Well put and exactly correct Gary! I have observed exactly the same with
both an oscilloscope and many different types of peak reading
watt-meters. Bird included.
73
Jim W7RY
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of Gary Schafer
Sent: Tuesday, July 18, 2006 8:33 AM
To: edk0kl@centurytel.net; amps@contesting.com
Subject: Re: [Amps] Amps Digest, Vol 43, Issue 70
SSB can only be less total power, which results in good
> sounding signals (no clipping). But, I submit to assume PEP is 2x CW
and
> assume the tubes can go that high is troublesome.
>
PEP is the easiest and most complete way to express the output power of
an
SSB transmitter. The problem is that understanding what PEP is seems to
get
in the way many times. If you read the definition below and think about
what
it says things make sense.
"Peak envelope power is the average power supplied to the antenna
transmission line by a transmitter during one radio frequency cycle at
the
crest of the modulation envelope, under normal operating conditions."
This means that "key down" or CW carrier output power is also PEAK
ENVELOPE
POWER.
However, peak envelope power (PEP) can be a little higher on SSB than
CW
output power because the dynamic plate voltage regulation is often
better
(higher plate voltage maintained) in SSB than with the constant load of
a
carrier. This may result in a 10% or so higher PEP in SSB than in CW or
"key
down" mode. But there is no 2X "key down" relationship between SSB PEP
and
CW.
73
Gary K4FMX
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