Acoustical Manufacturing Co. QUAD MULTIPLEX DECODER Livro de instruções - Página 7

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OPERATION

Mono

Press RADIO and MON or 2-MON push

buttons. All transmissions \\-ill be heard from

the tuner in the normal way. Stereo broadcasts

will be heard in their mono form, i.e. left and

righthand channels added tog(;ther.

Stereo

Press RADIO and STEREO push buttons.

After the Blue channel power amplifier has

warmed up mono transmissions and interstation

noise will be muted and or.ly stereo trans

missions will be heard. If no signals are audible

when tuning through the VHF band then there

are no stereo broadcasts being transmitted

within range at that time.

Long Distance Reception

Fading and background n0ise are more

apparent when receiving stereo transmissions

from distant stations. The stereu information is

degraded more than the mono channel so that

fading and background noise, if obtrusive, may

be reduced by reverting to Mono reception.

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SPECIFIC A TION

De-emphasis:

500S (European standards)

750S (North American standards)

Output voltage:

lOOm V (Nominal for 30% modulation)

into lOOK ohms

Crosstalk:

Better than 30 dB at 1 kc/s

Suppression:

19 kc/s Pilot tone better than 36 dB

38 kc/s Switching tone better than 40 dB

Power requirement:

330V DC,

8mA mono (from Yellow

channel HT) plus 9mA stereo (from Blue

channel HT)