开云体育

Any 11V to 15V 2A PSU is fine, even SMPSU if low RF noise. A "rig" 13.8 V supply can be used but wasteful compared to 12 V. I've used decent 12V 2 A SMPUs from scrapped router/modems that made no difference to LW/MW/ HF RX noise level,

Recently I changed to using a Yaesu E-DC-5B (I was given with a VX5R) that plugs into the Cigar lighter socket on my K-PO SPS-250 II. It's an RF quiet SMPSU I bought for my FTdx10 from Classic Radio International in Netherlands with the rig as they are much cheaper than UK or Irish dealers. I bought my FT817ND there too in 2006 and though in real terms value has fallen, the euro S/H price in Ireland for the FT817ND is more than what I paid in 2006.

I also use a 12V 9 AH gel cell (also used with my Pi via a 5V adaptor, but a few deep discharges destroy those). I replaced the internal 1800 mAH with 2500+ mAH NiMH (I found the 2700 models have a high self discharge), which might need charged twice on the timer. I also have a small solar panel only good for charging (folds and opens to about A4/Letter size) in direct sunlight. But even my home solar panels (more than rated 430W in suitable sunlight) only give 10 W each on a rainy day in October.

A PC SMPSU isn't a good idea as those need loaded on +5V and/or +3.3V or the +12V rail is only about 9.5V. Many are also lacking in RF filtering. I have used a car headlamp bulb once on 5V rail to use a PC SMPSU on 12V, but even for a CB it was poor. I also tried the recommended power increase circuit for an LM317 with two external transistors for a 13.8 V @ 15 A linear PSU but layout and decoupling is tricky to avoid a lot of RF or instability generally. It powers a couple of CBs, but doesn't manage more than 10A. However even the higher power version of the LM317 suitable for a linear PSU only works with careful layout and choice of capacitors. PCB or parts direct on legs of IC on heatsink as earth is recommended.a