Leader LG 3238 AM/FM Stereo Signal Generator
- Price: $5,494.95
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The Leader LG 3238 RDS Standard Signal Generator generates AM, FM, CW, and simultaneous AM/FM signals in the frequency range of 100 kHz to 140 MHz, as well as FM and CW signals in the 162-163 MHz range. The cost-effective, highly stable signal generator features monaural FM and AM functions and an FM stereo modulator that complies with FM stereo broadcast standards. The LG 3238 can be used as an automation device for the manufacturing and inspection of AM and FM receivers and other electronic components, and it can also be used as a signal generator for research and development or for servicing electronics.
The LG 3238 produces synthesized, accurate radio frequency signals that are phase-locked at all times to an internal reference crystal oscillator. Fundamental oscillation is used to generate many frequencies (70-140 MHz and 162-163 MHz), and others are derived from these using either the heterodyne method (100 kHz - 35 MHz) or the 1/2-frequency division method (35-70 MHz). Frequency resolution is 100 Hz.
The generator can apply frequency modulation and amplitude modulation simultaneously, in order to combine internal modulation signals with one external modulation signal.
The output level can be set to a value from -20 dBμV (emf) to 126 dBμV (emf) in 0.1 dB steps. With the exception of the use of a relay to switch to 106 dBμV (emf), a solid-state attenuator is used to switch the output levels in order to extend the generator's service life.
The ΔF function can be used to get a direct reading of how much the frequency is offset from the reference frequency. The frequency can be changed in preset steps. Likewise, the ΔdB function can be used to get a direct reading of how much the output level is offset from the reference level. Like the frequency, the output level can be changed in preset steps.
A preset function allows the user to store 100 sets of frequency, output level, modulation mode, and external-control output-signal settings. Front-panel settings are retained when the power is turned off, and restored when the unit is turned back on. Remote control is possible via RS-232C, GP-IB, and external control interfaces.
- Wide-Band, High-Level Output
- Covers a wide frequency range from 100 kHz to 140 MHz and generates a high level of output at 126 dBμV (emf)
- High Stability
- The RF output signal is always phase-locked to the internal crystal oscillator to ensure high stability at ±5 parts per million
- Long Service Life
- A solid-state attenuator is used for varying the RF output signal level to extend the generator's service life
- Output-Signal Setting Adjustment
- The rotary knob can be used to change a specific digit of an RF frequency, output level, or depth setting
- Weather Band Output
- The generators can internally produce RF output from 162.0000 MHz to 163.0000 MHz (only FM monaural modulation)
- Internal Stereo Modulator
- Equipped with an FM stereo modulator, a single LG 3238 can generate stereo modulation signals for performing tests and measurements on FM multiplex receivers
- DDS for Internal Modulation
- As an internal modulation signal source, the generator has a DDS in addition to an RC oscillator. The DDS enables frequency settings ranging from 20 Hz to 20 kHz in 1 Hz steps. It can be used to test the frequency response of receivers
- Modulation Modes
- Modulation off, monaural, L=R, L, R, and L=-R
- Pilot Signal
- The pilot signal can be turned on and off independently, and the signal level ratio can be specified. (The pilot signal is always off when the modulation mode is monaural)
- Pre-Emphasis
- The time constant can be set to 25 μs, 50 μs, or 75 μs
- SCA Input
- The SCA input signal is approximately 0.56 Vp-p, which corresponds to a level ratio of 10%
- Preset Function
- Up to 100 sets of RF-frequency, output-level, modulation-mode, stereo-mode, and other settings can be stored as presets
Go To
| Frequency | |
|---|---|
| Range | 0.1 MHz to 140 MHz |
| Resolution | 100 Hz |
| Frequency Bands |
Band 1: 0.1000 MHz to 35.0000 MHz Band 2: 35.0001 MHz to 70.0000 MHz Band 3: 70.0001 MHz to 140.0000 MHz |
| Accuracy | ±5×10-6 |
| Internal Reference Oscillator Temp. Stability | ±5×10-6 |
| Output Level | |
|---|---|
| Range | -20 dBμV [emf] to 126 dBμV [emf] |
| Resolution | 0.1 dB |
| Accuracy |
±1.5 dB (output level ≥ 0 dBμV [emf]) ±2.0 dB (output level < 0 dBμV [emf]) |
| Impedance | 50 Ω |
| VSWR | ≤ 1.3 (output level ≤ 101 dBμV) |
| Attenuator Contact | Solid-state |
| Spectral Purity | |
|---|---|
| Spurious Output |
Harmonics (2nd, 3rd): ≤ -30 dBc Non-Harmonics: ≤ -50 dBc (bands 2 and 3) ≤ -40 dBc (band 1: 0.1 MHz ≤ fs ≤ 35 MHz) ≤ -30 dBc (band 1: fs ≥ 35.0001 MHz) (at 10 kHz or more away from the carrier fs: spurious output frequency) |
| Residual Modulation |
FM Component: ≥ 76 dB (10.7 MHz ± 1 MHz, 76 MHz to 108 MHz)
≥ 73 dB (bands 1 to 3: 0.3 MHz to 140 MHz)
(S/N at 1 kHz modulation frequency,
75 kHz deviation. 50 Hz to 15 kHz
demodulation bandwidth, 50 μs de-emphasis.) AM Component: ≥ 55 dB (band 1: 0.4 MHz to 1.7 MHz) ≥ 50 dB (bands 1 to 3: 0.15 MHz to 140 MHz) (S/N at 1 kHz modulation frequency, 30 % depth. (Beat components are excluded.) 50 Hz to 15 kHz demodulation bandwidth.) |
| Modulation | |
|---|---|
| RC Oscillator |
Frequency: 400 Hz, 1 kHz Accuracy: ≤ ±3 % |
| External Modulation Input |
Impedance: Approx. 10 kΩ Voltage: Approx. 1 V [peak] |
| Amplitude Modulation (AM) | |
|---|---|
| Optimal Range | Frequency ≥ 0.15 MHz |
| Depth | 0% to 80% |
| Displayed Depth | 0% to 100% |
| Resolution | 0.5% (0% to 100%) |
| Accuracy |
±(Setting × 0.1 + 1)% (Band 1: 0.4 MHz to 1.7 MHz) ±(Setting × 0.1 + 2)% (Bands 1 to 3: 0.15 MHz to 140 MHz) (Depth at 1 kHz modulation frequency. The maximum setting is 80%.) |
| Distortion |
Band 1: 0.4 MHz to 1.7 MHz ≤ 0.5% (0% to 30% AM) ≤ 1.5% (30% to 60% AM) ≤ 3% (60% to 80% AM) Bands 1 to 3: 0.15 MHz to 140 MHz ≤ 1.5% (0% to 30% AM) ≤ 3% (30% to 60% AM) ≤ 5% (60% to 80% AM) (1 kHz modulation frequency by the RC oscillator, 50 Hz to 15 kHz demodulation bandwidth, beat components are excluded) |
| Incidental FM |
≤ 150 Hz (band 1: 0.4 MHz to 1.7 MHz) ≤ 300 Hz (bands 1 to 3: 0.15 MHz to 140 MHz) (at 1 kHz modulation frequency, 30 % depth) |
| Ext. Modulation Freq. Response |
±1 dB (1 kHz reference) 20 Hz to 10 kHz (Maximum modulation frequency ≤ 2 % of carrier frequency for 30 % AM) |
| Frequency Modulation (FM) | |
|---|---|
| Optimal Range | Frequency ≥ 0.3 MHz |
| Frequency Deviation Range |
0.0 kHz to 100 kHz (Band 1's maximum FM deviation ≤ 25 % of the carrier frequency) |
| Resolution | 0.5 kHz |
| Accuracy |
±(Setting × 0.1 + 0.5) kHz (10.7 MHz ± 1 MHz, 76 MHz to 108 MHz) ±(Setting × 0.1 + 1) kHz (Bands 1 to 3: 0.3 MHz to 140 MHz) |
| Distortion |
≤ 0.05 % (10.7 MHz ± 1 MHz, 76 MHz to 108 MHz) ≤ 0.1 % (bands 1 to 3: 0.3 MHz to 140 MHz) (1 kHz modulation frequency, 75 kHz deviation, 50 Hz to 15 kHz demodulation bandwidth, 50 μs de-emphasis) |
| MPX Stereo Signal Separation |
≥ 55 dB (76 MHz to 108 MHz frequency, 1 kHz modulation frequency, 100% depth, 67.5 kHz deviation) |
| Incidental AM | ≤ 0.5% (10.7 MHz ± 1 MHz, 76 MHz to 108 MHz) (1 kHz modulation frequency, 75 kHz deviation) |
| Ext. Modulation Freq. Response |
MONO Mode: ≤ ±1 dB (20 Hz to 100 kHz, 1 kHz reference) Not MONO Mode: ≤ ±1 dB (20 Hz to 15 kHz, 1 kHz reference) |
| Pre-Emphasis | 25 μs, 50 μs, 75 μs, off (amplitude characteristics based on the off setting) |
| FM Stereo | |
|---|---|
| Optimal Range | Frequency ≥ 0.3 MHz |
| Main & Sub Channel Signals |
L=R Modulation Mode: INT, EXT signal; stereo modulation
based on one signal L Modulation Mode: INT, EXT signal; stereo modulation based on one signal R Modulation Mode: INT, EXT signal; stereo modulation based on one signal L = -R Modulation Mode: INT, EXT signal; stereo modulation based on one signal MONO Modulation Mode: INT, EXT signal; monaural modulation |
| Depth |
Range: 0% to 127% Resolution: 1% Accuracy: ±(Setting × 0.1 + 1)% (10.7 MHz ± 1 MHz, 76 MHz to 108 MHz) ±(Setting × 0.1 + 1.5)% (Bands 1 to 3: 0.3 MHz to 140 MHz) |
| Pilot Signal |
Frequency: 19 kHz
Accuracy: ±1 Hz Level Ratio Range: 0.0% to 15.0% Level Ratio Resolution: 0.1% Level Ratio Accuracy: ±(Setting × 0.1 + 1)% (10.7 MHz ± 1 MHz, 76 MHz to 108 MHz) |
| Stereo Separation |
≥ 55 dB (400 Hz to 1 kHz modulation frequency) (at 10.7 MHz ±1 MHz, 76 MHz to 108 MHz) |
| 38 kHz Subcarrier Leakage | ≤ -50 dB |
| Distortion | ≤ 0.05% (10.7 MHz ± 1 MHz, 76 MHz to 108 MHz) (1 kHz modulation frequency, 100 % depth, 50 Hz to 15 kHz demodulation bandwidth, 50 μs de-emphasis) |
| Pre-Emphasis | 25 μs, 50 μs, 75 μs, off (amplitude characteristics based on the off setting) |
| Simultaneous AM & FM | |
|---|---|
| FM Mono, AM | (1) FM mono (EXT) - AM (INT) |
| Simultaneous Modulation |
(2) FM mono (INT) - AM (EXT) (3) FM mono (EXT) - AM (EXT) (4) FM mono (INT) - AM (INT) |
| FM Stereo, AM | (1) FM stereo (EXT) - AM (INT) |
| Simultaneous Modulation |
(2) FM stereo (INT) - AM (EXT) (3) FM stereo (EXT) - AM (EXT) (4) FM stereo (INT) - AM (INT) |
| Preset Function | |
|---|---|
| Description | Stores and recalls these settings: frequency, output level, modulation mode (AM/FM, external/internal, depth, on/off), external control output. (Maximum number of presets: 100) |
| DDS Signal | |
|---|---|
| Oscillation System | 12-bit direct digital synthesizer |
| Frequency Range | 20 Hz to 20 kHz |
| Resolution | 1 Hz |
| Frequency Accuracy | ±0.1% |
| Flatness | Same as the external modulation characteristics |
| Weather Band Output | |
|---|---|
| Frequency Range | 162.0000 MHz to 163.0000 MHz |
| Resolution | 100 Hz |
| Frequency Accuracy | ±5×10-6 |
| Optimal Modulation Mode | FM monaural |
| External Interface | |
|---|---|
| SCA Input |
Input Level: 0.56 V [P-P] (0.2 V [rms]) (corresponds to
a level ratio of 10%) Frequency Range: 20 kHz to 99 kHz, ±1 dB (57 kHz reference) Input Impedance: Approx. 10 kΩ |
| Comp Output |
Modulation signal's monitor output connector Output Voltage: Approx. 5 V [P-P] (into 600 Ω, 100 kHz FM mono) Output Impedance: Approx. 600 Ω |
| Pilot Output |
Output for modulation modes other than
MONO Output Voltage: Approx. 1V [rms] Output Impedance: Approx. 1 kΩ |
| GP-IB |
Source handshaking: SH1 (Full capability) Acceptor handshaking: AH1 (Full capability) Talker: T7 (Basic talker, untalk on MLA, talk-only) Listener: L3 (Basic listener, unlisten on MTA, listen-only) Service request: SR0 (No capability) Remote/Local: RL1 (Full capability) Parallel polling: PP0 (No capability) Device clear: DC1 (Full capability) Device trigger: DT0 (No capability) Controller: C0 (No capability) |
| RS-232C |
Baud Rate: 38400 bps Character Length: 8 bits Parity: EVEN Flow Control: Xon, Xoff Stop Bits: 1 bit |
| External Control Interface |
Description: (1) Remote sequential recall (2) Remote modify (3) Remote direct recall (4) Control output (5) Relay drive output Output voltage: Approx. 5V Output current: Approx. 50mA |
| Power Requirements | |
|---|---|
| Voltage Range | 90 to 250110V AC |
| Frequency | 50/60 Hz |
| Power Consumption | ≤ 60VA |
| Temperature and Humidity Range | |
|---|---|
| Operating Temperature | 0° C to 40° C, 20% to 90% (relative humidity) |
| Overvoltage Category | |
|---|---|
| Overvoltage Category | CAT II |
| Dimensions & Weight | |
|---|---|
| Dimensions (HxWxD) |
3.9 x 16.8 x 11.8" (99 x 426 x 300mm) (Without knobs or buttons) |
| Weight (Approx.) | 19.8 lb (9.0 kg) |
Cables & Cable Management
- Price: $9.59
Power Accessories
- Price: $83.95
What's in the Box
- Power Cord
- Instruction Manual (CD)
- 2 Year Limited Warranty w/ Registration
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