[ARC5] ARR-1

[Michael A. Bittner]

Mike, Thanks for the interesting history on Fessenden's invention.

His principle was used in some LF marine and aeronautical beacons with the carrier and Morse ID sent on two frequencies separated by 1020 Hz.  What it amounts to is a SSB unsupressed carrier system.

I disagree that the YG/ZB system used this exact system.  It was just plain old AM - double sideband, unsuppressed carrier.  UHF carrier AMed by a BCB frequency.

Mike, W6MAB 

 I
  ----- Original Message ----- 
  From: Mike Everette via ARC5 
  To: ARC5 at mailman.qth.net ; kgordon2006 at frontier.com 
  Sent: Wednesday, September 17, 2014 6:58 AM
  Subject: Re: [ARC5] ARR-1


  Getting back to the YE/ZB. This system represents the ONLY direct application, as far as I am aware, of Fessenden's original Heterodyne principle. 

  The thinking was, "UHF" signals would be line-of-sight only, undetectable by an enemy over the horizon (yeah, right) but perfectly readable by aircraft at altitude. Two signals were transmitted simultaneously in the 234-258 mc band, separated by a value from 540-830 kc which would be tunable on a low frequency receiver such as the RU, ARA or ARC-5. All of these could serve as the IF for the ARR-1 (which actually was not a "converter" in the classic sense, but rather more of a "heterodyne detector"). The ARR-2, of course, was a self-contained receiver which had several fixed IF frequencies between 540 and 830 kc.

  73

  Mike
  WA4DLF