Ramsey Electronics FZ-146 Specifications download pdf (Page 43)

FX-146 • 43

magic number (decimal) to understand in FX binary frequency programming.

N = the frequency in KHz divided by 5 KHz.

NBFM = "Narrow-Band FM." NE- = prefix to transistors or IC's made by

Signetics, Inc.

OFFSET = The distance in KHz or MHz of the transmitted signal from the

primary or received signal. The "TX Offset" may be higher or lower,

depending on the repeater setup or other application.

OP-AMP = "Operational Amplifier," a high performance linear amplifier with

an Inverting input, a Non-inverting Input and one Output.

ORIENT, orientation = Yes, the Orient is Marco Polo's Far East where they

build many FM radios and where we buy many common parts. When we

ask you to "orient" a kit part one way or the other, we're just asking you to

get it RIGHT -- per all the "orientation" illustrations that we provide.

PACKET = Rapid transmission of intelligible computer generated data in

groups or bursts of a fixed length called "packets."

PHASE DETECTOR = In a frequency synthesizer, the phase detector

compares the signal from a reference oscillator to the signal from a

programmable counter and sends a corrected control voltage to the L-C

section of a VCO. Thus, it can be considered a phase "corrector." See also:

VCO, PLL, VARACTOR.

PLATED-THROUGH = Refers to a style of PC board manufacturing in which

traces on both sides of the board are interconnected by a coating of solder

around the inside of each hole.

POLARITY = Refers to the "+" and "-" sides of batteries, power supplies,

power cables, electrolytic capacitors, etc.

PLL = "Phase-Locked Loop," a frequency generator circuit in which an

oscillator output is analyzed by counters and a phase detector which

controls and corrects the voltage supplied to varactor diode(s) which

determine oscillator frequency.

POT = jargon for "potentiometer", a variable resistor, either a panel control

or a "mini" device on a PC-board.

PRESCALE, Prescaler = a circuit or device which divides an incoming

frequency down to a lower frequency so that it can be handled more easily

by later digital counting circuitry or devices.

PTT = "push to talk", referring to all switches and circuitry involved in turning

a transmitter on and off from a switch usually built into a microphone. This

switch may also be a relay or transistor in a packet TNC, etc.

PUFF = No, not the magic dragon. It's an easier way to say "picofarads" in

the Ramsey warehouse and other high tech temples.

QUADRATURE = Refers to the Phase Angle (90 degrees) considered by

the FM discriminator or detector.

REFERENCE FREQUENCY = a precise, known frequency, usually crystal-

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Ramsey Electronics FZ-146 Specifications Page 43