FX 146
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48
NOTE ON REPLACEMENT PARTS:
If you lose or damage parts during assembly or testing, you may, of course,
order any needed replacement parts by writing or faxing the Ramsey
Electronics, Inc. factory. Some of the more common parts may also be
picked up at Radio Shack or other local parts distributors. Use EXACT
values when replacing parts. Following is a GENERAL guide to obtaining
parts for your transceiver as quickly as possible:
A
Radio Shack or local electronic parts distributor:
Resistors, electrolytic capacitors, disc capacitors, common NPN or
PNP transistors, Zener diodes, switching diodes, voltage regulator
(5V), hookup wire, LED, controls, antenna connector, replacement
1-amp fuses.
B
Order from RAMSEY ELECTRONICS:
Most RF and VHF transistors, coils, crystals, PIN diodes, varactor
diodes, trimmers, filters and most IC chips.
C
U1 and U6 are Motorola devices
These parts might be in stock at service shops featuring Motorola
equipment. There are acceptable "standard replacements" for some
of the semiconductors used in the transceiver. "SK" and "ECG"
standard replacements are stocked by local electronics parts
distributors or may be ordered through a Radio Shack store. The
following chart should help you make the most cost-effective choice
if replacement semiconductors are needed:
Part ID
Type
Recommended source RE=Ramsey,
RS=Radio Shack
Q1, etc.
2N3904
RS 276-1617
Q12,13,14
PNP 228256
RS276-1604 or 2N3906
Q2, etc.
2SC2498
ECG10, SK9139, 2N5179, or RE
Q3
NE02137
MRF901 or RE
Q9
2N3866
ECG311, SK3195 or RE
Q8
SD1127
MRF237, ECG341, SK9617 or RE
Signal diodes
1N4148
1N914, RS276-1620 (pack of 50)
D3,D23
BB405
RE
D2,D7
BA482
ECG553 or RE
D6
BA389
RE
D18
1N4002
RS276-1102, 1N4003
FX-146
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99
RAMSEY FX-146 VHF FM TRANSCEIVER
KIT ASSEMBLY PHASE 2:
?
Stage G: Understanding and Building the PLL Frequency
Synthesizer
?
Stage H: Building and Programming the Diode Matrixes
?
Stage M: Microphone Amplifier and PTT Circuit
?
Stage "TC": Preparing Transmitter Coils, RF Chokes
?
Stage "TO": Other Transmitter Stage Preparation
?
Stage TX: Transmitter Buffer, Driver and Final
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:
?
Detailed Explanation of PLL Frequency Synthesis
?
How to Program the Synthesizer
?
EASY PLL Alignment Directions
Study the REFERENCE SECTION for additional help and tips on Frequency
Programming.
