Kenwood SG-5260 - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The Kenwood SG-5260 is an FM-AM standard signal generator designed for a wide range of applications, from design to manufacturing. It offers stable and accurate signal generation across a broad frequency band and provides various features for ease of use and precise control.

Function Description

The SG-5260 functions as an FM-AM signal generator, capable of producing both frequency-modulated (FM) and amplitude-modulated (AM) signals. It covers a wide frequency range and allows for precise control over output level and modulation parameters. The device supports both internal and external modulation sources, offering flexibility in signal generation. It also includes features for storing and recalling frequently used settings, as well as remote control capabilities.

Important Technical Specifications

Carrier Frequency:
- Possible frequency range: 10 kHz to 260 MHz
- Display: 7 digits
- Resolution: 100 Hz
- Reference signal accuracy: ±2 × 10⁻⁶
- Stability: ±2 × 10⁻⁷/week
RF Output:
- Output level range: -20 dBμ to 132 dBμ (open ended); -133 dBm to 19 dBm (50Ω termination); -134.8 dBm to 17.2 dBm (75Ω termination)
- EMF dBμ → dBm selector switch: Yes
- 50Ω → 75Ω selector switch: Yes
- Display: 4 digits
- Resolution: 0.1 dB
- Reference level accuracy: ±1 dB (RF: 400 kHz to 260 MHz); ±1.5 dB (RF: 10 kHz to 400 kHz)
- Attenuator accuracy: ±1 dB (at 20 dBμ to 132 dBμ); ±1.5 dB (at -10 dBμ to 20 dBμ); ±2 dB (at -20 dBμ to -10 dBμ)
- Signal source impedance: 50Ω or 75Ω, VSWR 1.2 or less (RF: 10 kHz to 130 MHz with 75Ω)
- Spurious output: Harmonics below -30 dB; Sub-harmonics below -35 dB (RF: 10 kHz to 33 MHz); Others below -50 dB (RF: 33 MHz to 260 MHz)
- Residual FM component: 80 dB or more (Deviation: 75 kHz, Band: 300 Hz to 20 kHz, De-emphasis: 50 µs, RF: 76 MHz to 110 MHz)
- Residual AM component: 60 dB or more (Modulation: 30%, Band: 50 Hz to 15 kHz, RF: 400 kHz to 1.7 MHz)
FM Modulation:
- Frequency deviation: 0 to 300 kHz (RF: 3 MHz to 32.9999 MHz, 65 MHz to 260 MHz); 0 to 150 kHz (RF: 33 MHz to 64.9999 MHz); 0 to 30 kHz (RF: 300 kHz to 2.9999 MHz); RF × 10% (RF: 300 kHz or less)
- Display: 3 digits
- Resolution: 0.1 kHz (at 0 to 99.9 kHz); 1 kHz (at 100 kHz or more)
- Accuracy: Maximum display value ±5% (RF: 3 MHz to 260 MHz, AF: 1 kHz)
- Internal modulation frequency: 400 Hz ±3%, 1000 Hz ±3%
- Distortion factor: 0.02% (RF: 10.7 MHz, 76 MHz to 110 MHz); 0.1% (RF: Other ranges) (Demodulation band: 300 Hz to 20 kHz, De-emphasis: 50 µs, 75 kHz deviation, AF: 1 kHz)
- External modulation frequency response: 20 Hz to 100 kHz ±1 dB (1 kHz reference, RF: 76 MHz to 110 MHz); 20 Hz to 100 kHz ±1.5 dB (1 kHz reference, RF: Other ranges) (Separation: 60 dB or more at 1 kHz)
- External modulation input impedance: Approx. 10 kΩ, unbalanced
- External modulation input voltage: Approx. 3 Vp-p
- Incidental AM: 0.5% or less at 75 kHz deviation
AM Modulation:
- Modulation amplitude: 0 to 99.9% (compatible with an open end with up to 124 dBμ output level)
- Display: 3 digits
- Resolution: 0.1%
- Accuracy: Maximum display value ±5% at 0 to 80% modulation amplitude
- Internal modulation frequency: 400 Hz ±3%, 1000 Hz ±3%
- Distortion factor: 0.1% (RF: 400 kHz to 1.7 MHz, Demodulation band: 50 Hz to 15 kHz, Modulation frequency: 1 kHz); 1% (RF: Other ranges, 30% modulation)
- External modulation frequency response: 20 Hz to 20 kHz, ±1 dB (1 kHz reference, RF: 400 kHz to 1.7 MHz range); 20 Hz to 10 kHz, ±1.5 dB (1 kHz reference, RF: other ranges)
- External modulation input impedance: Approx. 10 kΩ, unbalanced
- External modulation input voltage: Approx. 3 Vp-p
- Incidental FM: Less than 75 Hz for 30% modulation by 1 kHz modulation frequency
Other Functions:
- Preset keys: AM (30%, 60%, 99.9%), FM (3.5 kHz, 22.5 kHz, 75 kHz), Output level (4 level ranges selectable)
- Memories: 100 points
- Power requirements: AC 100V/120V/220V ±10% (Max. 250 VAC), 50/60 Hz, Approx. 57W
- Dimensions: 430 (W) × 100 (H) × 380 (D) mm
- Weight: Approx. 11.5 kg
- Operating conditions: 10°C to 35°C, 85% RH or less humidity
- Accessories: Power cord (1), Output cable (1), Replacement Fuses (1), Instruction manual (1)
Options:
- Remote control: The SG-5260 can be remote controlled by the optional RT-101 remote controller.
- GP-IB function: Designed for automation of measuring via GP-IB (factory option).

Usage Features

Easy Setting Input: All set values for frequency, level, and modulation can be easily input using numeric keys or the rotary encoder.
Memory Function: Up to 100 addresses can store frequency, modulation, and output level settings, allowing for quick recall of frequently used configurations.
AF Function: Provides one-touch deviation measurement, useful for observing frequency variations.
Setting Modes: Supports both direct setting via numeric keys and normal setting using a cursor and rotary encoder for precise adjustments.
Modulation Source Selection: Users can select between internal oscillators (400 Hz, 1 kHz) and externally input signals for both FM and AM modulation.
Preset Modulation: Offers preset standard modulation values for AM (30%, 60%, 99.9%) and FM (3.5 kHz, 22.5 kHz, 75 kHz), enhancing operational ease.
Output Level Presets: Four output level ranges can be preset and recalled, simplifying level adjustments.
Output Impedance Toggling: The output impedance can be toggled between 50Ω and 75Ω.
Address Rotation Function: Allows for sequential recall of addresses within a defined range, useful for automated testing.
Back-up Function: Retains the last setting status in memory for approximately three weeks even after the power is turned off.
Display Units: Output level can be displayed in EMF dBμ or dBm, selectable by the user.
Step Setting: Frequency and output level can be adjusted in user-defined steps, providing fine control.
Simultaneous FM/AM Setting: Enables simultaneous application of FM and AM modulation, with a toggle function to display either modulation amplitude or frequency deviation.
RANGE OUTPUT Terminal: Provides a +5V or 0V output depending on the carrier frequency range (above/below 35 MHz), useful for external control or indication.
EXT HIGH/LOW Indicators: These indicators show if the external modulation signal's input level is too high or too low, helping to ensure proper modulation.

Maintenance Features

Fuse Replacement: The manual provides clear instructions for replacing the AC mains protection fuse. It specifies different fuse ratings (0.5A slow blow for 100V/120V, 0.3A slow blow for 220V/240V) and emphasizes disconnecting power before replacement.
Voltage Change: Detailed steps are provided for changing the unit's operating voltage (100V, 120V, 220V, 240V) by adjusting a print sheet under the fuse clip. This procedure also includes instructions for changing the fuse to match the new voltage setting.
Heat Sink: The device is equipped with a heat sink, and the manual advises placing the unit in a well-ventilated location to prevent overheating during continuous operation.
Cord Winder: A cord winder on the rear panel also serves as legs for vertical storage, though vertical operation is not recommended.