News

We must inform our customers that we will not send parcels during Christmas and New Year holidays. The last parcels were sent on 19 Dec 2017. The next date for dispatch will be on 3-d of Jan 2018. We wish … Continued

Hello to everybody, During Christmas holidays we have noticed increased delays in kits delivery. This is not a problem with Bulgarian post but an international issue due to overload. The post delivery time might reach more than a month! The … Continued

The new batch of the Active Antenna Amplifiers is avaialble in stock. The new board revision is marked as v.6.01. There are no differences in specifications compared to the previous batch and the model is AAA-1C. Every kit ordered after … Continued

The AAA-1 can be used to measure the field intensity. Calibrating the loop needs very specific measurement equipment which is an expensive or time consuming task. Fortunately the AAA-1 loop mode has very predictable antenna factor AF which can be … Continued

Two new papers are uploaded in LZ1AQ site. Models are used to evaluate the impact of external conducting objects on the radiation pattern of directive RX antennas. They might help the users to understand sometimes unexpected behavior of their RX … Continued

Important for VDL-1 users. We found out that VDL-1 might have a problem when model AAA-1C active antenna amplifiers are used with it. These models are using optocouplers in the relay control lines in order improve the isolation from strong … Continued

An important stage in VDL-1 array mounting are the ground connections and feeder baluns in order to achieve proper performance. The file is in http://active-antenna.eu/tech-docs/vdl-ground.pdf

New possibilities with AAA-1. The AAA-1 modes can be controlled now from a PC. It is convenient to have such an option e.g. if you have a remote station there must be way to switch the antenna modes via software. … Continued

There is a strong and fast fading on HF bands. When testing my phased array with small active antennas, the measured front-to-back (F/B) ratio is usually between 20 to 40 dB with local stable signal sources with vertical polarization. The … Continued

A new version of the software v.1.61 for VDL-1 control from PC is uploaded on this site. The installation is simplified and new “periodic switching” mode is added. The periodic switching can be used to test and estimate the antenna … Continued