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

Sat Aug 22 17:44:46 PDT 2009

Yes, depending on the software the xtal rate could affect both serial comms 
and lcd display operation.

If you can't find a 4 mhz crystal quickly, let me know.

73,

Steve  W5ZA            Shreveport, La.

----- Original Message ----- 
From: "Stefano Simonetti" <iw1rdz at yahoo.it>
To: <amsat-bb at amsat.org>
Sent: Saturday, August 22, 2009 5:36 PM
Subject: [amsat-bb] Re: lvb tracker circuit -- xtal?

I 've read now the .c file included in the lvb distribution, I noticed that 
xtal frequency surely affects the baud rate.

I will find a 4 Mhz xtal, sorry for BW.

________________________________
Da: Stefano Simonetti <iw1rdz at yahoo.it>
A: amsat-bb at amsat.org
Inviato: Sabato 22 agosto 2009, 23:45:29
Oggetto: [amsat-bb] lvb tracker circuit -- xtal?

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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