[HomeBrew] SWR Meter

Tue, 7 Oct 2003 07:21:51 -0400

Hi Jim,
Jim WB2FCN here. A question or two is in order here. Did you check the
resistors in
your circuit, are they the same value for forward and reverse positions?
Next is the unit
setup for 52 ohm (50) or 72 ohm use? Then is the cable in use for
connections the right
one? and lastly is it really terminated in the impedance it is designed for?

If the resistors are bad or out of tolerance, that will cause high or
erroneous readings. If
the termination in use is not correct same thing. Is anything else in the
line to the
termination device (load) like an RF "T" connector, if so remove it and try
again. A
description of your test setup might help in finding this problem.
Jim
WB2FCN
http://eshop1.chem.buffalo.edu

----- Original Message -----
From: "Jim Miller" <[email protected]>
To: <[email protected]>
Sent: Monday, October 06, 2003 11:43 PM
Subject: [HomeBrew] SWR Meter

> ** Please do NOT cross-post messages to multiple mailing lists on the
"To:" or "CC:" line of the e-mail message. **
>
> I have an SWR meter and I can't believe I can't fix it.  There is nothing
in
> it.  Two diodes, replaced them (with silicone signal diodes) did not fix
it.
> (Are these supposed to be germanium?)  Let's say your real swr is 1.7 -
this
> thing shows 7 or 8 to 1.  Similar results after the diode swap (not sure
of
> the actual measurement but it sure didn't fix it).  It doesn't have any
> laminations that I can find cracked and I resoldered all the connections.
> It is the old 4 1/2 inch Drake style meter.  I am about to give in to the
> meter itself being bad but am still stuck with the idea that a lot of
other
> problems get blamed on "bad meter" and it is usually something else.
>
> Your thoughts
> Tnx es 73, de Jim KG0KP.
>
>
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