Topband: 2Wire, Inc. 3800HGV-B Gateway. RFI --Problem fixed for now..

Jeff Blaine jeff at
Sat Feb 4 10:16:49 PST 2012

The fundamental problem with this 2wire box (and the uVerse system and 
similar types) is that it uses the entire low HF spectrum for transmission.

The system is - by design - a receiver across the 160, 80 and 40m ham bands.


-----Original Message----- 
From: ZR
Sent: Saturday, February 04, 2012 10:13 AM
To: Frank Davis ; topband at
Subject: Re: Topband:2Wire, Inc. 3800HGV-B Gateway. RFI --Problem fixed for 

Im running 250' of shielded CAT5 from house to equipment trailer where the
router resides and then another 120' up the tower to the 5.8GHz link.

Its bundled with the hardline feedlines, rotor and relay control cables and
there has never been a RFI problem there or with the earlier 2.4GHz link.and
there are no ferrites involved. There are also several UHF repeaters on the
tower as well as 160, 80, 40, and 6M all at 1200W.

Maybe Ive just been lucky.


----- Original Message ----- 
From: "Frank Davis" <fdavis at>
To: <topband at>
Sent: Saturday, February 04, 2012 10:57 AM
Subject: Re: Topband: 2Wire, Inc. 3800HGV-B Gateway. RFI --Problem fixed for

> In reply to Jim:
> The CAT5 cable used with the 3800 modem is the one that came in the box
> with it.  The cable is very small diameter and very flexible...the modular
> plugs on it are smaller then the other plugs I have here on what i call
> regular CAT5 cable. The regular CAT5 modular plugs will not plug unto the
> jack on the modem.
> When that small flexible cable was wound on  the two stacked toroids that
> I used It was twisted in a couple of  places so maybe that contributed to
> the FEC events being seen by the telco test equipment.  The cable appears
> to be very cheap and a minimal attempt by the manufacturer to provide a
> cable for general use ...certainly not robust.
> The toroids are not on this line now and all seems to be working fine.
> The iMAc download speed testing within the BellAliant network is 6.6 mbps.
> The full capacity of the line is supporting 4 IPTV set-top boxes two of
> which are HD.
> Fibre Op coming within a few months to my area!
> Frank VO1HP
>> The BellAliant technician told me that placing the ferrites on the CAT5
>> feeding the modem caused  a significant number ( hundreds of '000's on a
>> continual basis.) of FEC (forward error correction) events to begin
>> happening
>> on my line.
> That does not make sense unless the CAT5 was mechanically distorted by
> the winding.  That would disturb the impedance at bit, but a LOT of
> errors doesn't make sense to me. The ferrites form a common mode choke,
> which the differential circuit should not see.
> _______________________________________________
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