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Content 4/4

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

Sep 28,2020
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