The modem requires 16VAC. So battery pack substitution does not work. I
did substitute 2 other cubes from other units and have substituted the other
units. The manufacturer (Efficient Networks) says they will not help as
their unit passed FCC type B specs. Looking in the garage to see if I can
find a aluminum box to drop this into.
RF levels, 150w. Antennta is at 55' approx 50' from shack. Also remember
that it was not on the telco dsl line when I used an internal modem so my
guess is like yours is that it is the cube pwr supply. Maybe I will have to
build a well shielded, filtered power supply,
Dick
----- Original Message -----
From: <dgsvetan@rockwellcollins.com>
To: <w7zr@citlink.net>; <rfi@contesting.com>
Sent: Monday, September 09, 2002 11:34 AM
Subject: Re: [RFI] RFI and Speed Stream 5667 DSL Modem
>
> Richard,
>
> The problem could still be in the power cord or wall cube. You might try
> to determine what voltage(s) is/are supplied by the wall cube to the
modem.
> I would then rig a battery pack and connect it to the modem with
absolutely
> the shortest cable that you can. Use beads on the cable if possible. If
it
> works, then you know the cube is being hammered and will require
filtering,
> probably on its AC line input side. If this still doesn't do it, then I
> would suggest that it is time to call the manufacturer. Remember, sadly,
> that equipment made to FCC specs has to pass no RF immunity requirement.
>
> You don't mention your RF power level or proximity of antennas to the
> shack. Those could be factors to consider, especially if isolating the
> modem power does not fix the problem.
>
> Good luck.
>
>
>
>
>
>
> "Richard Zalewski" <w7zr@citlink.net>@contesting.com on 09/07/2002
12:32:10
> PM
>
> Sent by: rfi-admin@contesting.com
>
>
> To: "RFI" <rfi@contesting.com>
> cc:
>
> Subject: [RFI] RFI and Speed Stream 5667 DSL Modem
>
>
> Any one out there using a Speed Stream 5667 DSL Modem or similar external
> modem by Efficient Networks? Having a bear of a time keeping RF that
> unsyncs the modem
> out even at low power.
>
> I never had the problem with an internal DSL modem. So I do not think it
> is
> a problem with the telco line.
>
> Here is what I have done so far:
>
> 1. Ferrite beads on all leads to modem. (The correct kind and lots of
> turns)
> 2. Physically moved the modem around
> 3. Covered the modem in aluminum foil
> 4. Removed the Ethernet cable from the modem so it is only the power cube
> and the telco DSL line
> 5. Substituted power cubes
> 6. Inverted the power cube in the AC mains outlet
>
> Any one with more ideas? (Other than junking the modem)
>
> Dick W7ZR
>
>
> Price Reduced!!
> Beach Vacation or Retirement Home
> Visit www.w7zr.com for details
>
>
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>
>
>
>
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