Cecil Moore wrote:
Dave wrote:

Howdy...I am interested in building a cheap and easy band decoder for
an icom 706mkIIg that will ultimately be used for switching relays on a
remote antenna switch. I have searched around and found a few people
that make them and offer kits, but would like to see if anyone has
built one with good results. Any help or ideas would greatly be
appreciated...


Too bad it's not an IC-745 which has an analog voltage output
proportional to the pre-WARC ham bands.


The 706 (on pin 5 of the 13 pin accessory socket) still has the Icom
analog voltage output based on the selected band BUT unfortunately it is
not a unique decoding. From some notes of mine it looks like:
160m = 7.0-8.0V
80-75m = 6.0-6.8V
40m = 5.0-5.8V
30m = 0V
20m = 4.0-4.8V
17m-15m = 3.0-3.8V
12m-10m = 2.0-2.8V
6m-2m = 1.0-1.9V
When I realized that 17m and 15m decode the same and 12m and 10m decode
the same I dropped the project. However this may not concern you. The
best way is to decode the CIV bus and read the frequency on the bus but
this is more complicated.

73,
Larry, W0QE