TRIO KT-1300
¥ 29,800 (around 1973)
Commentary
FM/AM tuner with double switching and de-modulator system.
TRIO's unique double-switching and de-modulator system is used in the MPX section.
In this method, the outputs of the main switching circuit and the auxiliary switching circuit are symmetrical and in opposite phases, and the leakage signal is canceled by adding the outputs of both switching circuits.
In addition, a phase correction circuit is installed in front of the auxiliary switching circuit to match the phases of the main signal and the leakage signal, so that it is possible to prevent the SCA filter from affecting the high-frequency range and from deteriorating the separation caused by the phase difference between the main signal and the auxiliary signal at the IF stage.
A junction FET is used in the front end part to achieve high sensitivity and low noise.
High-frequency single-stage amplification by a frequency number line 3-row varicon is adopted to improve selectivity characteristics.
A 4-element ceramic filter is used to take measures against adjacent stations.
It is equipped with an FM muting mechanism to cut noise between stations.
It is equipped with an LC-type carrier leak filter to suppress carrier leak and obtain more accurate de-emphasis.
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Antenna impedance | 300 Ω equilibrium 75 Ω unbalance |
| Sensitivity (IHF) | 2.2 μ V |
| quieting Slope | 48 dB (5 μ V) 60 dB (10 μ V) 63 dB (50 μ V) |
| Distortion factor | 0.5% |
| SN ratio (100% modulation, 100 μ V input) | 65dB |
| Capture ratio | 3.0dB |
| Selectivity (IHF) | 50dB |
| Image ratio | 55dB |
| IF interference ratio | 90dB |
| AM suppression ratio | 60dB |
| Spurious interference ratio | 90dB |
| <FM-MPX Part> | |
| Separation | 40dB(400Hz) 35 dB (100 Hz to 8 kHz) |
| Carrier leak | 45dB |
| Distortion factor | 0.8% |
| Signal-to-noise ratio | 6.0dB |
| Frequency characteristic | 100 Hz ~ 10 kHz + 0.2 -0.3 dB 30 Hz to 15 kHz + 0.2 -2dB |
| SCA interference ratio | 45dB |
| <AM Tuner Section> | |
| Receiving frequency | 520 kHz to 1610 kHz |
| Sensitivity | 300 μ V/m (bar antenna) 25 μ V (IHF) |
| Image ratio | 45dB |
| IF interference ratio | 35dB |
| Signal-to-noise ratio (30% modulation, 1 mv input) | 45dB |
| Selectivity | 30dB |
| Distortion factor | 1% |
| <General> | |
| Rated output | FM (400 Hz, 100% modulation) : 1.0 V AM (400 Hz, 30% modulation) : 0.15 V |
| Output impedance | 120 Ω |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption (Electrical Appliance and Material Control Law) | 10W |
| External dimensions | Width 365x Height 117x Depth 263 mm |
| Weight | 4.5kg |