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Wavemach FM-3WM Assembly Manual

Linear modulation version (100 khz spacing)

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NOTE: PLEASE READ ALL THE INFORMATION IN THIS MANUAL BEFORE OPERATING.
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
web: http://www.wavemach.com/testing
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Introduction
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tel# (416) 243-2260
email: fm@fmamplifiers.com
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Summary of Contents for Wavemach FM-3WM

  • Page 1 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.
  • Page 2 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# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 3: Frequency Selection

    1.6 MHz 800 KHz 11-8=3 400 KHz 200 KHz 3-2=1 100 KHz 1-1=0 Note: Switch 12 is always in the on position. The final result should look like this: 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 4 90.7 95.8 90.8 95.9 90.9 96.0 91.0 96.1 91.1 96.2 91.2 96.3 91.3 96.4 91.4 96.5 91.5 96.6 91.6 96.7 91.7 96.8 91.8 96.9 91.9 97.0 92.0 97.1 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 5 100.7 106.4 100.8 106.5 100.9 106.6 101.0 106.7 101.1 106.8 101.2 106.9 101.3 107.0 101.4 107.1 101.5 107.2 101.6 107.3 101.7 107.4 101.8 107.5 101.9 107.6 102.0 107.7 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 6 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. 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 7 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. 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 8 1/8 Watt Resistors 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 9 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. 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 10 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 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 11 Small Capacitors 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 12 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 13 Electrolytic Capacitors 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 14 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 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 15 Q1 back view Q1 front view Q5 height above board D1 and D2 D200 LED1 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 16 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 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 17 L11B L12B L13B Height profile for L7B, L11B, L12B and L13B L10 ferrite coil 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 18 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 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 19 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. 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 20 If you level is correctly adjusted you should sound about as loud as other stations. 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 21: Troubleshooting

    DC level on Variactor tuning diodes D1 and D2. D1, D2, L3A and L3B form the VHF tank circuit so it is a good idea to check this area on your board if you still have a problem. 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 22 If using the MAR-6/SM for U4 then R29 is 68 to 220 ohms. If using a Hittite 481 chip for U4 then use 68 ohms for R29 Resistors parts count using the Hittite 481 or MAR6 for U4 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 23 See step 6 for installation details. Table 4 (Capacitors quantities) 2.2pf 5-30 pf 220pf 10uf 8 or 8.2pf 47pf 1000pf 10pf 9-50pf 0.01uf 27pf 100pf 0.1uf 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 24 60 inches not supplied Heat sink For Q5 Black wire 5” Shielded audio wire 10” Red wire 4” LED1 mini coax 50 ohms 8” of RG178 or RG 316 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 25 24K resistor and the RC network. See the photos below for details on this. This modification is also shown in the pink highlighted area in the schematics. Optional input Pre-emphasis network for a mono input 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 26 Pre-emphasis network to optimize the sound for mono audio sources. The schematics should also help in the event that your kit does not work. 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 27 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 28 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...
  • Page 29 320 Dixon Rd #302-Toronto-ON-Canada-M9R 1S8 tel# (416) 243-2260 web: http://www.wavemach.com/testing email: fm@fmamplifiers.com...