>--- In [hidden email], "Cara" <cara_evangelista@h...> wrote:
> > FYI, even my husband's telephone headset seems to trigger ES
> > symptoms if used for an extended time. An old-fashioned corded
> > phone, as low-tech as possible, seems preferable.
>
>I use a Plantronics 'Vista' M12 headset amplifier powered only by the
>optional battery mode. 2 AA batteries is all the headset needs and
>they last for months. The field associated with the Vista amp unit
>drops beneath the threshold of my TriField meter to measure at a range
>of 3 inches at maximum volume. The earpiece speaker AC field stays
>beneath a 60Hz effective strength of 0.6 mG with the meter in direct
>contact at its most sensitive location, dropping to unmeasurable at
>just over an inch, at a volume which is quite audible for me.
>
>This setup has allowed me extended phone conversations with much less
>discomfort. :)
>
>I've placed a photo of this setup, "Plantronics Vista M12 setup" in
>our Photos section, Low EM Phone Configuration album.
>
>I invested in this after standard landline phone receivers began to
>trigger my ES. The portion next to the ear usually has a strong DC
>magnet as part of the speaker assembly. (In contrast, the Vista's
>earpiece speaker's DC magnet is approximately 7x less strong than my
>standard phone's speaker.) And once it is driven by the AC phone
>signal, it creates an AC field which is too strong for me to hold at
>my ear.
>
>You can also look at the Vista unit's specs here:
>http://tinyurl.com/3mce6
>
> > For ES purposes, my rule of thumb is that wired is better than
> > wireless.
>
>Thumbs up to that! The wired phone frequencies are typically much
>lower and the fields are confined near the wire.
>
>Beau
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>Yahoo! Groups Links
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