Most power supplies today have excellent regulation and to accomplish such,
provide for the voltage to ramp up from zero to the operating value over a
period of time. Now this time period may a 0.1 sec or so, but it is not
instant. Some actually use longer ramp times in the order of 1 to 2
seconds. I really don't think today's regulated power supplies "surge on"
or provide a surge at power on. At least I don't want one that does.
With that said, equally, the microprocessor MP circuits require the voltage
Vcc stable before initialization of operating parameters occur. They too
have timing circuits which delay the initialization until the power Vcc has
settled. These timing values are established by the circuit design often by
external components as simple as a series RC circuit.
Take a situation where the MP circuit begins it initialization in 0.5 sec
and the power supply ramps up in 0.8 secs. overall. Certainly viewed as a
situation that will not be happy with the MP and the operating instruction
will most likely mis-load due to the power supply changing voltage over a
0.8 sec interval and the MP ready to load at the 0.5 sec mark.
SOLUTION: Be sure the radio is off, turn the power supply on and allow it to
settle for some 1 to 5 sec and then turn the radio on. All will be happy.
73
Bob, K4TAX
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