N2EY wrote:
Leo writes:
To propose that today would be quite
difficult to justify - most folks never even take the cover off their
radios anymore, let alone design one from scratch.....

But some of us (ahem) *do* design them and build them from scratch. Amateur
radio is probably the only radio service where a licensee can simply assemble a
transmitter and put it on the air without any formal type-acceptance, approval
or certification - at least here in the lower 50 provinces.

Part 15 allows this as well, though I guess one could debate whether
this qualifies as a "radio service":

Sec. 15.23 Home-built devices.

(a) Equipment authorization is not required for devices that are not
marketed, are not constructed from a kit, and are built in quantities of
five or less for personal use.
(b) It is recognized that the individual builder of home-built
equipment may not possess the means to perform the measurements for
determining compliance with the regulations. In this case, the builder
is expected to employ good engineering practices to meet the specified
technical standards to the greatest extent practicable. The provisions
of Sec. 15.5 apply to this equipment.

Dennis Ferguson