One of the most helpful things (to me) that has come from this group has
been the occassional well thought out treatise on "we should do things
this way"
My favorite examples are 1) Phil Harman's paper on agc which has led to
a great improvement in that area (and will lead to more) and 2) the
descriptions of what is needed to aid the audio processing given by the
audio experts (W5GI, et. alia). This radio should be the very best AM
transmitter period. If someone were to put together a paper like
Phil's agc paper, where a concise description of the ideal was
presented, it would be helpful.
Bob
Charles Greene wrote:
Mike,
Good tip. I reversed two phone plugs going into my Fire Box. Now I
could zero the TX image when on AM. As measured on the spectrum
analyzer, on AM, while transmitting into the dummy load, the image at
7.0785 Khz is 40 dB below the signal at 7.1 Mhz. Image down the same
on CW. Settings on TX image reduction are phase -1 and gain 10. I
redid the RX image reduction to be sure, and it came out a little
different: phase -1.75 and gain 3.44. It sounds good now on SSB and AM.
tnx, Chas, W1CG
At 08:27 AM 2/1/2006, Mike WA8BXN wrote:
I had a problem of transmitting two AM signals at the same time, one of the
audio cables was not firmly seated in the SDR-1000. One of these days I
ought to take it apart and enlarge the holes in the chassis so that is less
likely to happen. If you just got one signal on 3.878 and little on 3.9,
then it sounds like the left and right are reversed on audio going into the
sdr-1000.
73 - Mike WA8BXN
-------Original Message-------
From: Charles Greene
Date: 02/01/06 08:16:32
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Frequency on AM
GM,
I was trying to do some image reduction on the TX signal, and I set
up a distant receiver and set the PowerSDR Console to AM. The
transmitted signal was on 3.9 Mhz and the receiver read 3.878
KHz. On SSB and CW, signal frequency is right on. Tried another
receiver, the same. Put on a spectrum analyzer and tried to reduce
the image using phase and gain. Best I could get it was the primary
signal was 15 dB down from the image with the phase control all the
way to the left. Recalibrated RX level and image
rejection. Settings were phase -1, gain 2.63. Set the TX phase and
gain to those settings. Can't see the image signal on the spectrum analyzer.
Evidently there is a problem on AM, not that I use it, but is it my
set or does anyone else experience it?
73, Chas W1CG
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