[Elecraft] Heil Proset Plus with K2

[Geoffrey Mackenzie-Kennedy]

Rolf,

About using the Heil Proset Plus, I forgot to mention ALC behaviour that
Mark, NK8Q, mentioned. With my particular K2/100 #3255 and with no KSB2
mods, the ALC indicator occasionally flickers when I speak in a normal
voice. If I speak louder, it shows a bar or two most of the time. I would
guess that Heil has put a fairly tight tolerance on the mic elements'
output, so I must conclude from the comments on the List that there appears
to be quite a wide variation in Tx gain (mic connector to PA} K2 to K2.
Where the carrier (BFO) is placed on the KSB2's filter skirt could well be
the reason for much of this. The Operator's voice characteristics and where
the mic is positioned would also enter the picture of course.

Here I monitor the Tx output with a 50MHz scope.

If I was to build another K2, I would start with an unmodified KSB2, and
take it from there.

73, Geoff
GM4ESD


----- Original Message -----
From: "Rolf Moberg, OH6KXL" <rolf.moberg at dnainternet.net>
To: <elecraft at mailman.qth.net>
Sent: Tuesday, May 10, 2005 6:15 PM
Subject: [Elecraft] Microphone and BFO questions


> Hello!
>
> Does somebody have first hand knowledge/experience from the following
> topics? I now there are several modifications to KSB2 to increase gain.
> KI6WX has done a great document how to modify it.