On 6/9/2019 23:16, Bert wrote:
How would a switched PS take out a radio?
Bert VE3NR
Most likely due to overvoltage. Linear supplies are particularly
susceptible, as the series pass transistor is under stress and can
short. Switching supplies can fail if the voltage feedback loop somehow
opens up. I've not heard of it happening, but all it would take would be
one failed resistor or solder joint. I use a switching supply for my K3,
but I built an external overvoltage protector. Of course, the supply has
never failed.
BTW, I've found that the fan noise from the Samlex SEC-1235 is never
audible above the K3 fans, except during long periods of receive, when
the low speed supply fan is just barely audible. (I did the mod, so the
supply fan runs at low speed all the time.) If I transmit long enough
for the supply fan to switch to full speed, the K3 fans are already
running fast enough to drown it out. Not to mention those in the KPA-1500.
I'm very happy with the Samlex supply. I've never detected a trace of
RFI from it.
73,
Scott K9MA
--
Scott K9MA
k...@sdellington.us
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