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General Information

   Technical Specs & Block Diagram

HL203 with VQR (Voice Quality Restoration)

Tutorial about VQR technology

PDF Brochure HL202 & 203


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HL 202

 

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Technical Specifications HL 202
LINES:
2, 4 & 6 phone or cellular lines.
Full conference with 8 dB cross gain.

TECNOLOGY:
Active Hybrid with send and return gain, auto-adjusted by audio limiter and AGC. Balanced telephone lines floating with ground isolation by Nickel-Ferrite transformers.

AGC Output level:
Constant level to console, independent from line level due to the action of the internal AGC. A 15 dB phone level change causes less than 3 dB change at the Output
Output level control on the front panel. Nominal level +4 dBu, variable between -60 / +8 dBu

RETURN LEVEL:
Audio limiter & AGC to operate with signals from  -5 to + 8 dBu
Return Level at phone line 2 V pp equivalent to 0 dBm
AUDIO RETURN FILTERS:
Band-Pass filters in return channel, limits response to 400 – 2.200 Hz to eliminate on-air sound coloration.
PRIORITY SYSTEM:
The speaker have priority to interrupt, causing an attenuation of 12 dB on the caller.



Return Level at phone line:
0 dBm (2 Vpp)


HYBRID OUTPUT RESPONSE:
250 - 3.400 hz +/- 1 dB
IMPEDANCE: 600 Ohms


HYBRID GAIN:
Self-adjusted between 12 and 30 dB, according to the line level.


DISTORTION, THD:
Below 0,2 % at the balanced output @ 1 Khz , + 4 dBm level
 
NOISE LEVEL:
S/N better than 70 dBA, measured with artificial phone line of 2 km
HYBRID REJECT:
More than 40 dB
at 1 Khz. Measured with 2 km artificial phone line

REJECT ADJUSTMENT:
15 turns, Multi-turns  preset on each line. Adjust it only at installation

LINES ISOLATION
Independents inputs, balanced and floating with transformer Isolation 250 V/CA
OVERLOAD SAFETY
2 KVolt protection against lightning discharge using SIOV technology
Tested using the Siemens/Ramatel 44.04 recommendation

POWER:
200-240 V/100- 130 V
50/60 Hz, 5 VA

DIMENSIONS:

Rack mounting 19"
1 U (44mm)

 

Block Diagram
2 x HL202 units

(Engineers Information)

Click here to enlarge block diagram

The Hybrid HL 202 owes its excellent audio quality to its advanced design.
We give this Block Diagram, in order to fully understand the Solidyne technology

You will find that our Phone Hybrids incorporates technologies almost never seen
before in units of other brands. For example:

1) An audio processing stage in the return channel to maintain constant the level during conferences.

2) Audio processing in the returning channel. This process makes unnecessary the operator continuous correction of the send level. On the other hand, it increases the intelligibility of the voice, allowing listening in noisy environment. Band limiter filters eliminates the return of out of band components, to maintain the quality of the local voice when the hybrid is on-air.

3) HL 202 has 2, 4 or up tp 6 internal mix-minus buses. This way it is possible to obtain perfect conferences because it has cross gain of 8 dB, so that all the remote callers can be listened to each other.

4) Inputs use Nickel-Ferrite transformers that brings high inductance and excellent isolation to avoid humming or line noises

5) Terrestrial lines or cellular phone It allows managing simultaneous telephone communications by phone lines (2 wires mode) or cellular phone (4 wires mode) . The commutation is automatic, when RJ11 connector is plugged the cellular is detected.

6) Lightning protection. Using metal oxide varistor (SIOV) the HL 202 hybrid is protected against high voltage. A 2 KV test capacitor discharge is done at each unit to be approved at factory.