No, that is just selective fading.
Listen with the agc-t turned up to 70 or 80 and you might hear it.
I do not hear it with it with the agc-t set that low.
You may be in a qso with 3 or 4 people one which is weak, so unless you want
to keep adjusting the gain for each signal, you turn up the agc-t, and the
grunge starts.
Since I have installed psdr on my laptop with web access, I will attempt
make a recording of some strong signals on 80 meters.
40 meter signals are weak right now, but I hear the grunge on the laptop I
think.
Brett
N2DTS
----- Original Message -----
From: "W1AEX - Rob" <w1aex.f...@cox.net>
To: <flexradio@flex-radio.biz>
Sent: Sunday, December 18, 2011 11:36 AM
Subject: Re: [Flexradio] FlexRadio Digest, Vol 80, Issue 17
Brett, can you make an mp3 recording of what you're hearing? Maybe you
could post it to the AM forum where a number of Flex users hang out. I do
hear a buzzy quality on audio peaks during selective fades when listening
in the AM mode that I never hear with the SAM detector. When listening to
strong signals on the AM broadcast band with the AM detector stations
always sound perfect.
I made a pre-processed recording of an extremely clean AM signal (It's
another Flex so of course its clean!) on 80 meters yesterday. I then used
video/audio capture software to make two recordings as I played it back
with the AM detector and then again with the SAM detector so exactly the
same conditions are present in both recordings. The distortion that I hear
with the AM detector can be clearly heard as the signal is tossed around
during selective fading. That distortion is not present at the same points
of the second recording when the SAM detector is being used. I'm not sure
what can be done by the user to clean up the "buzzy" quality while using
the AM detector, unless some optimization can be done in the DSP tab's AGC
settings of PowerSDR.
AM detector -----> http://www.youtube.com/watch?v=AlVjEfE6Z28
SAM detector -----> http://www.youtube.com/watch?v=V9NkPXOFRmw
Does the first recording with the AM detector resemble what you are
hearing?
Rob W1AEX (Flex 5K)
On 12/17/2011 1:00 PM, flexradio-requ...@flex-radio.biz wrote:
From: "Brett Gazdzinski"<brett.gazdzin...@verizon.net>
To: "flex Reflector"<flexradio@flex-radio.biz>
Subject: [Flexradio] still broke..
Message-ID:<43105127CDB447FE80140B761C9FAF85@brettPC>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
I have a hard time believing that no one else hears this, its quite nasty
on
my radio using headphones.
--
One thing I'm certain of is that there is too much certainty in the world.
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