FX 146
•
84
?
CR11. Install C8, .1 uf disc capacitor (marked .1 or 104).
?
CR12. Install C13, .1 uf disc capacitor (marked .1 or 104).
?
CR13. Install C14, 27 pf disc capacitor (marked 27).
?
CR14. Install C26, .01 uf disc capacitor (marked .01 or 103).
?
CR15. Install C6, .1 uf disc capacitor (marked .1 or 104).
?
CR16. Install C7, 4.7 or 10 uf electrolytic. Watch polarity (or U1's audio
won't reach U2!) The polarity doesn't always show up on the silkscreen
so consult the pictorial for proper orientation.
?
CR17. Install C13, .1 uf disc capacitor (marked .1 or 104).
?
CR18. Select and install FL2, the rectangular plastic block with 3 thin
pins. It fits only one way. This is the 6 pole, ceramic 455 KHz IF filter
network. Verify that filter FL2 is properly seated and soldered. So far,
most disc capacitors installed have been from your endless supply of .01
and .001 capacitors. If you have not done so already, now would be a
good time to sort and organize all your "picofarad" capacitors, ranging in
value from 2 to 100 pf. Correct selection of these values will be essential
throughout the RF stages of your transceiver.
?
CR19. Install C10, .001 uf. (marked .001 or 102).
?
CR20. Install C15, .01 uf (marked .01 or 103).
?
CR21. Install C12, 47 pf (marked 47).
?
CR22. Select and install Y1, the 21.855 MHz. crystal. It must be snug
on the board before soldering. [Be sure not to confuse Y1 with Y2, the
10.240 MHz. crystal which will set the Reference Frequency for the PLL
Synthesizer, or with FL1, which has 3 wires.]
?
CR23. Install L1, the 455 KHz shielded coil marked LB53303HK. Make
sure it is seated squarely on the board before soldering. Solder all pins.
?
CR24. Install C101, 4.7 or 10 uf electrolytic, observe polarity.
Install these following resistors:
?
CR25. Install R6, 3.3K ohm (orange-orange-red).
?
CR26. Install R8, 47 ohm (yellow-violet-black).
?
CR27. Install R2, 1K ohm (brown-black-red).
?
CR28. Install R1, 220K ohm (red-red-yellow)
FX-146
•
63
KIT ASSEMBLY PHASE 1:
Stage A: DC Power Regulation & Distribution
Plus Packet Data I/O Connector
Stage B: Receiver Audio Amplifier
Stage CR: Integrated Circuit FM Receiver
Stage DR: Receiver, Tuned RF Input and Preamp
Stage E-F: Transceiver VCO with Buffer Stages
Each set of Assembly Instructions is introduced by an explanation of how
that part of the circuit works and what it is for. LEARN as you build!
ALSO INCLUDED IN THIS SECTION:
Master Kit Parts List
Important Information About Kit Parts and the Printed Circuit Board.
TOOLS AND EQUIPMENT REQUIRED FOR CONSTRUCTION, PLL
SYNTHESIZER ALIGNMENT, & TRANSMITTER ADJUSTMENT
?
Medium-heat (25 to 50 watt) soldering pencil with clean, tinned
tip
?
Damp sponge to keep soldering tip clean
?
Thin diameter ROSIN core solder
?
Diagonal cutters or wire nippers
?
Wire strippers
?
Small pair of pliers
?
Small screwdriver
?
Ruler
?
Tweezers (to install SMT C75)
?
Non-metallic alignment tool
?
Digital Voltmeter (DVM)
?
50-ohm Dummy Load (5-10 watt rating)
?
VHF RF power output meter
ALIGNMENT: A feature of the FX design is that Synthesizer Alignment can
be accomplished by listening carefully to a transmitted signal of known
accuracy. To adjust trimmer capacitor C81 "by the numbers," use your
Ramsey Frequency Counter or a digitally accurate VHF receiver with BFO.