Categories
DX Commander Youtube

How to make a shortened 40m Vertical – DX Commander #Rapide

How to make a shortened 40m Vertical - DX Commander #Rapide

OK, so we cracked the all-band-vertical for the DX Commander Rapide to incorporate the 40m element in place of the 30m element. Here is the cut chart:

Cut your elements this long:

10m 2.65m
12m 3.04m
15m 3.21m
17m 3.81m
20m 4.78
40m 10.03

For every band (not 40m) create a 6cm loop and secure with electrical tape (don’t add 6cm to the cut, just create it after cutting)

40m Region 1 (7.00 to 7.200 MHz) Wrap 14 turns of wire just below the white band on the pole (about 24cm up from the base) then continue to top and come back down 60cm. This assumes your pole is 6.5m long.

40m Region 2 (say you need 7.200 to 7.300 MHz) Wrap 13 turns of wire just below the white band on the pole (about 24cm up from the base) then continue to top and come back down 130cm. This assumes your pole is 6.5m long

Fine tuning can be made by cutting or adding wire to the fold-back element atg the very top. Bear in mind that each turn of the coil is around 220 kHz change. So if your best SWR is at 7.22MHz, ,removing one turn will centre you at 7.00MHz.