[hpsdr] Pandora's Box

[Robert McGwier]

You are most welcome to participate here.  I have noticed very little of 
the NIH green eyed monster here! The Phil's have given us some serious 
tools in Mercury and Penelope to experiment with all sorts of neat 
wideband designs and narrow band designs using them as DDC's and DUC's 
respectively.

Bob



Jason A. Beens wrote:
> 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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