Easy 1-Cap Command Set matching.
Video shows "stock" ATA transmitter with one 100 PFd series cap into calibrated watt meter, 50W scale and 50 Ohm dummy load. 25VDC primary power, first in CW, then Voice average power, then peak power.
https://photos.app.goo.gl/dKsLWyCz6eEGnpHE9
Not critical. 180PFd 3KV ceramic, 75 PFd mica, etc. all work as long as the cap doesn't heat while you're transmitting.
73 Dave AB5S