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KT-770 ( TRIO-Kenwood )

[Outline] [Comparison characteristics before and after adjustments]


Fig1. KT-770 under adjustment with VP-7637A , LS-223 and MSG-2570.

[Comparison characteristics before and after adjustments (*1)]

Characteristics Before adjustment After adjustment
19kHz pilot leakage L = -47dB , R = -58dB L < -70dB , R < -70dB
38kHz sub carrier leakage L = -79dB , R = -85dB L < -80dB , R < -80dB
Separation at 1kHz R to L = 45dB , L to R = 42dB R to L > 60dB , L to R > 60dB
2nd harmonics L = -65dB , R = -63dB L < -65dB , R < -65dB
3rd harmonics L = -76dB , R = -76dB L < -70dB , R < -70dB

[FFT characteristics after adjustment (*2)]

Fig.2 Input = L , output=L


Fig.3 Input = L , output = R


Fig.4 Input = R , output = R


Fig.5 Input = R , output = L

(*1)Adjustment procedure is referred to the article about KT-770 on  "Hiro's web page". Always thanks!
(*2)Using a free software "WaveSpectra"  made by "efu" ( fs = 96kHz , data length = 65536 ).