I am hoping that CREE makes a 50w output device and we build one amplifier to make the thing so we can run at 50w PEP and smaller ones for the N amplifier/antenna version. I am wondering about the SDX/HELAPS on the multiple amplifier version. It will be easier for Dick to cool but harder for our HELAPS so that is the note of caution I sound. I like everything about it except contemplating that. Our HELAPS will be sensor based and heavily dependent on predistortion to achieve the best performance. We might be pushing the SDX/HPSDR Sasquatch to the limit controlling three amplifiers. If we really are going to try to get total DC efficiency well over 50% for the transponder and get good IMD, we will need the polyphase DSP HELAPS to work.
These E/I curves are looking really good if the simulation approaches reality. I would like comments ASAP for Marc.
We are getting well down the road on the HPSDR developments. When Lyle gets back from Oz, that project should take a leap forward. A bunch of our SDX hardware will be from that project (in prototype form).
Bob
Dick Jansson-rr wrote:
Tom has an intesting suggestion of the 3x amplifiers/antennas. I have been suggesting this antenna configuration as I just take the P3C hardware and use it! Please help my poor brain understand how this gets the desired RHCP? Is is just the three rotationally oriented antennas?
Dick Jansson
rjansson@cfl.rr.com
-----Original Message----- From: eagle-bounces@amsat.org [mailto:eagle-bounces@amsat.org] On Behalf Of Tom Clark, K3IO Sent: Friday, 18 August, 2006 2253 To: Robert McGwier Cc: 'EAGLE' Subject: [eagle] Re: 2 Meter amplifier
Robert McGwier wrote:
Apologies. I know CREE is a leading company in GaN and I leaped without being careful. This is SiC technology.
Bob