Carl,
What service do you have that involves two microwave hops to get to your
ISP?
73,
Gordon Beattie, W2TTT
201.314.6964
W2ttt@att.net
W2ttt@arrl.net
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of jeremy-ca
Sent: Friday, July 20, 2007 12:16 AM
To: Roger (K8RI); towertalk@contesting.com
Subject: Re: [TowerTalk] help with interference problems
My thruput via 2 microwave hops to my ISP's T3 Verizon fiber is 4.33 Mbps at
the moment. That translates to 4431.3 kbps. T1 is 1500 kbps.
Id say Im flying quite well even with 250' of wet Cat5e which is taped right
to the hardline bundle for the last 15' where it comes down off the
messenger cable (1/4" EHS) and into the basement conduit..
Sure beats cable or DSL.
Carl
KM1H
----- Original Message -----
From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
To: <towertalk@contesting.com>
Sent: Thursday, July 19, 2007 7:32 PM
Subject: Re: [TowerTalk] help with interference problems
>
>
>
>>
>> At 09:48 PM 7/17/2007, Roger (K8RI) wrote:
>>
>>> > My Internet link is a 5.6GHz radio at the 100' level on the tower with
>> an
>>> > 11
>>> > mile shot to the ISP. I come down the tower with shielded CAT5 to the
>>> > router
>>> > in a trailer at the base of the tower; this is run with about 8 turns
>> thru
>>> > a
>>> > FT240-43 toroid . Then a 250' run of regular CAT5 to the house and a 8
>>> > port
>>>
>>>Lordy...I'm running a gigabit network through 130' of CAT5e parallel to
>>>and
>>>within about 5 to 10 feet of all the coax runs to the tower. (75 to 90
>> feet)
>>>It then runs under the 75 half wave sloper to the shop. I found that even
>>>a
>>>metal staple used to loosely hold the cable created enough inductance to
>>>screw up the network. It won't work in metal conduit either.
>>
>> I would be surprised if you ever get this running right at 1Gb speeds.
>
> It's running close with 105 to 115 MBs being typical between any two
> computers. Running a KW on SSB doesn't seem to show up as affecting the
> speed on the network monitor.
>
>> Gigabit speeds on Ethernet are really fussy and very susceptible to
>> interference. The only thing you have going for you is that it is
>> shielded
>> cable, which does help.
>
> It's not. I'm using CAT5e which is really fussy to run.
>
>> - Don't make sharp bends in the cable.
>
> I use sweep Ls for all corners. Like one staple, I found one kink caused
> problems.
>
>> - Don't run the cable next to other cables.
>
> The CAT5e runs all by itself, but parallel to and about 5 to 10 feet from
> the cables going to the tower.
> That is except for each end which ends up in a rats nest of cables but
> only
> for about 5 feet.
>
>> - Don't crush the cable with tie wraps etc.
>
> AMEN!
>
>> - GB Network cards that are on the MB are notoriously poor in
>> performance.
>
> I have two that are using the native NICs on the MB. One is an ASUS M2N
> SLI
> Deluxe and the other is a Gigabyte of which I have forgotten the model
> but
> it uses the 590 chipset. These seem to run as well as the others using PCI
> NICs, but the ASUS is only about 3 months old and the other is around 2
> IIRC. At any rate they are late models. The first is running an Athlon 64
> FX62 and the other is an Athlon 64 X2 6000.
>
>> A 'good' aftermarket card usually works better.
>> - Again, very susceptible to interference.
>> - This appears not to be a problem, but If your runs are more that 100
>
> I'm only running a 130 feet.
>
>> meters, then since the velocity factor of the twisted pair sets in the
>> cable
>> are different, (to eliminate crossover issues) the signals arriving at
>> the
>> far end are too far enough out of sync.
>>
>> If you are still unsuccessful, look into using single mode fiber if you
>> can.
>>
> It's working great and I'm afraid to touch anything. <:-))
>
> 73
>
> Roger (K8RI)
>
>> James Wolf, KR9U
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
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> TowerTalk@contesting.com
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