[Elecraft] [KAT500] Cabling Diagram

[Gary Gregory]

The auxbus cable from the K3 to kat500 then kpa500 works fine with no user
adjustment required here. In early FT days we saw this on odd occasions but
the FW version 01.15 for the kpa500 resolved this by slowing down hi vswr
detection by the amplifier which caused the kpa500 to fault on occasion but
not necessarily every time as it depended on how bad the vswr sample was as
seen by the kpa500. Slowing it down eliminated this issue for me at least.



Gary

On 7 December 2012 09:42, hawley, charles j jr <c-hawley at illinois.edu>wrote:

> I think what happens is that the K3 puts out rf faster than the KAT500 can
> interrupt the key line when it goes into the tune mode. Using the key line
> interrupter on the cable is really only for bringing the key line out of
> the cable to include other non-Elecraft key lines in series.
> So...the only thing I can think of at the moment is to break the key line
> somehow when using the cable interrupter and press-hold of the xmit (the
> "tune") button. The K3 has to do it when pressing the "tune" button. Is
> there some way of doing that in menu?
>
> Sent from my iPad
> Chuck, KE9UW
> (Jack for BMW motorcycles)
>
> On Dec 6, 2012, at 3:53 PM, "Roy Morris" <w4wfb at carolina.rr.com> wrote:
>
> > I have connected the cables as shown on page 6 of the KAT500 Automatic
> Antenna Tuner Owner's Manual, revision B3, November 20, 2012.  I am
> connecting the K3, KPA500 and KAT500 using the DB15 interface cables and
> the two RCA (yellow end) cables for the separate key line.  This diagram
> shows the key line interrupter inserted between the DB15 cable and the K3
> ACC socket.  I have not inserted the key line interrupter, and the system
> seems to work fine.  However, I DO have to change the KPA500 from OPERATE
> to STANDBY when changing frequency because leaving it in the OPERATE
> position may cause the amp to FAULT when I hold the XMIT button on the K3.
>  I believe the tuner is trying to search with high power.  I wonder if
> inserting my key line interrupter would prevent this.  All frequencies had
> been previously memorized by the KAT500.  Thanks.  Roy Morris  W4WFB
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-- 
*Gary - VK1ZZ
Motorhome Portable
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*Elecraft K3
P3 Panadapter
KPA500FT
KAT500FT**
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