X-Received: by 2002:a1c:7c16:: with SMTP id x22mr3884095wmc.113.1571234054098; Wed, 16 Oct 2019 06:54:14 -0700 (PDT) MIME-Version: 1.0 Path: ...!s74no5932082wme.0!news-out.google.com!a6ni7208wma.0!nntp.google.com!goblin1!goblin.stu.neva.ru!eternal-september.org!feeder.eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail From: Dan Purgert Newsgroups: alt.os.linux,comp.sys.mac.system,microsoft.public.windowsxp.general,alt.comp.os.windows-10 Subject: Re: Curious how far your Wi-Fi access point is from your desktop computer Date: Wed, 16 Oct 2019 13:54:13 -0000 (UTC) Organization: A noiseless patient Spider Lines: 95 Message-ID: References: Injection-Date: Wed, 16 Oct 2019 13:54:13 -0000 (UTC) Injection-Info: reader02.eternal-september.org; posting-host="3f2041ce413c8f25aa0cc2ef9183d04a"; logging-data="29430"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX183loxrc9lIfWhoBkCnsSTKao4hD36JONY=" User-Agent: slrn/1.0.3 (Linux) Cancel-Lock: sha1:BbiVbAdi2va9fMlW6u4gc6JmkFg= Bytes: 5443 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Arlen _G_ Holder wrote: > On Wed, 16 Oct 2019 03:06:46 -0000 (UTC), Dan Purgert wrote: > >> Usually around 30. But that's because that's the legal limit for point >> to multipoint intentional radiators. You can only run your setup at the >> EIRP you've stated if it's point-to-point. > > Hi Dan Purgert, > > Thanks for reminding us the rules are different for... > o Point-to-MultiPoint [e.g., 2.4GHz is 36dBm (4watts)] > o Point-to-Point [e.g., 2.4GHz could be as high as 158 dB] No it can't. As per FCC 15.247("Operation within the bands 909-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz"), (b) The maximum peak conducted output power of the intentional radiator shall not exceed the following: (1)For frequency hopping systems operating in the 2400-2483.5 MHz band [...]: 1 watt. (c) Operation with directional antenna gains greater that 6 dBi (1) Fixed point to point operation: (i) Systems operating in the 2400-2483.5 MHz band that are used exclusively for fixed, point-to-point operations may employ transmitting antennas with directional gain greater than 6 dBi provided the maximum conducted output power of the intentional radiator is reduced by 1 dB for every 3 dB that the directional gain of the antenna exceeds 6 dBi. That is, if you have a fixed point-to-point link (such as from a WISP tower to a customer's premises), you can increase the antenna gain by 3 dB for every dB you reduce your conducted power. Assuming we start from the legal limit (30 dBm conducted + 6 dBi antenna), and ignoring any additional restrictions imposed elsewhere in section 15 of the FCC rules (e.g. 15.209): - our first step is a 9 dBi antenna, with 29 dBm conducted, for a result of 38 dBm EIRP. - our tenth step is a 36 dBi antenna, with 20 dBm conducted, for a result of 56 dBm EIRP. - our twentieth step is a 66 dBi antenna, with 10 dBm conducted, for a result of 76 dBm EIRP. - our thirtieth step is a 96 dBi antenna, with 0 dBm conducted, for a result of 96 dBm EIRP. At this point, we've generally nowhere else to go. Some radios may be able to conduct at a few dBm below zero > [...] > So it's not just a single number. > o But it's my understanding that the radio won't "let" you exceed limits > (That understanding is literally from conversing with Ubiquiti support.) The "lockouts" are based on what you give the radio as inputs. Wrong inputs = wrong lockouts. This is, of course, not possible to change on the all-in-one units (Nanobeam, Nanostation), but any of the models with removable radomes (Powerbeam, Litebeam) or antennas (Rocket) can be told the wrong information. > [...] > There they discuss my radio, which turns out to be, for Paul an... > o Ubiquiti PowerBeam M2 400, which is only 26 decibels of transmit > o into an 18dBi antenna, which is legal for point-to-multipoint No, it is not. The maximum EIRP of a point-to-multipoint intentional radiator is 36 dBm (30 dBm conducted power + 6 dBi antenna; or a 1:1 correction thereto). -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEBcqaUD8uEzVNxUrujhHd8xJ5ooEFAl2nIQEACgkQjhHd8xJ5 ooE5iQgAmOfmopm+MN7Cy723cDSf0g/qWwlXFTpXIlUpcHdeExkc22tMrBquD73o XIvua0+DLTurlgMJvgJqhpqvv4+O6fznKfBPm61ew7oNOfRd0X92P5WSEqmMwv8/ GoJ8bLx+Jc+9pHFK0VKF4OgRyagP1VmXSBBK9K/tiyCpgAeUuvl6UU4BXE2SVMOU GXgBpJc9oZcbrh65RNBXYDXyeK72GWb9mTVnGlN1III3YAP3tpj7qIqA+gLkPz3q fKU65F0jXraMvyLgMLmeDoB4Psrc3lZjyBvOAsHwYxHBtlXotaxk6IOIxo2Z6CBh Zk2Nc8Uk9QNSPDncI3Jp2aogOhzLOQ== =PDsL -----END PGP SIGNATURE----- -- |_|O|_| |_|_|O| Github: https://github.com/dpurgert |O|O|O| PGP: 05CA 9A50 3F2E 1335 4DC5 4AEE 8E11 DDF3 1279 A281