Skipp,
Thanks for the URL on the stripline amp. I built the original K2RIW 432 mHz
amp for ATV when we used narrow band black and white video and on carrier
audio. It was nice to step back in time and look at the photos and
documentation.
Thanks and 73,
Ken W2DTC
----------------------------------------------------------------------------
----- Original Message -----
From: skipp isaham
To: amps@contesting.com
Sent: Friday, March 07, 2003 12:06 AM
Subject: [Amps] re: Arcos & Unknown 2m 2x4cx250b designs
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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