KENWOOD L-03TPRO
¥ 1,500,000 (Preliminary price, released in 1984?)
Commentary
A stereo FM monitoring receiver developed based on L-03T to monitor stereo FM broadcasting radio waves at FM stations.
The L-03TPRO was used as an air monitor at FM Tokyo and many other broadcasting stations.
It seems that it was not sold to the general public.
The L-03TPRO was developed because of the need for a sound quality monitor at the time when the number of live programs increased, PCM PCM equipment was introduced, and PCM lines were enriched.
Equipped with a Signal Meter, it can measure linearly from 20 db weak electric field to 80 db strong electric field.
Equipped with a Modulation Meter, it can monitor the FM modulation level of the broadcasting station.
Measurement is possible up to 150% in excess of 100%.
Equipped with a Pilot Signal Level Meter, it can monitor whether the modulation level of the 19 kHz pilot signal is at a constant level of 9% to 10%.
Can measure from 4% to 20%.
Equipped with an unmodulated alarm circuit.
The operation of this circuit is such that the input signal is modulated at a frequency of 100 to 10 kHz and modulated for 1 minute while maintaining the degree of modulation at 5%. Assuming that this is not modulated, the operation time of the alarm circuit is 30 seconds ± 2 seconds.
The MAX and MIN of the alarm circuit operation time can be set to MAX44 seconds and MIN22 seconds by adjusting the volume.
A pilot signal with a modulation level of 4% switches between stereo and monaural modes.
Model Rating
| Type | FM stereo tuner |
| Received radio wave | Stereo FM broadcasting radio |
| Receiving frequency | 76 MHz to 90 MHz Can be fixed to any one frequency. |
| Receiving system | Superheterodyne system |
| Input Level / Impedance | 70 dB μ ~ 80 dB μ / 75 Ω unbalanced, BNC connector |
| Output Level / Impedance | + 10dBmMax/600 Ω balanced, 3P cannon connector (at 1 khz, mono modulation, modulation degree 75 khz) |
| Intermediate frequency | 10.7MHz |
| Local oscillation frequency | Oscillation frequency = Receiving frequency - Intermediate frequency, 65.3 mhz to 79.3 mhz |
| De-emphasis time constant | 50 μ s |
| Selectivity (IHF) | Wide : 40 dB (± 400 kHz) Narrow : 55 dB (± 300 kHz) |
| Image interference ratio | 90dB |
| Behavior during muting | Direct : 45 dBf to 57 dBf Distance : 25 dBf to 37 dBv |
| Input impedance | 75 Ω, VSWR1.2 or less |
| Output impedance | 600 Ω ± 10% at 1 kHz 600 ohm ± 10% at 50 Hz to 15 kHz * For each terminal |
| Output level tolerance | Rated output level ± 1 dB or less |
| Frequency characteristic | The tolerance from the 50 μ s de-emphasis ideal characteristic is within ± 0.5 dB based on 1 kHz. |
| S/N ratio (ANT input 80 dB μ, IHF T-200 used) | mono:96dB stereo:86dB |
| Distortion factor (100% modulation, wide) | mono:0.005%(1kHz) stereo:0.015%(1kHz) |
| Separation (wide) | 60 dB or More (1 kHz) 47 dB (50 Hz to 10 kHz) |
| Lateral level difference | 1.0 dB or less |
| Use | Continuity |
| Ambient temperature | 0 ° C ~ 40 ° C |
| Pwer | Single-phase current 100 V, 50Hz/60Hz |
| External dimensions | - |
| Weight | - |