[amsat-bb] TAPR JAMSAT TRAKBOX Questions

[Joe Leikhim]

Well it is definitely not the switch. The BCD values are correct. What 
is happening is that rather frequently it will misread memory position 3 
as position 1 and then will hang with that satellite regardless of the 
BCD values of the switch. When it does work, it will properly select all 
the memories until I pass terminal mode and then , even with a reset, it 
wont read properly past position 2 again. I re-seated the IC where the 
BCD inputs are buffered, but no joy. The bus voltage does look a bit shy 
of 5V but I don't think that should be a concern.  Has anyone with the 
turbo upgrade reported this?

This TrakBox is a real clean build so I doubt any problems with bad 
solder. I will check the power regulator tomorrow. Just really curious 
if anyone is using these still and if they are having troubles. Yes I 
know there are more modern solutions, but this is entirely standalone 
and does have doppler correction.

Joe


On 7/18/2018 1:39 AM, Joe Leikhim wrote:
> I am on a mission to complete all my nagging projects.
>
> I have a TAPR JAMSAT TRAKBOX that I modified for Y2K and Turbo a while 
> back and I am now going to replace the ancient BR lithium battery with 
> a fresh one and install a backlighted LCD display. I find today the 16 
> position alphanumeric BCD switch seems flaky and unresponsive. Is that 
> the electronics ignoring it for some reason or do these switches fail?
>
> If the latter, does anyone know of a source of that specific 
> pushbutton BCD switch?
>
> Also has anyone used a USB to serial adaptor with th TRAKBOX?
>
>

-- 
Joe Leikhim


Leikhim and Associates

Communications Consultants

Oviedo, Florida

JLeikhim at Leikhim.com

407-982-0446

WWW.LEIKHIM.COM