|[AMRadio] power ratings|
w5omr at satx.rr.com
Tue Jul 12 14:36:45 EDT 2005
Donald Chester wrote:
>> The plate dissipation of the 6146's is the key. Your carrier steady on
>> should not exceed the dissipation rating. This is about 50 watts if I
>> remember right which would give you 200 watts PEP. So your power suppl;y
>> should be capable of about 150 watts continuous and it will handle
>> the 200
>> watts on peaks. I would beef up the fan so that I had a good amount
>> of air
>> passing the glass of the 6146's to keep the seals cool.
> In AM linear service, the carrier output should not exceed HALF the
> total plate dissipation. A 6146 runs about 25 watts plate
> dissipation, so with a pair of them, you should be able to run 25
> watts out. With 100% modulation in the positive direction, that would
> be 100 watts pep.
> A properly functioning AM final capable of 100% modulation should run
> about 33% carrier efficiency. That means that two-thirds of the input
> power is dissipated in the plates of the final, and one third is
> delivered as rf output.
> When the carrier is modulated, the final actually becomes more
> efficient, so the plate dissipation is reduced under modulated
> conditions. The DC input should not vary, so that simply means that
> some of the DC input that was being dissipated as heat is now being
> converted to rf output in the form of sideband power.
Is that where sideband energy then is created and therefore exists as
long as there's a modulate AM carrier?
I wasn't in on the big discussion about this, a few months ago.
73 = Best Regards,
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