On 7/30/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Does anybody know how the antenna in the N800 headphones is implemented?
Are they using the ground conductor as the antenna, are they using the two
headphone lines as a dipole antenna, or what?
Using the ground connector wouldn't really work since I believe it's
directly connected to system ground and wouldn't produce a net
difference in field strength. When I last checked the ground
connector acted as a ground plane and one of the headphone wires
served as the actual antenna. It doesn't work that well in practice
(in its stock configuration) simply because there's not enough
exposed/non-twisted-pair portion of the headphone wire pair to receive
a good signal (Only one wire/ground pair acts as the antenna and I
can't remember which right now). Once you expose a few inches of the
heaphone wire from the ground sheath/pair it works very well as long
as you don't go crazy and expose so much antenna that it overloads the
RF frontend
.
There are 2 reasons I ask: first, I'd like to be able to do a calibrated
sensitivity check on the FM receiver, which means I need a proper RF
interface to inject the signal from my sig-gen on. Secondly, I work in
what can best be described as RF hell (as you might deduce by the fact
that I have ready access to a calibrated RF sig-gen), and I'd like to be
able to couple my external antenna drop into the N800.
I wouldn't do that if I were you. Any time you connect something to
you and a external (out-door) antenna you're betting against the
possibility of a lightning strike, static discharge, accidentally
touching something live and becoming the shortest path to ground, or a
host of other unpleasant possibilities. Stick with something cheaper
and purpose-built for listening to the radio on; you could even go for
one with a remote so you don't have to touch it every time you want to
adjust the volume or switch stations.
Larry
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