One antenna that would give good performance over a DECADE of frequencies is
the disk-cone antenna.
Richard
----Original Message Follows----
From: "Larry G. Weber" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: <[EMAIL PROTECTED]>
Subject: RE: [SOCALWUG] True Software Radio
Date: Wed, 27 Oct 2004 16:00:53 -0700
The true software defined radio might be limited to the availability of an
antenna that can perform at an acceptible level of at least a VSWR of 2.0:1
across a wide wide wide very wide bandwidth. I have not seen such an
animal.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Ronan Higgins
Sent: Wednesday, October 27, 2004 3:28 PM
To: [EMAIL PROTECTED]
Subject: [SOCALWUG] True Software Radio
I received a stock-alert-spam this morning, pumping the stock of a
company called TechnoConcepts out of Van Nuys. TechnoConcepts claim to
have patents and technology for a "true software radio". One that does
not require hardware for radio signal processing.
I had always wondered why radios (cellphones, walkie talkies etc.) were
limited to certain frequency ranges and had put it down to antennae,
crystal or some such stuff.
A good friend kindly pointed out that the basic concept of a "true
software radio" is not so difficult once you have a good enough
analog/digital converter. To software convert an analog signal at
5.6GHz would require a CPU with a clock speed of at least 5.6 GHz.
Considering that current desktop PC's are at the 3GHz level, it seems
that the "true software radio" is still going to be limited to sub 3GHz
frequencies.
Any thoughts from the list on this issue, company, spam-pumped stock(!)
Ronan
