MeoW

Transmettitore ad onde medie

Specifiche

• prezzo <= 50 euro
• potenza >= 50 W
• senza assemblaggi SMD

Sezioni

Scheda madre

• Filtraggio alimentazione
• LPF audio 5 khz
• uC controllo

Moduli aggiuntivi

DDS

• https://www.aliexpress.com/item/New-AD9850-DDS-Signal-Generator-Module-0-40MHz-Test-Equipment/32328648512.html che espone il piedino 12 (Rset)

controllato da Ondeggiatore

PA

• in kit https://www.aliexpress.com/item/New-45W-SSB-linear-Power-Amplifier-Kits-With-low-pass-filter-for-transceiver-Radio-HF-FM/32574683152.html - 45W, 12-15v

RF LPF

Induttanze in materiale 2:

• T50-2 AL=4.9
• T68-2 AL=5.7

uH=(AL*(Giri^2))/1000

Giri=sqrt((uH*1000)/AL)

Freq	C1	L2	C3	L4/C4	C5	L6	C7
1000	2986	9,377	4556	8,516/680	4556	9,377	2986
1500	1990	6,25	3037	5,44/453	3037	6,25	1990
500	5972	18,754	9112	17/1360	9112	18,754	5972

rif:

• http://toroids.info/T50-2.php
• http://www.gqrp.com/Datasheet_W3NQN.pdf

Pretrattamento audio

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letture

• http://www.nu9n.com/am.html
• http://www.chezradio.com/index_htm_files/lpamhandbook.pdf