Hi Stefan, LF
For the coil, I’m using the MF coil + variometer, and then adding two more coils to reach resonance
This links to a picture with inductance values
https://www.dropbox.com/s/tqzu5wxu3tfvnsv/MF%20and%20LF%20coils.jpg?dl=0
I’m using an Ultimate3 with DDS (The old version) running at 2 x frequency to feed the D-Class PA
EbNaut in LF is also in project. But I’m puzzled at how to modulate the carrier at LF. I’m not sure if the D-Class PA
would work for phase modulation. The driver is not a typical one, but a PWM controller SG3525A. It is a modified
“Ropex the First” which was designed as Xtal CW TX. So it will ruin any try to transmit with coherent signal, I’m afraid
L
Working also in a Class-E
PA. Whcih will be much easier to drive with coherent signals
73 de Luis
EA5DOM
Hello Luis,
Very well! Not a bad result for 30W :-)
Which L does your loading coil have?
2017-10-11 08:48:19 EA5DOM 1398km 137457.954Hz 163mHz -36.8dBOp 88% 20.7dB
2017-10-11 07:48:19 EA5DOM 1398km 137457.960Hz 106mHz -38.3dBOp 65% 17.5dB
2017-10-10 04:48:19 EA5DOM 1398km 137488.938Hz 177mHz -38.2dBOp 65% 19.0dB
2017-10-09 15:48:19 EA5DOM 1398km 137509.949Hz 174mHz -38.7dBOp 88% 20.6dB
Unfortunately my LF RX is overloaded by the local VLF transmissions (20m diatance between the antennas) but we can see that i can receive you beginning in the late afternoon until the morning :-)
How do you generate your frequency? Is it a coherent signal? Looks like the bandwidth is relatively high...
You could use one of the recent discussed NEO-7 GPS modules to generate the frequency directly. This would give you an ultra stable and precise carrier...
It would even work for EbNaut which is BTW a very good idea to try anyway :-)
73, Stefan
Am 11.10.2017 10:09, schrieb VIGILANT Luis Fernández:
Hi LF
I keep running Tx Op32 every hour at 30W to antenna
