[SFDXA] FW7JV from Wallis

[Bill]

    Jun 24: FW7JV from Wallis -- Test Operation

Starting on June 25 we will be testing new antennas from Wallis Island 
(FW), operating as FW7JV. This will be a realistic test using RIB-s and 
antennas mounted on a sand-bar in a situation very similar to what we 
will have on Jarvis Island during the upcoming N5J Jarvis operation. (I 
will be going ashore this afternoon to see the village chief with a 
bottle of scotch, trying to get permission to set up on small cay 
nearby. Fingers crossed.)

The most important test will be of the new 160 - 10 meter vertical. This 
is a 45' tall -- I should say, 45' short -- vertical without top loading 
wires. The low height is mandated by the US FWS, written into our 
Special Use Permit. Further, our permit specifically states that any 
time our antennas cause harm to birds, the FWS representative on site 
will shut us down. Therefore we are making sure that the antennas are as 
bird-friendly as possible. From experience on Ducie and Cook Islands 
(VP6A and E51D) we know that vertical masts of some diameter are easily 
seen by birds and avoided, even at night. Horizontal or sloping wires, 
however, especially when high, even with streamers can be hit by birds. 
Another danger posed by high wires is that birds want land on them and 
wire can easily twist around their legs, trapping them. Therefore the 
new antenna does not have any top loading wires. Instead, we have a 
large 34 micro Henry inductor at the base of the antenna that brings 
this short antenna closer to resonance, with a feed point impedance that 
is within the tuning range of the base mounted antenna coupler. This is 
a serious compromise because losses in the inductor can be substantial. 
Hence the detailed testing we have been doing since T32JV in May and now 
on Wallis.

For details see the ANTENNAS tab.

*160 m Operation from Wallis:*

FW7JV will be on 160 meters CW starting at local SS around 0600 UTC and 
again at 0900 for NA SR, as well as at local SR at 1700. We need actual 
signal reports to get an idea of how the new antenna is working. Wallis 
is about 1400 miles further SW from NA than Jarvis. If you can work us 
from here you can be pretty sure that you can get into the N5J log in 
August. (Note that while Jarvis is only #75 on TB, FW is #28 according 
to Clublog.)

*https://jarvisisland2024.com/news/91-jun-24-fw7jv-from-wallis-test-operation*

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