Multi Band LPF Module for uSDX – An Arduino Based SDR All Mode HF Transceiver
Multiband module pcb is a pluggable band specific module that incorporates both the PA L/C pair and the 7 pole LPF. This way customized band modules can be build for each band we wish to operate uSDX on.
For each band a customized band module is needed meaning that all PA L/C pair values and LPF L/C values are calculated for that band we want to operate on. These pluggable modules for the desired band is switched to operate on a specific band before turning on the TRX. It is like vintage WW2 transceivers where the crystals were plugged for the operating frequency selected.
All credits to BARBAROS A?URO?LU , check his site for components for each band and more info !!
you need the transceiver PCB
Here are the values of multi band module components for each band:
80m Band:
L1-T37-2 / 25 turns
L2-T37-2 / 27 turns
L3- T37-2/27 turns
L4- T37-2/24 turns
C1-470pf
C2-1200pf
C3- 1200pf
C4-470pf
C5-180pf
60m Band:
L1-T37-2 / 23 turns
L2-T37-2 / 24 turns
L3- T37-2/23 turns
L4- T37-2/24 turns
C1-680pf
C2-1200pf
C3- 1200pf
C4-680pf
C5-30pf + 56pf in parallel
40m Band:
L1-T37-6 / 21 turns
L2-T37-6 / 24 turns
L3- T37-6/21 turns
L4- T37-2/16 turns
C1-270pf
C2-680pf
C3- 680pf
C4-270pf
C5-56pf
30m Band:
L1-T37-6 / 19 turns
L2-T37-6 / 20 turns
L3- T37-6/19 turns
L4- T37-2/14 turns
C1-270pf
C2-560pf
C3- 560pf
C4-270pf
C5-30pf
20m Band:
L1-T37-6 / 16 turns
L2-T37-6 / 17 turns
L3- T37-6/16 turns
L4- T37-2/10 turns
C1-180pf
C2-390pf
C3- 390pf
C4-180pf
C5-30pf
17m Band:
L1-T37-6 / 13 turns
L2-T37-6 / 15 turns
L3- T37-6/13 turns
L4- T37-2/9 turns
C1-100pf
C2-270pf
C3- 270pf
C4-100pf
C5-30pf
Multi Band LPF Module for uSDX – An Arduino Based SDR All Mode HF Transceiver
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- Engineer Oct 24,2021
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