HF Field Radios and Battery Operation – Quick Notes
All radios are classified as 12 V but are actually specified to be at 13.8 Volts.
If you use an SLA that is 12V then current drain and voltage drop will pull the voltage lower and they radio will turn itself off. Thus, it is better to use a Lipo or Life4 battery rated at 13.2 volts.
I operate a man pack RF power of 20 watts. It has lower current drain and is only about 1 S unit lower than a typical 80-100 watt station.
Running a HF 100 watt radio at 20 watts may still draw about 8 Amps of power due to internal circuitry optimized for high power not lower power.
Operating CW or 2m FM will cause the current drain to be constant where on SSB it will fluctuate with the voice wave.
Thus a 5-10A SLA will prove a poor choice and limit operation greatly.
A 10A 13.2v Bioenno battery will prove better in operating time and be lighter as well.
The Xiegu G90 is designed as a 20 watt radio and will draw about 4-5 Amps.
The Icom 705 with its 1800 MaH BP-272 battery supports operating at 10 Watts
BUY A PROPER LIPO OR LIFE4 BATTERY AND THROW THE SLA’S IN THE RECYLER BIN