[mdmars_members] cascade repeater inverted speach recording and thoughts

  • From: J Sears <aat3ok@xxxxxxxxx>
  • To: AIG-2 <mdmars_members@xxxxxxxxxxxxx>
  • Date: Thu, 15 Oct 2009 18:28:22 -0700 (PDT)

Ok everyone, I have attached is a .wav file from the cascade repeater. I have 
edited out (deleted) all of the ID and other voice extraneous signals not 
pertinent to the clip (yes Wayne I deleted you too).  Most windows operating 
systems play this file without any problems.  
When you listen carefully you will notice that it sounds remarkably similar to 
a SSB signal when tuned to the wrong side band except that it is more 
constrained (the voice is compressed to a narrower passband, roughly from say 
80 hz to about 1200 hz.  
Something else popped out at me when I listened to the raw data. That is some 
of the signals present are chopping out of the (their) radio I believe. This 
leads to speculation that we may never find this signal locally and that it 
could be a rogue community repeater operated somewhere in PA, elsewhere in 
Maryland or even in Virginia or DC. 
It is also interesting that there appears to be specific and repeatable times 
when you hear this signal and that is from approximately 8am to 9:30 am  and 
from approximately 1pm to approximately 3pm. 
In the near future we intend to replace the duplexer with one that has been 
tuned up and treated with tender loving care (transported on my back seat) so 
that the settings do not get altered.  It is hoped that some of this 
interference will be somewhat reduced by virtue of the properly tuned duplexer.
I will keep you posted


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  • » [mdmars_members] cascade repeater inverted speach recording and thoughts - J Sears