
0
1
1
1
1
0
0
103.7
1
0
1
1
0
0
0
0
0
0
1
0
98.1
1
0
1
0
1
0
1
1
1
1
0
0
103.8
0
1
1
1
0
0
0
0
0
0
1
0
98.2
0
1
1
0
1
0
1
1
1
1
0
0
103.9
1
1
1
1
0
0
0
0
0
0
1
0
98.3
1
1
1
0
1
0
1
1
1
1
0
0
104.0
0
0
0
0
1
0
0
0
0
0
1
0
98.4
0
0
0
1
1
0
1
1
1
1
0
0
104.1
1
0
0
0
1
0
0
0
0
0
1
0
98.5
1
0
0
1
1
0
1
1
1
1
0
0
104.2
0
1
0
0
1
0
0
0
0
0
1
0
98.6
0
1
0
1
1
0
1
1
1
1
0
0
104.3
1
1
0
0
1
0
0
0
0
0
1
0
98.7
1
1
0
1
1
0
1
1
1
1
0
0
104.4
0
0
1
0
1
0
0
0
0
0
1
0
98.8
0
0
1
1
1
0
1
1
1
1
0
0
104.5
1
0
1
0
1
0
0
0
0
0
1
0
98.9
1
0
1
1
1
0
1
1
1
1
0
0
104.6
0
1
1
0
1
0
0
0
0
0
1
0
99.0
0
1
1
1
1
0
1
1
1
1
0
0
104.7
1
1
1
0
1
0
0
0
0
0
1
0
99.1
1
1
1
1
1
0
1
1
1
1
0
0
104.8
0
0
0
1
1
0
0
0
0
0
1
0
99.2
0
0
0
0
0
1
1
1
1
1
0
0
104.9
1
0
0
1
1
0
0
0
0
0
1
0
99.3
1
0
0
0
0
1
1
1
1
1
0
0
105.0
0
1
0
1
1
0
0
0
0
0
1
0
99.4
0
1
0
0
0
1
1
1
1
1
0
0
105.1
1
1
0
1
1
0
0
0
0
0
1
0
99.5
1
1
0
0
0
1
1
1
1
1
0
0
105.2
0
0
1
1
1
0
0
0
0
0
1
0
99.6
0
0
1
0
0
1
1
1
1
1
0
0
105.3
1
0
1
1
1
0
0
0
0
0
1
0
99.7
1
0
1
0
0
1
1
1
1
1
0
0
105.4
0
1
1
1
1
0
0
0
0
0
1
0
99.8
0
1
1
0
0
1
1
1
1
1
0
0
105.5
1
1
1
1
1
0
0
0
0
0
1
0
99.9
1
1
1
0
0
1
1
1
1
1
0
0
105.6
0
0
0
0
0
1
0
0
0
0
1
0
100.0
0
0
0
1
0
1
1
1
1
1
0
0
105.7
1
0
0
0
0
1
0
0
0
0
1
0
100.1
1
0
0
1
0
1
1
1
1
1
0
0
105.8
0
1
0
0
0
1
0
0
0
0
1
0
100.2
0
1
0
1
0
1
1
1
1
1
0
0
105.9
1
1
0
0
0
1
0
0
0
0
1
0
100.3
1
1
0
1
0
1
1
1
1
1
0
0
106.0
0
0
1
0
0
1
0
0
0
0
1
0
100.4
0
0
1
1
0
1
1
1
1
1
0
0
106.1
1
0
1
0
0
1
0
0
0
0
1
0
100.5
1
0
1
1
0
1
1
1
1
1
0
0
106.2
0
1
1
0
0
1
0
0
0
0
1
0
100.6
0
1
1
1
0
1
1
1
1
1
0
0
106.3
1
1
1
0
0
1
0
0
0
0
1
0
100.7
1
1
1
1
0
1
1
1
1
1
0
0
106.4
0
0
0
1
0
1
0
0
0
0
1
0
100.8
0
0
0
0
1
1
1
1
1
1
0
0
106.5
1
0
0
1
0
1
0
0
0
0
1
0
100.9
1
0
0
0
1
1
1
1
1
1
0
0
106.6
0
1
0
1
0
1
0
0
0
0
1
0
101.0
0
1
0
0
1
1
1
1
1
1
0
0
106.7
1
1
0
1
0
1
0
0
0
0
1
0
101.1
1
1
0
0
1
1
1
1
1
1
0
0
106.8
0
0
1
1
0
1
0
0
0
0
1
0
101.2
0
0
1
0
1
1
1
1
1
1
0
0
106.9
1
0
1
1
0
1
0
0
0
0
1
0
101.3
1
0
1
0
1
1
1
1
1
1
0
0
107.0
0
1
1
1
0
1
0
0
0
0
1
0
101.4
0
1
1
0
1
1
1
1
1
1
0
0
107.1
1
1
1
1
0
1
0
0
0
0
1
0
101.5
1
1
1
0
1
1
1
1
1
1
0
0
107.2
0
0
0
0
1
1
0
0
0
0
1
0
101.6
0
0
0
1
1
1
1
1
1
1
0
0
107.3
1
0
0
0
1
1
0
0
0
0
1
0
101.7
1
0
0
1
1
1
1
1
1
1
0
0
107.4
0
1
0
0
1
1
0
0
0
0
1
0
101.8
0
1
0
1
1
1
1
1
1
1
0
0
107.5
1
1
0
0
1
1
0
0
0
0
1
0
101.9
1
1
0
1
1
1
1
1
1
1
0
0
107.6
0
0
1
0
1
1
0
0
0
0
1
0
102.0
0
0
1
1
1
1
1
1
1
1
0
0
107.7
1
0
1
0
1
1
0
0
0
0
1
0
320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# [phone]
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5

6
KIT ASSEMBLY
Note 1: refer to the photos for proper orientation of the chip, electrolytic capacitors and any
other components that require proper orientation.
Note 2: Coil L4 and L4B are the same coil. The reason for the 2 different printed part designations is
because one was to indicate a surface mount type and the other type was for a large hand wound coil.
Anywhere in the manual referring to L4B is really the same as L4. This also holds true for L6B and L6;
L7B and L7; L8B and L8; L9B and L9; L11B and L11; 12B and L12; L13B and L13.Also U2B and U2 are
the same IC but for different package styles of this chip. Only U2B is used in this kit.
STEP 1 (Refer to Table 7)
Start by installing the dual modulas prescaler U2B, the small gain block amp U4, and the small transistor
Q4B. These 3 parts are small so be careful not to lose them! See the 3 photo below.
STEP 2 (Refer to Table 5)
Install all the jumpers on the board exactly as shown in the photos. You will notice that jumpers are also
used for L2, L6B and L9B. The Jumpers can be any cut off pieces from resistors or caps or other
components or #20 or #22 wire if you have some handy. The wire gauge is not critical. In total there
are 12 jumpers. 6 jumpers are installed on the top side of the board and 6 jumpers are installed from
the bottom side of the board. Solder all the jumpers and clip their leads. See photos for details.
102.1
1
0
1
1
1
1
1
1
1
1
0
0
107.8
0
1
1
0
1
1
0
0
0
0
1
0
102.2
0
1
1
1
1
1
1
1
1
1
0
0
107.9
1
1
1
0
1
1
0
0
0
0
1
0
102.3
1
1
1
1
1
1
1
1
1
1
0
0
108.0
0
0
0
1
1
1
0
0
0
0
1
0
102.4
0
0
0
0
0
0
0
0
0
0
1
0
108.1
1
0
0
1
1
1
0
0
0
0
1
0
102.5
1
0
0
0
0
0
0
0
0
0
1
0
108.2
0
1
0
1
1
1
0
0
0
0
1
0
102.6
0
1
0
0
0
0
0
0
0
0
1
0
108.3
1
1
0
1
1
1
0
0
0
0
1
0
102.7
1
1
0
0
0
0
0
0
0
0
1
0
108.4
0
0
1
1
1
1
0
0
0
0
1
0
102.8
0
0
1
0
0
0
0
0
0
0
1
0
108.5
1
0
1
1
1
1
0
0
0
0
1
0
320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# [phone]
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6

7
Jumpers on the top side of the board
Jumpers on the bottom side of the board
STEP 3 (Refer to Table 1 and 2)
Next install all the small 1/8 watt resistors. Table 1 indicates the value and location of the resistors and
Table 2 indicates the quantity of resistors used for this board. It is a good idea to refer to table 2 first
and pick out the quantity of one value first and then install them. This way you can make sure you have
installed all the resistors of that value without missing any. For example in Table 2 you see there are
three 10 ohm resistors used and in table 1 you can see that the 10 ohm resistors are for R22 and R36 but
there is one missing in Table 1 since this other 10 ohm resistor goes in a spot designated for coil L8B and
is indicated in the Table 5 for the coils. There is one other resistor that is found in the coil Table 5 and
that is a 150 ohm resistor which is used for L1. Also there is one more 150 ohm resistor used near Q4B
that is not shown in table 1. This is not indicated in Table 1 because there is no screen printing on the
board for that resistor. You should insert the 5K pot which is RV1 and 12 position dip switch together
before soldering them since they are very close together. The 5 watt resistor R38 should be installed
around 1/16” above the board. See photos for installation details.
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web: http://www.wavemach.com/testing email: [e-mail]
7

8
1/8 Watt Resistors
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8

9
STEP 4 (Refer to Table 7)
Install IC sockets for U3 and U7. These chips can be now or inserted into the sockets but be careful not
to install them the wrong direction. See photos for details.
STEP 5 (Refer to Table 7)
Install IC U1 which is the large 28 pin chip. Please see the photo for proper orientation of this chip.
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9

10
STEP 6 (Refer to Table 3 and 4)
Install all the small capacitors first. Refer to Tables 3 and 4 and follow the same procedure as used for
the resistors in step 3. Also be careful to pay attention to the correct installation of the 10 uF electrolytic
capacitors since they have a polarity that you must adhere to. See photos below for details on their
correct installation. Note: one of the 47 pF capacitors will be installed under the board in parallel with
trimmer C35. Also there are 2 x 10 pf caps and a 47 pf cap that do not have designated spots on the top
of the board and need special attention. The 3 capacitors are all close to each other and are very close to
Q4B. You will need to scrape a bit of the green coating off the board with a sharp knife to install one of
the 10 pF caps. See photos below for details on where to scrape the board.Also refer to the photos for
the correct installation of the other 10 pf cap which shares a through-hole with C49 a 47pf cap. It is a
good idea to insert these 2 caps together before soldering. Finally refer to the photos below to see
where to install the other 47 pF capacitor which does not have designated screen printing on the board.
47 pF cap under trimmer C35
Scrape board in the circle area
Appearance after scraping
Appearance after cap installed
47 pF cap
Other 47 and 10 pF caps
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10