Overlap Blocking Filters

Overlap Blocking Filters

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DTT Overlap Blocking Filters

 

A new range of UHF bandpass filters from Proception, intended for blocking unwanted reception of transmissions from an adjacent region.

 

The introduction of high-power digital transmissions has led to problems with some receivers selecting multiplexes from out-of-area transmitters, leaving confused viewers watching the wrong regional services, or even listening to the wrong language!

Although this problem should be solved in the longer term by receiver developments, the use of bandpass filters can provide a quick, simple and cost effective solution, saving installers frequent call-backs.

 

Features

 

  • Optimised passbands cover most UK require­ments in just four versions.
  • Good out-of band rejection helps block TETRA and GSM, also LTE (4G), depending on model.
  • ‘F’ type connectors for good screening factor, helping prevent leakage around the filter.
  • Good 75 Ω match throughout the passband.
  • DC blocked – no damage if inadvertently line-powered (24 V DC max).
  • Optional weatherproof outdoor housing available (order product code proMHD/CASE/S).
  • Equipotential bonding terminal.

 

TECHNICAL INFORMATION

 

Product Code
Channels
Freq. Lower Upper1

Insertion

loss2

Stopband

Rejection3

Conn.

PROOBF1A

21 - 30

  470 - 550MHz 

  DC - 438MHz 

  578 - 1600MHz 

< 3 dB

> 30 dB

F

PROOBF1B

39 - 52

  614 - 726MHz 

  DC - 578MHz 

  762 - 1600MHz 

< 3 dB

> 30 dB

F

PROOBF1C

48 - 62

  686 - 806MHz 

  DC - 650MHz 

  920 - 1600MHz 

< 3 dB

> 27 dB

F

PROOBF1E

39 - 62

  614 - 806MHz 

  DC - 562MHz 

  920 - 1600MHz 

< 3 dB

> 27 dB

F

PROMHD/CASE/S

Case for external installations

 

1. Specified stopband rejection is typically maintained to above 2 GHz (but is not guaranteed above 1.6 GHz).
2. Insertion loss may increase slightly at the passband edges, but will not exceed 4 dB.
3. Typical stopband rejection is around 35–40 dB except close to the band edges.

 DSO Overlap Table

Other applications

 

The entire range offers excellent cut-off below 470 MHz and will help with problems from TETRA, telemetry and 70 cm amateur band transmissions. Above channel 62 all versions will help solve GSM mobile phone interference problems, while the ‘A’ and ‘B’ models will additionally help suppress the forthcoming LTE (4G) signals.

PROOBF1B

Specific References

ean13
5060041662341

Download

PROOBF Data Sheet

Detailed Specifications

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