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I was/am aware of the mmcx issue and all tests were done with the same
u.fl pigtails on each end. When the radio cards were changed, the same
u.fl pigtails were used. Only the radio cards were changed. They were the older SR5 cards with the mmcx problem. (proven by testing!!) The mmcx port was down 6db from the u.fl port. [EMAIL PROTECTED] wrote: What pigtails and connectors? Mmcx on the SR5 or u.fl? are these new SR5's or older sr'5s?-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Blair Davis Sent: Thursday, February 09, 2006 2:08 PM To: WISPA General List Subject: [WISPA] MikroTik 5.8GHz Radio cards and settings. Hey all: I'm getting some odd results here with a PtP 5.8GHz link using MikroTik that I setup to test with. Let me describe the setup... The link is 7.9 miles with clear LoS and clear Frenel zone. Each end has a 27db grid with a 3ft LMR-400 jumper to the MikroTik radio. Using the link calculator at http://www.zytrax.com/tech/wireless/calc.htm I get a predicted rx of -60.8db at each end with CM9 radio cards (17db output). Using the SR5 cards, (400mW), I get a predicted rx of -51.8 On to the real world results.... (all reading taken from the MikroTik's winbox. I am using version 2.9.11 on RouterBoard 230's) With the CM9 cards, I get a measured rx of -62db, well within the margin of error. An interesting note here is that I must set the CM9's output power in the MikroTik at 30db to get these results.. I know that the MikroTik must be doing something odd with this setting, as the CM9 can not put out 30db. Reducing the setting drops the rx strenth by a like amount. This link is stable and will pass 30Mb/sec in UDP and 22Mb/sec in TCP mode With the SR5 cards, I get a measured rx of -66db, well outside the margin of error and 15db below the expected rx strength! An interesting note here is that I must set the SR5's output power in the MikroTik at 30db to get these results. I know that the MikroTik must be doing something odd with this setting, as the SR5 should not put out 30db. Reducing the setting drops the rx strength by a like amount. This link is stable and will pass 24Mb/sec in UDP and 16Mb/sec in TCP mode. Nothing else is changed when I swap the SR5's for the CM9's or back again. I use the same antennas, cables, boards and pigtails. The antennas and cables are not moved between tests. (except for moving the pigtail from one card to the other). Can anyone tell me what I am doing wrong here? Or do I just have some bad SR5 cards? Or is the tx power setting in the MikroTik flakey? Or is the tx power setting relative db not absolute db? BTW, I will be changing one end to a sector and wish to use the SR5 cards then. Otherwise I'd be happy with the -62 on the CM9's Thanks in advance. -- Blair Davis AOL IM Screen Name -- Theory240 West Michigan Wireless ISP 269-686-8648 A division of: Camp Communication Services, INC -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.3/254 - Release Date: 02/08/2006 -- Blair Davis AOL IM Screen Name -- Theory240 West Michigan Wireless ISP 269-686-8648 A division of: Camp Communication Services, INC |
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