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  QSL image for F6ARC

F6ARC France flag France

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F6ARC - FG/F6ARC - FM/F6ARC, please QSLs via bureau or direct with a SAE envelope and 1 US dollar (EU), 2 US dollars (Outside EU) or one valid IRC, to: FE11DX, STEPHANE LAIGNEAU 1 RESIDENCE FRANCOIS FOREAU 28110 LUCE - FRANCE

Once again, I was active as FG/F6ARC from Guadeloupe (NA-102) in March. If you wish to book your holiday here, ask Marie-Claude for the "Rose" house. There is more space available around to put up low band antennas. 

    

Activity was holiday style: 4575 QSO's (+ 241 dupes) in 13 days, running 100 watts into inverted V antennas (one single coax cable). First, many dupes in the log: I guess some users of DX Clusters rely blindly on incorrect spots. Secondly, the behavior of certain EU stations leaves something to be desired  no

"God gave us two ears and one mouth, so we ought to listen twice as much as we speak"  ~Irish Proverb~


 

Moxon Rectangle on 20m, Reflector-Radiator Yagi on 15m, Radiator-Director Yagi on 10m.

Computer simulations have shown a slight but significant improvement in both forward gain and front-to-back ratio on 10m due to the presence of the 15m Reflector (sometimes called "forward stagger effect"). The forward gain of a Moxon Rectangle is almost the same as a full-size two-element Yagi. So why choose the Moxon version rather than its "big sister"? Because this design offers certain advantages:

  • smaller footprint (28% less width than the Yagi),
  • minimal movement in high winds (well-balanced antenna),
  • direct 50-ohm connection (no matching system required),
  • wide bandwidth (max 1.3:1 SWR at band edges),
  • wide beamwidth (no need to be pointed precisely in the right direction),
  • outstanding F/B ratio (20-25 dB; particularly useful on the crowded 20m band).

I have been using this tribander since May 2013. Bear in mind that only two elements are active on each band, therefore it can't compete with multi-element monobanders. Although tests were carried out without another antenna as reference, I have made enough tests to rate its performance. I live out in the country, but soil quality is rather poor (sandy). The antenna is less than 14 meters (45.9 ft) above the ground, fed with 45 meters (147 ft) of RG-213 coaxial cable. However, the least I can say is that the results are well beyond my expectations. I hardly ever wait to break a pileup! Another feature of this tribander is that although it is not designed for 24 MHz, I am able to use it on the 12m band with 100 watts, through the ATU (high SWR) of the transceiver. There is some directivity and gain due to the presence of the other elements.

In conclusion, I would say that this multiband beam is a good compromise for those who have antenna restrictions. The only potential issue (and only for those lacking sufficient mechanical knowledge) is the bending of the corner sections. Perhaps that's the price to pay for getting optimal performance from such a small antenna.

"If the Moxon Rectangle didn't exist, you'd have to invent it."

Multi-band 20/15/12/10m antenna

Feb 16, 2014: two elements (reflector-driver combination) operating on 24 MHz have been added to the original model. The next step will be the addition of the 17m band (18 MHz).

Last modified: 2014-04-17 14:51:47, 9049 bytes

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