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Hi Michael -
I've owned a JW Miller AT2500 for around 15 years and wouldn't get rid =
of it
for anything! Mine is serial# 1152, which is one of the mid-production =
units
as I understand it. This one has been modified to cover 160 meters by =
adding
addition inductance in series with L1 (at the grounded end), plus a 4:1
balun rated at 2KW has been installed internally so I can connect ladder
line to it directly.
I use a 160 meter dipole (or slightly inverted V) at 75' at the center,
maybe 50' at the ends, feed with 450 ohm open wire line, and can tune =
1.8 to
30 Mhz (automatically) with a 1:1 SWR. No TVI at any frequency, either.
About 10 or 12 years ago, we took a lightning hit and there was a good =
bit
of damage to the RF section of the tuner, but none to the control
electronics. I had to replace S11 (the inductor tap selector switch) and =
a
number of capacitors, but they were all readily available components
manufactured by Central, Johnson, etc.
I have been very pleased with the tuner and will use it as long as it =
lasts.
I don't have any information about what happened to JW Miller, or any
specific source for parts, although, many of the components should be
available. Some, like the motors, might be hard to find, should they go =
out.
It was designed and manufactured in the early 80's, so hopefully, it
wouldn't too hard to locate replacements.
Hope this helps.
73, Charlie, K4ZRJ, Woodstock, GA.
----- Original Message -----
From: Michael Melland <badger@vbe.com>
To: <tentec@contesting.com>
Sent: Saturday, December 26, 1998 6:54 PM
Subject: [TenTec] JW Miller AT2500 ?? (non-TT)
>
>Sorry for the non-Ten Tec post but this reflector has been very helpful
>so I was wondering ....Anyone have any experience with the JW Miller
>AT2500 auto tuner. I have a chance to purchase one but have never =
known
>anyone who has had one. Any comments regarding the unit and it's vices
>(if any) would be appreciated.
>--
>Michael Melland, KB9QHU
>Winneconne, Wisconsin, USA
>FISTS #4387, 10-10 #69281, QRP-L #1656
>CW, SSB, and Electronics
>List Administrator: grundig@qth.net
>http://www.vbe.com/~badger
>http://www.qsl.net/kb9qhu
>
>--
>FAQ on WWW: http://www.contesting.com/tentecfaq.htm
>Submissions: tentec@contesting.com
>Administrative requests: tentec-REQUEST@contesting.com
>Problems: owner-tentec@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
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<DIV><FONT face=3DArial>Hi Michael -<BR><BR>I've owned a JW Miller =
AT2500 for=20
around 15 years and wouldn't get rid of it<BR>for anything! Mine is =
serial#=20
1152, which is one of the mid-production units<BR>as I understand it. =
This one=20
has been modified to cover 160 meters by adding<BR>addition inductance =
in series=20
with L1 (at the grounded end), plus a 4:1<BR>balun rated at 2KW has been =
installed internally so I can connect ladder<BR>line to it =
directly.<BR><BR>I=20
use a 160 meter dipole (or slightly inverted V) at 75' at the =
center,<BR>maybe=20
50' at the ends, feed with 450 ohm open wire line, and can tune 1.8 =
to<BR>30 Mhz=20
(automatically) with a 1:1 SWR. No TVI at any frequency, =
either.<BR><BR>About 10=20
or 12 years ago, we took a lightning hit and there was a good bit<BR>of =
damage=20
to the RF section of the tuner, but none to the control<BR>electronics. =
I had to=20
replace S11 (the inductor tap selector switch) and a<BR>number of =
capacitors,=20
but they were all readily available components<BR>manufactured by =
Central,=20
Johnson, etc.<BR><BR>I have been very pleased with the tuner and will =
use it as=20
long as it lasts.<BR>I don't have any information about what happened to =
JW=20
Miller, or any<BR>specific source for parts, although, many of the =
components=20
should be<BR>available. Some, like the motors, might be hard to find, =
should=20
they go out.<BR>It was designed and manufactured in the early 80's, so=20
hopefully, it<BR>wouldn't too hard to locate replacements.<BR><BR>Hope =
this=20
helps.<BR><BR>73, Charlie, K4ZRJ, Woodstock, GA.<BR>----- Original =
Message=20
-----<BR>From: Michael Melland <<A=20
href=3D"mailto:badger@vbe.com";>badger@vbe.com</A>><BR>To: <<A=20
href=3D"mailto:tentec@contesting.com";>tentec@contesting.com</A>><BR>Se=
nt:=20
Saturday, December 26, 1998 6:54 PM<BR>Subject: [TenTec] JW Miller =
AT2500 ??=20
(non-TT)<BR><BR><BR>><BR>>Sorry for the non-Ten Tec post but this=20
reflector has been very helpful<BR>>so I was wondering ....Anyone =
have any=20
experience with the JW Miller<BR>>AT2500 auto tuner. I have a =
chance to=20
purchase one but have never known<BR>>anyone who has had one. =
Any=20
comments regarding the unit and it's vices<BR>>(if any) would be=20
appreciated.<BR>>--<BR>>Michael Melland, KB9QHU<BR>>Winneconne, =
Wisconsin, USA<BR>>FISTS #4387, 10-10 #69281, QRP-L #1656<BR>>CW, =
SSB, and=20
Electronics<BR>>List Administrator: <A=20
href=3D"mailto:grundig@qth.net";>grundig@qth.net</A><BR>><A=20
href=3D"http://www.vbe.com/~badger";>http://www.vbe.com/~badger</A><BR>>=
;<A=20
href=3D"http://www.qsl.net/kb9qhu";>http://www.qsl.net/kb9qhu</A><BR>><=
BR>>--<BR>>FAQ=20
on=20
WWW: &nb=
sp; =20
<A=20
href=3D"http://www.contesting.com/tentecfaq.htm";>http://www.contesting.co=
m/tentecfaq.htm</A><BR>>Submissions: &nbs=
p; =20
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href=3D"mailto:tentec@contesting.com";>tentec@contesting.com</A><BR>>Ad=
ministrative=20
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href=3D"mailto:tentec-REQUEST@contesting.com";>tentec-REQUEST@contesting.c=
om</A><BR>>Problems: &n=
bsp; =20
<A=20
href=3D"mailto:owner-tentec@contesting.com";>owner-tentec@contesting.com</=
A><BR>>Search: &n=
bsp; =20
<A=20
href=3D"http://www.contesting.com/km9p/search.htm";>http://www.contesting.=
com/km9p/search.htm</A><BR>></FONT></DIV></BODY></HTML>
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FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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