Hi Dave,
If the K3 is running Beta MCU 5.26 then there is a new configuration setting
which applies when the KXV3B is installed. Here is the explanation from the
5.26 notes.
* PREAMP 2 and CONFIG:PREAMP2 MENU ENTRY (KXV3B): This menu entry is only
applicable if a KXV3B module is installed (supplied with the K3S). It also
only applies if the current band is 12, 10, or 6 meters. If PREAMP2 is set
to ON, then the PRE switch rotates through settings of OFF, PRE 1, and PRE 2
on the applicable band. PRE 2 turns on the low-noise preamp on the KXV3B
module (+20 dB, with a typical NF of -144 dBm on 12/10/6 meters). When PRE 2
is selected, the PRE icon will flash slowly. Note: Do not use an external
preamplifier (such as an Elecraft PR6 or PR6-10) when using the built-in
low-noise preamp (PRE 2). This would result in excessive gain.
Here are two posts made by Wayne:
On 5/21/2015 7:42 AM, Wayne Burdick wrote:
The addition of the low-noise amplifier for 12-6 meters is the only
change.
The module is compatible with either the K3 or K3S. The manual will
be posted when it's complete.
73,
Wayne
N6KR
On 5/22/2015 5:07 PM, Wayne Burdick wrote:
On May 22, 2015, at 12:41 PM, N2TK, Tony tony@verizon.net wrote:
Preamp 2, on the KXV3B, is in addition to the normal preamp (preamp 1).
But firmware will only let you turn on one or the other -- not both. When
preamp 2 is ON, it totally dominates the noise figure equation, so there's
no value in also turning on preamp 1. Preamp 2 has a gain of 20 dB, while
preamp 1 has a gain of 10 dB.
To turn preamp 2 ON, you first have to enable it on one or more of the
applicable bands using the CONFIG:PREAMP2 menu entry. You can enable it on
12, 10, and 6 meters.
Once preamp 2 is enabled, tapping PRE cycles through OFF/PRE1/PRE2 on the
applicable band. Other bands will only show OFF/PRE1.
When PRE2 is selected, the PRE icon flashes slowly as a reminder.
73,
Wayne
N6KR
73,
Mike K2MK
--
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