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Veronica® Low Power Band Pass Filter / FM Cavity Filter (FDB/102)
Upgrading Legacy Transmitters
If you are operating an older transmitter (pre-mid-90s) that lacks a CE Mark or FCC Certification, its internal filters may be misaligned or built to outdated specifications. A Veronica® Cavity Filter instantly cleans up your output, tightly wrapping the passband to 200 KHz. In most cases, this single hardware upgrade will bring an older, non-compliant transmitter back up to modern EU and FCC broadcasting specifications.
Precision Engineering & Operation
This is a double coaxial cavity filter featuring high-Q quarter-wave lines made of copper, silver-plated for maximum conductivity, and fitted with PTFE insulators. Installed securely between your transmitter and the antenna, the variable tuning and coupling of these lines allow the filter to wrap tightly around the passband of your 200 KHz wide FM signal.
Built solid from thick aluminum, it mounts seamlessly into a standard 3U 19-inch rack. Temperature-compensated versions are available upon request for extreme climates.
Primary Broadcast Benefits:
- ✓ Eliminates Spurious Emissions: Strongly attenuates all unwanted frequencies outside your legal passband.
- ✓ Prevents Reverse Intermodulation: Blocks strong signals from neighboring transmitters on shared sites from entering your equipment and creating illegal "ghost" signals.
Regulatory Compliance: Why Cavity Filters are Mandatory for Site Sharing
If your transmitting antenna is located within 200 meters of another broadcaster, their signal acts like a receiver. Their frequency travels down your cable, enters your transmitter's output stage, mixes with your frequency, and generates dangerous new signals (intermodulation).
If these new signals hit the 118 MHz to 136 MHz aviation band, you will directly interfere with airport control towers and commercial aircraft navigation. Because of this extreme danger, telecommunications authorities now enforce strict ITU-R standards requiring cavity filters for site approval.
Strict Enforcement Across Africa
Our Veronica® FDB/102 Cavity Filters guarantee compliance and are considered a mandatory technical requirement to pass site inspections with the following agencies:
- ✓ South Africa (ICASA): Strict enforcement against intermodulation on shared commercial masts.
- ✓ Kenya (CA): Zero tolerance for aviation band interference and spectrum pollution.
- ✓ Nigeria (NBC): Required for co-located urban community and regional broadcast transmitters.
- ✓ Uganda (UCC): Mandatory RF filtering to protect neighboring frequencies in crowded spectrums.
- ✓ Ghana (NCA): Essential for passing mandatory pre-broadcast site inspections.
Don't risk station closure, equipment confiscation, or heavy fines. The Veronica® Cavity Filter physically blocks external frequencies from entering your system, keeping your output 100% clean, legal, and safely on the air.
| Technical Specification | Performance / Rating |
|---|---|
| Insertion Loss | 0.4 - 0.9 dB |
| Frequency Band | 87.5 - 108 MHz |
| Impedance | 50 Ohm |
| Power Handling | 100 - 200W |
| Bandwidth (-3db) | 150 - 300 KHz |
| Operating Temperature | 10°C - 40°C |
| V.S.W.R. | < 1.15 : 1 |
| Ideal for use with all Aareff Transmitters | |
Do You Have A Question?
Our engineering team is ready to help you ensure complete regulatory compliance for your specific site.
