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==== PA ==== | ==== PA ==== | ||
* | Zout = (Vcc^2)/(2*Pout) | ||
ref: | ref: | ||
* riguardo la stabilizzazione con feedback rc drain-gate: https://www.radio-kits.co.uk/radio-related/Linear_PA/mtt97.pdf, http://www.infineon.com/dgdl/an-937.pdf?fileId=5546d462533600a40153559ea1481181 | * riguardo la stabilizzazione con feedback rc drain-gate: https://www.radio-kits.co.uk/radio-related/Linear_PA/mtt97.pdf, http://www.infineon.com/dgdl/an-937.pdf?fileId=5546d462533600a40153559ea1481181 | ||
* simile, 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 ==== | ==== RF LPF ==== | ||
Revision as of 19:58, 13 March 2017
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
Zout = (Vcc^2)/(2*Pout)
ref:
- riguardo la stabilizzazione con feedback rc drain-gate: https://www.radio-kits.co.uk/radio-related/Linear_PA/mtt97.pdf, http://www.infineon.com/dgdl/an-937.pdf?fileId=5546d462533600a40153559ea1481181
- simile, 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:
Pretrattamento audio
letture