Akai 1730-SS

CROSS TALK
1. Between the tracks (2 Channel)
(TAPE)
ZENG
BKC
Tape direction
As shown in the figure, first record a 1,000 Hz sine wave
on track No.3 at +3 VU level. Next, remove the
1,000 Hz input signal and record under a non-input
condition. Then, playback the tape on tracks 3 and 1
(reversed condition of tape) through the 1,000 Hz B.P.F.
(Band Pass Filter, Sensitivity ... 1: 1) and obtain the
ratio between the two by using the following formula.
C = 20 log? (AB)
2°c= 1
C= Desired cross talk ratio (dB)
Eo = 1,000 Hz signal output level BES
E2 = 1,000 Hz cross talk output level
E, = Non-input signal record level CERRY
2. Between the channels (4 Channel)
Tape direction ©)
As shown in the figure, first record a 1,000 Hz sine wave
on track No.1 at +3 VU level. Next, remove the
1,000 Hz input signal and record under a non-input
condition.
Then, playback the tape on track No.1 and No. 2
through the 1,000 Hz B.P.F. (Band Pass Filter, Sensiti-
vity ... 1:1) and obtain a ratio between the two from
the following formula.
E
C = 20 log = (dB)
2 I
C= Desired cross-talk ratio (dB)
Eo = 1,000 Hz signal output level fest |
E, = 1,000 Hz cross-talk output level CLA
E, = No-input signal record level RES
Tape direction
FREQUENCY RESPONSE
Audio 1730-SS
Oscillator Input Output
Connect the measuring instruments as shown in the
above diagram, and measure the frequency response in
the following sequence :
RECORD :
1) Introduce a sine wave of 1,000 Hz to the Line Input
of the recorder being tested through an attenuator
from an audio frequency generator.
2) Set the Record/Playback Lever to ‘‘Rec” position
and adjust the line input volume so that the VU
meter needle indicates “0” VU.
3) Under the conditions described in (2), lower the
input level 20 dB with the attenuator.
4) Record the spot frequency from the audio fre-
quency generator in the range of 30 to 23,000 Hz.
PLAYBACK :
5) Set the Record/Playback Lever to “Play” position.
6) Connect a V.T.V.M. to the Line Output.
7) Playback the previously recorded tape.
8) Adjust the output level to “0” dBm at 1,000 Hz
(indicated on range selector of V.T.V.M.).
9) Playback the recorded spot frequencies under the
conditions in (8); make a memo of Output Level
and plot the value ona graph.
(Note : New tape of particularly good quality should be
used for measurement of the frequency response. Fuji F
tape is recommended).
In case of trouble, etc. necessitating disassembly, pleas
disassemble in the order shown in photographs. Reas-
semble in reverse order.