ATR Master Tape Specifications
Magnetic Characteristics: Test Notes:
Coercivity Hc: 365 Oe, BH Nominal
Retentivity Brs 1590 Gs
Particle orientation: Longitudinal
Recording Performance Test Reference:
Recorder model Ampex-Aria ATR-102
Record head gap length 1 mil
Reproduce head gap length 0.12 mil
Track width 200 mils nominal
Tape Speed 30 ips, 76.2 cm/sec
Playback equalization 17.5 us, AES
Recording bias 1.4 dB over @ 20 kHz See Recommended Bias
chart below 1
Bias osc. frequency 438 kHz
Recording Level Reference 185 nWb/m = 0 VU Ampex operating level
Frequency Pass Band 20Hz-20Khz Equivalent wave length of
1.5 inches to 0.0015 mils
Recording Performance:
Maximum Output Level
1 kHz at 3% 3rd harmonic
distortion 18 dB
Saturation Output Level
1 kHz 23.5 dB Level at which linearity
10 kHz 16.1 dB exceeds 1 dB of input
16 kHz 15.2 dB signal
Maximum linear operating level 10 dB Linear frequency vs output
-0.5 dB level through pass band.
3rd Harmonic Distortion 1 kHz fundamental
0 dB - Reference operating level 0.032 % frequency
+6 dB over operating level 0.096 %
+10 dB over operating level 0.28 %
+12 dB over operating level 0.49 %
Signal to Noise ratio -68 dB ASA , NAB A weighted
(Bias noise)
Peak Dynamic Range 86 dB
Dynamic range ref to 1% 82 dB 1 kHz fundamental
3rd harmonic distortion
Linear dynamic range 78 dB Range in which frequency /
wavelength response is linear
±0.3 dB tolerance
Print-through characteristic -60 dB 1KHz tone on preceding wrap
of tape stored for 24 hours
on NAB reel at 72º F
Physical Specifications:
Yield Strength 12 Lbs on ½” Produces 3% elongation of a
6” test sample
Breaking strength 24 Lbs on ½” Force that will break a 6” test
sample
Coating thickness 0.73 mils
Backcoating 0.040 mils
Polyester base film 1.42 mils
Total 2.28 mils
Standard widths:
¼” 0.246 inches Tolerance +0.0 / -0.002”
½” 0.496 inches
1” 0.996 inches
2” 1.996 inches
Backcoating resistance ≤ 30K Ohms Per linear inch by pin probe
Oxide coating resistance >10M Ohms
Bias Current Recommendation1 10 kHz signal, 15 ips 10 kHz signal, 30 ips
1 mil gap length (ATR-Aria) 1.4 dB 0.6 dB
.5 mil gap length (Ampex) 3.0 dB 1.4 dB
.25 mil gap length (Studer) 4.5 dB 2.0 dB
1Note: ATR Master Tape has a wide acceptable bias current vs. distortion tolerance.
The above recommendations are to be used as a guide only.