[TowerTalk] Legal Power measurement Discussion

[jimlux]

On 9/26/16 7:33 AM, James Wolf wrote:
> So, if I removed the output connector on my amplifier and wired the coax
> directly to the output relay inside, does the coax now become part of the
> amplifier?
>

It could be.. consider an absurd straw man - you've got your transmitter 
and coax inside a long airconditioning duct out to the antenna, so the 
only "connector" is a the end of the duct.  Your transmitter "box" is 
2x2x100 ft.

What about coax inside a metal raceway (conduit).

So you get into this rats nest of "where is the boundary line?"... Part 
97 is silent on this essential detail.

Ultimately, I suspect that if you're not "radiating" too much power, the 
FCC cares not where you draw the line - they show up outside your 
property with a field strength meter, not a magic probe that can see 
inside the coax.

For another oddball case: consider a resonant compact loop with the loop 
being part of the PA tank.  This is real common in consumer equipment.. 
the L in the tank is also the radiator.


> Jim - KR9U
>
>>>> Jim's right: it's not clear at all what Part 97.313 really means. It
> provides no standard for measurement and no indication where the
> measurements should be taken. You can't really say "Well, it's obvious they
> mean at the transmitter."
>
>
>
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