BPF 3/4
Band-Pass Filter for the 112 - 136 MHz Band
Description
- The BPF 3/4 is a 4-helical resonator band-pass filter with aperture-coupling between the resonators.
- This filter can be used as a preselector to protect a receiver against interference from transmissions out of the passband, or it can be used to reduce spurious output from a transmitter with up to 50 W output power.
- The filter can be tuned within the entire 112 – 136 MHz band. It has very small dimensions owing to the use of helical resonators. Careful design and choice of materials ensure reliable operation over a wide temperature range.
- The housing is made of extruded aluminium, the chassis of steel, and teflon insulation has been used in the coaxial cables and in the connectors.
- The filter is coated with black vinyl to prevent corrosion.
Specification
| Electrical | |
| Model | BPF 3/4 |
|---|---|
| Filter Type | Band-pass filter |
| Frequency | 112 – 136 MHz |
| Max. Input Power | 50 W |
| Insertion Loss | ≤ 1.2 dB |
| Impedance | 50 Ω |
| Reject Attenuation | See curve |
| VSWR | < 1.5:1 |
| Bandwidth | See curve |
| Environmental | |
| Operating temperature range | -30 °C to +60 °C |
|---|---|
| Mechanical | |
| Connection(s) | N(f) (BNC(f), TNC(f), UHF(f) or SMA(f) on request) |
|---|---|
| Historic Brand | Amphenol Procom |
| Dimensions | 160 x 77 x 33 mm / 6.30 x 3.03 x 1.30 in. |
| Weight | Approx. 0.5 kg / 1.10 lb. |
Ordering Codes
| Model | Product No. |
|---|---|
| Band-Pass Filter for the 112 – 136 MHz Band | 200000858 |
Diagrams
TYPICAL RESPONSE CURVES
PROCOM A/S reserves the right to
amend specifications without prior notice
PROCOM A/S • Smedetoften 12
DK 3600 Frederikssund • Denmark
Generated : 2026-06-24
Version 1