The reports from the RSGB Spectrum Forum meeting held October 29, 2016 have been released. The VHF Spectrum Report highlights the 12 dB increase in Noise Floor.
The report, produced by the RSGB VHF Manager John Regnault G4SWX, notes that Ofcom have increased the noise floor criteria used to calculate coverage areas for Low Band VHF from -104dBm to -92dBm. This recognises the increase in human-generated noise in this part of the spectrum.
The increase in Noise Floor level means you now need 150 watts to achieve the coverage once obtained with a 10 watt transmitter.
Read the VHF Spectrum Report at
http://rsgb.org/main/files/2016/11/5.2_VHF-Managers-report_Oct2016.pdf
Read the AMSAT-UK report at
http://rsgb.org/main/files/2016/11/7.1_AMSAT-UK_SpectrumForum_Oct2016.pdf
Read the other Spectrum Forum reports at
http://rsgb.org/main/blog/spectrum-forum-posts-overview/spectrum-forum-meeting-minutes/2016/11/04/spectrum-forum-meeting-2016/