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Subject: RE: JB FMR 20 - Radio Reception
From: rinty (rinty_at_freeuk.com)
Date: 2004-06-30


Hi Steve and all,

Yes, but it's very much a "try it and see".

Wind a few of the turns of the headphone cable round a stub of pencil
to make a coil. five turns minimum really, but 3 will help a little.
Put the cable immediately below where the cable divides, if it does,
but try it at different points along the cable, to see how the effect
differs.

This will work better if you run the headphones through an extension
cable, as they'll be more cable to make the coil from. The reason it
works is, that although the cable's insulated, there's still a little
inductance from it. You need to make sure that the turns round the
pencil or whatever you use (the fatter the better, but you'll use more
of your cable), are touching each other.

If you've got a spare extension cable, you could make yourself a
permanent aerial, in which case, cover whatever you use to make the
body of the coil with tin foil, then put the cable on, then cover the
whole with insulating tape. Don't buy a good extension cable to make
the aerial, as the insulation is better, and therefore the inductance
is lower.

The archos headphones aren't doing you any favours, as headphones that
divide before the ear pieces will create a dy poll effect thus also
making reception better. The classic dy poll effect is a Y-shape,
which is what you get from a pair of headphones where both ear-pieces
are connected individually.

Hope that helps.

Rob

-----Original Message-----
From: rockbox-bounces_at_cool.haxx.se
[mailto:rockbox-bounces_at_cool.haxx.se]On Behalf Of Steve Waller
Sent: 30 June 2004 16:56
To: rockbox_at_cool.haxx.se
Subject: JB FMR 20 - Radio Reception

The radio reception is pretty poor on my JB. Is there anyway of
improving it
that anyone knows of?
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