No. Bigger.
On 7/23/2015 11:20 AM, Josh Luthman wrote:
Like this?
http://www.newark.com/fair-rite/0475178281/frequency-min-200khz/dp/82X7129
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Thu, Jul 23, 2015 at 11:14 AM, Adam Moffett <dmmoff...@gmail.com
<mailto:dmmoff...@gmail.com>> wrote:
Yeah I know a site that had nothing but problems at a 35kw FM
station. Fiber and DC to a CMM4 at the top finally made it all
work. Short, shielded jumpers from the CMM to the AP's. They
still had occasionally spats of CRC errors, but not bad enough to
affect service.
Never had any luck with ferrites until I got big ones. At
fair-rite.com <http://fair-rite.com> I found one that was I think
300ohms at 100mhz, and it was big enough to loop the cat5 through
it 10 or 11 times. I think the the deal is you square the
impedance for every extra loop you make through the ferrite, so
just sticking a ferrite on the cable doesn't do nearly as much as
looping through it a bunch of times. I have not tried that at the
35kw site, but it did work at a 3kw site.
On 7/23/2015 2:22 AM, Joe Falaschi wrote:
We have 450 APs at 410 feet with a 50k station just above it,
something like 440 to 500 feet or something. We see some minor
CRC errors on the 450 and more so on the FSK and that is with
fiber up the tower. We tried an EPMP at the same elevation
and we couldn't connect an SM to the AP much less even get
into the AP's management page. This seems like it was over a
year ago. We didn't do a whole lot of investigation. We like
EPMP a lot but it didn't work for us on a high power FM site
when the two units were close.
That said we have an EPMP on the same tower at 120 feet that
we are using as a BH to another site and it is working great.
So, your situation may work out ok.
FYI, we have the radio station turn the transmit power down
each time we climb. They don't like to do that during the
morning and evening drive time.
Joe Falaschi
e-vergent
On 7/22/15 6:15 PM, George Skorup wrote:
I have a connectorized ePMP on a 2' dish at 125 feet on a
50kW FM site. The bays start at 420 feet though. And it's
50kW EIRP. Something like 15-16kW actually on the
transmission line. There's also a low power station at 250
feet, but it's under 3kW I think. The 450 AP at 225 feet
sees some CRC errors sometimes. The ePMP radio doesn't
have any problems though. The guys didn't listen to me and
ran our cat5 bundle right next to the high power
transmission line. "But there were waveguide brackets
there, it was so easy!" I smash your face now.
On 7/22/2015 4:00 PM, Josh Luthman wrote:
Has anyone had good luck on FM stations recently? I
would *LOVE* for the radios to have an SFP, but it
seems that's just not available. I'm wonder if fiber
up ~250' and then 10-20 foot shielded cat5 would be
sufficient to protect the ethernet ports from such
high power.
I'm also weary about getting on the tower for having
such high power 250 feet away, but that's a secondary
issue.
Josh Luthman
Office: 937-552-2340 <tel:937-552-2340>
Direct: 937-552-2343 <tel:937-552-2343>
1100 Wayne St
Suite 1337
Troy, OH 45373
