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Audio Accessories & Misc.


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Item #:MO787203
Condition:Reference Item
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Model Description:
The Belar TVM-230 is a digital BTSC TV Stereo Monitor/Analyzer.

Model Details

Operated in conjunction with the Belar TVM-100, TVM-101, or other wideband aural demodulator, the Belar TVM-230 provides the measurement capability necessary for the set-up, test, and measurement of BTSC Stereo TV transmission systems, as well as providing accurately decoded Left and Right channel audio outputs.

Inputs Two wide-band demodulated aural
   composite, selectable from front panel

Input Level 1.0V to 2.0 Vrms for
73 kHz peak deviation

Input Impedance 100 kW, unbalanced
   BNC connector


   Left and Right

       Audio Active 50 W Balanced Output
   Level: +10 dBm into 600W,
XLR connector

       Test 2.5 Vrms, 75 W, unbalanced,
   BNC connectors

       Scope (auto-ranged) 1.3 Vrms, 75 W,
   unbalanced, BNC connectors

   Pilot Output 2V P-P, 500 W, unbalanced
   BNC connector

   dbx Level 3.536 Vrms for 50 kHz L-R
   deviation, BNC connector


   Serial Interface RS-232, DB-9 connector

   Unit Interface Wizard Standard Interface

Remote Meter Outputs:

   For interface to optional Model MP-230 Analog Remote Meter

Analog Meter Outputs for Left, Right,
   L+R and L-R channels

        Open Collector outputs for Stereo Peaks Per
      Minute (PPM), L+R PPM, Pilot

   Relay closures for Stereo PPM, L+R PPM, Pilot

Separation + Noise

   Equivalent Mode 70 dB, 50 Hz to 14 kHz

   BTSC Exceeds EIA MTS recommended
   practices for monitoring equipment. Typical
separation at 100%, 75 µsecond equivalent
input modulation:

   50 Hz to 8 kHz greater than 40 dB

   8 kHz to 12 kHz greater than 35 dB

12 kHz to 14 kHz greater than 30 db

Crosstalk + Noise

   L+R to L-R75 dB
       (50 Hz to 14 kHz)

   L-R to L+R75 dB
       (50 Hz to 14 kHz)

   SAP to L+R75 dB

   SAP to L-R75 dB

   PRO to L+R75 dB

   PRO to L-R75 dB

Frequency Response (Left and Right channels)
   Equivalent Mode± 0.05 db
   (50 Hz to 14 kHz)

   Typical at 100% 75 µsecond equivalent input
   modulationwithin ±0.1 dB
  (50 Hz to 14 kHz)

   Typical between 10% and 100% 75 µsecond equivalent
   input modulation:
  50 Hz to 8 kHzwithin +0.05 to -0.02 dB
  8 kHz to 14 kHzwithin +0.05 to -0.35 dB

Signal-to-Noise Ratio
   (L, R equivalent mode, pilot on)
   No de-emphasis75 dB
   De-emphasized, 75 µsecond 85 dB

Distortion + Noise

   Harmonic Distortion:
  (50 Hz to 14 kHz, measured across 30 kHz bandwidth)
  Equivalent Mode0.025%

Signal Input-to-Output Delay 5 milliseconds

Dimensions1 EIA Rack Unit
1.75"H x 17"D x 19"W

Power Requirements     30 watts, 100-240 VAC
  50 to 60 Hz

Shipping Weight        13 lbs

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