Sorry guys. I am using Yahoo and they are going thru a downgrade in
their services. They have went from
a working system to something a pre-schooler would dream up.
Here is a link to the web site for the 229/238 tuner mod:
www.n6ic.com/Ten_Tec_238.htm
Hope this works, if not simply Google TenTec 229 mod and you should see
it.
Clayton N4EV
On Saturday, October 12, 2013 1:06 PM, Rick - DJ0IP / NJ0IP
<Rick@DJ0IP.de> wrote:
THAT'S THE PROBLEM, MIKE! (the Chinese have smaller feet than we do)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Mike
Bryce
Sent: Saturday, October 12, 2013 5:59 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Antenna is up, but the coupler doesn't like 160
meters
bob and the gang,
inserted the 259 and with the 1:1 balun.
resonate freq is 2.487 or there abouts
so the antenna as it sits is too short.
I'll re-check the length with my harbor freight made in china 300 foot
tape
and see what each leg is (length wise)
Mike Bryce, WB8VGE
the heathkit shop
SunLight energy systems
J e e p
o|||||||o
On Oct 12, 2013, at 10:42 AM, Bob McGraw - K4TAX wrote:
The extra / external cap is used across the capacitor bank, starting at
position #4 and #5. Both on the Low and High Z sides. I find the text
is
incorrect, the schematic is correct. Yes a .01 is way too much C by a
factor of 10x.
If you have a means to do so, what is the natural resonant frequency of
the antenna? I use my MFJ-259 as a grid dip meter effect to find the
resonant frequency. I'm not speaking of some frequency where the SWR is
1:1
or such.
I take a different approach to antennas. I first start with a resonant
antenna at the desired frequency, then adjust the height of the antenna
to
attain the desired feed point impedance. I saw Jim Brown, K9YC mentioned
this in his earlier post as he used different coax impedance lines
dependant
on the height of the antenna. I am not one to "prune" the length of the
antenna for some SWR value. Now in cases I know we can't get the antenna
at
different heights specially as we get to 160M and to some extent 80M. In
these cases, the typical height above ground does bring the center Z to
20
to 30 ohms. Nothing wrong with this. With low loss coax or a balanced
feed, just let the tuner deal with it. That's what it is supposed to do.
I
find having a resonant wire is more effective and easier to effect a good
match.
73
Bob, K4TAX
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