Another example is the Collins 95S-1A produced some years ago. This receiver is 'Software Driven' and covers the range from 5 kilohertz to 2 GHz in steps down to 1Hz. Its architecture is hybrid. Antenna signals between 5 kHz and 30 MHz are upconverted to 51.2 MHz and directly converted from there to baseband - e.g. audio. Antenna signals between 20 MHz and 2 GHz are Directly Converted to baseband, and yes there is an overlap between 20 MHz and 30 MHz. Baseband signals are processed by DSP. Modes handled are CW, L.SB, U.SB, I.SB, FM and AM.
IMHO Direct Conversion has great performance potential, and the techniques in circuitry developed during the past decade could perhaps make Direct Conversion the architecture of choice sometime in the future. There is no doubt in my mind that SSB signals sound "better" from a DC receiver, likewise CW. 73, Geoff GM4ESD ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, March 15, 2005 3:41 AM Subject: [Elecraft] rcvr designs prc-2000 USES DIRECT CONVERSION! > He would joke about my K2 manpack. His used PRC-2000 cost over $2000. > The receiver used. DIRECT CONVERSION. THEY DID FIND A WAY TO GET RID OFALL > THE AUDIO ARTIFACTS AND IMAGES THAT WERE THE REASON WHY SUPERHET BET DIRECT > CONVERSION AS THE GOLD STANDARDOF RCVRS. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
