Navassa 5 Elements [ K7AGE ] – : Part 9

 

JK Navassa-5

2 Elements on 10M / 2 Element on 12M / 2 Elements on 15M / 2 Elements on 17M / 2 Elements on 20M / 12ft Boom

JK Antennas Navassa-5 Multi-Band Yagis interlace full-size 20, 17, 15, 12 and 10-meter elements on a single 12 ft. boom with a rugged 2 in. diameter. Named after the Navassa Island DXpedition, these antennas are based on a collaborative design effort by Daniel Horvat, E73M/N4EXA and JK Antennas.

JK’s unique design places full-size elements on a single boom and produces amazing 2-element mono-band performance on all 5 high bands! This results in producing good gain and great SWR bandwidth on all 5 bands. An optional 6-meter kit adds 2-more elements to make these antennas work on the 50 MHz Magic Band.


Mechanical details:

* Boom Length: 12 ft.
* Boom Diameter: 2.0 in.
* Wind Area: 8.97 Sq. ft.
* Maximum Wind Speed: 100 MPH
* Maximum Turning Radius: 19.45 ft.
* Longest Element: 36.8 ft.
* Element Construction: Stainless-steel through-bolts (no rivets or worm clamps)
* Mast size: Heavy duty U-Bolts supplied for 2 in. OD Masts
* Approximate Weight: 59 lbs.
* Power Handling: 5,000 watts (limited by balun selected)
* 1:1 Balun is required (not supplied)

These antennas have been designed to give the ham radio operator an excellent antenna for operation on all 5 high bands with automatic band switching and a single feed line. The short boom length was employed to keep the antenna compact and the installation simple. Navassa-5 antennas use direct 50-ohm coaxial feed with the all driven elements connected by a robust metal strap balanced transmission line. A high-quality 1:1 current balun is required. The COMTEK COM-BAL-11150DT is recommended for full power handling and best performance.

Like all JK Antennas, Navassa-5 beams are manufactured with high quality materials and hardware; like their larger low-band Yagis. A 1/4 in. (6mm) thick mast plate and all mounting hardware is included with these antennas.

When you think about working DX on the WARC and Classic High Bands using a high-performance Yagi, think about JK Antennas Navassa-5 Multi-Band Yagis.

10M 12M 15M 17M 20M Optional 6M
Active Elements 2 2 2 2 2 2
Gain at 65ft above ground 12.56 dbi 12.4 dbi 11.79 dbi 11.82 dbi 11.39 dbi 12.44 dbi
Gain in Freespace 7.0 dBi 6.8 dBi 6.24 dBi 6.36 dBi 6.2 dBi 6.65 dBi
Peak F/B 12 dB 12 dB 12 dB 12 dB 12 dB 16 dB
Peak F/R 12 dB 12 dB 12 dB 12 dB 12 dB 16 dB
2:1 SWR Bandwidth 800 Khz Less than 1.5:1 450KHz Less than 1.5:1 Less than 1.5:1 800 KHz
1.5:1 SWR Bandwidth 600 KHz 100 KHz 350 KHz 100KHz 350KHz 600 KHz
Max Element Length 18.7 ft 19.8 ft 24 ft 28.2 ft 36.8 ft 9.4 ft

** All pricing shown assumes the basic mounting hardware. Additional costs may apply for customized mast plates and hardware.

** Pricing shown above includes Mast Plate and mounting hardware

Price : US$1,285.00 **

 


20

Power Amplifier using 4CX10000D

Data of DRESSLER Katana-20K RF Linear Amplifier Frequency bands all HF amateur bands 1.8 MHz to 29.7 MHz Power supply 2 power supply transformers 12400 VA & 3 VA Plate voltage 7700 V at full output power Screen voltage 1200 V stabilized… Read more


20



Review

 

The post Navassa 5 Elements [ K7AGE ] – : Part 9 appeared first on QRZ NOW – Ham Radio News.

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