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Reviews Categories | Antennas: HF: Vertical, Wire, Loop | EFHW-4010-HP Help


Reviews Summary for EFHW-4010-HP
EFHW-4010-HP Reviews: 1 Average rating: 5.0/5 MSRP: $150
Description: EFHW-4010-HP 1500W Multi-Band End Fed Half Wave Antenna

This is an End-Fed Half-Wave (EFHW*) antenna for
40/20/15/10m bands. Unlike many END FED antennas on the
market, this one does not require the Antenna Tuner to
operate. It is resonant Half wave on 40m (7MHz) therefore
also resonant on second, third and fourth harmonics. Due
to High Impedance feed point, the antenna is less height
dependent. You can put it up at 10 or 50 feet in the air
without much change in VSWR values.
Product is in production.
More info: http://myantennas.com/wp/product/efhw-4010-hp/
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NO9E Rating: 5/5 Nov 12, 2016 08:43 Send this review to a friend
Ideal for high-power lightweight dxpeditions  Time owned: 0 to 3 months
I was going for dxpeditions with KX3 + Expert 1.3k combination that weighs only 15kg and can easily generate KW. The question was what antenna to use that would have SWR < 3:1 on multiple bands. One option was a 40ft vertical or inverted V and a tuner. But a manual tuner is large and needs time for tuning, and an automatic tuner would also be loud. A multiband vertical (few wires on a fiberglass pole) would cover at most few bands and would pick up lots of noise and could be inefficient. Then I heard about the high power endfeds: EFHW4010HP (40-20-15-10) and EFHW8010HP (all 80-10). The first one weighs 1 kg and a cable to convert it to 8010HP weighs an extra 0.5 kg.

When running at a KW level the box is barely warm on some bands and warmer but not hot on other bands. SWR mostly < 1.3 but <2 on some, which Expert 1.3k can easily match. As the coax is an extension of the antenna and can be RF warm (but not hot), I added a makeshift balun of a few turns of coax around a toroid some 20ft (not critical) from the matching box. This reduced SWR and eliminated any RF touch.

I tried the endfeds low and high and SWR did not change much. Having all the weight on a side is very convenient as it reduces load on a support and makes the coax connection shorter, especially when installed as inv V.

As CE0Y/NO9E I used EFHW4010HP set as inv V on 12m Spiderpole and made > 2000 QSOs on 40-20-15-10. Big pileups. Compared to an elevated 15m vertical the endfed was comparable but much quieter. Never a problem and instant switching.
 


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