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g4klx / MMDVM

The firmware for the MMDVM (Multi-Mode Digital Voice Modem)
GNU General Public License v2.0
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EXTERNAL CLOCK 19.2Mhz Problem. #16

Closed ik6qoo closed 8 years ago

ik6qoo commented 8 years ago

I'm compiled the last version of MMDVM with C4FM / DMR Filter and when i enable the external clock the led of TX is always ON and the modem not decode . With internal clock is all ok . I have not tried others TXCO ( 12 or 14.4 ) but I am sure that my clock 19.2 is mounted properly and running. What could be the problem ? it's an error of code ??

73s de IK6QOO Gianluca

iw9grl commented 8 years ago

Gianluca, prova a premere il pulsante di reset dopo aver alimentato arduino dall'usb.... Se funziona ho la soluzione.... 73

ik6qoo commented 8 years ago

Grazie del suggerimento , domani ricarico il firmware per il TXCO esterno e provo nuovamente .

Da: iw9grl [mailto:notifications@github.com] Inviato: venerdì 5 agosto 2016 19.55 A: g4klx/MMDVM MMDVM@noreply.github.com Cc: ik6qoo ik6qoo@gmail.com; Author author@noreply.github.com Oggetto: Re: [g4klx/MMDVM] EXTERNAL CLOCK 19.2Mhz Problem. (#16)

Gianluca, prova a premere il pulsante di reset dopo aver alimentato arduino dall'usb.... Se funziona ho la soluzione.... 73

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ik6qoo commented 8 years ago

Provato il reset ma non funziona .. Ho misurato con un frequenzimetro il pin di arduino dove è collegato il TXCO e leggo perfettamente 19,2Mhz .

iw9grl commented 8 years ago

Stai alimentando il quarzo dai 3.3v di arduino o stai regolando i 5v??? Io avevo un drop sui 3.3v col quarzo collegato e non funzionava nulla, alimentando il quarzo dai 5v con un 78l33 tutto ha funzionato. 73

ik6qoo commented 8 years ago

Ho un regolatore da 3.3 collegato ai 5V di arduino ( schema SP8NHT) , dici di prendere i 3,3 direttamente da arduino ?

iw9grl commented 8 years ago

No non è necessario.... A questo punto non so cosa possa essere, mi spiace

ik6qoo commented 8 years ago

Secondo me è un errore dell’attuale firmaware , aspetto nuovi sviluppi . Grazie comunque !

Da: iw9grl [mailto:notifications@github.com] Inviato: martedì 9 agosto 2016 19.09 A: g4klx/MMDVM MMDVM@noreply.github.com Cc: ik6qoo ik6qoo@gmail.com; Author author@noreply.github.com Oggetto: Re: [g4klx/MMDVM] EXTERNAL CLOCK 19.2Mhz Problem. (#16)

No non è necessario.... A questo punto non so cosa possa essere, mi spiace

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ik6qoo commented 8 years ago

Risolto con external clock 12mhz tutto OK .

vk4tux commented 8 years ago

The clip sine wave txco is not a good design, Use HCMOS > 12.0000 MHz ;

bridge connections > R2, R26, C22 | IC4 not installed, R20 not installed & not bridged. (C20 & others pending install)

http://vk4tux.duckdns.org/6.1/20160818_154426.jpg

On 04/10/16 03:01, ik6qoo wrote:

Risolto con external clock 12mhz tutto OK .

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ik6qoo commented 8 years ago

solved with external clock 12MHz .

TNX

vk4tux commented 8 years ago

19.2 or 14.4 or 12.288 work just as well.

On 04/10/16 17:34, ik6qoo wrote:

solved with external clock 12MHz .

TNX

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