The gain can easily be made up, and is, but NF can not be made up in later
stages once it is set in an earlier one. Anything connected to the IF port can
only increase NF, no matter how quiet it is or how much gain it has. The
easiest way to improve composite NF would be to add a strong, low noise preamp
with adequate gain AHEAD of the K3, but that would compromise IMD.
There would be no reason to un-modify a K3 to work with any kind of panadapter connected to the IF port.
73,
Larry N8LP
Message: 37
Date: Fri, 22 Aug 2008 16:50:46 -0400
From: Don Wilhelm <[EMAIL PROTECTED]>
Subject: Re: [Elecraft] K3 Buffer Mod
To: Jerry Flanders <[EMAIL PROTECTED]>
Cc: [email protected]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Jerry,
I do agree with you. There is a requirement for an isolation amplifier
anyhow, so I do not understand why the -17.7 dB cannot be made up in the
isolation amplifier if the device to be driven needs input at the same
level as the antenna signal.
Should Elecraft ever come out with a device (Panadapter?) that is
designed to connect to the IF out at the level it currently is designed
for, any K3 that has been modified will require that the modification be
removed.
73,
Don W3FPR
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