| The OB8-4M is an extremely effective, compact and innovative Yagi for the classical four bands 40, 20, 15 and 10m. It is the first trapless Yagi for this frequency spectrum in the world with a single 50 Ohm coaxial feed and with two powerful Moxon Rectangles integrated in its design to improve performance. A mechanically brilliant power house without compromise, the next level of antenna performance! |
|
|
|
|
| OB8-4M | 8 Element, 4 Band | |
| Bands | 40 / 20 / 15 / 10 | |
| Gain (dBd) * | 3,5 / 4,2 / 4,4 / 4,9 | |
| Gain (dBi) ** | 10,7 / 11,4 / 11,6 / 12,1 | |
| F/B (dB) | 18 / 25 / 20 / 28 | |
| VSWR | ||
| 40 m allgemeines setting: | ||
| 7,00 – 7,05 – 7,10 – 7,30 | 1,6 – 1,15 – 1,3 – 1,9 | |
| 40 m USA phone setting: | ||
| 7,15 – 7,20 – 7,30 | 1,5 – 1,15 – 1,4 | |
| 14,00 – 14,18 – 14,35 | 1,5 – 1,1 – 1,4 | |
| 21,00 – 21,25 – 21,45 | 1,3 – 1,1 – 1,4 | |
| 28,00 – 28,50 – 29,00 | 1,6 – 1,15 – 1,7 | |
| Elements (number) | 8 | |
| Active Elements | 2 / 2 / 2-3 / 2-3 | |
| Max. Elementlength (m) | 10.52 | |
| Boomlength (m) | 6.1 | |
| Turning Radius (m) | 6.12 | |
| Feedlines (number) | 1 Coax 50 Ohm | |
| Weight (kg) | 50 | |
| Windload at 130 km/h | 970 N / 1,20 m² / 13,0 feet² | |
| Price *** | 2.219,00 EUR |
| * = average gain over dipol in free-space / for comparison: 2 el monobander 4 dBd, 3 el 5-6 dBd |
| ** = average gain at 20m above ground (= dBd + 2.15 dB isotropic + about 5 dB ground reflection) |
| *** = outside EU minus 19% tax – subject to change |
The Yasme Foundation has released two chronicles of amateur radio DX history that make for compelling reading — a downloadable edition ofYasme: The Da... Read more
The long-awaited inaugural Youth on the Air (YOTA) camp for young amateur radio operators in North, Central, and South America will go forward this Ju... Read more
Lets take a look at the Belka-DX a tiny shortwave receiver. Read more
The Caribbean Emergency and Weather Net (CEWN) has been providing round-the-clock coverage during the La Soufriere volcanic eruption on the island of... Read more
News
Yasme Foundation Releases Chronicles of Amateur Radio DX History
Camp for Young Radio Amateurs in the Americas is a Go for this Summer
Belka DX Shortwave Receiver – Closeest Thing To A Spy Radio?
Clear Frequencies Requested for Net Providing 24/7 Coverage of St Vincent Volcanic Eruption
Today i’m bringing you an update on a very exciting qrp ham radio from Lab599. It’s called the Discovery TX-500. The TX500 is a HF & 6... Read more
Auto Ant Tuner with 2000 Memories Pkgd For IC-705 The Package is IC-705 Ready and Includes The Following: 8 Heavy Duty AA Batteries Icom IC-705 I... Read more
JH1CBX Masaco introduces AH-705 designed for IC-705. Descriptions ・Covers the 1.8 MHz to 50 MHz bands 30 m, 98.4 ft or longer antenna: 1.8 – 54 MHz, 7... Read more
“Antenna tuners are a vital, yet slightly misunderstood ham radio station accessory. In this video we talk about what an antenna tuner does and... Read more
Equipment
Lab599 Discovery TX-500
LDG Z-100PLUS/IC-705
Introduction for Icom AH-705 Automatic Antenna Tuner
How to use a manual antenna tuner – Ham Radio Q&A
The ARRL Foundation Board of Directors has selected Ellwood “Woody” Brem, K3YV, of Spring Mills, Pennsylvania, as the winner of the 2020 Bill Orr, W6S... Read more
“In this video is almost all the Rigexpert antenna analyzers, thanks to GigaParts.com for letting me borrow them all. I will be making some vide... Read more
“My good friend Joel, KC4WZB, loaned me his brand new Yaesu FTdx10. When I say loaned, I mean he picked it up at Ham Radio Outlet and brought it... Read more
In today’s video, we’ll be sharing a live unboxing of the AnyTone AT-D878UVII Plus as well as a product demo. VHF/UHF DUAL BAND: Feat... Read more
Review
Woody Brem, K3YV, is the 2020 Bill Orr, W6SAI, Technical Writing Award Winner
Rigexpert Antenna Analyzers Comparison, Choosing The Right Analyzer For Your Ham Radio Antenna
FTdx10 & IC-7300 Weak CW Signal RX Comparison
AnyTone AT-D878UVII Plus Unboxing and Demo
In today’s video, we’ll be sharing a live unboxing of the AnyTone AT-D878UVII Plus as well as a product demo. VHF/UHF DUAL BAND: Feat... Read more
Brand new from Wouxun is the KG-UV8H Handheld, which features a different screen than earlier models, an 8-watt output power, and a 3200mAH battery. L... Read more
Pending future FCC action, amateur radio secondary use of the 3.3 – 3.45 GHz band segment may continue indefinitely. The FCC, as part of a lengthy... Read more
“For years the Baofeng UV-5R has been maligned as non-compliant with FCC regulations and a real spreader of spurious emissions. Further, it woul... Read more
VHF
AnyTone AT-D878UVII Plus Unboxing and Demo
Wouxun REVEALS the KG-UV8H Dual Band 8-watt HT Radio
Amateur Radio Gets a Partial Reprieve on 3.5 GHz
Dump the UV-5R and Get the GT-5R
