Thanks guys. This is how it is behaving. I don't have a schematic for
the KPA-500 so it is impossible to determine if there are pullup
resistors or not.
Glad that Elecraft firmware recognizes that if the band is undefined, RF
sensing of the band become active.
73 de Brian/K3KO
On 1/5/2013 16:02, Don Wilhelm wrote:
Brian,
OK, Jack Brindle sent me a correction - open BCD lines are at a high
level, not low, so the band is undefined. Also, the AUXBUS is not in
use for this situation.
Sorry for the confusion.
73,
Don W3FPR
------------------------------------
Brian,
The open BCD lines should signal 60 meters to the KPA500. See the band
data chart in the K3 manual.
The normal way the KPA500 works (with the K3) when you press a band
button on the KPA500, it communicates that information to the K3 over
the AUXBUS - the KPA500 does not receive information from the K3 over
the AUXBUS, information flows only from the KPA500 to the K3.
Then the KPA500 waits until the K3 switches bands and presents data on
its BCD outputs - at that time, the KPA500 switches to the same band as
the K3.
Are you breaking the K3 to KPA500 BCD outputs with your antenna
switching hardware? Ideally I would think the antenna switching would
only listen in on the K3 BCD outputs and react accordingly, but you may
have implemented something more complex.
73,
Don W3FPR
On 1/5/2013 8:34 AM, Brian Alsop wrote:
Question: What "band" is selected when the Radio=BCD and the inputs
are open?
It appears to revert to RF sensing.
The situation is this. Antenna switching stuff automatically echos
the band BCD data to the KPA-500. The exception is if one manually
selects an antenna. In that case power to the auto mode PIC is turned
off and one gets whatever the PIC outputs are with no supplied Vss.
73 de Brian/K3KO
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