Ramsey Electronics FX-440 Manual page 43

-:X:-SERIES TRANSCEIVER GLOSSARY
• ·he following is a deliberately INFORMAL collection of:
Technical terms useful to know in understanding your FX- transceiver
design.
- Acronyms (phrases expressed by first letters of words (example: PLL
=
Phased Locked Loop)
- Selected Electronics-Industry "jargon"
Any of these words or expressions might be used in this instruction
manual or in conversation related to your FX- transceiver, either with
·· -ither hams or with Ramsey technicians. These descriptions or notes for a
·ery few terms certainly are not an •electronics dictionary,• but the
J.uthor/compiler hopes that they might enhance your grasp of the
concepts and language that he has seen as useful in building and using
'his transceiver. For more detail, PLEASE study the introductory part of
iach assembly Stage.
ADDER = Anybody who can add can be called an "adder.• If
we
delegate such work to
.. electronic devices, the most fundamental digital operation after being in a binary high or low
on or off) state is to be able to find the sum of such states from
two
or more sources. The
llNARY ADDER performs this function. See also: BINARY.
AFSK = "Audio Frequency Shift Keying.• [SEE: "FSK"] In short, this is a very popular
form of data transmission
~XIAL-LEAD
= Wires stretch out from
two
opposite ends of a part instead of from one end,
.. e. along the "axis" of the body. For example: L20.
BA- = Manufacturer's PREFIX for PIN-type diodes.
!ASIC = "Basic.• We're talking about the one computer programming procedure that
_;hould make sense to ALL computer owners. If any further explanation is needed, visit a
library or computer dealer.
JB-
= Manufacturer's PREFIX for VARACTOR diodes.
llNARY = the number system based on the
two
values of O and 1. Here's all the tables
that we need to memorize:
o
+
O = O O
+
1 = 1 1
+
1 = 0, and carry 1 to next position.
)ee also: DECIMAL.
~OARD
= Generally refers to
•pc
board" or "printed circuit board."
BUFFER = An electronic circuit stage, a sort of •referee" that tells its input and output not
o mess with each other. Think about such a taskl It may also provide amplified output of
he incoming signal.
CASCADE, cascading = combining
two
or more identical circuit elements or components
for improved effectiveness.
;ARRI ER·= Transmitted RF signal that
is
NOT "modulated.• It
is
a heard as a steady tone
>n BFO-equipped receivers or as a powerful silence (i.e. over-riding all background noise or
hiss) on FM receivers.
':CW = see CW below.
;QR = "Carrier Operated Relay,• a switching circuit activated
by
the detection of a carrier
signal in a receiving circuit.
X-440
Ref. 41