We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: 27255 kHz Pager/Data DX 10 January 2015  (Read 1524 times)

Offline R4002

  • Moderator
  • DXing Phenomena
  • *****
  • Posts: 2609
    • View Profile
27255 kHz Pager/Data DX 10 January 2015
« on: January 10, 2016, 2008 UTC »
CB channel 23 - 27.255 - is technically part of both the CB radio service and the R/C radio service.  Per Part 95 of the FCC rules, R/C users are allowed to transmit up to 25w carrier power on 27255....not 25w PEP.  This means, in theory, that a legal pager or R/C transmitter on 27255 could transmit up to 100w PEP power and still be within the FCC power limits, provided the carrier power was 25w or less (carrier power x4 for PEP output).  Ref: FCC Rules 95.210(a) - see https://www.law.cornell.edu/cfr/text/47/95.210. Additionally, modulation methods are not specified, which could explain why the signal I heard seemed to be in FM mode instead of the usual AM.  

During my 11 meter adventures this afternoon I came across a very strong data signal (sounded much better in FM mode) on 27255.  Full scale S9+30 db on my CRE 8900 (Alinco DR-135DX) mobile radio.  I have heard strong data signals on this frequency before but this is the strongest I've heard.  Just another 11 meter frequency to check during band openings :D
« Last Edit: January 10, 2016, 2014 UTC by R4002 »
U.S. East Coast, various HF/VHF/UHF radios/scanners/receivers