>
>Not that I operate AM, only made 1 qso on that mode...
>
>But can someone explain to me why you can or can't use a linear on AM? >
100% modulation
>An electronically challenged extra...
>
You can use a linear on AM. With a modern radio as the driver, very low
distortion AM is typically produced. Plate modulation does not produce
nearly as low of a distortion level. . It is important to tune up an AM
linear at the max pep output from the exciter, and then to adjust the
carrier control for 25% of max pep. In typical use, the AM linear will
indicate roughly half of max. anode current under carrier conditions.
With modulation, indicated anode-current should barely wiggle. At max
pep output, efficiency is around 60%. A typical 1500w SSB amplifier will
typically make about 375w of carrier with 100% modulation. Since no
heavy modulation transformer and no modulator ps are needed, AM linears
typically weigh less and are more compact than an old fashioned lashup.
later, Phil.
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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