ad5hr1 at yahoo.com
Sat Mar 27 22:07:50 EDT 2010
Don't know enough about the 5000's receiver, but a couple years
ago, I talked with W5GI on 3.880 as he was shaking out the prototype.
None the "old buzzards", nor I, could tell it from a plate-modulated
rig. I've heard several on the air since, and they seem to have pretty
decent transmit audio, guess all the modern digital processing in the
computer helps out there?
Who am I to talk? I run a single 5763, modulated by a pair of 6AQ5's
into an SB221 for 100W., and listen on an HQ-140A,or FT-847 ricebox
when the QRN,QRM,etc. gets nasty. Wish I had a "real"RX, R-399, 75-A.
etc. Maybe someday.HI
I'm burning all the lights, idling both trucks, and dumping 1500W.
into the 15M. ant., trying to work B1Z on 15M in the WPX contest.
Happy Earth Hour
--- On Sat, 3/27/10, Brett Gazdzinski <Brett.Gazdzinski at verizon.net> wrote:
> From: Brett Gazdzinski <Brett.Gazdzinski at verizon.net>
> Subject: Re: [AMRadio] sdr-iq
> To: "Discussion of AM Radio in the Amateur Service" <amradio at mailman.qth.net>
> Date: Saturday, March 27, 2010, 8:16 PM
> Did you try adjusting the rf and IF
> gain settings? The IF gain adds a lot of
> noise using spectravue...
> Also, what programs did you use with the sdr-iq?
> Winrad seems to have much better audio with less noise.
> I don't often use the sdr-iq as a receiver, sometimes I use
> it to listen in
> the den, as its very small and I am using the laptop
> The flex 5000 seems to be a very good receiver.
> Maybe its not quite the same as an old tube receiver, but
> has other
> It can handle 150% modulation with its sync detector,
> It can do diversity, and noise null,
> The filters are fantastic, and you can set them as wide or
> as narrow as you
> want, and slide them around to get rid of qrm,
> The frequency response can be whatever you want, down below
> 20 Hz.
> You get a great band scope.
> You can record audio right off the air without altering it
> (and play it back
> over the air as well).
> Its all mode.
> For weak AM signals, the homebrew seems to be just a slight
> bit better, but
> the homebrew receivers are much better than anything else I
> ever owned,
> better then the R390a.
> I usually use both, the homebrew for audio and scope
> output, the 5000 as a
> band scope, and sometimes for the filters when things get
> tight. On the
> flex, you can slide the passband 25 Hz off a carrier and
> its gone.
> ----- Original Message -----
> From: "Bernie Doran" <qedconsultants at embarqmail.com>
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Sent: Saturday, March 27, 2010 1:13 PM
> Subject: [AMRadio] sdr-iq
> > well I am going to stir the pot again with my probable
> final comments on
> > my
> > SDR-IQ. first the good, never had a panadapter
> or bandscope, it works
> > great
> > for that. The filters are very good. The issues
> to me are the following,
> > it
> > is noisy, to itself and also to a receiver on the same
> antenna, it lacks
> > sensitivity, it has spurs, and the big one to me
> is the audio quality, a
> > moderate strength AM signal is difficult to understand
> and when on my
> > hollow
> > state stuff it is nearly %100 copy. The present
> computer is a 2.2gig quad
> > core, no performance change above a single core 1.8
> gig. Numerous
> > different audio systems confirm that it is the nature
> of the beast.
> > I have read numerous articles on D-A and A-D
> processing and believe that
> > 14
> > bit is not going to do the job that I want. I
> suspect 24 bit and a much
> > higher sampling rate, 150 meg? would just about
> cure the audio issue for
> > me. I am starting to believe that the glowing
> reports written about SDR
> > are
> > prepared by those that have never used an old VT
> receiver or have one
> > available to run beside the sdr. My FT1000 Mark V had
> glowing reports and
> > I
> > am really disappointed with it. I have an ever
> deepening respect for
> > those
> > that designed and built the old classic
> receivers. Looking at noise
> > figures
> > and sensitivity on those old dogs places them very
> close to theoretical
> > limits, pretty amazing. I have put my money
> where my mouth, I should,
> > about
> > April 10 or so have a completely reman
> R-390A. I was going to try the
> > Flex
> > 5000, but as I posted earlier they did not see fit to
> respond to my
> > questions, perhaps thinking the questions were
> not fit to respond too.
> > Earth hour is today, be sure to turn on all of your
> lights to help save
> > the
> > grid and generators. ! Bernie W8RPW
> > Our Main Website: http://www.amfone.net
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