HARRIS COMMUNICATIONS RF-590A RF 1310/A RF591A

It is not an easy task to design a highly sensitive radio receiver that also has a wide dynamic range. However this is an important requirement for many radio communications systems, particularly where mobile radio communications units may come into close proximity with each other.

To achieve the required level of performance a number of methods can be used. The front-end stage of the radio receiver is the most critical in terms of noise performance. It should be optimised for noise performance rather than gain. Input impedance matching is critical for this. It is interesting to note that the optimum match does not correspond exactly with the best noise performance. The amplifier should also have a relatively high output capability to ensure it does not overload. The mixer is also critical to the overload performance. To ensure the mixer is not overloaded there should not be excessive gain preceding it. A high level mixer should also be used (i.e. one designed to accept a high-level local oscillator signal). In this way it can tolerate high input signals without degradation in performance. Care should be taken in the later stages of the receiver to ensure that they can tolerate the level of signals likely to be encountered. A good AGC system also helps prevent overloading and the generation of unwanted spurious signals.

A radio receiver with a good dynamic range will be able to give a far better account of itself under exacting conditions than one designed purely for optimum sensitivity. With the exacting requirements needed for today's radio communications systems where mobile radio communications means that transmitters and receivers come into close proximity, good levels of sensitivity are needed along with the ability of the radio receiver to tolerate high signal levels, either on or off channel. Only when the radio receiver has a good dynamic range will the required performance level for the whole radio communications system be achieved.

HARRIS RF 590A RECEIVER

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eciSpecifications for the RF-590A

Specifications are subject to change without notice.

General

Frequency Range  10 kHz to 29.999999 MHz in 1Hz steps

Frequency Stability + 1 part in 10 6– Standard + 1 part in 108– 

Optional External Frequency Standard 1/5/10 MHz, 0.5 VRMS

Channel Memory 100-channel capacity

Modes of Operation

   USB (J3E, A3J), LSB (J3E, A3J),

2-ISB (B8E, A3B) (optional),

      CW (A1A, A1), AM (A3E,A3),

FM (F3E,F3)

Sensitivity For 10 dB (S+N)/N, above 50 kHz

SSB: 0.35 μv

CW: 0.15 μv (300 Hz)

AM: 1.5 μv (6 kHz)

IF Bandwidths 

Mode 3 dB BW (kHz) 

USB   2.8 

LSB    2.8 

CW    0.3

CW    1.0

AM    3.2

AM    6.0

AM/FM 16

Intermodulation

 In Band: –50 dB or better for (2) –7 dBm signals within the IF passband

Out of Band: –50 dB or better for (2) 0 dBm signals separated 30 kHz or more

Reciprocal Mixing ≤ –107dBc in 3 kHz @ ≥ 100 kHz 

separation Image and IF Rejection –100 dB Spurious Rejection Internal ≤ –123 dBm, external –80 dB

Maximum Signal Input

Receiver protected to 100 watts available power input

AGC  Range: < 3 dB audio output variation for 1 μv to 1v input

Attack Time: <20 msec

Hang/Decay Times:

Short, <30 msec.; 

Medium, 200 + 50 msec.;

Long, 2.5 ± .5 sec.

Data BFO + 9.99 kHz in 10Hz steps

Hum and Noise < –50 dB

Ultimate (S+N)/N 50 dB

Audio Outputs Line Output: –16 to +10 dBm/600 ohms

Phone: +10 dBm/600 ohms

Internal Speaker:

2.0 W/8 ohms

External Speaker: 2.5 W/8 ohms

    Environmental

Temperature

Operating: – 10 ̊C to +55 ̊C

Non-Operating: – 62 ̊C to +71 ̊C

Humidity 0 to 95%

\    Installation

Power Supply

115/230 VAC + 20%, 47 to 420 Hz,

Power Consumption 75 watts

Size 5.25”H x 19”W x 19.5”D max

(13.3H x 48.3W x 49.5D cm)

Weight 40 lb (18.2 kg)

Maintaining the Exiter