We saw some noise from a similar setup, and it went away after three things were done. 1. The wireless ISP replaced the Unshielded Twisted-Pair they were using for the Ethernet and Power-Over-Ethernet to the units, with Shielded Twisted Pair and properly GROUNDED the shield. (Some ISP's will *correctly* balk at this, since STP is NOT within the Ethernet spec.)
2. The wireless ISP replaced their crappy $20 Chinese switching power supply that was driving everything including their cheap unshielded Ethernet switch in the radio room with a better supply. 3. The wireless ISP GROUNDED their cheap Ethernet switch's case to their cabinet, which was properly grounded to the sites specifications. To be honest, it didn't get rid of ALL the noise, but a ton of it. We still lose a dB or two at that site to their noise, but since they provide OUR IP service, as well as the tower owner's, as the only way to get IP to that site -- it's a little hard to complain. Thank Goodness multiple techs from the WISP were fluent in "RF". A number of them were hams. Getting a data center geek, turned WISP entrepreneur, to understand basic electronics and RF physics... can be problematic, depending on how you approach them, how you explain the problem, etc. And if they're providing a service to your building-mates and/or the ham stuff is on the site as a low-cost rent or a freebie, don't expect any kind of "urgency" on their part to make any changes if their stuff is making them money. The margins in that business are hideously low. -- Nate Duehr, WY0X n...@natetech.com On Mon, 31 Aug 2009 21:30 +0000, "ve1ii" <bhar...@ns.sympatico.ca> wrote: Hi Rodney and others. The CAT5 cables are definitely shielded and I suspect that they are properly terminated. There are 10 CAT5 cables in total and an LMR200 cable. I suspect the LMR200 goes to a GPS unit which is on the tower. Six of the CAT5's go to the six panels and likely the other four are used on dishes on the tower that pick up and relay the signals coming to the tower. The VHF repeater is using a Sinclair 210-C4 on the top of the tower with the panels mounted just below that (approx. 10 feet down) The repeater is multicoupled to the 210-C4. All feedlines for VHF and UHF antennas is hardline. The power supplies for the panels are switching type. The noise is across the VHF band. Thanks for the comments so far. > > Has the Canopy system been installed using shielded cat5/cat6 cable? The EMI certification is only applicable if shielded cables are used (and properly terminated). > > What sort of antenna is your system using? How much vertical/horizontal separation from the Canopy system? Above or below? > > Does the Canopy have one or two cables running to each panel? If one, the power, sync and data is carried on the same cable. If shielded cable has been correctly used, the cable radiation should be minimal (provided good quality cable with 100% shield coverage is used). > > If there are 2 cables, the sync signal crom the Cluster Management Module (CMM) is on a separate cable. If that cable is not shielded, it could be radiating. > > Rodney. > > ============ ========================================================= > Rodney Baker VK5ZTV > rodney.ba...@... > ========================================================= ============ > References 1. http://groups.yahoo.com/group/Repeater-Builder/message/93739;_ylc=X3oDMTM1YzZtamwyBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEbXNnSWQDOTM3OTMEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMjUxNzU0MjQ1BHRwY0lkAzkzNzM5 2. http://groups.yahoo.com/group/Repeater-Builder/post;_ylc=X3oDMTJwZDhqbDIwBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEbXNnSWQDOTM3OTMEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMjUxNzU0MjQ1?act=reply&messageNum=93793 3. http://groups.yahoo.com/group/Repeater-Builder/post;_ylc=X3oDMTJkcGZrcTFsBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDbnRwYwRzdGltZQMxMjUxNzU0MjQ1 4. http://groups.yahoo.com/group/Repeater-Builder/messages;_ylc=X3oDMTJkbTVnb2ZqBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDbXNncwRzdGltZQMxMjUxNzU0MjQ0 5. http://groups.yahoo.com/group/Repeater-Builder/files;_ylc=X3oDMTJldTU5djV0BF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDZmlsZXMEc3RpbWUDMTI1MTc1NDI0NA-- 6. http://groups.yahoo.com/group/Repeater-Builder/photos;_ylc=X3oDMTJkcDJidjk4BF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDcGhvdARzdGltZQMxMjUxNzU0MjQ0 7. http://groups.yahoo.com/group/Repeater-Builder/links;_ylc=X3oDMTJlcXBsbmg0BF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDbGlua3MEc3RpbWUDMTI1MTc1NDI0NA-- 8. http://groups.yahoo.com/group/Repeater-Builder/members;_ylc=X3oDMTJkajZhOWs4BF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDbWJycwRzdGltZQMxMjUxNzU0MjQ0 9. http://groups.yahoo.com/;_ylc=X3oDMTJjcW0ybW9yBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDZ2ZwBHN0aW1lAzEyNTE3NTQyNDU- 10. http://groups.yahoo.com/group/Repeater-Builder/join;_ylc=X3oDMTJlM2txdHNxBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDc3RuZ3MEc3RpbWUDMTI1MTc1NDI0NQ-- 11. mailto:repeater-builder-dig...@yahoogroups.com?subject=email%20delivery:%20Digest 12. mailto:repeater-builder-traditio...@yahoogroups.com?subject=change%20delivery%20format:%20Traditional 13. http://groups.yahoo.com/group/Repeater-Builder;_ylc=X3oDMTJjc2Rma281BF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDaHBmBHN0aW1lAzEyNTE3NTQyNDU- 14. http://docs.yahoo.com/info/terms/ 15. mailto:repeater-builder-unsubscr...@yahoogroups.com?subject= 16. http://groups.yahoo.com/group/Repeater-Builder/members;_ylc=X3oDMTJlb3N0dmNxBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA3Z0bARzbGsDdm1icnMEc3RpbWUDMTI1MTc1NDI0NA-- 17. http://groups.yahoo.com/group/Repeater-Builder/files;_ylc=X3oDMTJmcjZhaDdhBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA3Z0bARzbGsDdmZpbGVzBHN0aW1lAzEyNTE3NTQyNDQ- 18. http://groups.yahoo.com/group/Repeater-Builder;_ylc=X3oDMTJkdnQ2OWVuBF9TAzk3MzU5NzE0BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA3Z0bARzbGsDdmdocARzdGltZQMxMjUxNzU0MjQ0 19. http://us.lrd.yahoo.com/_ylc=X3oDMTJsbWcxYnF1BF9TAzk3MzU5NzE0BF9wAzEEZ3JwSWQDMTA0MTY4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDbmNtb2QEc2xrA2JyYW5kBHN0aW1lAzEyNTE3NTQyNDQ-;_ylg=1/SIG=11314uv3k/**http%3A//brand.yahoo.com/forgood 20. http://us.lrd.yahoo.com/_ylc=X3oDMTJuOGszYWUzBF9TAzk3MzU5NzE0BF9wAzIEZ3JwSWQDMTA0MTY4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDbmNtb2QEc2xrA3Rvb2xiYXIEc3RpbWUDMTI1MTc1NDI0NA--;_ylg=1/SIG=11c6dvmk9/**http%3A//toolbar.yahoo.com/%3F.cpdl=ygrps 21. http://groups.yahoo.com/start;_ylc=X3oDMTJuMWkwZDh1BF9TAzk3MzU5NzE0BF9wAzMEZ3JwSWQDMTA0MTY4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDbmNtb2QEc2xrA2dyb3VwczIEc3RpbWUDMTI1MTc1NDI0NA--
