[amsat-bb] Re: lvb tracker circuit -- xtal?

[Nigel Gunn G8IFF/W8IFF]

Crystal probably sets the serial bit rate but I wouldexpect the display to still work.

Stefano Simonetti wrote:
> Hi, I have problems in making the LVB tracker circuit run.
> 
> I have built the LVB tracker ver. PCB v1.2, Firmware v0.7, Programmer v0.2, Documentation v1.9,  7 Dec 2004, by G6LVB.
> 
> The firmware was flashed successfully with IC-PROG v 1.06B, a homebrewed interface for LPT, and an old PC with LPT1 running win98.   
> 
> The LVB circuit requires a 4 MHz XTAL for the PIC 16F876A.
> 
> I tried with a 10MHz, and a 3,5795MHz as I haven't a 4MHz. No success. No LCD, no serial communication at all.
> 
> Does anybody know if the problem could be in having installed a different xtal (i.e.: does the firmware takes care about the frequency of the clock?)?
> 
> Regards, Stefano Simonetti (IW1RDZ) - Italy.
> 
> 
>       
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-- 
Nigel A. Gunn,  1865 El Camino Drive, Xenia, OH 45385-1115, USA.  tel +1 937 825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF),  e-mail nigel at ngunn.net       www  http://www.ngunn.net
Member of  ARRL, GQRP #11396, QRPARCI #11644, SOC #548,  Flying Pigs QRP Club International #385,
            Dayton ARA #2128, AMSAT-NA LM-1691,  AMSAT-UK 0182, MKARS,  ALC, GCARES, XWARN.