Wandering on the Internet I found an interesting LZ1AQ kit about a broadband antenna amplifier for small antennas.
I immediately felt that it was a great product also saw the multitude of schemes and research carried out by Chevdar.
I then bought a kit AAA and started with the construction of the antenna.
These pages show how I adapted a AAA to my situation, for more details on the theory and the operation I invite you to visit http://www.lz1aq.signacor.com/.
To build the two loops I used a multilayer tube for heating installations diam. 16mm, I took 10 meters of pipe and I divided it into four equal parts in order to have 4 loops of less than a meter in diameter.
The loops are parallel two by two by means of the wires of the same length as they exit from the amplifier board.
The wooden pole is about 2 meters long and was stained with protective paint.
I am currently finishing the control box that contains the control board for the remote amplifier.
Today I did some tests with loop antenna into my station radio and I must admit that I was impressed from these first tests.
I will soon publish the progress of the operations until the installation
on the roof of the house.
Here follow some photos about the remote control box where I can choose the antenna modes.
The next step will consist to connect the control board to the PC so to select via software the antenna mode.
Loop on the roof
The loop at the moment is over the solar panel for the hot water, but I would move it higher and far from metallic masses even if antenna loop mode function shouldn’t be influenced by them.
The last image shown the loop on 160 meter band during the last CQ WW CW Contest.
Back side with RJ45 plug for control cable and BNC output
Front panel, ON-OFF and selection
CQ WW CW Contest 160m
From some time I am participating in the development of the Radio Club Ripoli remote station situated near Rome.
On this blog I will briefly describe some of the steps that I personally defined and which have been applied for the remote control of the radio station.
First of all the website of Radio Club Ripoli, for those who understand Italian language there are already a lot of information about the point where we got these days.
Currently the radio station is composed of a Kenwood TS590s, a power amplifier OM Power 3500A, two full size dipoles 80 and 160 @ 45 meters, a dipole AntennaDinamica 6-40 meters @ 20 meters.
The position of the towers is about 550 meters asl, with a really enviable take off angle.
An antennas array RX only, the DXE-RCA8B-SYS-4P by DX Engineering, is undergoing final installation.
The heart of the system is the AD Controller software that connects the various parts of software and hardware to synchronize frequencies and modes of transmission between radio and antennas.
First of all to make it easier and more user-friendly the option to change the radio frequency to remote radio I developed a small application that allows the use of OmniRig via Ethernet. In this way you can double the VFO on your radio at home, whatever model it is, with the remoted radio.
QSYing become more easy and natural than with Kenwood PC software, where you are obliged to use the mouse to any operation, even the simplest.
We can also connect locally or remotely a logger program, in that way We can take advantage of, for example, the cluster client of our favorite log program directly from home, where clicking on a spot on the home PC We will directly tune the remote radio on the frequency of the DX station.
Thanks to AD Controller, antenna selection and rotator direction will be automated, too.
At the moment this software (OR2LOG) is in test mode but its use brings many benefits to the ease of use of the system.
Next time I’ll talk about the DXE-RCA8B-SYS-4P remote control.
Added an old antenna project about an 8 elements quagi antenna.
Da circa un anno e mezzo utilizzo per distribuire la rete Internet/Intranet in tutta casa tramite LAN e WiFi un economico router della Asus, il modello RT-N14U.
Nella sua semplicità è veramente versatile e attualmente lo uso con i vari port forwarding per mettere in rete alcune cosette tipo SDR-Online, condivisione HD su Cloud, audio e video streaming, VPN, ecc…
Dopo qualche mese di utilizzo ho notato che le prestazioni non erano più buone come i primi giorni, specialmente in ambito WiFi le periferiche connesse a questa rete soffrivano di un trasferimento dati lentissimo, facevo prima a trasferire tramite chiavetta alcuni grandi file. Facendo alcuni test ho provato a togliere i vari port forwarding, l’HD, spegnere il WiFi di cellulare e tablet, ricaricare il firmware,… dopo mille prove e non trovando niente in rete ho pensato che il problema dipendesse da un generale sovraccarico di risorse.
Tanto va che non ho più utilizzato il wireless collegando quasi tutto solo in Ethernet.
Dopo qualche tempo e ricerca sul Web mi sono imbattuto nel lavoro fatto dal russo Andy Padavan, in breve si tratta di un firmware (veramente di vari firmware fatti ad hoc per vari modelli) installabile nel mio router in maniera pressoché indolore.
Il bello di questo firmware è che non richiede alcuna modifica hardware e inoltre è sempre possibile tornare al firmware originale semplicemente facendo un nuovo upload dal sito Asus.
Dopo aver lanciato l’aggiornamento al nuovo firmware, è bastato scaricare il file zippato sul PC dalla cartella downloads e poi caricarlo sul router da pagina apposita, e passati alcuni minuti di apprensione, la paura di dover andare a comprare un altro router era completamente scomparsa: il mio router era completamente rinato!
La connessione WiFi è tornata ai fasti di una volta e anche meglio nonostante avessi riconfigurato tutte le impostazioni come in precedenza (HD, port forwarding, ecc…). Con pochi Euro è possibile avere un veloce ed affidabile NAS, un client torrent Transmission con interfaccia web (quindi raggiungibile ovunque), un download manager, server o client VPN, server DLNA per smart TV e molto altro. E se poi qualcuno volesse smanettare per personalizzare il firmware il sorgente è disponibile sul sito.
La prossima modifica sarà hardware e consisterà nel modificare le antenne interne per il WiFi che hanno performance veramente basse.
Buon up-grade a tutti e buon 2016!
Last night I powered my old 30 meter DFCW QRSS3 MEPT.
It is strange to see how 400mW can reach Tasmania:
Some grabbers from USA have a weak trace of my signal but it’s not readable, this mean that my 400mW signal is crossing all continents concurrently! WOW!
In the next days I’ll try to build a 30 meters dipole to use it only for this TX. At the moment I’m using a 10 meters high vertical antenna, so I would see what change using horizontal polarization. Another test could be to change antenna (and polarization) any 10 or 15 minutes automatically.
I’ve abandoned my web site for long time because of few free time . I decided to install a WordPress blog over my web server to simplify its management.
Some news have heen added, something comes from other site (the source of the link is always viewable), some is from my old web site and some, I hope, will be new!
Here is my result for the 2015 CQ WPX Contest. 80 meters QRP is really hard to do with minimalist vertical antenna.
I achieved something beyond my expectations.
See you in the CQ WW CW at the end of November.
I’ve decided to write some notes about my (little) condo experience in the MF world because many people think that We need a lot of space to work these frequencies.
Today I’ll write about my TX antenna. It’s a classic inverted L, it’s only 9 meters high and it has an 11 meter long single wire hat.
The position is really not elevated, the base is about only 2 meters from my terrace.
To get better performances I’ve put the loads the higher that was possible.
Starting from the base, where there is the variometer, the wire of antenna goes up for about 5 meters, then came back down for other 2,5 meters, then goes up again rolling up around the main fishing pole. At this point there is a 15 cm 3 layers coil, not so good for getting best performance, but…
The wire continues toward the tip of the rod where it’ll become the horizontal hat for other 11 meters about. I’ve only one random radial, 15 meter long about, and a connection to the ground.
This ground connection gives me a lot of noise making reception almost impossible. Without this ground connection the antenna is a very quiet antenna for receiving, too.
Transmission power without grounding worsens drastically.
The variometer is remote controlled by a stepper, but about this I’ll speak later. P.S.: sorry for my english… HI
Ho scritto per DXCoffe un articolo su come poter catalogare automaticamente le QSL.
Ecco il link: ARTICOLO