I don’t use this cheap handheld often, on the contrary, I rarely use it. Anyway, I prepared it for the holiday trip, to hear some local Hams and have FM chat. Once I got there I turned on the small radio and with great surprise I could not hook up any repeater, even the FM […]
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Dopo alcuni anni passati a giocare con molta soddisfazione fra le MF e le LF, trasmettendo con una L invertita alta circa 10 metri e lunga 16, composta da sei fili paralleli, ho deciso che la mia nuova radio, una fiammante FT991A, sarebbe stato più utile e divertente utilizzarla su tutte le bande. […] After about a month and a half from the beginning of the meteor scatter project with a satisfactory success, we wanted to make a small improvement to the reception system by doubling the antenna. From the beginning the antenna was a four element 1.5 lambda boom length with a gain of about 8.5 dbd. We […] 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 […] 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 […] Last night was my second “serious” TX test on 136 kHz, transmitted Opera32 mode after an upgrade to the matcher. To tune the antenna on 136 kHz I’ve build a couple of inductors over two hand cleaner soap bins. The first one was wound with enameled copper wire of about 1 […] 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 […] Since my antenna was born as monoband for 630 meters, until today I’ve used an autotransformer built around the variometer. In these days I’ve tried to tune the antenna on 136 kHz, beginning to put some mH over mH to reach my goal. Arrived to 136 kHz I’ve sadly found that the autotrafo […] 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 […] 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 […] |
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