Published a design and made a working system ........ he
also eliminated the need for a complicated drive by using
complimentary out put devices ... I don't know who else made such
a thing .... ?
>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
