When you say 2way, I think VHF, in which case maybe it’s the Ethernet causing
problems. We used to have this all the time with OTA TV low band VHF before
the digital transition. Have you tried forcing the Ethernet to 10BaseT? Not
losing anything with 900 FSK because it can’t do 10 Mbps anyway.
Sometimes POE switching power supply noise can be a problem as well.
BTW, running coax up the tower is easier at 900 MHz than higher frequencies
because of the lower loss per foot of cable.
Looping the Cat5 several times through a ferrite bead could help as well, but
the fix we always used was 10BaseT. Or at least if that make a big difference,
you know the cause is the Ethernet not the radio.
From: Adam Moffett
Sent: Thursday, July 23, 2015 4:48 PM
To: af@afmug.com
Subject: Re: [AFMUG] 900 fsk and interference with repeaters
Yeah.....I was wondering if it's 450mhz or thereabouts
On 7/23/2015 5:41 PM, Work wrote:
Is the two way system on a really low band that would be a harmonic of the
frequency that you're on right now?
—
Sent from Mailbox
On Thu, Jul 23, 2015 at 5:15 PM, Craig House <cr...@totalhighspeed.net> wrote:
We have another tower that we have installed 900 FSK equipment on that
seems to be causing problems with a 2 way repeater system. The noise floor on
the 2 way system is 20 db higher when the equipment is on. The down side to
this is the tower owner is the repeater owner and without his repeater his
business suffers and the need for the tower is gone. We have in the past had
this issue and ran coax all the way up the tower to have only the antennas on
top and it solved this issue but I dont want to do this for a FSK 900 radio? So
my question would be, what are the odds that the new 450 900 mhz that is only
moments away from being released would work without running Coax up the tower?
I think this is an issue with the processor in the FSK board not the RF @
900mhz that is causing the problem. What have others done about this. We have
another tower that seems to be on the brink of this same issue as well and I
dont want to completely pull off all 900 FSK but maybe I should? Should I just
go to UBNT 900 until the 450's release?
