From G3PLX:
From what Ahti says, there is not a 1/f problem with the current SDR1000,
which is what I found with the earlier version, but the oscillator radiation
effect may or may not still be there.
In the last topic I raised, concerning 24 bit soundcards, I speculated that
the 'ideal' ADC
Sami Aintila wrote:
Peter,
I am seeing all kinds of nasty crud around DC, and so are many other
SDR-1000 users. On some systems - maybe with some sound cards - maybe
with better grounding - the problem is not very prominent. But for
optimal (receiver) performance it's always safer to operate at
Peter Martinez wrote:
...poor (or missing) DC coupling...really is not a problem...
As a generalization, I believe this is untrue.
73
Frank
AB2KT
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Hello Flexers,
I am in route back from Dayton where was so good to see many of you our
customers and to have many more join in the fun.
I do want to add a couple of points that have been missed here. Virtually
all professional audio cards use +4 dBu as the nominal input level. 0 dBu
is 1 mW
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Hello Flexers,
Let me clarify. Eric1 set up our laptop demo in the Dayton booth for NA9F,
who sent at up to 50 WPM per his email to me this morning. Eric set the
Firebox to 96 KHz sampling and 6 ms latency. The report from Ron was that
he noticed some latency but not a showstopper for me.
I haven't heard of this particular issue. Are you sure it is frequency
dependant, or could it be happening on other bands but it just sounds
different because of the mode/filter selections?
Eric Wachsmann
FlexRadio Systems
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL
I meant to comment earlier on this: I definitely see (hear) this also. It
is definitely not an issue on 20m, possibly not on 17m, but almost certainly
occurs on 15m and any of the higher frequency bands. Definite click on each
mouse wheel step. Doesn't seem to hurt any thing - radio tunes just
Ken,
No, it's not a USB mouse. I guess it can't hurt to try some ferrites
though.
Pete
-Original Message-
From: Ken N9VV [mailto:[EMAIL PROTECTED]
Sent: Monday, May 22, 2006 2:19 PM
To: Thompson, Peter
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED];
FlexRadio@flex-radio.biz
Let me qualify that by saying there is no latency in the monitor audio
when you use and external keyer. What goes out over the air is still a
few milliseconds behind what you hear.
It's also worth noting that the truth is that the SDR-1000 is not (and
never will be without hardware changes) a
Let me give you the skinny right from the horses mouth. Here's what I
did:
I was using a laptop (P4 ~2GHz) with a FireBox. I set the FireBox to
6ms on the FireBox control panel. This could probably go lower on a
more powerful machine. I then set the PowerSDR buffers to 512 for the
Audio and
At 02:05 AM 5/22/2006, Peter Martinez wrote:
From G3PLX:
Jim's point about poor (or missing) DC coupling probably crossed with my
answer to Frank. It really is not a problem. Jim mentioned clock noise
again, and I have to say I haven't studied this at all, but my understanding
is that it is a
Eric Wachsmann - FlexRadio wrote:
Let me give you the skinny right from the horses mouth. Here's what I
did:
I was using a laptop (P4 ~2GHz) with a FireBox. I set the FireBox to
6ms on the FireBox control panel. This could probably go lower on a
more powerful machine. I then set the
Alberto I2PHD wrote:
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Well, the reflector didn't like my HTML formatted message with an embedded
picture. This is the price we must pay for
the existence of a bunch of idiots that send out spam and viruses...so I repeat
here my message in plain text, with a
James Courtier-Dutton wrote:
Just out of curiosity, what is the real reason for the latency?
I use Linux, and users can get high quality, reliable 2ms latency on a
very modest PC. That 2ms latency is with a Linux application called
Ardour, that users use for real time audio capture, effects
At 02:03 PM 5/22/2006, James Courtier-Dutton wrote:
Eric Wachsmann - FlexRadio wrote:
Let me give you the skinny right from the horses mouth. Here's what I
did:
snipped data about short buffers, fast computers, etc.
Eric Wachsmann
FlexRadio Systems
Just out of curiosity, what is
Wachsmann FlexRadio Systems
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From G3PLX:
Alberto:
Thanks for your input! The peak in the centre of the spectrum plot you
showed at http://sundry.i2phd.com/zeropeak.gif is certainly the small DC
offset of the ADC's in the Delta 44. The Zero-IF software would remove this
of course. It can be done automatically, it doesn't
Eric,
Thanks for your response.
Since I sent my last email, I've checked this out some more and what
I find is that the click occurs on every 1 kHz step with Spur
Reduction OFF and every 3 kHz with Spur Reduction ON. If I reduce the
step to 100 Hz it happens at those same frequency
Jack,
Now we're getting somewhere. :) What you are hearing is the DDS
retuning. When this happens, you get a glitch in the audio. The reason
you only hear it every 3.051kHz when Spur Reduction is on is because we
only retune the DDS every 3.051kHz in that algorithm (fine tuning is
done in
Thanks, Eric. Yes that figures. What seemed puzzling was that without
Spur Reduction it wasn't clicking on every tuning step - like 100 Hz
for example.
OK, I'll learn to live with it.
Thanks again,
Jack
On 22 May 2006, at 23:22, Eric Wachsmann - FlexRadio wrote:
Jack,
Now we're
Alberto I2PHD wrote:
James Courtier-Dutton wrote:
Just out of curiosity, what is the real reason for the latency?
I use Linux, and users can get high quality, reliable 2ms latency on a
very modest PC. That 2ms latency is with a Linux application called
Ardour, that users use for real time
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Archive
E I think (hope) Eric was simply announcing that he has identified
that the clicks are related to the DDS tuning. I don't think he's thrown in
the towel just yet. I'd still like to know why this hasn't been reported
before (are others hearing it too) and if there is a solution. Seems
: 7.1.392 / Virus Database: 268.6.1/344 - Release Date: 5/19/2006
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It would be helpful if someone could tell me about the degree that an
image comes through in a properly adjusted SDR1000 setup? The
following is an entirely plausible situation at an existing contest
station.
40m, listening on 5 ele quad to NE suspended from and spaced across
170' of
I completely concur. The external keyer, with PTT controlled by the
keyer and internal delay of dot/dash without delay on sidetone and with
PowerSDR semi-breakin turned off, is optimal for this radio. Thanks to
Kirb's input on a bug which was fixed before the last release, I think
we
http://n4hy.smugmug.com/gallery/1477953
--
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity. Guilty as charged!
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Experience from use of existing radios...
The FT1000MP for CW has a bucket brigade delay for CW that can be set
to x milliseconds between 0 and 30. When the key is hit, if assert
transmit state to the amplifier is not already on, it is asserted
immediately. The actual CW power is delayed for x
As well, if your running with an amp and have the X2-7 delay set too
high (long delay), you will in effect, self-flagellate (is that a word?)
yourself trying to run high-speed cw with fast break-in. Using either
the internal or external keyer with semi-break-in enabled, the first
character
Guy,
Here is my experience;
The image may be nulled to about -80dBc at a fixed frequency but it will
degrade either side of this (to about -70dBc at +/- 4KHz). You can certainly
hear the image if it is strong enough.
The present software only supports one set of quadrature balance and IQ gain
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