[TowerTalk] 6 x 2 unit...

[Roger (K8RI) on TT]

The original post stated a different protocol, but Binary Coded Decimal  
(BCD) is simple and decoding chips are cheap!
Counting to 10 in binary only takes 4 wires, or outputs.  I've never 
looked at the outputs on mine.
I built a number of BCD decoders with opto isolators on perf board  to 
control relays when I was a tech.

  The 4  lines out are as follows. (1,2,4,8) No lines activated = zero.  
The first line high = one, the second line = two. The first and second 
high = three ( 1 + 2 = 3), the third line = 4 (just add the consecutive 
lines as you count to 10).  Yes, you can count higher with 4 lines, but 
the encoders rarely go above 10.

It just take a decoder chip and the control chips to actuate the relays, 
plus either pull down, or pull up resistors.

Having a board already laid out makes building a band decoder/controller 
very easy and much neater than perf board.

73

73

Roger  (K8RI)



On 4/17/2016 Sunday 9:37 PM, Gary Huber wrote:
> For a band decoder, I used the UM BCD-10 (now BCD-14), (see 
> http://www.unifiedmicro.com/BCD_14_MAN.pdf). Very easy to configure 
> using DXLabs, Commander,  Configuration, and a device table to output 
> a BCD value to the band decoder (see 
> http://www.dxlabsuite.com/dxlabwiki/ControlAntennaSwitch)
>
> 73 ES DX,
> Gary - AB9M
>
> On 4/17/2016 6:13 PM, Douglas Ruz / CO8DM wrote:
>> Hi,
>>
>>
>> I am building a simple as possible SO2R configuration.
>>
>>
>> I need some advices about a 6 x 2 antenna relay unit.I prefer a kit 
>> because
>> it is cheaper.
>>
>>
>> I think I need build also a Band decoder.any idea?
>>
>>
>> Thanks,
>>
>>
>> Doug, CO8DM
>>
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-- 

73

Roger (K8RI)


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