[Elecraft] K3 RX issue with KAT3A?

[Guy Olinger K2AV]

Adding the KAT3A gives you the possibility to be listening to a coax jack
with no antenna connected. To get started...

Make sure that CONFIG: KAT3 is *not* set to "not inst".  Be certain of that
by hitting the "ANT" and "RXANT" buttons that you are on the coax connector
you intend. After that there is the possibility that connecting the
mini-coax you may not have seated the mini-coax connectors correctly. When
fully seated, the little tabs on the connectors should be nearly up to the
shoulder of the mini-coax jacks.

73, Guy K2AV

On Mon, Nov 2, 2015 at 10:18 AM, Udo Langenohl - DK5YA <dk5ya at dk5ya.de>
wrote:

> Gents,
>
> in spring I made an upgrade to my K3 (#59xx) with the internal ATU KAT3A.
> After this I guessed that there is a noise drop on all bands from 160 up to
> 10, but was not 100% sure. The strange thing: neighbor stations with
> similar setup always gave much better reports than me, at least 10 dB
> better. I was struggling a lot with my antennas, checked coax every now and
> than etc. but everything was o.k. At that time my main RX became suspicious.
>
> Last week I bought a K3/10W (#39++) from a local ham as a backup here in
> my shack. Comparing both rigs shows a huge difference in sensitivity. Very
> weak signals, almost in the noise on 10 Meters are clearly audible in the
> freshly bought K3 while there's almost nil on my old one. So i fired up my
> HP8664A signal generator today and found my old K3 to be at least 9dB worst
> compared to new one. This is for the main RX in my old K3 while the second
> RX iny my old K3 is almost similar to the new K3 when fed through the AUX
> input (not through ANT 1!!).
>
> So whats going on here? Something broken in my old K3 when I made the
> upgrade with KAT3A? Wrong wired? I have no idea, perhaps you got one?
>
> Udo, DK5YA
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