[Icom] FW: [ic756pro2] More on the PEP Test Procedure

[Mark]

Well .. inna old daze.. the military and hams used   FOUR   as the test..
just FYI .. Mark   6dx  73 (Means "Best Regards")
----- Original Message -----
From: "Adam Farson" <farson@shaw.ca>
To: "Icom Reflector" <icom@mailman.qth.net>
Sent: Monday, July 08, 2002 9:50 PM
Subject: [Icom] FW: [ic756pro2] More on the PEP Test Procedure


> Here is some additional input received (with grateful acknowledgement)
from
> George,W5YR on the test procedure I posted earlier.
>
> 1.Prolonged uttering of the word "FIVE!" as in FIIIIIIIVVVVVVVVEEEEE!
> provides a particularly useful test signal. The succession of peaks
readily
> stands out and if the peaks are sharp and clean at their tops, you can be
> assured of a clean SSB signal without clipping or distortion.
>
> 2. Modest compression or soft peak limiting shows as a gentle rounding of
> the speech peaks, rather than the abrupt flat-topping associated with hard
> clipping.
>
> 3. Also observe the ratio of the total amount of coloured area on the
scope
> screen whilst speaking into the microphone,  as compared to the CW or RTTY
> pattern. That ratio is roughly the difference in average power between the
> key-down CW state and SSB. Compression and other processing shows up
vividly
> as an increase in the amount of coloured area displayed.
>
> 4. Note: In the CW modes - CW, RTTY, FM), average power = PEP. In SSB,
> depending on voice characteristics, average power may run 50% to 65% of
PEP.
> In properly-adjusted AM, average power at 100% modulation = 1.5 X resting
> carrier power, and PEP = 4 X resting carrier power.
>
> Best 73,