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Dennis wrote:
I realize the type acceptance applied to commercially made equipment. However, I find it odd that a licensed amateur can build an amp that violates the regulations the commercial builders are required to follow. (I.E. Drive power) I'm not doubting it; just find it a little odd. :-) Licensed amateurs can do all kinds of things that commercial manufacturers cannot do! You don't have to meet a lot of the electrical safety requirements, even. For a long time, commercial broadcasters were also allowed to use non-type-accepted equipment as long as it had markings on the case saying who constructed it and when, and certifying that it met the requirements of the type. BUT, they could not sell such a homebrew transmitter to another station for use. Also, if I remember correctly, a licensed amateur can build ONE RF Amp in one calendar year. Anyone building more than one amp must apply for an FCC grant or type acceptance. (Again, please correct me if I'm wrong) I remember reading this in the ARRL handbook in the late 90's, that was over five years ago so this law may have changed. I don't remember that at all but it may well be true. I recently built a receiver which had ten RF amp modules in the IF strip. Does that violate the requirements? Are there any ARRL publications, especially the handbook, which contain plans for a linear amp which will run on 5-25 watts drive power? Probably some of the older ones do. I know that QST once did a project on an amp for the ARC-5 sets. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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