Archivi

NDB: photo of ZRA antenna

During last holidays in Croatia I made a photo about a Marconi-T antenna in the village of Kakma, here the photo:

The antenna consists of a pair of towers about 20 meters high with a 2 wires Marconi-T antenna. Under the vertical wires is there a little house where the transmitter is […]

MF TX season started!

Last night I’ve been transmitting for the first time after the summer period. A new look to the the TX antenna was made to simplify the shape and get more gain. Now the hat is about 16 meters long and the vertical side is about 9 meters high.

The 6 wires of vertical slope are […]

First reception on 8270 Hz

Finally, thanks to Stefan DK7FC, I’ve my first “human” signal on 8 kHz band. Stefan was active for all the last week-end on the band to give me a chance to receive his signal, and pixel after pixel the signal apeared in this way: A well marked peak exactly on 8270.005 Hz shows the integration […]

Almost ready for VLF again

Ready again to receive VLF with my new loop. At the moment the antenna is located on the roof under the TX antenna for MF-LF.

The preamplifier circuit comes from the easyloop of VLF.IT with an OP27 and few others components.

The antenna is composed by 32 turns of 0.15 […]

630m pirate?

Tonight I’ve decided to try QRSS on MF and while I was transmitting I’ve seen on DK7FC grabbers a strange signal between mine and IK1HGI’s. The call was C7MW which prefix is allocated to the World Meteorological Organization. With Stefan’s RDF spectrogram is possible to see on the next picture that signal comes from E/W direction.

Any […]

My first TA MF!

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km mi 2016-09-27 02:40 IK0VVE 0.475692 -29 0 JN61km 0.05 WD2XSH/17 FN42pb 6626 4117 […]

Increasing TX antenna capacitance

This is my umpteenth upgrade to the TX antenna to try to get better general performance and get the possibility to work on 136 kHz without tons of electrical wires outside the terrace. The new layout is drawn in the next basic picture: I’ve passed from 4 top wire and a single vertical […]

A little upgrade to the 630m TX antenna

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 […]

The 630m antenna

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 […]

Again on the air with WSPR 630m

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 […]