[Elecraft] K3 with Expert 1K-FA, RS232 connections question?

[GLEN BROWN]

I use an Expert with my K3 and made up a cable with both serial and band
data connections.  I ended up using only the band data, with the Expert set
to expect a Yaesu connection.  When you switch bands, the amp selects the
appropriate antenna(s).  The first time you key the amp sees the freq and
sets the tuner without any delay at all.

Otherwise the amp takes up the only serial port available from the K3 and it
is limited to 9600 baud.

I am totally happy with this setup.

73,
Glen W6GJB



On Sun, Jun 27, 2010 at 6:46 AM, Igor Sokolov <ua9cdc at gmail.com> wrote:

> I use CAT data from my K3 to control 1k-FA. I think CAT control has a
> distinct advantage in case of 1K-FA because the internal antenna tuner in
> Expert usually has several settings per band. That is especially important
> on wide bands like 160 or 80 meters. With CAT control these tuner settings
> are correctly chosen in RX mode. That improves receiving as well as avoids
> tuner relays switching at the beginning of the transmission.
>
> 73, Igor UA9CDC
>
>
>
> >
> > Andy,
> >
> > If you are using computer control of the K3, you will probably
> > have better results if you use the DB15HD connection (BCD Band
> > Data) to control the Expert 1K-FA than trying to parallel the
> > RS-232 (CAT) connections.  With the "Band Data" connection the
> > 1K-FA operates as if it were connected to a Yaesu transceiver.
> >
> > I will send you separately an old drawing by the former Expert
> > distributor showing both (Band Data and CAT) connections.
> >
> > 73,
> >
> >    ... Joe, W4TV
> >
> > On 6/27/2010 8:22 AM, GD0TEP wrote:
> >> Hello to the group again,
> >>
> >> I want to connect my K3 to my 1K-FA amplifier, the amplifier manual
> >> isn't to clear (to me anyway) on the connections that need to be
> >> used.
> >>
> >> On the amplifier 15pin plug, I use pins 1, 9&  14, yes it's that
> >> simple.
> >>
> >> On the K3 RS232 I connect the amplifier pin 1 to K3 pin 3 (I think, I
> >> may have these two crossed) On the K3 RS232 I connect the amplifier
> >> pin 9 to K3 pin 2 (I think, I may have these two crossed)
> >>
> >> And
> >>
> >> On the K3 RS232 I connect the amplifier pin 9 to K3 pin 5 as ground
> >>
> >> Within the K3 RS232 I need to link the RST and CTS together, well RTS
> >> is pin 7 on the K3, but what pin is the CTS????
> >>
> >> Advice would be greatly appreciated.
> >>
> >> 73, Andy http://gd0tep.com
> >>
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