In article ,
John wrote:
Craig wrote:

UltraJohn wrote in message
nk.net...



What is it a tube type final? 45 watt should only require about 60 watt
input for the final plus maybe another 20 watt for the rest of the rig
including drivers (if it's transistor). That's less than 7 amps give it
at least 50% cushion would be around 10 amps so why 3 times the current
for the breaker?

Sorry for taking so long but I've had all the systems down due to some
ISP induced problems for the last few days.

Doubt it's a tube final (Motorola MCX1000), but I did take a better
look at the power cord this morning as I was getting ready to fab a
new mount for the van for it. Has a 3 amp control line and a 15 amp
main power line. The 30 amp line was a feed for some other gear for
the truck and just happened to be laying on the wire bundle when I
looked at it last week,

Craig C.

I can accept that a lot easier ;-) Still quite a bit overkill so trying to
figure out what kind of electrical system capacity to power it along with
all the other gear in the plane I think you could figure a lot less.
Have a great day
John
kc5vb (but mostly inactive (got into it to tinker with electronics which is
both my hobby and profession!))


Part of it is probably due to the fact that Motorola rigs are well known
for actual RF output _well_ above the 'nominal' output. I used to use a
nominal 30 watt VHF hi-band unit where the actual RF out was just over 47
watts. Every time I took it into the radio shop to have the cavities tweaked,
they insisted on doing a TX test. *Despite* my warning them about the output
level, they'd blow the attenuator on the test instrument every time. After
the puff of smoke, the urge to say "I told you so" was nearly overwhelming.