More Details About The Remarkable Features Of The Ar5001D; High Frequency (45.05 Mhz) If Output; High Stability Frequency Standard; Dds (Direct Digital Synthesizer) - AOR AR5001D Operating Manual

where they may be intensely monitored.
When examining large frequency segments, it is common to find that 90% of the
frequencies are inactive and only a small number of the remaining constitute what
you really want. Searching still remains the best way to initially locate active and
interesting transmissions (in conjunction with a good frequency listing and band
plan).
SCAN: Once active transmissions have been identified (either by searching or by
using a good frequency guide), it is more efficient to store the data into memories
which can be rapidly and automatically monitored in succession, stopping when
activity is encountered. This is a much more efficient means of monitoring the
most wanted frequencies as you have targeted 100% o f what you most want to hear.
By contrast, searching is very inefficient for day-to-day monitoring.
Note: For the search & scan functions to operate properly, it is very important
to advance the squelch to cancel background noise. This is because the
AR5001D believes that it has found an active frequency when the squelch opens
and the "BUSY" indicator lights up. Advance the squelch control clockwise until
the background noise is just cancelled; this is known as the "threshold" position.
If the squelch control is advanced too far, weaker signals may be missed.

More details about the remarkable features of the AR5001D

High frequency (45.05 MHz) IF output

The AR5001D has a 45.05 MHz analog IF output with 15 MHz bandwidth. The input signal to the 45.05
MHz IF stage is directly sent to the A/D converter for digital processing. This IF output signal may be
suitab le as an RF front end for radio signal analysis applications.

High Stability Frequency Standard

When a n optional GPS unit is connected , the inte rnal refere nce oscillator (10 MHz) will be locked by the
GPS receiver, and the highest stability reference signal (0.01 ppm) will be obtained. This is ideal for
frequency coherent operation and DF (Direction Finding) applications.

DDS (Direct Digital Synthesizer)

The AR5001D uses a high speed DDS for the 1
Lo op) c ircuit for the local oscillator, the DDS enables very high speed scanning as it generates signals
instantaneously, controlled by the CPU (Micro Processor).
I/Q Digital Ou tput (Optio nal)
st
local oscillator. Unlike a standard PLL (Phased Locked
9