Re: NEC-LIST: Hi Q inductors and PVC

Eric,

Let us quantify the dielectric losses. If you can send me the coil
parameters I will calculate the dielectric losses. Thanks.

   Dave Cuthbert
   Micron Technology

-----Original Message-----
From: nec-list-bounces+drcuthbert=micron.com_at_robomod.net
[mailto:nec-list-bounces+drcuthbert=micron.com_at_robomod.net] On Behalf Of
EVonvaltie_at_aol.com
Sent: Saturday, February 19, 2005 11:28 PM
To: nec-list_at_robomod.net
Subject: Re: NEC-LIST: Hi Q inductors and PVC

Waldemar:
    If you CAREFULLY read the data in my posting, you will see that your

comments are
irrelevant. First, the wire on the coil is coated with 20-30 mils of
Teflon,
and most of the inter-turn electric field is located within the Teflon.
Even
then, it is a relatively small field which causes very little loss in
anything
other than extremely lossy materials - if there were any!

Second, where the PVC is located there is very little electric field, so
its
loss factor (about .010) is of no concern. There is no electric field
loss
within the PVC, and its magnetic loss factor (imaginary part of mu) are
negligible. That is why it has very little effect on the Q, which would
be another
manifestation of dielectric losses. Do you really think you can build a
coil with
a Q of 200-300 which has significant losses in its own fields?

Eric von Valtier K8LV

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