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From: "Jim Thomson" <Jim.Thomson@telus.com>
To: "rick rosner" <rar@uniserve.com>
Subject: RE: [AMPS] Input circuit
To: <amps@contesting.com>
Date: Fri, 6 Jul 2001 11:59:22 -0600
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##### Rick, pse forward this on to whoever.
**** For a PI-net, use the excellent spreadsheet on G3SEK's
website, or the spreadsheet on Rich Measures (AG6K) website. Both
these fellows post regularly on 'amps' at contesting.com.
**** Use a ckt Q of 3-3.5 (This equates to a individual Q of 2
for the C1 cap. IE: 100ohms/Q-2 =XC of 50 ohms on ALL bands.
C1 cap will have 50 ohms of Xc on all bands
**** If Q is too low, solid state rigs will not like it.
Complete info on AG6K's website.
*** There is no commercial source of a ready made tuned input.
If you are planning to use separate tuned inputs for each band,
most fellows use small torroids for the coil, and ARCO
compression trimmers for the C1 + C2 caps. The input Z of a
4-1000 is aprx 100 ohms. The coils can be tweaked by
compressing or spreading the turns on each torroid. or tuned
slugs can be used.
*** avoid using fixed caps, unless you test with air variables
1st, then measure the value of the variables, and then substitute
fixed silver mica's. On 160, and maybe 80M, most fellows pad
the arco's with silver micas.
**** To test ur tuned inputs put a 100 ohm 1/4w carbon
composition resistor across the output of the pi-net in question,
and put a MFJ-259/B on the input. Simply tweak both caps for
flat swr on mfj. repeat for all other tuned inputs.
**** Another method is to use two broadcast variables and a tapped
coil. I use this method on my 3000A7 tube. It's also been
used on 2 x 4-1000 amps.
**** You can see pix of all this on Larry Molitor's (W7IUV)
homebrew amp pix page.
*** still another method that is used with 4-1000's is just one
cap and one coil in parallel, bottom end to chassis, and top
end facing cathode/exciter. W6RU uses this method often. Pix of
his amps are also on Molitor's website. Everytime some new pix
shows up, it's posted on 'amps'.
Cul......Jim VE7RF (ex-VE7RQ)
-----Original Message-----
From: rick rosner [mailto:rar@uniserve.com]
Sent: Friday, July 06, 2001 10:23
To: jim.thomson@telus.com
Subject: Fw: [AMPS] Input circuit
----- Original Message -----
From: "Peter" <pb0aiu@pi4cc.nl>
To: <amps@contesting.com>
Sent: Friday, July 06, 2001 3:16 AM
Subject: [AMPS] Input circuit
>
> Hello world,
>
> Is there any source for a input circuit for a 4-1000 @ the hf bands? A
> layout of a print circuit with components is also welcome.
>
> Peter
>
> Internet DX-cluster telnet://213.10.48.91
> DX-cluster info http://www.pi4cc.nl/dxcluster
>
>
>
> --
> FAQ on WWW: http://www.contesting.com/FAQ/amps
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
>
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