Just arrived (10 days from Japan) I’ve worked for a couple of hours to assemble the U3S Deluxe kit from QRP Labs, later I wanted to try the GPS receiver for my LF activity by Spectrum Lab, so I made the smoke test giving 5 volts to the GPS receiver.
After a while all LEDs were working and Spectrum Lab was disciplining my audio board.
The GPS receiver was positioned inside my lab room, close to the window, it was capable to find 7 or 8 satellites.
1pps and Data Out has been connected to the input of sound card of my laptop and finally I saw a perfectly synchronized system.
An now it’s time to try the rest of the kit after winding the LPF.
Here is the U3S without the LPF:
Inserisco questi file PDF dell’amico Mimmo in merito al setup delle porte virtuali su PC tramite VSPE, utile per chi ha radio SDR e molti software da far girare insieme con i dati CAT della radio.
To make a clean sweep of spagetti wires on the bottom of the antenna, to make my XYL happier, i tought to use the aluminium strip for the first section of the TX antenna.
After removed copper wires I connected the variometer to an old 4 el triband yagi for HF aluminium boom by a piece of strip taking care to pass as far as possible from the reinforced concrete column.
Then, on the top of the aluminium tube, another strip of 2 meter or so long to connect the vertical pole (the “antenna“…) located on the roof.
Two insulators are ready to be mounted between the brackets in the wall and the aluminium tube so to try to improve the insulation for the high tension present in this zone.
This improvement, of course, lowered the antenna resonance and changed the impedence of the system.
It seems now that the current has risen by 1/8 compared to before.
- UPDATE 28th April 2016 … :
Because of strong noise at home, in these nights I’m receiving MF signals from Monte Ripoli remote station. There the noise is very low and I can dispose of good performance antennas, not MF/LF dedicated for the moment.
Here is a screenshot of my signal (on the left) while just some minute before (00:18) the signal from DH5RAE was captured.
I should correct the drift of my transverter… a must to do soon.
My signal is always about the same, reaching always 7 or 8 dB. The aerial distance is about 50 Km.
The audio at 474 KHz of BIA NDB is very strong and also IQ2MI is very clear audible.
In the last weeks I’ve tested a new antenna for 630m band. To have also something usefull for 2200m I’ve built an helical loaded vertical antenna followed by a 3-wires hat, so to have a longer radiator that resonate about on 350 KHz.
The coil was about a 45 meter long 3 cm aluminium tape with a thickness of 0.3 mm. It was distributed along a 10 meter high fiber pole (used for my old 80m inv-L antenna).
After windings all the turns I’ve fixed the vertical “python” in the final position and tried to stretch the hat wires… after some seconds I heard “crackkkk”… one of the tubes cracked for the strong flexure.
So, the antenna down again, tube repaired with resin-soaked bandage but now I’ve used a second telescopic tube to support the hat.
Very good! To tune the antenna on 475 KHz I’ve inserted a 1200 pF variable vacuum capacitor, it was too long. Tried the antenna for a few days, as long as a in a weak windy day I made this photo:
There was something strange, the twists were too close and the bending was too evident! Again the antenna down on the roof. One of the inner poles was broken!
So why don’t use the telescopic pole as new antenna? It’s a 10m high pole, and I don’t need of the big coil for 630m. So I’ve decided to use the steel pole and with the only variometer I found the perfect tune on the 630m band!
Here it is: …and here the full 10 meter long hat.
The next step will be to fatten the vertical pole to increase performance and probably to strengthen the ties.
So if you at the moment hear my signal it comes out from this thing, an inv-L 10×10 meters about.
Tonight was the second night for my new 630 meter antenna test.
Thanks to the increase of Lowfers fellows I’ve had the possibility to have more receivers that last year.
I’ve been listened by about 40 different stations in more than a dozen of European country.
This image is relative to the night between 7th and 8th of April.
My new personal “record” for DX has been reached with the over 2000 KM of LA8AV.
The power is less than 60 Watts. Some photos of the new antenna arrangement will be posted here soon.
On 630 meter band page a new video about the renewed remote variometer.
Rik ON7YD created a new web site concerning 630 meter band, http://www.472khz.org/.
I invite you to take a look to this interesting source of informations for all whom are looking for “how and why” about this band.
I’m testing a simple SDR receiver as a WebSDR based on PA3FWM software. The receiver I’ve used for is a simple monoband Softrock for 20 meter band while for the audio the internal PC audio board at 96 KHz is used, the antenna at the moment is the wide band miniloop. IK0VVE WebSDR Online
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