[AMRadio] AM worldwide

[Rob Atkinson]

Geoff was I think, referring to 100 watt pee ee pee plastic radios,
that have to operate at around 20 or 25 watts carrier, and comparing
those to the ART13.  It's true-- on AM the ART-13 is 4 times more
powerful.

There is a guy named Bruce, K7DYY who has a small business called
Index Laboratories, who makes and sells solid state Class D rigs but
in my opinion overall, tube rigs are still superior to what he has,
because they seem to be more robust into ham antenna impedances as
hams usually do not have nice stable and broad bandwidth (in terms of
vswr) loads.   I've never owned one, but from what I've read and
heard, they are fussy to operate but are popular with fellows who no
longer want to deal with the weight of a high power plate modulated
tube rig.

73

Rob
K5UJ


On Fri, Aug 24, 2018 at 8:50 PM W2xj <w2xj at w2xj.net> wrote:
>
> You have a point but maybe you don’t. It’s obvious that a typical solid state rig with a linear amplifier requires 6 dB headroom when driven in AM mode. But that doesn’t make them ‘gutless’. If they can make the FCC limit of 1500 watts PEP on SSB then they can do it on AM as well.
>
> Actually solid state AM designs have more guts than tubes. Class E final, switching modulator and higher efficiency. It’s just that no one manufactures such a design for amateur service but they are the norm for broadcast.
>
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