Hello,
In my qth you need at least 30 dBm (1 Watt) for reliable measurements with a
broadband detector. The 160m antenna picks up such an amount of signals that
with less power you do not get correct results. I allways use a selective
methode with bridge, receiver and signal source.
Kees, PE5T
--------------------------------------------------
From: "Tom W8JI" <w8ji@w8ji.com>
Sent: Wednesday, March 05, 2014 7:08 PM
To: "Paul Christensen" <w9ac@arrl.net>; "topband" <topband@contesting.com>
Subject: Re: Topband: New MFJ 259C available
Hi Paul,
Where is a selectivity spec or a description??
73 Tom
----- Original Message -----
From: "Paul Christensen" <w9ac@arrl.net>
To: "topband" <topband@contesting.com>
Sent: Wednesday, March 05, 2014 10:15 AM
Subject: Re: Topband: New MFJ 259C available
+13 dBm is nothing. That is only 20 milliwatts or 1 volt across 50 ohms
if that is at 50 ohms.
+13 dBm may be more than adequate depending on that unit's (AA-54)
selectivity. I would like to see it's real world performance in the
presence of a strong AMBC field. For the CIA/VNA class of analyzers with
their high selectivity, that power level is definitely more than
sufficient.
Paul, W9AC
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