[Elecraft] Problems with Top Ten Decoder?

[Don Wilhelm]

Dan,

Did you include a connection to ground (ACC pin 5 or 12)?  Behavior like 
that indicates that something (like ground) is not properly connected.  
Are you certain you counted th eDE-15 pins correctly?  If you look 
closely, the pin numbers are stamped into the housing plastic insulator.

73,
Don W3FPR

Dan Levin wrote:
> I'm having an odd problem with two brand new Top Ten decoders and two
> different K3's.  In each case, the decoder is having problems pulling up the
> band data lines coming in from the K3.  All four band data lines measure at
> 5 volts without the K3 connected (thanks to the decoder's pull-up
> resistors), but only between 1.6 and 2.1 volts with the K3 connected (on
> lines that should be "on" - lines that should be "off" read zero volts).
> Turns out that isn't a high enough voltage for the decoder chip to read
> properly, so the band decoder doesn't work.
>
> I strongly suspect operator error, but can't figure out what I am doing
> wrong.
>
> Hints?
>   
>