From G3PLX:
Gerald: Thanks for your response with comments on 1/f noise and image
balance.
I am really not convinced that 1/f noise is 'physics' in the same sense as,
for example, thermal noise is physics which we can't fight. Some circuits
exhibit what we term 1/f noise and others don't seem
On 5/24/06, Peter Martinez [EMAIL PROTECTED] wrote:
I am really not convinced that 1/f noise is 'physics' in the same sense as,
for example, thermal noise is physics which we can't fight.
Who says you can't fight thermal noise? Just use liquid nitrogen or
helium to cool your circuits!
On a
Jeff Anderson wrote:
Hi Lee,
Very interesting!
I haven't been checking my power, so I just tried the following experiment:
1. Using an Autek WM-1 meter (in Peak Mode), set my SDR1K power to 10
watts when read on this meter.
2. Transmit CW: observe RF envelope
Hi James,
At this QTH the problem is definitely at the computer output and *not* at
the SDR1K itself.
I determined this by monitoring the soundcard's output with two channels of
an oscilloscope while observing the RF envelope of my transmitted signal on
a third channel. In CW mode, the
Peter,
To Sami's comment I want add my purist's 0.02 Euro worth:
1/f noise is real, but cannot be easily seen in the present
implementation of the SDR-1000 hardware. As a good designer Gerald has
hidden it by: 1) putting the preamplifier gain so high that the noise
coming from the front end
I wonder if someone can help me out on some audio issues...
Reading back over the Delta 44 Quick Start Guide, it states to adjust
the mic gain using the ALC meter during transmit and adjust until the
peaks just reach 0db. It further says to make certain the compressor
is NOT turned on (and I
Brian,
The MIC meter is before the compressor and the compander in the TX DSP
chain. So having these on or not should not affect the input
calibration procedure. Make sure that you are using the MIC selection
on the meter though and not one of the other selections that are later
in the DSP
--- Forwarded message follows ---
From: Bill Nagle [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject:312 question
Date sent: Wed, 24 May 2006 12:33:22 -0400
I recently purchased version 312 of vac and have a question:
I
Bill:
I apologize for being unable to answer your questions. A friend of mine
just left surgery and I have been busy with that and the return to work
after a week away for business and Dayton.
I have been unable to parse your problem/explanation so I put them on
the back burner until I had
-- Forwarded message --
From: Brian Sherrod [EMAIL PROTECTED]
Date: May 24, 2006 12:17 PM
Subject: Re: [Flexradio] Delta 44 Audio settings in general
To: [EMAIL PROTECTED]
Eric,
Not the mic meter. The ALC meter. Please re-read my original
message. It refers to the Delta 44
Brian,
Changes surrounding the TX Meter selections have caused some confusion
here. The OLD ALC setting (1.4.x and before) is now the MIC setting.
It was a tap at the beginning of the DSP chain and had nothing to do
with ALC. The NEW ALC setting is a tap at the end of the DSP chain just
:
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Toby:
I wouldn't be concerned with the first 2. I've never seen that on mine and
the third one I haven't noticed. It wouldn't be enough to bother me even on
rtty. Of course with any news group you only hear the few problems and not
about the thousands that are working just fine. This radio works
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I am one experiencing some trouble with the CW issue
and I would not let that stop me from buying the
SDR-1000. I perceive no drift problem and the boys on
75 like the SDR audio better than my Orion.
So far there are only 2 of us that have reported the
CW problem to my knowledge, so it is a
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