Telecom SPS-1335 – 30 A Switch-Mode Base Station Power Supply with Built-in DC UPS Backup
The Telecom SPS-1335 is a dedicated 13.8 V DC base station power supply engineered for operators running 100 W HF/VHF/UHF transceivers, emergency communications (EmCom) field operators, and administrators of unattended radio repeaters. With its integrated battery buffer charging and instantaneous failover circuitry, this unit delivers uninterrupted continuous power (DC UPS) wherever operational continuity during 230 V AC mains outages is mission-critical.
Key Features & User Benefits
- Integrated DC UPS buffer circuitry: Automatically switches the connected transceiver to an external 12 V backup battery upon mains failure with zero switchover latency, preventing equipment reboots and loss of contact during critical transmissions.
- 25 A continuous duty (30 A surge overhead): Delivers rock-solid DC rail stability for 100 W transceivers running demanding digital modes (FT8, RTTY) or full-power CW/SSB peaks without voltage sag.
- Low-noise switch-mode topology (< 100 mVp-p ripple): Advanced electromagnetic filtering suppresses RF hash and spurious switching artifacts, maintaining an ultra-clean receiver noise floor across amateur HF and VHF bands.
- Integrated protection suite (OVP, OCP, SCP): High-speed safety circuits automatically shut down DC output in the event of load short circuits, current overload, or overvoltage (> 16.5 V), isolating and protecting the sensitive final power amplifier (PA) stage of your transceiver.
- Adaptive maintenance charging: Supplies up to 3.5 A of regulated taper-to-float current, keeping connected lead-acid, AGM, or GEL accumulator banks fully topped up without risk of electrolyte dry-out or overcharging.
Technical Specifications
| Model |
Telecom SPS-1335 |
| Circuit Topology |
Switch-Mode (SMPS) |
| Input Voltage |
220–240 V AC ± 10%, 50 Hz |
| Output Voltage |
13.8 V DC (fixed) |
| Continuous Output Current |
25 A |
| Surge / Peak Output Current |
30 A (max.) |
| Ripple & Noise |
< 100 mVp-p |
| Overvoltage Protection (OVP) |
16.5 V ± 0.5 V |
| Supported Backup Batteries |
12 V Lead-Acid, AGM, GEL (recommended up to 40 Ah) |
| Backup Float / Charging Current |
Up to approx. 3.5 A (automatic taper to trickle charge) |
| Cooling System |
Forced air (thermostatically controlled fan) |
| Dimensions (W × H × D) |
181 × 63 × 190 mm |
| Weight |
approx. 1.52 kg |
Please note: The backup accumulator shown in product images is for illustrative purposes only and is not included with the power supply.
