Oh, how do you convert from WPEP to WRMS? Does it have to be converted to
voltage and multiplied by .707?

Chris
"Chris" wrote in message
k.net...
| So let's use a typical amp rated at 100 watts AM/CW/FM and 200 watts PEP
on
| SSB. Assuming that the transmitter is modulated at 100%, how many watts
| should the carrier be?
|
| Chris
| "Roy Lewallen" wrote in message
| ...
| | Chris wrote:
| |
| |
| | To reduce the drive power to an amplifier and make the modulation
| louder.
| |
| | Chris
| |
| | I see. But reducing the carrier won't make the modulation louder, only
| | more distorted.
| |
| | Well, let me back up a little. What I said is true if the modulation is
| | 100%.
| |
| | But let's suppose that the transmitter is capable of only 50%
| | modulation. In that case, you *can* make the modulation louder by
| | increasing the amount of audio applied to the carrier. If the
| | transmitter is fundamentally designed to handle 100% modulation, this
| | would require only more audio gain or a "hotter" microphone. That would
| | be the best way to make your modulation louder.
| |
| | But let's say that instead, you reduce the carrier from 4 watts to 1.
| | Then the 1 watt carrier would be 100% modulated. (100% modulation of a 4
| | watt carrier takes 2 watts. 50% modulation takes only 1/2 watt, which
| | will modulate a 1 watt carrier 100%.) Now you have 100% modulation of
| | the 1 watt carrier. There's the same amount of transmitted audio power
| | as before -- 1/2 watt --, so you're really not making the audio any
| | stronger, and no one will be able to copy you any better than before.
| | (In fact, your weaker signal will have more trouble getting through in
| | the presence of noise or interference.) But if you're the only signal
| | being heard, the receiver's AGC (automatic gain control) will react to
| | your weaker carrier by turning up the receiver's gain, making the audio
| | sound louder. The person receiving your signal can make your audio just
| | as loud with a 4 watt carrier by manually turning up the volume.
| |
| | So I'll relent and say that reducing the carrier might make your audio
| | sound louder -- but only if your transmitter is undermodulated in the
| | first place, there's no stronger signal to control the receiver AGC, and
| | if you don't reduce the carrier so much that it makes the modulation
| | exceed 100%. But your ability to get through interference and noise will
| | probably be reduced.
| |
| | Roy Lewallen, W7EL
|
|