8525B/8528 Technical Service Manual General Information 1-17
Publication No: 15-02036 Issue 6
POT Potentiometer
PP Peak to Peak
PPM Parts per Million
PROM Programmable Read Only Memory
PSU Power Supply Unit
PTC Positive Temperature Coefficient (Resistor)
PTT Push To Talk
PUT Programmable Unijunction Transistor
PWM Pulse Width Modulation
RAM Random Access Memory
R/C Remote Control
RC Resistance-Capacitance
RCU Remote Control Unit
REF Reference
REG Regulated, Register
RF Radio Frequency
RFI Radio Frequency Interference
RMS Root Mean Square
ROL Reference Operating Level
ROM Read Only Memory
RTL Resistor Transistor Logic
RTTY Radio Teletype
Rx Receive, Receiver
S/C Short Circuit
S/N Signal To Noise
(S+N)/N Signal Plus Noise to Noise Ratio
SCF Suppressed Carrier Frequency
SCR Silicon Controlled Rectifier
SINAD Signal + Noise + Distortion to Noise + Distortion Ratio
SMPS Switching Mode Power Supply
SOT Select On Test
SPDT Single Pole Double Throw
SPST Single Pole Single Throw
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