ATR Master Tape Specifications
Magnetic Characteristics: | Test Notes: | ||
Coercivity Hc: | 365 Oe, BH | Nominal | |
Retentivity Brs | 1590 Gs | ||
Particle orientation: | Longitudinal | ||
Recording Performance References: | |||
Recorder | 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 µs, 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 0.15 mils | |
Maximum Output Level 1 kHz at 3% 3rd harmonic distortion | 16.5 dB | ||
Saturation Output Level | |||
1 kHz | 23.5 dB | Level at which linearity exceeds 1 dB of input signal | |
10 kHz | 16.1 dB | ||
16 kHz | 15.2 dB | ||
Maximum linear operating level | 9 dB over 185 nWb/m | Linear frequency vs output level through pass band. | |
3rd Harmonic Distortion: | 1 kHz fundamental frequency | ||
0 dB Reference operating level | 0.032 % | ||
+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 (Bias Noise) | -68 dB | ASA , NAB A weighted | |
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 | 1K tone on preceeding wrap of tape stored for 24 hours on NAB reel at 72º F | |
Physical Specifications: | |||
Yield Strength | 12 Lbs / half in | Produces 3% elongation of a 6" test sample | |
Breaking strength | 24 Lbs / half in | Force that will break a 6" test sample | |
Coating thickness | 0.59 mils | ||
Backcoating | 0.03 mils | ||
Polyester base film | 1.42 mils | ||
Total | 2.04 mils | ||
Standard widths: | |||
1/4" | 0.246 inches | Tolerance +0.0 / -0.002" | |
1/2" | 0.496 inches | ||
1" | 0.996 inches | ||
2" | 1.996 inches | ||
Backcoating resistance | ? 30K Ohms | Per linear inch by pin probe | |
Oxide coating resistance | >5M Ohms | ||
Bias Current Recommendation1 | 10 kHz signal, 15 ips | 10 kHz signal, 30 ips | |
1 mil gap length (ATR-Aria) | 1.2 dB | 0.5 dB | |
5 mil gap length (Ampex) | 3.0 dB | 1.4 dB | |
.25 mil gap length (Studer) | 3.5 dB | 1.5 dB |