MMDVM

TX RADIO Motorola GM340

OPAMP MCP6002 http://ww1.microchip.com/downloads/en/devicedoc/21733f.pdf

RX RADIO Icom ID880 (not critical)

TX RADIO Motorola GM950

Tested Yaesu FT7900 extra low TX quality in DMR - unusable.

Final stable system:

RX yeasu FT7900

TX Motorola GM950

MUST HAVE TCXO:

1pcs Vanguard TCXO 0, 1 ppm 12,000 MHZ Ultra Precision GOLDEN

http://www.ebay.it/itm/122141622208?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

RX filter

TX filter

PTT Switch