[MilCom] 11.175 Wierdness (HF)

[sdaitch at mor.ibb.gov]

   It doesn't make any sense that two independent transmitters would both
   jump  in frequency.  Now, if we were a lot of yearws back, in the days
   of  frequency  division  multiplex  systems  (FDM) on the microwave or
   cable  systems, I might consider these two transmitters could fed with
   the  same  audio and somewhere in the common audio path, an FDM system
   was not frequency locked on a path. 

   There  just isn't much FDM gear left with the common carriers, I don't
   think, so that problem would not be the cause.

   73

   Sheldon

   
   ----- Original Message -----

   From: Ted <tandkmoran at comcast.net>

   > Has anyone else noticed the USAF ground network on 11.175 (mostly
   > Offutt & Andrews) seems to be having some frequency stability
   > problems? At first I thought it was my aging R71, but it seems
   > fine on adjacent channels. Their signals seem to jump up and down
   > between 200 Hz and 1 Khz about every 20 seconds when the big
   > transmitters are running. Anyone else hearing it - or, is time for
   > a new radio? Heck, probably time for a new radio anyway - several,
   > in fact! Happy Scanning! - Ted