Scott:
Well, the DDC/DUC (Direct Down/UP Conversion) has
a single A/D converter followed by digital quadrature
mixer in the form of an FPGA which outputs a digital I,Q
stream. QSD RXs have a hybrid quadrature mixer (basically
analog) followed by two A/D converters producing the I,Q
stream. For those unfamiliar with the notation, the I and Q
digital signals are in 90 deg. quadrature where Q = HT(I)
(Hilbert Transform) required for later demodulation.
73, Gary
Note: During this trick, no Hams were harmed.
On 8/30/2015 14:35, Scott Royall via BVARC wrote:
What’s the difference?
*From:*BVARC [mailto:[email protected]] *On Behalf Of *Gary
Sitton via BVARC
*Sent:* Sunday, August 30, 2015 14:12
*To:* BRAZOS VALLEY AMATEUR RADIO CLUB <[email protected]>
*Cc:* Gary Sitton <[email protected]>
*Subject:* Re: [BVARC] New Icom Rig -- IC 7300
Ron:
The Flex 5000 was the 1st DDC/DUC from Flex,
but the 1000, 1500, and 3000 used QSD which is
a cheaper direct sampling technology as have many
other SDRs in the last 10 years or so.
Gary
On 8/30/2015 09:08, K5HM via BVARC wrote:
ICOM is claiming that they are the first to offer direct sampling
. I thought that most of the new Flex line already did that.
Seems that all new rigs now claim they are SDR. Whatever that is.
73,
Ron, K5HM
[email protected] <mailto:[email protected]>
www.qrz.com/db/k5hm <http://www.qrz.com/db/k5hm>
ARRL Logologo (2)smaller Prize
*Excelsior!*
*From:* BVARC [mailto:[email protected]] *On Behalf Of *Rick
Hiller via BVARC
*Sent:* Saturday, August 29, 2015 6:20 PM
*To:* 'BRAZOS VALLEY AMATEUR RADIO CLUB' <[email protected]>
<mailto:[email protected]>
*Cc:* [email protected] <mailto:[email protected]>
*Subject:* [BVARC] New Icom Rig -- IC 7300
EXTRA, EXTRA, READ ALL ABOUT IT……..
ICOM IC-7300 SDR
http://www.icomamerica.com/en/products/amateur/hf/7300/default.aspx
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