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Alex J Lennon ajlennon at dynamicdevices.co.ukThanks for your feedback on this Paul. I have had some more feedback from another chap who was also very helpful. I'll post it on this thread to assist anybody searching for this type of information in future. I will certainly let you know how the application proceeds. ... Yes you need to state 1800Mhz (class of emission) The BTS is a single-TRX BTS designed for indoor use (–5C to +45°C). Maximum transmit power is +23dBm for the 1800 MHz BTS Channel Spacing is 200Khz Power output control is 12 steps Power consumption is 13watts Standards are ETSI EN301489-9 Using the tool at http://www.compeng.com.au/emc_conversion_tables_power_calculator.aspx you should be able to work out what you require knowing the max output is +23db As a rough guide (as I'm NO radio expert) the formula is like so: EiRP (dBi)=ERP (dB)+2.1 ERP(dB)=Ant Gain (dBd)+POWERBTS (dBm)-Combiner loss-Cable loss-Fading margin So.... Output power = 23db Unit lose = 6.5db per 100m Gain of anntena = 10db Combiner lose = 3db Fading Margin = 2db Radiated power of attenna (ERP) = 21.5db (23 - 6.5 + 10 - 3 - 2) Max radiated power (EiRP) = 21.5 + 2.1 = 23.6dbi On 26/10/2011 13:51, Paul Dart wrote: > Hi, > > On 26 October 2011 11:16, Alex J Lennon<ajlennon at dynamicdevices.co.uk> wrote: >> Hi, >> >> I'm working through a UK Ofcom Non-operational license application form >> to obtain a license to test with an ip.access nano-BTS 1800. >> >> I'm having a little trouble determining a few of the characteristics of the >> nano-BTS and I wonder if anybody could offer me any advice? >> >> - Presumably I can provide GSM 1800 as the frequency of operation (or do I >> need to be more specific?). > For the purposes of Ofcom this should be fine. They will then give you > a set channel/freq. in that band to use and this will be specific. > >> - What would be the "class of emission designation" for UK GSM ? >> >> - Given I'm just going to use a nano-BTS with a couple of Wifi 10dBi SMA >> antennae is there somewhere > Wifi antennas are usually tuned for 2.4GHz and 5.8GHz (maybe 900MHz if > you get it from the US or something). You are probably better getting > an antenna that will work properly in the band you are using (unless > it's a wideband antenna). > >> I can find figures for: >> >> - peak RF Power supplied to the antenna or load? >> - peak radiated power (ERP or EIRP) >> - mean radiated power (ERP or EIRP) > You need to know: > a) the power output of the nanoBTS you have (ask the > manufacturer/check the datasheet) > b) any cable losses between that and the antenna > c) the gain of the antenna (I presume 10dB is at 2.4GHz for wifi. It > will likely be less for 1800MHz, see my comments above). > > Add these together and you will get the power out. a) and b) gives you > the answer to the first one. > ERP and EIRP are subtly different. Check wikipedia/ask Ofcom if you > need some help. > >> Many thanks, >> >> Alex >> > Hope this helps, and good luck. Let me know if you do get an approved > application as I would be interested in doing the same in the UK. > > Regards, > > Paul >