High performance wide band all mode receiver with "Cyber Scan"

10kHz - 2600MHz
AM, FM, USB, LSB & CW
1000 channels (100 X 10 banks)

For Reference...... AR5QRG.PDF (14kB)

AR5000...

A TCXO forms the building block which is fitted as standard to ensure a very high degree of stability, provision is made to feed the AR5000 from an external 10MHz reference signal should one be available (commercial organizations etc.). A Numeric Controlled Oscillator(NCO) provides smooth tuning with steps right down to 1Hz. The receive circuitry is a triple conversion superheterodyne with I.F.s* of 622MHz, 10.7MHz & 455kHz. Multiple switchable I.F. bandwidth are available in both the 10.7MHz and 455kHz I.F. stages: 3kHz, 6kHz, 15kHz, 30kHz, 110kHz, & 220kHz with provision for an optional 500Hz Collins mechanical filter.

The AR5000 is housed in a newly designed solid metal cabinet and is powered from supplied external 12V DC power unit but may be operated from any regulated supply or battery capable if providing 12-16V@ 1A. Antenna input is via high quality N-TYPE connector with a second SO239 connector which is switchable manually or automatically from the front panel. A switchable preamplifire is employed plus a switchable 10dB attenuator, this may be configured as "auto" so that the receiver selects the optimum setting automatically.

The 1000 memory channels (10banks x 100 channels), 20 search banks with auto-memory store and total of 2100 PASS frequencies are provided with data stored by EEROM so that no external supply, battery or capacitor is required for data retention. Scanning and search speed is a very respectable maximum of 45 channels or increments per second in "Cyber Scan".

A meaningful & detailed auto-mode bandplan has been preprogrammed (specific to each market area) so that operation is straight forward and quick. Should you wish, auto-mode may be easily canceled by selecting a different step size or mode. A special Frequency Offset facility plus step adjust has been provided to simply DUPLEX frequency monitoring and for tracking unusual and plans. A wide variety of search and scan types are available including memory scan, select scan (your temporary favorite frequency notepad!), mode scan, bank scan, pause scan, search link etc. The squelch to may be configured for noise, signal level, audio level etc.

Audio low pass and high pass filters may be configured and are switchable around the following frequencies; LPF 3kHz, 4kHz, 6kHz,& 12kHz, HPF 0.05kHz, 0.2kHz, 0.3kHz & 0.4kHz. De-emphasis is also selectable: THRU, 25uS, 50uS, 75uS & 750uS. A DTMF decoder is provided to display DTMF characters in use with optional CTCSS board to display the CTCSS frequency. A front panel accessory socket provides audio break-out / return for use with external signal processing units, detector output with switching control for tape recorders.

A large rear illuminated segmented Liquid Crystal Display provides a wealth of operating detail including frequency, mode, AGC, etc. but also displays up to 7 alpha-numeric text characters so that comments may be entered to accompany memory channels & search banks to aid easy identification and retrieval of data. Two tuning controls are provided: the main knob provides tuning steps from 1Hz to 999.999kHz and has mechanical variable torque adjustment ideal for fine tuning such as SSB applications, second is click-indented ideal for channel tuning and provides switchable step sizes of 100Hz, 1kHz, 10kHz, 100kHz, 1MHz, and x10 for rapid tuning. An analogue S-meter provides easy to see relative signal strength. Other useful facilities include a built-in dual time clock 12hr/24hr with On/Off timer, sleep and alarm, variable beep tone... plus much, much more!

Extensive facilities are available via RS-232C port which is standard on the AR5000. Output terminals are provided for an external speaker, headphones & transmit mute. Provision has been included for an optional built-in signaling unit, external antenna switching unit plus CTCSS and plus other decoder options.

The AR5000 is ready to plug straight into the optional SDU5000 spectrum display unit for "real time" band occupancy evaluation and measurements in both frequency and dBm signal level. The 10.7MHz I.F. output of the AR5000 has a suitable 10MHz bandwidth ideally matched to the SDU5000.
(note: a microprocessor upgrade may be necessary to the SDU5000)

AR5000+3

Feature enhanced wide band receiver

Synchronous AM
Automatic Frequency Control
Noise Blanker

1. Synchronous AM

Synchronous AM is a useful tool to help reduce distortion due to selective fading, in particular on the short wave bands (long & medium wave bands too). In synchronous AM, original carrier is phase locked to a stable internally generated synthetic reference which is used to replace the (variable) original carrier resulting in more stable reception with greater recovered audio, especially during deep fades. A wide lock range is provided by this detector to enable simple, quick & efficient operation (unlike some other synchronous units on the market which require extremely accurate tuning).

AM transmissions are constructed of a carrier and both upper & lower sidebands. Usually both side bands carry the same information so both or either may be selected with the same recovered resulting audio, however when adjacent interference is present, selecting synchronous single side (SAL or SAH) can provide improved results.

2. Automatic Frequency Control (A.F.C.)

Automatic frequency control is a "global" facility, either OFF or ON (default is OFF). When, A.F.C. is used in AM, FM and synchronous AM modes, the receiver is automatically tuned on to the center frequency to provide the best signal strength and recovered audio. When used in synchronous AM modes, AFC ensures that the signal is pulled within lock range for no-fuss operations. AFC is particularly useful on the VHF-UHF bands to ensure that the AR5000 is receiving spot on frequency, especially when searching through unusual bband plans or when the exact band plan is not known.

3. Noise Blanker

The Noise blanker is another "global" facility, either OFF or ON (default OFF). This facility is particularly useful to help reduce impulse noise and interference from vehicles ignition systems, whether from passing traffic or while the AR5000 is fitted into a mobile installation.

SWITCHED EPROM BANKS - 2000 memories

The facility of switching EPROM banks is now supported, this virtually means that the AR5000 now has 2000 memory channels, 40 search banks, 10 VFOs etc. ... two sets in one!!