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[Amps] re: Arcos & Unknown 2m 2x4cx250b designs

To: <amps@contesting.com>
Subject: [Amps] re: Arcos & Unknown 2m 2x4cx250b designs
From: nospam4me at juno.com (skipp isaham)
Date: Fri Mar 7 00:08:25 2003
re: Arcos "strip line" amplifiers for vhf/uhf applications.
-
Hello Einar & Ken, 
-
I have three of the popular Arcos Strip line amplifier 
construction articles available on the sonic server. 
You can pick up the article, but the description pages 
for each amplifier have some really nice pictures 
of actual Arcos units built by the mag/article author 
("Fred"). 
- 
You might compare the description page pics with 
what you have, or just gaze at your pleasure. 
-
http://sonic.ucdavis.edu   Amateur Radio Page
- 
cheers
skipp
--------- Forwarded message ----------
From: kenw2dtc <kenw2dtc@comcast.net>
<sm3mxr@swipnet.se>, amps@contesting.com
-
Einar,
You description sounds like a homebrew amp scaled 
down from the popular two 4CX250 K2RIW 432 mHz 
amp from around 1972.  The 144 mHz amp was made 
of two standard aluminum boxes fastened together 
with the openings at the top and bottom for chassis 
lids.  The grid was also a strip line that was skinny 
and in some cases it was longer than the chassis 
and folded back upon itself.  The stripline and tuning 
flapper caps were described but there were no photos.

Could this be your amp?

73,
  Ken W2DTC

  ----- Original Message ----- 
  From: Einar Persson 
  To: amps@contesting.com 
  Sent: Thursday, March 06, 2003 3:05 AM
  Subject: [Amps] Unknown 2m 2x4cx250b design?


  Hi all
  I have a half built 2m  2x4cx250 project on the bench.
  It is a strip line type, like the ARCOS 2x4cx250 amplifier I've been
  using
  for many years, with some differences.
  It is built many years ago (>20?) by a local ham, but he 
remember almost  nothing about it.
  Most of it is built with fiber glass circuit board 
and the main  differences from
  the ARCOS are:
  1. This one uses receiving type sockets with a 
home-brew screen  capacitor
      made from fiber glass circuit board. (Contact 
springs around the  tube screen ring)
  2. The strip line isn't as wide (100 mm) as in 
the ARCOS so the tubes  sits closer together.
      Strip line length is 250 mm.
  3. The chimney is like a box around both tubes, 
made of glass fiber  circuit board
      with most of the copper taken away.
  4. Air is blown into the cathode compartment
  Is there anyone on this list who knows if this 
is a known/published  design?
  Einar, SM3MXR 

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