| 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 |
WRTC Organizing Committee is proud to announce a 2023 edition of WRTC 2023 AWARD! This is NOT WRTC 2022 Contest that will be held in Bologna in July 2... Read more
Dayton Hamvention® 2023 is just over 6 months away, and next year’s Hamvention team has selected “Innovation!” as the event theme. T... Read more
Keep track of your important dates, ARRL contests, and holidays with a 2023 ARRL Calendar. This year’s calendar features Collegiate Amateur Radi... Read more
The Secret Government Radio Signals Read more
News
WRTC 2023 AWARD : January 2023…headset on!
Dayton Hamvention Announces Theme for 2023
The 2023 ARRL Calendar
The Secret Government Radio Signals I Heard Today!
Would you like a wireless mic option for your ICOM radios? Well, there is a way to do it with a Uniden CB mic. And it’s kind of neat! Read more
The ACOM 2020S is a state-of-the art 1500 W heavy-duty, solid-state linear amplifier, covering all amateur bands from 1.8 to 54 MHz. It features a Rem... Read more
Aaronia presents the SPECTRAN® V6 X: the world’s first and only 8 GHz USB spectrum analyzer with dual USB true I/Q streaming of up to 245 MHz (v... Read more
Effective October 1st 2022 WiMo Antennen und Elektronik GmbH (WiMo) will be the exclusive distributor for the complete 4O3A product family, including... Read more
Equipment
Using A Uniden Wireless Mic For ICOM Radios??
ACOM 2020S | Solid-State 1.8-54 MHz Linear Amplifier
SPECTRAN V6 X
WiMo Antennen und Elektronik GmbH (WiMo) will be the exclusive distributor for the complete 4O3A product
HF SDR Transceiver 10W Amateur Radio AM FM CW SSB FX-4C Read more
Check out this custom solution for Ralph’s Icom IC-705 Read more
I’m breaking it down this time, One of the all time most asked questions I get, Should you buy the Icom or the Yaesu? Do looks matter? Read more
Mount Your Mobile Ham Radio Antenna The Right Way Read more
Review
What secrets is it hiding? FX-4C
Icom IC-705 Custom Made Portable Go-Case, by Ralph. QRP Day In Vero Beach!
Icom IC7300 vs Yaesu FT991a
Mount Your Mobile Ham Radio Antenna The Right Way
How hard is it to make contacts over the ISS Crossband repeater? Thanks to Robert W5ITR https://www.qrz.com/db/W5ITR for demonstrating his very nice r... Read more
Here we take a look at the ABBREE AR-F8 handheld transceiver. Does this really do 20 Watts? I think we know that answer already..! Read more
The IC-905 Debut! Ham Expo Walkthrough Aim higher and enter the world of SHF. The IC-905 is an industry-first all-mode transceiver with 144/440/1... Read more
We’re back at the park to test the most expensive ham radio handheld radios available today. Which radio will have the strongest transmit signal... Read more
VHF
ISS Crossband Repeater Ham Radio Contacts!
ABBREE AR-F8 6 BAND HANDHELD
The IC-905 Debut! Ham Expo Walkthrough
Most Expensive Handhelds TESTED!
