146 MHz RB-TV
UK radio amateurs with full licenses have been given access to an extension of the 2mts band between 146 and 147 MHz but only for experimental modes. This is done on a temporary basis and you will need to do an on-line application for a NoV to your current license using this link:
The RSGB band plan now includes (and encouraged) the use of Reduced Bandwith Digital ATV (RB-TV) using 500 KHz centered on 146.5 MHz. For more info on Reduced Bandwidth Digital television (RBTV) take a look at this RB-TV special edition of CQ-TV.
RB-TV equipment for 146 MHz
RB-TV on 146 MHz is not possible using "normal" DATV equipment and requires the use of equipment developed specially for the mode. For more technical details take a look at our getting started guide to RB-TV. Getting Started with RB-TV
Due to the very low symbol rate, normal Set top boxes and satellite receivers will not receive RB-TV. The BATC minituner project was developed specifically to receive RB-TV - more details can be found on this wiki page.
Unless you use the new Serit tuner with your minituner, standard satellite tuners will not cover 146 MHz and you will need an upconverter from 146 MHz to L band - you can either home brew the upconverter or use one of the following:
- Roberto Zech Elektronik DG0VE, upconverter, power amplifier, mixer/oscillator module, LNA etc. http://www.dg0ve.de/en/index.htm
You will probably need a filtered pre-amp - this design has proven to work very well on 146 Mhz RB-TV:
- DG8 144 - 147 MHz pre-amp with filtering - http://www.ifwtech.co.uk/g3sek/vhfdx/dg8-preamp-v7.pdf . Note kits were available from G4HUP who suddenly became SK in Feb 2017 - we will update the page when a new source is found.
Sam Jewell G4DDK, 8W amplifier kits, pcb, manual etc. http://www.g4ddk.com/144MHz8WPA.pdf
Anglia Live, suppliers of Mitsubishi power modules http://www.anglia-live.com/products/rf-products/rf-discretes-modules/rf-mosfets/list/perpage/21/page/1
60W power amplifier pcb (available from G4DDK above) http://www.ifwtech.co.uk/g3sek/vhfdx/gm3sek-pa-module-board