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[TowerTalk] DBS-2 band decoders and Icoms

To: "towertalk" <>
Subject: [TowerTalk] DBS-2 band decoders and Icoms
From: "VE5ZX" <>
Date: Thu, 20 Jul 2006 10:16:36 -0600
List-post: <>
I purchased a pair of never assembled DBS-2 band decoders from an estate 
sale to switch my remote antenna switch.  I am having difficulty getting 
them to work with my Icom 736 and 746 Pro.

The original owner purchased them in Aug '05 for use with a Kenwood and a 
Yaesu. Unfortunately the producer of the product went SK in Mar '05 and it 
is no longer supported. Also, apparently the schematic is not available.

The specs indicate that the decoder can process either a 1200 or 9600 baud 
CI-V data stream and extract the band data. This approach is suppose to get 
around a problem with interpreting the Icom band voltages for the WARC 

With a scope I can see a 5v data stream on the RX pin of the PIC 16F870. 
However, with the decoder and the Icom set for either 1200 or 9600 the PIC 
does not change states when the Icom frequency is changed to initiate the 
data stream. However, I am able to get the DBS-2 to track BCD from TR Log.

Has anyone else had this experience? If yes - has anyone found the solution 
to the problem?


Sylvan Katz - VE5ZX
Saskatoon, SK

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