New experiment ongoing tonight :-) Just the 10,25m vertical with one vertical radial about 11m long hanging down A vertical dipole, really No coil, no adaptation. Have used this with the bare U3 and
Hi Luis, My congrats!!! This is a very good result for an unloaded 10m vertical antenna! The coil will make a big difference, a few 10 dB i expect, although this is hard to imagine since your reports
Thank you Stefan :-) This is being posible with the help of many friends found here in the reflector, like you This morning I have added the loop to the ground side of the vertical (dipole). No diffe
Hi Luis, Be careful with running a mismatched PA. It may not blow up the FETs but maybe a C in the output filter. And the filter will not work very well too. I guess you know how to match the antenna
Hi Stefan Yes. I have already doubled the voltage rate of the output filter. It was the second thing that failed when transmitting with the loop. Output ferrite transformer is also cooled with fan an
Hi Luis, Am 18.10.2015 00:49, schrieb VIGILANT Luis Fernández: Hi Stefan Yes. I have already doubled the voltage rate of the output filter. It was the second thing that failed when transmittin
Hi Stefan The PA uses one between FET and output filter. Actually the vertical is directly connected to the PA output. No matching transformer and no loading coil. It was a crazy test but works .....
Hi Luis, Am 18.10.2015 21:59, schrieb VIGILANT Luis Fernández: For the transformer I plan to recycle the one osed for the loop. It has two big toroids 80mm external diameter and 8mm thick. Bot
Hi Stefan This is a picture of the coil 25cm diameter pipe, 90 cm high https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00571.jpg I can also fit this variometer on the top side of the
Hi Luis, have you an idea about the Q of this coil? A 11m vertical without a capacitance hat need a coil of about 1.7 mH for resonate at 472 KHz, so a reactance of about 5 Kohm. If you divide the rea
Hi Luis, Nice looking coil. It has a good ratio between diameter and length although it would have been better to have a small gap between the wire turns. And i didn't expect that you need so much L.
Hi Fausto, Stefan, MF That's what I need. Discussion and brain storming ! :-) Yes. The coil has too many wounds and should be about 3.9mH It is the first time I ty to make such a thing so I used all
Hi Luis, Lol. Yes, maybe an antenna analyzer helps to understand things. For the coil i would use isolated mains electric wire. We have 1.5mm^2 and 2.5mm^2 here in DL. Also there is 0.75mm^2 for some
Hi Stefan, MF Sunshine again here (standard weather ON) :-) The vertical antenna is an Ultrabeam, SteppIR like. So it is a glass fiber wip with the electric conductor inside In order to get top capac
Hi Luis, Am 22.10.2015 10:37, schrieb VIGILANT Luis Fernández: Will get the 1.5mm^2 What is available here is multi wire (litz ??) single wire is no longer in the market, so they said. Is it r
