[Mobile-Portable] Through the glass antenna on double pane windows

[Walter Cang]

Hi Art,

Thanks for the quick response. =20

So the base of the antenna has a capacitor?  Thought it was a straight =
connection. =20

But yes, I think I will give it a shot since its here anyway.  I take it =
my chances will be better to go for a half wave antenna too. =20

73 de VA3WYC

Walter


> -----Original Message-----
> From: Art Clemons [mailto:n8blk@aol.com]
> Sent: July 8, 2003 12:59 PM
> To: Walter Cang; Mobile (E-mail)
> Subject: Re: [Mobile-Portable] Through the glass antenna on=20
> double pane
> windows
>=20
>=20
>  >I have a Larsen through the glass antenna on my car. =20
> However, it was
>  >designed for use with a cell phone.  If I were to replace=20
> the whip with
>  >a 1/4 wave rod for 2 meters, will it work?
>=20
> Most likely not, since most such antennas use a half wave=20
> length rather=20
> than a quarter wave for a variety of reasons, not least of=20
> which is the=20
> matching in most such antennas.  I suspect that a reasonable sized=20
> capacitor for 800 megs or so will be too small for 146 megs. =20
> Still, if=20
> you already have one, nothing beats actually experimenting to=20
> find out=20
> the answer.
>=20
>  >Can I use the same mount on the double pane glass windows typical in
>  >most houses nowadays?  I've heard conflicting comments. =20
> One says no=20
>  >because it works only if its on a single sheet of glass.  Another
>  >insisted that it will work.
>=20
> Through the glass antennas work on capacitive coupling with one plate=20
> being moved to produce a reasonable match on whatever band is being=20
> tuned at the time, so the answer really is the old lawyerly, "it=20
> depends" answer.  If the distance in the between the panes is=20
> conducive=20
> to a match between the two plates, then it will, otherwise it won't.=20
> Also please note that with capacitive coupling, a half wave=20
> works better=20
> and is more likely to produce a reasonable match.
>=20
>=20