Posted by bbin37 on Jan 21, 2005; 5:47pm
URL: https://www.es-forum.com/New-to-Group-tp1537668p1537695.html


--- 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