Post by Sandbagger on Feb 13, 2015 7:30:34 GMT -5
IIRC, the 99V is a dual final radio similar to an RCI-2950 in the output stage. The radio should do about 35 watts PEP. A 5 amp power supply is barely enough to run it, if you stay on AM. But if you aren't pushing it to its absolute maximum power out, it should be able to handle it. But a 10 amp supply would give you a little extra reserve in case you want to push the power to the limit. If you exceed the power supply's capability, the radio will not be harmed, but the voltage will sag which will show up as dimming meter lights, and the transmit frequency may "FM" (warble) due to varying voltage.
When figuring out how much amperage you need for a particular amplifier, you can calculate a ballpark figure by simply taking the actual power output that amp is capable of (which is usually not what a Dosy (doh!) meter will tell you
), multiply it by 1.7 and then divide it by the voltage (13.8V). So if the amp is doing an honest 250 watts, you can figure that it's going to draw somewhere near 30 amps, so you should figure on a 40 amp supply minimum to give you a little extra reserve power.
