Forgot about that trick. In the early days of canopy I solved a few TV
interference issues with that method.
From: Kurt Fankhauser
Sent: Thursday, June 08, 2017 6:48 AM
To: af@afmug.com
Subject: Re: [AFMUG] Interference on a repeater at 149 MHz
Try switching all the ports to 10-BaseT and see fi noise goes away.
On Thu, Jun 8, 2017 at 1:25 AM, George Skorup <george.sko...@cbcast.com> wrote:
That's all fine and good, but I pointed out that the contractor tied their
heliax to our conduit all the way up. That was about the dumbest possible thing
they could've done. There's cable hanger bars that are about 3 feet wide and
we're all the way to one side with our conduit. That's just fucking lazy.
On 6/7/2017 11:31 PM, Brian Webster wrote:
The problem with this attitude to the fix, you as the WISP are now an
unintentional radiator interfering with a licensed service. This will get you a
visit from the FCC and you will be at fault no matter what. Because you have
equipment that is unintentionally radiating in licensed spectrum, based on all
FCC rules you lose and you get fined. This would be the case even if you had no
RF equipment on the site. That is why gear has certifications for emissions for
class a and b computing devices to assure they do not radiate any unintentional
RF signals. Once you install any equipment like that outside the parameters the
gear was certified under, you become liable for the fines.
As mentioned by others fix the problem, if they call the FCC you will be
screwed plain and simple.
The school is not SOL because of your gear, you are. You are an unlicensed
system radiating on their frequencies…… it is your responsibility to eliminate
that interference as soon as you are notified and it is shown to be your
equipment causing the problem.
Thank You,
Brian Webster
www.wirelessmapping.com
www.Broadband-Mapping.com
From: Af [mailto:af-boun...@afmug.com] On Behalf Of George Skorup
Sent: Wednesday, June 07, 2017 7:56 PM
To: af@afmug.com
Subject: Re: [AFMUG] Interference on a repeater at 149 MHz
We have a local school district co-located with us on a water tower and
they're complaining about noise on their input. I pretty much told them they're
SOL until we need to add or replace cables since they're all in an 1-1/4" PVC.
So we'll have to run temp cables up, rip all the cables out of the pipe and
pull new ones. The village said we have to be in conduit. And we do have a
couple cables in use that aren't shielded. They didn't offer to pay for it, so
too bad.
They're running a Kenwood repeater in an outdoor cabinet. Maybe 12U.
Obviously that's not going to fit the proper large can cavity duplexer like a
Sinclair. Plus they have >4.5MHz split, so no doubt that let them use a smaller
rack-mounted duplexer.
So I'd be curious to know what the setup is on this 149MHz repeater. Are
they using a small crappy duplexer with a large split, too?
On 6/7/2017 5:55 PM, Lewis Bergman wrote:
I don't think so. I am assuming they probably didn't install some
connectors correctly. Unless they are using some extremely crappy gear the RF
portions of all half decent repeaters are shielded very well. Unless they
modified the repeater leaving some shielding off the connectors are the most
likely source. I guess there could also be punctures or some such in the coax
as well.
On Wed, Jun 7, 2017 at 5:51 PM Jaime Solorza <losguyswirel...@gmail.com>
wrote:
Lewis. You are assuming the VHF gear was properly installed...few
folks do right first time... someones laziness or lack of knowledge is
another's opportunity to make some cash
On Jun 7, 2017 4:41 PM, "Lewis Bergman" <lewis.berg...@gmail.com> wrote:
Has anyone checked their connectors/connections between all RF points?
Antenna to cable, cable to duplexer, duplexer TX/RX to repeater.
Most of the time I have seen Two Way equipment either be interfered
with or interfere with someone else it is a connector issue. The only other
case I have seen issues should be able to be determined by an intermod study. I
doubt it has anything to do with intermod. My bet is a faulty connector. I
would assume it is the RX side so I would check the RX Repeater port to the RX
port on the duplexer and then the rest of the connectors.
Not saying it can't be the the CAT5, just that if all is good on the
antenna system I haven't ever seen an issue and I have a lot of sites with both
two way and 900, 2.4, and 5GHz operating on all kinds of speeds both POE and
not.
