I'm building a low-power shack to operate on non-licensed bands (UHF PMR 0.5W + HF CB 4W). I don't have any "RF-grade" sources of 12(-ish) volts and don't want to buy a specialised power unit.
I'm thinking of running the whole setup from a 12V battery (VRLA / NiCd / LiPoFe4).
Here're my thoughts; am I missing something?
- Cheaper than a dedicated RF-grade power supply (USD30 for 40 Ah car battery)
- No interference from AC mains and/or cheap power supply
- Safer: no risks of electric shock (no AC mains on my table)
- Lightning safety: the equipment is not connected to the house AC, so potential bolt would only damage the radios
- No need to re-wire mains / use lengthening cable if I decide to move table
- Blackout proof :)
Cons (with my refutal ;)
- Runtime [not a problem, I do not expect avg drain to be much more than 1A, so even a small car battery would give me over 20 hours, more than enough]
- Need to charge [I'm not operating the rig 24/7 so not an issue]
- Voltage drop when battery is not fully charged [might be small, depending on chemistry... and actually, cheap power supply that I'm using now drops from 12V when idle to 10V when Tx'ing, and the radio is still working]
- Safety issues with large batteries sitting alone and unsupervised [I will disconnect it every time and can stove it in shed when I'm away]
- Limited lifespan of batteries [before the battery would die of old age/overuse, I'd either lose interest or decide to build something bigger anyway :)]