The D-56 cover 5 bands with 6 traps and is 82' long. The D-52 is said to cover 5 bands with 2 traps and is 105' long.
The D-56 was easy enough to explain - inner traps made it look like a 10-m dipole, next set like a 20-m dipole, third set like a 15/40-m dipole and on 80 m, no traps were visible.
But how would that work with only 2 traps?
So far, not so good. Dips are as follows:
MHz SWR
3.84 1.2:1
7.24 1.6:1
15.00 3.8:1
22.7 2.3:1
32.65 2.7:1
Kindly note that only two of those are within the amateur bands. :-(
There are tuning instructions which, interestingly, only mention 40 and 80 for the D-52.
I'll see if I can do anything by adjusting element length but the ol' D-56 might end up back in the air ... or I'll buy/make something for 15/20.
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