| Broadcast frequency | Usually within the VHF FM broadcast band of 87.5–108 MHz; some markets use a narrower allocation. | A transmitter must operate within the frequency plan permitted in the destination country. | Confirm the locally permitted band, channel spacing, and frequency-assignment procedure with the national regulator. |
| Channel spacing | Common plans use 100 kHz or 200 kHz spacing, while other spacing values may apply by market. | Incorrect spacing can cause adjacent-channel interference or prevent legal frequency assignment. | Check the regional frequency table and ensure the transmitter supports the required tuning increments. |
| Regulatory authorization | Most broadcast installations require a license, assigned frequency, or other approval before operation. | A technically compatible device may still be unlawful to operate without authorization. | Identify the responsible authority, license class, permitted power, antenna location, and emission limits before purchase. |
| RF output power | Commercial equipment may range from low-power units to transmitters rated at several kilowatts; legal limits vary by service and location. | Higher power does not automatically provide better coverage and may require additional licensing, cooling, and infrastructure. | Match rated power to the authorized effective radiated power, site coverage plan, and antenna system. |
| Frequency stability | A temperature-compensated or oven-controlled reference may be used where tighter frequency accuracy is required. | Stable frequency operation helps reduce drift and the risk of interference with neighboring assignments. | Review the specified frequency tolerance, warm-up behavior, and performance across the rated temperature range. |
| Audio compatibility | Common inputs include balanced analog audio, unbalanced analog audio, and digital interfaces; 50 µs or 75 µs pre-emphasis may apply by region. | Matching audio interfaces and processing standards helps avoid distortion, low loudness, or incorrect spectral balance. | Confirm connector type, input level, impedance, stereo encoding, pilot tone, and regional pre-emphasis setting. |
| Emission and spectral limits | The transmitter should meet the applicable limits for occupied bandwidth, unwanted emissions, harmonics, and spurious radiation. | Clean emissions protect other radio services and support regulatory approval. | Request test data or conformity documentation relevant to the destination market and operating power. |
| Electrical supply | AC systems commonly use approximately 100–127 V or 220–240 V, with 50 Hz or 60 Hz mains depending on the country. | A mismatched supply can damage equipment, reduce reliability, or require costly electrical conversion. | Verify input voltage range, frequency, phase requirement, plug type, breaker rating, grounding, and surge protection. |
| Cooling and ventilation | Air-cooled systems require unobstructed airflow; higher-power installations may need dedicated ventilation or climate control. | Excess heat can shorten component life and trigger protective shutdowns. | Check heat output, fan arrangement, clearance requirements, ambient temperature limits, and filter-maintenance procedures. |
| Antenna and transmission line | The antenna, feeder, connectors, and transmitter should be designed for the operating frequency and forward power. | Impedance mismatch and feeder loss reduce coverage and can activate reflected-power protection. | Use the specified impedance, commonly 50 ohms for RF systems, and verify VSWR, connector type, cable loss, and lightning protection. |
| Installation location | A secure, dry, clean, and adequately ventilated technical room is generally preferred. | The site affects equipment life, operator safety, maintenance access, and electromagnetic compatibility. | Assess humidity, dust, vibration, altitude, fire protection, rack space, cable routing, and access control. |
| Grounding and lightning protection | A properly bonded site earth, surge protection, and suitable antenna discharge and lightning-protection measures are essential. | Outdoor antenna systems are exposed to static buildup and lightning-related transients. | Have the installation assessed by a qualified electrical or RF professional in accordance with local codes. |
| Monitoring and protection | Useful functions include forward/reflected power monitoring, over-temperature protection, alarms, and remote status reporting. | Monitoring reduces downtime and helps operators identify antenna, cooling, or power faults quickly. | Confirm alarm contacts, remote-management protocols, display accuracy, event logging, and safe fault-recovery behavior. |
| Maintenance and spare parts | Routine tasks may include cleaning air filters, inspecting RF connectors, checking cooling fans, and verifying output measurements. | Local service capability and spare-part availability are important for installations far from the supplier. | Evaluate manuals, diagnostic tools, training, replacement-part lead times, warranty terms, and authorized service options. |
| Documentation and conformity | Technical files may include specifications, wiring diagrams, user manuals, test reports, declarations, and safety information. | Complete documentation supports customs clearance, installation, licensing, maintenance, and compliance reviews. | Request destination-market documentation before ordering and confirm that ratings match the exact supplied configuration. |