Description
| PENTA10 1012151720 Bands | 10 m | 12 m | 15 m | 17 m | 20 m |
|---|---|---|---|---|---|
| Gain dBi: (at 20m from the ground) |
12.3 | 12.5 | 11.50 | 11.60 | 12.00 |
| Gain dBd free space: | 4.9 | 4.7 | 4.0 | 4.1 | 4.5 |
| F/B: | 25 | 15 | 15 | 15 | 15 |
| Active elements: | 2 | 2 | 2 | 2 | 2 |
| Bandwidth kHz SWR ≤ 1.5:1 |
700 | 100 | 450 | 100 | 350 |
| Boom length: | 390 cm/12.80 ft | ||||
| Turning radius: | 590 cm/19.35 ft | ||||
| Feed line: | 1 x 50 Ohm | ||||
| Max tower lift/ side mount: | 50 cm/1.64 ft | ||||
Max element length:
1100 cm/36 ft
Power handling:
10 KW
Wind area:
0.795 m²/8.6 sq ft
Wind load 130Km/h:
635 N
Wind survival*:
130 Kmh – 80 MPH
Tower Leg/Mast diameter: 40/60 mm – 1.57/2.36 inch (larger on request – specify on order form)
RF Choke:
3 KW rated included
Weight (excluding packaging):
27 Kg/60 lb
materials USED
Tubes and plates:
aluminum alloy, 6060T6
Hardware:
stainless steel
Insulating clamps:
UV resistant polypropylene
Manual: English
*Wind survival is the maximum wind speed at which there is no permanent deformation of the antenna (calculated in the absence of ice)
Mark Pride –
PENTA10
I will tell you, I have built many antennas in my life, some very difficult and some simple with very few elements.
I have never had an opportunity to build something like the Penta 10 from Momobeam and all I can say is “Phenomenal”
When taking out the parts from the single box, I found nothing but high quality parts and high end workmanship.
Every component was marked properly and every hole in the aluminum components drilled perfectly.
I will say I have never put together a significant HF antenna when a tape measure was not required.
Believe it or not, I never had to measure anything with this installation, all parts were pre-drilled and marked precisely.
The boom-to-mast plate was more than adequate and the square boom stock, element mounting was easy.
Square Boom stock is fantastic as all elements mounted on the boom are always perfectly level. Further, the boom-to-mast mounting is also perfect because of this.
The elements are insulated from the boom, which guarantees the antennas impedance will not change due to corrosion with electrical contact with the boom. The element-to-boom mounting design was superb and the POM-C UV element clamps are very well designed and work perfectly. Further they hang below the boom, so these center sections are not pointing upward to the sun forcing excessive UV exposure.
The element tubes are drilled in such a way as they literally pinch the smaller tube inside the larger tube making a superb mechanical and electrical connection.
So when finished, I was pleased as everything went together perfectly but then again, everything is pre-drilled.
If I needed to make any element adjustments, it would be very difficult especially if anything had to be shortened or lengthened. Not required as discovered during testing.
When I mounted the phasing sections which attach to the driven elements, I found the elements needed some very small spacing tweeks.
The phasing hardware has no play and the element spacing must be exact (inside a 1/4 inch) in order to attach the phasing lines with the pre-drilled aluminum driven element sections. This took a little time to get things exact. I think if I installed another I would not tighten these driven elements until after the phasing lines were attached.
Finally, the included balun was of high quality with ring eyelets to connect to the phasing rails and an SO-239 on the other end to attach to the feed line (Coax).
Now that the Penta 10 was built I needed to examine the antenna on each band with an antenna analyzer. I was worried as adjusting this beast would be difficult.
To my utter surprise, this is what we found on each band:
10 Meter Band: Under 1.3 : 1 from 27.400 to 30.00 MHz
12 Meter Band: Under 1.5 : 1 from 24.500 to 25.00 MHz
15 Meter Band: Under 1.2 : 1 from 21.00 to 22.0 MHz
17 Meter Band: 1:1 : 1 from 18.000 to 18.200 MHz
20 Meter Band: 1.1 : 1 from 13.400 to 14.500 MHz
No need to adjust anything. No ruler or tape measure needed. Worked perfectly as built the first time.
On a scale of 1 to 10, 1 being poor 10 being top notch I would give this manufacturer an 11.
Three new countries were obtained within 45 minutes of use on FT8 20 Meters after the installation. I am very pleased with the look, the build and the performance of this Momobeam Penta 10 Five band antenna.
The gang at Momobeam should be very proud of their work. It is stellar.
Steve Gilmore | W4SHG