Gary Schafer wrote:
Here is a ruff rule of thumb for amps on AM:
If the amp takes 100 watts to drive it on ssb then it will take 100
watts pep of AM to drive it. 100 watts pep of AM means 25 watts of
carrier with 100% modulation.
Kinda Sorta. Depends on the quality of the transmitter. If he
reduces the carrier output power of the Ranger, then the audio
output power will rise, because there won't be as much final
current flowing through the secondary of the modulation
transformer. Depending on the impedance match of the final to
the modulator through the mod transformer, determins how much
more audio will be gained (or lost) when power is reduced from
the exciter. That, and the natural asymetricalness of the
operators voice. Lowering the output power, more audio, a 3:1 SR
(Symmetry Ratio), the 25w of carrier could contain as much as
200w PEP. In order for the linear to 'cleanly' reproduce the
audio, it's going to need more than what the plates of a pair of
3-500Z's can deliver (*note: I said "Cleanly")
In the real world, there's likely to be some distortion, unless
the carrier can be dropped down to around 10 to 12watts output of
the Ranger.
73 = Best Regards,
-Geoff/W5OMR
