[Antennas] Problems with my DENTRON WM-2 WATTMETER

Wed, 10 Sep 2003 06:50:30 -0400 (Eastern Standard Time)

 =0D
 =0D
-------Original Message-------=0D
 =0D
From: JAB (EA5XQ)=0D
Date: Wednesday, September 10, 2003 6:14:35 AM=0D
To: [email protected]=0D
Subject: [Antennas] Problems with my DENTRON WM-2 WATTMETER=0D
 =0D
Hi to all,=0D
 =0D
I bought recently a second hand (via eBay) DENTRON WM-2 WATTMETER and now=
=0D
I'm facing several troubles that I do not know how to fix for the time be=
ing
=0D
 =0D
It seems that, and was identified in 17m, that the meter introduces a lot=
=0D
of noise in the band and also changed completely the SWR graph of the=0D
antenna. The noise I discovered that was produced by a near computer -wit=
h=0D
my CN101 meter it did not happen- and moreover the meter was RADIATING as=
=0D
it was affecting a lot (in 17m and 15m) the computer, a clock close to th=
e=0D
meter and other devices (it did not happen neither with the other meter
CN101).=0D
 =0D
Anyone could provide me a schematic of the meter and ideas about how to=0D
avoid such radiation?=0D
 =0D
Thanks=0D
 =0D
73 Juan, EA5XQ=0D
=0D
Hi Juan,=0D
=0D
The first thing I would check is for good connection of the coax..  See i=
f
the Coax connectors are all tight.. if they used rivets to attach the So =
239
s Female connectors then carefully drill them out and replace them with
bolts and nuts.  making sure any cabinet paint is removed from under the
connector.. if it's a single whole connector , make sure it is tight in t=
he
case and that the case and the connector have good contact with each othe=
r.=20
  Usually this problem is caused by poor coaxial sheild connection to the
meter.  if the meter connectors are ok check all your Pl 259's for good c=
oax
braid connections.   I've also seen on meter that had a bad by-pass cap t=
hat
caused a similar problem.=0D
Sorry I do not have a copy of the manual for this meter.=0D
hope this is of help,=0D
73 Dave kc1di =0D
=0D
=0D
-------------------------------------------------------------------------=
----
-----------------------------------------------=0D
EA5XQ, QRA:Juan, QTH:Almazora, LOC:IM99XW=0D
MEMBER OF/MIEMBRO DE: URE (www.ure.es) y/and SLUREVILL (Secci=F3n Local U=
RE=0D
Villarreal - http://slurevill.iespana.es/slurevill)=0D
CLUBS: G-QRP #9805, QRP-L #1461, EA-QRP #471, EACW #309=0D
E-MAIL: [email protected]=0D
MSMESSENGER: [email protected]=0D
WEB SITE: http://www.qsl.net/ea5xq=0D
(english version in http://www.qsl.net/ea5xq/index_eng.html )=0D
-------------------------------------------------------------------------=
----
-----------------------------------------------=0D
 =0D
--- StripMime Report -- processed MIME parts ---=0D
multipart/alternative=0D
text/plain (text body -- kept)=0D
text/html=0D
The reason this message is shown is because the post was in HTML=0D
or had an attachment. Attachments are not allowed. To learn how=0D
to post in Plain-Text go to: http://www.expita.com/nomime.html ---=0D
- - -=0D
 =0D
Your moderator for this list is:=0D
Larry Wilson KE1HZ [email protected]=0D
_______________________________________________=0D
Antennas mailing list=0D
[email protected]=0D
http://mailman.qth.net/mailman/listinfo/antennas=0D
 =0D
=2E