On Aug 29, 11:37 pm, " Peter" wrote:
How does the VoiceMax recognise 100% modulation?
Does it not simply hold it at whatever maximum the person with
the screwdriver sets the radio to? You know, the guy who you
told to crank thre radio up when fitting the VoiceMax.

Yes... Voicemax has an adjustable fast-acting limiter. During the set
up (see http://www.telstar-electronics.com/VoiceMax%20B.pdf) this
limiter is adjusted so the output envelope (AM) is at 100% modulation
during speech. On FM... it's obviously the deviation that is set for
the maximum allowable bandwidth. VoiceMax will then hold these levels
from then on... regardless of the speech input level. The one
exception is below the point where the user adjusts the noise-gate
threshold. This is a point... below which the audio is muted
significanly. This is a necessary feature in a very high gain (+60dB)
AGC circuit to eliminate amplifying low level background noise to
limiting levels. So what you end up with is very potent undistorted
audio... with no background hissing. This is extremely effective in a
mobile environment.
www.telstar-electronics.com