[ARC5] RF Ammeter Puzzle

[J Forster]

I have come across a puzzle on RF Ammeters.

The ART-13 uses a TC meter with 5 A FS and the ARC-5 uses a TC meter
with 10 A FS, yet the ART-13 is a higher power Tx. There is a current
transformer in the ARC-5's BC-442, but it seems to be a 1:1 ratio.

Is the RF Ammeter in the ART-13 somehow not in the antenna line (but at
some higher impedance point in the circuit) ? I don't have ART-13 prints
to hand

Best,
-John