Looking at the Lenover21 vs N2EY debate on the first voice
transmission, maybe we could make some headway by the following:

Fessenden first transmitted voice modulated spark in 1900. The reply to
the transmission was via telegraphy. In the ensuing years, there were
both spark and alternator telephony experiments. The spark had the
disadvantage of a nasty hissing component in the audio, and the
contemporary alternators were running at up to 10 kHz, not very
satisfactory, because they weren't all that much above voice frequencies.

As time went by, alternators were built that could run at much higher
frequencies.

The first two-way transatlantic telephony was performed in 1906 at a
frequency of around 88 kHz.

This is all in the historical record.

Jim accepts it, and Len appears not to.

Len, what is your rationale for that?

- Mike KB3EIA -