The JUSTIN 808 maintains time alignment between analog FM and HD1 channels to within 23 microseconds (±1 sample).
The JUSTIN 808 only makes its time-alignment adjustments to the HD1 channel leaving the critical FM transmission untouched - an important distinction when choosing a time-alignment processor.
No more lost words, stuttering, echoes, or level shifts. The entire sync process is 100% automatic, and the JUSTIN’s Web interface features SNMP support and dispatches e-mail and SMS alarm messages.
Approved by DTS/iBiquity for HD Radio™.
- Mike Friedman: Commonwealth Public Broadcasting, Richmond, VA
- Radio Guide Vol. 23 No 4 HD/FM Time Alignment and Blending
- Clay Freinwald The JUSTIN 808 - Keeps HD in Sync (pdf)
Placed in line with the AES audio feed to the HD Radio™ exciter, the JUSTIN 808 will automatically correct diversity delay errors and r.m.s. level errors between the FM and HD1 programs.
Placed in line with the AES audio feed to the analog FM stereo encoder, the JUSTIN 808 is capable of providing the entire diversity delay, if required. It will automatically correct diversity delay errors, but cannot normalize r.m.s. level errors between the two programs.
Corrects to ±1 sample (±23 μs)
Small delay errors (up to 0.4 seconds) require up to 30 seconds to correlate; delay errors of 10 seconds could require as much as 3.5 minutes.
A front-panel menu item, also accessible via the Web Interface, permits a manual time alignment quick reset to a previous long-term mean value. This obviates correlation acquisition and brings time alignment close to the required figure.
The JUSTIN 808 offers automatic program phase correction when a phase reversal is sensed between the analog FM and digital HD1 program channels. R.M.S. level correction is also available when the JUSTIN 808 is placed in the AES digital audio feed to the HD Radio™ exciter.
1.RSSI(Low RF signal) 2.Audio Loss or Levels Out of Range
3.Out of Alignment Range(user preset)
1.Front-panel OLED display
2.Rear-panel ground-closure ‘tallies’ with selectable logic polarity
3.SMS-text/email notifications via SMTP
4.JUSTIN 808 Webpage indication
All alarms are logged by the JUSTIN 808; statistics are presented graphically via the Web Interface and may be downloaded for follow-up study.
The JUSTIN 808 Web Interface is compatible with desktop/laptop computers, tablets and smart phones, and supports SNMP with a downloadable MIB file. All functions available at the front panel are duplicated by the Web Interface.
105 - 130VAC or 210 - 260VAC, 50/60Hz; 20 watts
1¾”H x 19”W x 9”D (1U); 10 lbs. (shipping weight)
Continuous operation at ambient temperatures between 32ºF/0ºC and 122ºF/50ºC; 0-95% relative humidity, non-condensing, altitudes to 10,000ft/3,048m.