[Boatanchors] =The_SSSOBs_Inspire_Me_Again?

[Radio AI2Q]

Another way to "see" signals is to sample he RF spectrum at 255 million samples per second, and decimate the torrent of bits coming off the A/D in a dedicated FPGA, as Flex Radio and a few others offer; Flex in its 6500 and 6700. The resulting spectral display is quite revealing---and accurate. Some rigs are better than others.

Vy 73, AI2Q, Alex

 
  ----- Original Message ----- 
  From: Glen Zook 
  To: Rob Atkinson ; parinc1 at frontier.com 
  Cc: Boat Anchors List ; Radio AI2Q 
  Sent: Tuesday, April 26, 2016 10:37 AM
  Subject: Re: [Boatanchors] =The_SSSOBs_Inspire_Me_Again?


  Unfortunately, many solid-state receivers overload with strong signals and the received signals appear to be considerably wider than they really are.  This is true of SSB signals as well as AM signals.




  The way to see if the received signal is really that wide is to turn off the AGC/AVC, turn off the noise blanker, set the volume control a little bit higher than normal, and then use the r.f. gain as a volume control.  Suddenly, the "dirty" signal cleans up and the interference, wide signal characteristics, etc., disappear!  




  Frankly, well over 95% of perceived interference is generated in one's receiver and not in the "offending" transmitter.  Most tube-type receivers are not easily overloaded and most solid-state receivers are easily overloaded.




  The majority of today's amateur radio operators are NOT familiar with how to use their receivers and, basically, run everything "wide open" which, unfortunately, causes all sorts of problems within the receiver.  Because of this, they complain about the quality of the transmitting station when the problem is actually within their receiver!



  Glen, K9STH 


   Website: http://k9sth.net




------------------------------------------------------------------------------
  From: Rob Atkinson <ranchorobbo at gmail.com>
  To: parinc1 at frontier.com 
  Cc: Boat Anchors List <boatanchors at mailman.qth.net>; Radio AI2Q <ai2q at roadrunner.com>
  Sent: Tuesday, April 26, 2016 4:46 AM
  Subject: Re: [Boatanchors] =The_SSSOBs_Inspire_Me_Again?


  Sorry but I find that hard to believe.  From an audio frequency
  response standpoint, the vintage ham gear would have to be
  dramatically modified to achieve that sort of bandwidth.  You'd have
  to get rid of the stock modulation transformer and use broadcast iron
  and re-work the audio input network, alter the bypass capacitance all
  the way through, and I have never heard of anyone with a common Viking
  1 or 100 watt Collins rig or Heathkit or WRL doing all that.  Most
  don't want to, preferring the stock or close to stock vintage
  experience  with a D104 which has an inherent response curve.  the
  broadcast rigs, solid state rigs and maybe the SDR rigs can be that
  wide if the operator chooses, but there aren't that many of those on
  the air relative to everything else.  Most rigs are old military gear,
  the aforementioned vintage ham gear, and homebrew.  If you can get an
  ART13 20 kc wide congratulations, you have worked a miracle, hi.


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