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Amplifiers

Sub-trunk amplifiers TERRA DA140 and DA140D

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Manufacturer:
Type of amplifier:
terra_da140.jpg terra_da140d.jpg

 

Backward channel amplifier is built in TERRA DA 140 and DA140D sub-base amplifiers.  Built in diplexers and equalizer (line equalizer) provide flexibility of choice of backward channel frequency range (Upper backward channel frequency range is 200 MHz).

Discrete regulators in direct and backward channel allow setting accurately the necessary effective gain level and amplitude-frequency characteristic tilt. Amplifier adjustment can be done without interruption of subscribers’ service.

Sub-base amplifiers DA140 and DA140D can switch effective gain 40/31 dB in the direct channel and expand upper frequency range from 862 MHz up to 1002 MHz. Test points: at the input – two-directional, at the output - directional.

Advantages: 

  • GaAs two-cycle output stage.
  • changeable backward channel band owing to built in diplexer modules.
  • all adjustments are done without interruption of subscribers’ service.
  • shifted direct channel frequency range 862 MHz or 1 GHz.
  • switched direct channel gain 31 dB or 40 dB.
  • backward channel frequency range up to 200 MHz (depending on built in modules).
  • damp-proof  shielded molded case.
  • static power supply unit.
  • possibility of distant feed insertion into the line from the external power supply (DA140D).
  • protection against voltage surge at inputs and outputs.

Designation

DA140D 

DA140

Forward channel

Frequency range*

MHz

47/75/87/108-862/1002

Effective gain

dB

40/31

Amplitude-frequency characteristic unevenness

dB

± 0,75

Reflectance factor at the input and output

dB

18 dB/40 MHz-1.5 dB/octave

Input attenuator

dB

0-15 dB with an  interval 1 dB

Input line equalizer

dB

0-15 dB with an  interval 1 dB

Cable simulator

dB

0/3/6/9

Interstage attenuator

dB

0/2/4/6

Interstage line equalizer

dB

0/3/6/9

Attenuation coefficient at the test terminal at the input (two-directional)

dB

-20 ± 2,0

Attenuation coefficient at the test terminal at the output (directional)

dB

-20 ± 0,75

Noise figure

dB

max. 8

Output level CTB (EN50083-3)***

dBmkV

109 dBμV (42 chan.)

Output level CSO (EN50083-3)***

dBmkV

109 dBμV (42 chan.)

Backward channel

Frequency range*

MHz

5-30/55/65/85

Effective gain

dB

30

Amplitude-frequency characteristic unevenness

dB

± 0.75 dB (5-65 MHz); ± 1.0 dB (5-200 MHz)

Reflectance factor at the input and output

dB

18 dB/40 MHz-1.5 dB/octave

Input attenuator

dB

0/5/10/15

Output attenuator

dB

0-15 dB with an interval 1 dB

Output line equalizer

dB

0-15 dB with an interval 1 dB

Ingress noise filter

dB

> 20 dB to 13.5 MHz; < 1.5 dB from 18 MHz

Attenuation coefficient at the test terminal at the output (two-directional)

dB

-20 ±1.0

Attenuation coefficient at the test terminal at the input (directional)

dB

-20 ± 0.5

Noise figure

dB

max. 8

Output level CTB (EN50083-3)

dBmkV

113 dBmkV (5-65 MHz); 111 dBmkV (5-200 MHz)

Output level CSO (EN50083-3)

dBmkV

105 dBmkV (5-65 MHz); 104 dBmkV (5-200 MHz)

General

Source voltage

В

165-250 В, 50 Hz

30-60 В, 50 Hz

Wattage

W

max. 10

max. 11

Current consumption

24  V  AC

А

0.6

-

42  V  AC

А

0.4

-

65  V  AC

А

0.3

-

Maximum let-through current

А

4 A

Input and output connection type

PG11

Test terminal connection type

F

Signal ratio to background interference (4 A)

min. 65 dB

Operating temperature range

W

-20°...+50°C

Dimensions / Weight (packed)

mm

180 x 125 x 76 mm (case);

213 x 125 x 76 mm (adjustment dimensions) / 1,4 kg

      * - - frequency range depends on built in diplexer and amplifier adjustments;
    ** - gain depends on amplifier adjustments;
  *** - output level (CTB, CSO) is measured with an interstage line equalizer 6 dB;
**** - Backward channel frequency range depends on built in diplexer; the upper vale is 200 MHz.

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