Frequency band (MHz) Minimum path length (km) Below 1,850 ....................................................... N/A
1,850 to 7,125 ................................................... 17 10,550 to 13,250 ............................................... 5 Above 17,700 .................................................... N/A Also using the formula below you can come up with using the gear on much shorter distances you just have to turn the TX power down. Daniel White Managing Director Hardware Distribution Sales ConVergence Technologies Cell: +1 (303) 746-3590 <mailto:[email protected]> [email protected] From: Af [mailto:[email protected]] On Behalf Of Ken Hohhof Sent: Tuesday, November 8, 2016 8:05 AM To: [email protected] Subject: Re: [AFMUG] Class A and B antennas Hmmmm, can you clarify on minimum distance? I was not aware of a min distance on 11 GHz, but if its only 5 km, maybe that was just never an issue. But I thought min distance at 6 GHz was more like 10 miles. Did I miss a change? From: Af [mailto:[email protected]] On Behalf Of Daniel White Sent: Tuesday, November 8, 2016 6:29 AM To: [email protected] <mailto:[email protected]> Subject: Re: [AFMUG] Class A and B antennas Mostly answered but Ill take a stab: Class A vs Class B is about side-lobe suppression and F/B ratio. ETSI classes are the same way and Class 4 antennas as Eric pointed out are a rare beast - For 11GHz, the smallest Class A antenna is the VHLP800 (2.6ft). Most 3ft antennas are actually a little bit bigger than 3ft (99cm) - For 18GHz, the smallest Class A antennas I am aware of are 2ft - Minimum distance for 11GHz and 6GHz is covered under FCC Part § 101.143, with the minimum distance being 5km (roughly 3.12mi). If you want to go shorter, than the max coordinated power you can use is calculated like this: EIRP = MAXEIRP40*log(A/B) dBW EIRP = The new maximum EIRP (equivalent isotropically radiated power) in dBW. MAXEIRP = Maximum EIRP as set forth in the Table in Section 101.113(a). *This is +55dBW for 11GHz* A = Minimum path length from the Table above for the frequency band in kilometers. *This is 5km for 11GHz* B = The actual path length in kilometers. NOTE: For transmitters using Automatic Transmitter Power Control, EIRP corresponds to the maximum transmitter power available, not the coordinated transmit power or the nominal transmit power. Daniel White Managing Director Hardware Distribution Sales ConVergence Technologies Cell: +1 (303) 746-3590 <mailto:[email protected]> [email protected] From: Af [mailto:[email protected]] On Behalf Of SmarterBroadband Sent: Monday, November 7, 2016 6:34 PM To: [email protected] <mailto:[email protected]> Subject: [AFMUG] Class A and B antennas Does anyone make a 2 foot Class A antenna for 11 GHz? Or is 3 foot the minimum. Does anyone make a 1 foot Class A antenna for 18 GHz? Or is 2 foot the minimum. Is there a minimum distance for a 11 GHz link? Thanks Adam <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai gn=sig-email&utm_content=emailclient&utm_term=icon> Virus-free. <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai gn=sig-email&utm_content=emailclient&utm_term=link> www.avast.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
