95.7 MHz.
I was thinking one dimensionally, that's why I picked something so big.
Since there would be 2 dimensions I obviously don't need anything that
big. I'm using ToughCable and I'm thinking we use 3/8" bits for holes and
that's a really nice size for barely any gap. I think the cable is between
1/4 and 3/8 (call it 5/16"?)
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Thu, Jul 23, 2015 at 12:19 PM, Bill Prince <part15...@gmail.com> wrote:
> Get one that matches the frequency(ies) that you want to block best. What
> frequency is the FM station?
>
> bp
> <part15sbs{at}gmail{dot}com>
>
>
> On 7/23/2015 8:54 AM, Josh Luthman wrote:
>
> Fair rite has options for 1 to 300 Mhz and 25 to 300. Any idea which you
> chose?
>
> This is 101.6 mm which is 4 inches
>
> www.fair-rite.com/cgibin/catalog.pgm?THEONEPART=2643814002&SEARCHAGAIN=N#select:onepart
>
> I figure the cable is 3/8" * 10 loops or 95.25 mm
>
>
> Josh Luthman
> Office: 937-552-2340
> Direct: 937-552-2343
> 1100 Wayne St
> Suite 1337
> Troy, OH 45373
>
> On Thu, Jul 23, 2015 at 11:44 AM, Adam Moffett <dmmoff...@gmail.com>
> wrote:
>
>> I'm not sure if the link matches what you're describing. The link is to
>> a clip-on ferrite for a single cable up to 8.7mm diameter.
>>
>> On 7/23/2015 11:30 AM, Josh Luthman wrote:
>>
>> That's got room for 6" of cable. I figure that's enough for 10 loops?
>>
>>
>> Josh Luthman
>> Office: 937-552-2340
>> Direct: 937-552-2343
>> 1100 Wayne St
>> Suite 1337
>> Troy, OH 45373
>>
>> On Thu, Jul 23, 2015 at 11:21 AM, Adam Moffett < <dmmoff...@gmail.com>
>> dmmoff...@gmail.com> wrote:
>>
>>> 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>
>>> 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 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
>>>>>>> Direct: 937-552-2343
>>>>>>> 1100 Wayne St
>>>>>>> Suite 1337
>>>>>>> Troy, OH 45373
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>>
>>
>>
>
>
