Verschillen
Dit geeft de verschillen weer tussen de geselecteerde revisie en de huidige revisie van de pagina.
| Volgende revisie | Vorige revisie | ||
| reference_tape [2018/04/05 15:16] – aangemaakt will | reference_tape [2024/01/24 10:51] (huidige) – will | ||
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| Regel 1: | Regel 1: | ||
| + | ====== Reference tape ====== | ||
| - | For sale is one new reel to reel calibration | + | For sale is one new reel to reel calibration |
| - | The calibration tape is intended to be used for adjustind AKAI 4000 DX reel to reel recorders | + | The calibration tape is intended to be used for adjustind AKAI 4000 DX reel to reel recorders. |
| - | The tape is recorded on a full refurbished and correct adjusted Revox B77 Mk2 half track machine | + | * The tape is recorded on a full refurbished and correct adjusted Revox B77 Mk2 half track machine. |
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| - | My Revox recorder has a actual wow & flutter level less than < ± 0.025 % ( JIS ) | + | |
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| - | Measured with a LEADER LFM-39A wow and flutter meter. | + | |
| Frequencies and reference levels are generated by a custom made automated frequency sequencer with fully digital controlled DDS generator for ultra-low distortion. | Frequencies and reference levels are generated by a custom made automated frequency sequencer with fully digital controlled DDS generator for ultra-low distortion. | ||
| - | The actual recording levels are measured by the integrated digital AC thru RMS dBm meter section on the sequencer / calibration box for highest recording accuracy. | + | * The actual recording levels are measured by the integrated digital AC thru RMS dBm meter section on the sequencer / calibration box for highest recording accuracy. |
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| - | Frequency accuracy of the test box is better that 0.01% and the reference levels are better than +/-0.5 dB | + | |
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| - | The test tape is recorded as half track at 19 cm/s (7½ ips) containing the following tracks: | + | |
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| - | #1 16 KHZ -20 dB at 7 1/2 IPS for azimuth | + | |
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| - | #2 250 Hz at +4dB at 7 1/2 IPS for playback level adjustment | + | |
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| - | #3 3kHz at 0 dB at 7 1/2 IPS for speed and wow & flutter test according to the JIS norm | + | |
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| - | #4 | + | |
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| - | #5 1 kHz 0 dB at 7 1/2 IPS | + | |
| Duration of each track is 120 sec | Duration of each track is 120 sec | ||
| - | + | * The test tape comes with green / red leader tape for easy direction identification on a 15 cm reel | |
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| - | The test tape comes with green / red leader tape for easy direction identification on a 15 cm reel | + | |
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| - | The tape is recorded on new BASF LPR35 ( Pyral ) tape. | + | |
| - | Note that the tape is recorded “Tale end out” and need to be rewind to an empty reel before use. | + | Note that the tape is recorded “Tale end out” and need to be rewind to an empty reel before use. |
| This operation ensures that the test tape is aligned on the reel according to the tape recorder under tests actual tape feed mechanisms alignment for maximum precision during the test. | This operation ensures that the test tape is aligned on the reel according to the tape recorder under tests actual tape feed mechanisms alignment for maximum precision during the test. | ||
| - | I always recommend storing the Reference tape “Tale end out” for protection and minimal “print trough” | + | I always recommend storing the Reference tape “Tale end out” for protection and minimal “print trough” |
| If other recording speeds are required please contact me | If other recording speeds are required please contact me | ||