SDU-5500

The SDU5500 is an 'all new' Spectrum Display Unit and a worthy successor to the SDU5000 (which offered practical and cost effective monitoring). It has never been so easy to locate those brief elusive transmissions, coupled to the AR5000 receiver, the SDU5500 provides a spectrum display of 10 MHz bandwidth anywhere between 10 kHz and 2600 MHz.

Already pressed into commercial usage by government departments, the professionalism of the unit has truly been grasped. T he SDU5500 has a high resolution monochrome 4.7inch (white/blue) LCD with improved status read-out on the top-half of the display, a spin wheel tuner controlling the marker position and on-screen programming similar to a dedicated high-priced spectrum analyser. There are six program keys in addition to the ten-key pad. It gets even better... compared to its predecessor, several new facilities have been provided:

• Step resolution mode, plots the wanted channel steps and ignores the gaps for more efficient analysis.

• Channel step mode, plots the wanted channels for close in use on channelised bands.

• Spectrum mode is of course available wàth peak, max, average etc.

• On screen support for AOR AR500015000+3, AR3000A, ICOM IC-R7100, IC-R8500, IC-R9000 and 'Other' companion radio.

Frequency accuracy is typically around +/- 600Hz with a usable dynamic range of 50dB and acceptable input level between -10dB to -90dB with selectable gain control. The SDU5500 truly adds a variety of features to extend your receiver's capabilities, such as visually identifying new active frequencies and taking measurements. Multiple process functions allow average level, peak detection, maximum hold and much more. The SDU5500 may be connected directly to a computer for hands-off control. Built-in support is provided for a number of AOR and ICOM receivers which have a 10.7 MHz I.F. output (AOR AR5000/+3, AR3000A and ICOM R7100, R8500 & R9000).

A spectrum bandwidth up to +/- 5 MHz in 1 kHz increments is provided with a resolution of 5 kHz or 30 kHz. In particular, when using selected AOR and ICOM receivers, the frequency, mode (& attenuator with some sets) may be controlled from the SDU5500. The SDU5500 may also be used with receivers which have an I.F. output 'close' to 10.7MHz (in the range 5.7 to 15.6 MHz with reduced bandwidth) such as the Kenwood TS870S where the SDU5500 makes an excellent companion band scope so that adjacent channel activity may be constantly monitored. Powered from 12V DC means that these advanced facilities may be taken almost anywhere, especially useful for short term on-site applications.

• Menu driven operation: All facilities are within easy access through each dedicated function key and on-screen menu.

• Full interconnection with the AR5000: The ARS000 can be operated from the SDU5500 enabling selection of centre frequency, receive mode, etc. Any frequency spotted and monitored by the SDUS500 can be received by the ARS000 straight away.

• Direct reading of the receiving frequency and input level: By placing the cursor on any spot frequency you can read its frequency and input level on screen. When conneded with the AR5000 the SDU5500 virtually works as a spectrum analyser over 10 kHz to 2600 MHz range as the centre frequency always becomes the receive frequency.

• Wide spectrum coverage: The SDU5500 covers a maximum of +/-5 MHz spread against the input frequency.

• Dual frequency resolution: Selectable, either 5kHz or 30kHz resolution.

• Wide input range: -10dBm to -90dBm by using two selectable gain settings.

• Highly accurate frequency management: Through the DDS controlled local oscillator circuit.

• Wide variety of displays: Graphical display and statistical analysis.

• Remote control via PC: All keyboard operations of the SDU5500 can be mimicked by PC.

• Ready-to-go: Supplied with 9-9 pin radio connector for the AR5000, BNC-BNC patch lead (either DC lead or suitable AC power unit depending upon world market area) and operating manual.

• Compatibility with non-AOR radios: Any radios which are equipped with a 10.7 MHz I.F. output can work with SDU5500. Sweep direction is selectable depending on the heterodyne configuration of the radio. Sweep span may be narrower subject to the I.F. characteristics of the radio.