>You can use a class E/D
amp in linear , with envelope restoration , that
maintains the efficiency , s/n >imd
is about 35 dB .
To my knowledge the first description in amateur literature of an
EER (envelope elimination and restauration) PA (400W) was by DJ7AW in CQ-DL
4/2001.
It's still in service.
I have the article as pdf (in German) and can send it to anyone
interested in building such
a PA which is not an easy task.Therefore,as far as I know, only
two such PAs have been built.
One by DJ7AW and one in South America (Joe?).
73
Clemens
DL4RAJ
----- Original Message -----
Sent: Wednesday, September 12, 2012 5:17
PM
Subject: Re: LF: Fw: LOST TRACK
Mal,
Things have moved on a bit
You can use a class E/D
amp in linear , with envelope restoration , that
maintains the efficiency , s/n imd
is about 35 dB .
The Op structure allows for up to 50% loss
of signal randomly along the time line ,
ie first 50% , last 50% or randomly distributed
Problem with short burst is the 'average energy' level
, like a radar , huge KW peak powers but
only watts average power .....and yes , wide
bandwidth .
Detecting a carrier is one thing .. to
recover data is a much more difficult thing and
requires a higher level of energy
G..
Virendatenbank: 2437/5264 - Ausgabedatum:
12.09.2012
