[Elecraft] K3s and DEMI transverter

[Dave Fugleberg]

I use three Elecraft and one DEMI transverters with my K3. All split IF at
28 MHz, single antenna path for each, PTT low.

I’d go with the high stability LO, especially at 432 or higher. The lower
level drive works fine with the K3 and I believe the K3S transverter
interface is identical in that regard. You can set it on a per transverter
basis to get the drive you need. If you intend to use the same transverter
on a different radio that does not provide a low level drive or a split IF,
your choices may be different.

One other thing to consider is how to select the active transverter if you
add more than one. The Elecraft transverters have that built in, as they
can read the Aux bus. For others you may need some external switching so
that you only key the transverter that is selected. I use a band decoder
from unified Microsystems for this. Of course if you connect only one
transverter to your K3S that’s not an issue.


On Wed, Jun 2, 2021 at 8:33 AM W8JH <jh at hoffmaninv.com> wrote:

> I am looking to add the DEMI (Q5) transverter to my K3s and have no
> experience with transverters other than the internal one in my KX3.  In the
> future, I may wish to progress to 2m EME as well.
>
> Here are some choices I need to make and I would appreciate any advice:
>
> Common IF vs Split IF.  I'm thinking split IF with a K3s?
>
> Common RF or Split RF.  Common RF for one antenna connection?
>
> IF drive level of -20 to 0dBm vs 0dBm to +20dBm.  I think the K3s
> transverter output is 0dBm so I'm not sure what to think here.
>
> PTT polarity low instead of high I'm thinking.
>
> High stability Local Oscillator vs. standard.
>
> I could get a custom IF and I think there is some slight advantage to a
> 14mHz custom but I'm guessing the 28mHz standard IF is good enough?
>
> Thanks in advance for any advice or references.
>
>
>
>
>
> -----
> 73,
>
> Joe, W8JH
>
> K3s, KPA 500, KAT 500 and  KX3 happy user.
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
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