Bill=2C Jim=2C
Out of interest what kind of length did you both end up with??
Dave
Date: Sun=2C 28 Mar 2010 13:18:44 +0000
From: jimpuglise@comcast.net
Subject: Re: Europa-List: Re: Antenna tuning
David-
I think you have been trimming your copper tape in millimeters. I did a co
uple of calculations this morning and you change resonant frequency is abou
t .38 inches (around 10 mm) per mhz. So--if you have been trimming your fo
il at 2 mm per check=2C you would need to trim it 5 times to move it 1 mhz.
If you do your graph=2C you should be able to calculate very closely how
you need to trim it and do it with a single cut.
Jim Puglise A-283
----- Original Message -----
From: "david park" <dpark748@hotmail.co.uk>
Sent: Sunday=2C March 28=2C 2010 7:30:11 AM GMT -05:00 US/Canada Eastern
Subject: RE: Europa-List: Re: Antenna tuning
Bill=2C
Thanks for the offer but I am in South Manchester=2C nr airport!. But I may
ring you when I am next in the garage. Originally with the length at 490mm
as per drawing the best SWR was at 133.00. I shrortened it down to 480mm b
ut could not get best SWR mid frequency range. I have temporarly extended t
he antenna to try again.
Regards Dave
> Subject: Europa-List: Re: Antenna tuning
> From: Billandsue@billbell.co.uk
> Date: Sun=2C 28 Mar 2010 03:21:15 -0700
> To: europa-list@matronics.com
>
l.co.uk>
>
> David=2C
>
> If you are anywhere near me (Aylesbury=2C so must be closer than Ferg!))
I'm happy to turn out and provide some hands-on help if you think that woul
d be useful. I suffer from the delusion that I know a little about antennas
(antennae?) and I have a couple of suitable SWR meters and some practical
experience messing about with this sort of antenna. Please give me a call o
n 01296 689165 if you think that would be any use or you just want some tel
ephone advice.
>
> Regards
>
> Bill
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=292045#292045
>
>
>
>
>
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>
>
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