2008-12-02

No happy

Got the Spi-Ro D-52 the other day. It got to 60 F here today, so I left work early and put it up, as always with a ton of help from Spouse.

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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