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
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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
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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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7

8
1/8 Watt Resistors
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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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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

11
Small Capacitors
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11

12
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12

13
Electrolytic Capacitors
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14
STEP 7 (Refer to Table 6, 7 and 8)
Install the 5 volt regulator U5. Your kit may have a large 7805 or a small 78L05 style regulator for U5.
Install Q1, Q2, Q3, Q5, D1, D2 and D3. Note: D1 and D2 must be flush mounted against the board since
they are part of the VHF oscillator tuned circuit. Install D200 which is the 1N4148 diode and pay attention
to the polarity. Now install LED1 and make sure the flat side is facing the screen printing “LED1”. Also
make sure to pay attention to the polarity of D3. After the board is complete you can insert the heat sink
onto Q5 but wait till you are finished! See the photos for correct installation of all these parts.
Large 7805 regulator
Large 7805 regulator
Small 78L05 regulator
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15
Q1 back view
Q1 front view
Q2
Q3
Q5
Q5 height above board
D1 and D2
D3
D200
LED1
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16
STEP 8 (Refer to Table 5)
Table 5 show the coils used for this board. You have already installed 3 of the coils which are jumpers.
Install a 150 ohm resistor for L1 if you have not already done so. Now install a 10 ohm resistor for L8B if
you have not done this when installing the resistors. L3A and L3B should now be installed and should be
installed around 1/32” above the board surface. I normally insert a drill bit into both of these coils to
keep them aligned while soldering these 2 coils. Note: some kits will require you to wind coils L3A, L3B,
L7B, L11B, L12B, L13B, L200, L201 and L202 as per Table 5 details. Now install coils L4 and L5 as shown
in the photos. You can now install L7B, L11B, L12B, L13B which should be installed around 1/8” above
the surface of the board. L10 is a 3 turn ferrite core and should now be installed. See photos for details.
L3A + L3B aligned with drill bit
L3A and L3B
Side profile of L3A + L3B showing height above board
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16

17
L4
L5
L7B
L11B
L12B
L13B
Height profile for L7B, L11B, L12B and L13B
L10 ferrite coil
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18
STEP 9 (Refer to Table 5)
Insert L200, L201 and L202 into the PCB board and slide a 7/64” drill bit into all 3 coils to help align them
while soldering. These coils should be above the surface around 1/8”.
L200, L201 and L202 alignment
L200, L201 and L202 after soldering
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19
STEP 10 (Refer to Table 5 and 8)
Lx can now be install. This is really the 6.4 MHz crystal in series with a 22 uH molded inductor. See the
photos below for details. Ok, you’re getting near the end! Now install the black and red power wires, 10
inch audio cable, and the mini 50 ohm RF cable. Once installed, you will need to insert the heatsink on
to Q5. You will also need to terminate the mini 50 ohm cable into a VHF power meter. You can use a
through-line meter with a 50 ohm dummy load or a terminating 50 ohm dummy load. A bird 43 is a
popular meter or you can use other meters like a Diawa or a Diamond meter. Some of the really cheap
meters may work but most of them are very inaccurate.
L4 LX and 6.4 MHz crystal in series
Red and black power leads
50 ohm mini coax
10 inch audio cable
Testing and Alignment of the board
Great, you made it to the end but does your board work? Well let’s find out! Now that you have finished
it is a good idea to clean your board. You can use alcohol but I prefer a cleaner made by Nortek called
Clean & Lube. It is my favorite for this but I am sure there are many other good ones. Just use one that
is good for electronic circuit boards. Once you cleaned the board it is a good idea to let things
completely dry for 10 minutes. Also now is a good time to visually inspect your board for possible shorts.
After you do this then continue to step 1 below.
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20
Step 1
Connect your transmitter to a VHF power meter that has a 50 ohm dummy load connected or build-in.
Step 2
Connect the red wire of your transmitter to a 1 amp inline fuse and the other side of the inline fuse to a
15 volt 1 amp or higher regulated DC power supply. You can also use a bench power supply and set the
current limit to 1 amp. This is preferred since then you don’t need the fuse. This transmitter will not
draw more than 1 amp so if you have a direct short the fuse will blow or current limiting of you power
supply will occur.
Step 3
Set all the switches of the dip switch to the off position except switches 11 and 12. This will program the
transmitter to 102.3 MHz. Turn the power control pot VR1 fully clockwise to the maximum power setting.
Step 4
Now turn on your 15 volt DC power supply. The red LED light should come on after around 3 seconds if
your transmitter is locking on frequency. If the LED comes on then adjust C35 and C40 for maximum
power. You should get around 3 watts. Now program the board to around 107 MHz and check to make
sure the LED is on. If so check the power level. If not you may have to stretch the coil L3A and L3B a
bit since stretching it favors the higher frequencies.
Once you see the LED come on, then you should program the unit to around 88 MHz and see if the LED
shows lock. If not you may have to compress L3A and L3B a bit. If set just right you can get the upper a
lower end of the band without the need alter L3A and L3B. Once this test passes you can adjust the
settings of C35 and C40 to give you about the same power level at both the low and high end of the FM
band. The mid frequencies will produce slightly more power if you tune his way. Typically I get around 3
watt at the lower and upper ends of the band and around 3.5 watts in the mid band frequencies. This
will vary slightly with each unit but typically you won’t get much less than 2.5 watts at lower and upper
frequencies. You can also decrease the value of the 5 watt resistor to around 3 ohms to produce more
power. You would typically get over 4 watts by doing this. I do not recommend going lower than 3
ohms since the output transistor would be working even harder and also get hotter.
Step 5
If you have a frequency counter you can use it to tune you frequency exactly by adjusting C2 that is
located beside the 6.4 MHz crystal.
Step 6
Now connect the audio cable to your audio source set to around 2V p-p. Your audio source should have
a low output impedance to drive a 2k load which is what the input impedance of the audio input for the
transmitter is. And earphone or speaker output jack is good for this but a high impedance line level
output has too high an output impedance for this. Any active audio mixer will also do. To test the audio
you need to program a radio to the frequency you have set your transmitter to. If you level is correctly
adjusted you should sound about as loud as other stations.
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20