With the adjustments on a transmitter such as a Yaesu FT-101E, is there any purpose for an antenna tuner, or can you accomplish the same thing by adjusting the loading and other controls?
The original Yaesu FT-101 tuning instructions state the following:
Do not use antennas which are untuned or exhibit an SWR of more than 2:1.
An external antenna tuner can usually work with a much broader mismatch range. If you have a "random wire" or otherwise untuned antenna, a tuner is clearly required. A slight mismatch (2:1 or less) can be handled by the tube amplifier's controls.
The same advice will apply to other tube finals.
I don't believe an antenna tuner is needed if the power levels are 100 W or less. Doesn't your manual tell you how to attach to an antenna and how to insure that power is going to the antenna? I remember tuning the power out to a light bulb and then attaching the antenna. Anyone else remember that?