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
[email protected]
-----Original Message----- From: [email protected] [mailto:[email protected]] 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