[hpsdr] Pandora's Box

[Jason A. Beens]

Well... if you can't get one of those more experienced folks to help
with the PA, count me in... but probably not until June. 

Jason 
KB0CDN

-----Original Message-----
From: Robert McGwier [mailto:rwmcgwier at gmail.com] 
Sent: Thursday, March 01, 2007 6:48 PM
To: Jason A. Beens
Cc: pvharman at arach.net.au; hpsdr at hpsdr.org
Subject: Re: [hpsdr] Pandora's Box

Jason A. Beens wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Nathan Sokal invented the class E topology, and patented an EER
> technique for SSB transmission back in the 70's.  I think he is a ham.
> We might try to contact him and ask if he would be interested in
> helping.

Dr. Karl Meinzer,  DJ4ZC,  wrote his Doctoral Dissertation on EER and 
even switching amplifiers in the middle 1960's.  We flew his HELAPS 
transmitter on Oscar 7 in 1974.  Sokol knows about AMSAT and Meinzer's 
work.  He donated his design tools for our efforts at doing a highly 
efficient transmitter design.

Meinzer has endorsed our doing a closed loop system if we can get it 
together or a much better open loop system than has been flown before 
using DSP correct and multiple stage modulation of the power supplies. 
You must modulate the the finals and the drivers if you are to get high 
efficiency down to low power levels.

Thanks to help from our serious friends of this list,  we have access to

all of the design tools we need to pull this entire thing off including 
these serious EER experiments.


Bob
N4HY



-- 
AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
"Taking fun as simply fun and earnestness in earnest shows
how thoroughly thou none of the two discernest." - Piet Hine



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