| 4 big monobanders on 1 boom, no traps !!! |
|
OptiBeam
| OB17-4 | 17 Element, 4 Band | |
| Bands | 40 / 20 / 15 / 10 | |
| Gain (dBd) * | 4,8 / 7,3 / 7,8 / 8,0 | |
| Gain (dBi) ** | 11,7 / 14,9 / 15,5 / 15,8 | |
| F/B (dB) | 25 / 20 / 22 / 24 | |
| VSWR | ||
| 40 m allgemeines setting: | ||
| 7,00 – 7,05 – 7,15 | 1,7 – 1,1 – 1,9 | |
| 40 m USA phone setting: | ||
| 7,15 – 7,20 – 7,30 | 1,7 – 1,1 – 1,8 | |
| 14,00 – 14,18 – 14,35 | 1,4 – 1,1 – 1,3 | |
| 21,00 – 21,27 – 21,45 | 1,5 – 1,1 – 1,5 | |
| 28,00 – 28,59 – 29,00 | 1,5 – 1,1 – 1,4 | |
| Elements (number) | 17 | |
| Active Elements | 3 / 4 / 4 / 6 | |
| Max. Elementlength (m) | 14.6 | |
| Boomlength (m) | 11.9 | |
| Turning Radius (m) | 9.15 | |
| Feedlines (number) | 1 Coax 50 Ohm | |
| Weight (kg) | 100 | |
| Windload at 130 km/h | 1.989 N / 2,48 m² / 26,8 feet² | |
| Price *** | 3.869,00 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 | |
Cycle 25 sunspots persisted for the first two days (January 9-10) of this reporting week, January 9-15, with daily sunspot numbers of 14 and 11. That... Read more
The Alexanderson alternator 2019 Christmas Eve transmission on 17.2 kHz from SAQ in Grimeton, Sweden, was heard by more than 400 listeners. SAQ report... Read more
The Lagunaria DX Group is planning a “large-scale DXpedition” to Timor-Leste (4W) in the October/November 2020 timeframe. “We currently have one team... Read more
Also read This Common-Mode Chokes by Chuck Counselman, W1HIS is well worth reading. Read more
The Belka-DSP radio receiver is designed to receive radio stations with amplitude, frequency and single-band modulation, as well as telegraph signals... Read more
Delta loop Antenna Boom length: about 7m, projection on the ground 4m per arm Mounts on mast from 40 to 50mm, 60mm optional. suggested height at least... Read more
The 17th International Amateur Radio Union (IARU) High Speed Telegraphy (HST) World Championship will take place August 20 – 24 in Ulaanbaatar, Mongol... Read more
ARRL’s newest podcast! The first issue of On the Air magazine has been released and Becky Schoenfeld, W1BXY, provides an overview of what’... Read more
Recent Posts
The K7RA Solar Update
SAQ Alexanderson Alternator 2019 Christmas Eve Transmission Heard by More than 400 Listeners
Large-Scale DXpedition to Timor-Leste Planned for this Fall
Noise reduction in your shack – RFI
Belka-DSP radio receive
Solid Delta loop for 20m band
High Speed Telegraphy Competitions Set
ARRL’s newest podcast!
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Foptibeam-ob17-4%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
