[Elecraft] A mod. request for the K3 Band0-Band3 output

[Luigi Casari]

Regards to all
I am building an interface to decode the present signals on the Band0-Band3 
output.
This using an IC CD4067BE, the intention is to have a positive tension on 
the various bands (for switch some rx preampl. or switch some antennas), a 
general PTT for the HF band and a PTT for the 50MHz.
On the 144MHz I need a PTT  and a +12V on RX for the external preamplifier.

I have the K144XV module and I have too the PR6 preamplifier for the 50 MHz.

So the DIGIOUT1 signal is already used for the preamplifier, the question is 
as know when the K3 is on the 144MHZ seen that the BAND0 to BAND3 goes to 0V 
and this is the same condition used for 60m band.

It is not possible to use TRN1-TRN9 because even they go out on the same 
pinof the BAND3 to 0  and they have address used in HF.

INT TRN1 status is used for the 144MHz module and is not present on the 
external connector of the K3 otherwise with a logical circuit it easy to 
reads the status and rebuild a PTT and a 12V in RX.

Is possible have an other condition on this 4 pin fo 144MHz that there are 
still 5 more free possibilities on 16 channel multiplexer/demultiplexer ?

For example BAND3=1, BAND 2=1, BAND1=0 and BAND0=0.

This is simple mod on firmware I suppose| and simplifies the life to anyone 
wants build an interfaces for controlling various PA and preamplifiers.

73, Luigi HB9CXZ
hb9cxz at ticino.com