[AMRadio] sdr-iq


Jay Bromley jayw5jay at cox.net
Wed Feb 10 16:00:55 EST 2010


Hi Bernie,
I am running a Perseus SDR receiver with 2.5 GHz Asus quad core CPU and 8 MB 
of ram.  The OS is Win 7 64 bit.  No echo here unless I am sync up to the 
Icom receiver and trying to use them both at the same time.  There is a 
little bit of latency with the SDR.  The sound is very good and the Sync 
detector is the best I have used so far.  It's a little on the noisy side 
with no signals.  A hint was given on the reflector to bump up the AGC 
threshold and that seems help some.  Also a suggestion from Robert, W0VMC, 
was to use a better sound card instead of the internal sound card that is on 
the motherboard.  The Perseus doesn't use the sound card for demodulation, 
but for audio out.  In a way I wish the receiver had it's own line level out 
instead of using the computer's sound card.  A better sound card with more 
ram should off load the CPU, but not sure that would help the latency much? 
I am mainly wanting to lower the noise floor even more if that is possible. 
The spectrum scope and waterfall are very useful.  I got another program 
called HF span that makes it into a nice 40 MHz spectrum analyzer.  Overall 
a very powerful box.

73 de w5jay/jay..

--------------------------------------------------
From: "Bernie Doran" <qedconsultants at embarqmail.com>
Sent: Wednesday, February 10, 2010 12:02 PM
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Subject: [AMRadio] sdr-iq

> I purchased an SDR-iQ about five weeks ago and while it performs great in 
> a
> number of areas it seems to be poor in the audio demodulation, at least on
> AM,  I am getting what sounds like a low level echo and a general 
> artificial
> quality of sound, my 75A2 sounds much better and that certainly is not 
> good
> quality audio. it is difficult to copy a moderate level AM signal. the
> computer plays DVDs and CDs fine and sounds good. I talked to the store 
> that
> I purchased it from and they said they have heard this before and that I
> should not expect it to sound like a VT receiver!!!!! that was a  shock,
> what did I buy it for?.  computer is a single core 2.8 gig, it shows it
> running at about %75. any one else use these things? or have experience 
> with
> the Flex 5000a? Bernie
>
>
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