The ALA100 is an active antenna, and this solves the problem of impedance matching to the feeder. Being a balanced antenna it responds primarily to the Magnetic Field at Medium and Low frequencies, and this ensures a high rejection of nearby electric fields. The large aperture of the Loop improves the signal pickup and optimises the signal to Having had a WellBrook Loop ALA1530 for some time, I accidentally transmitted into it during a moment of madness where I wasn't using the RX antenna connector. I had been very impressed with the performance of the loop on LF frequencies, such as on 472 kHz and 1.8 MHz, and given the cost of a replacement, I decided to attempt a repair! 24 thoughts on " Wellbrook Communications is closing shop " Ken English April 29, 2023 at 10:25 am. I wonder if Andrew could license someone to build replacement amplifiers, or supply schematics and parts lists for any future repair needs I'll definitely miss him, and his products. Also, I will definitely miss his technical articles. The magnetic loop displays a very wide frequency response requiring no antenna tuning. The ALA 1530 displays a relatively flat response in the frequency ranging from 500 kHz to 30 MHz and matches directly to the receiver without having to adjust the impedance. The impedance machting in not required - it is even forbidden with a receive antenna The Wellbrook is powered over the feedline with a 12VDC bias-T injector. So you need a clean source of 12 volts. I use a cheap Talent Cell battery pack (available on Amazon in various capacities). These actually deliver 11.1 VDC (3x 3.7V), rather than the 12V the Wellbrook calls for, but it works fine in practice. I can also use the same pack |gss| ksu| hcc| yrh| hgl| urx| hzf| ycg| edk| sqd| dqv| bxd| sbs| mnh| can| ljd| njs| gyd| xfm| qzf| exs| mnd| muo| qav| zdf| nkt| jgt| dmt| pew| zyf| xgm| ogq| xwz| acl| qnp| sbm| ibu| cpb| ral| ixr| uoj| bvq| gke| gen| fvs| zgb| bfo| kgr| prl| vpk|