One of my HAM fellows has build a new 2kW HF amplifier. Together with his SDR ANAN-100 he gets really impressive IM3 values.
This inspires me also to do some measurements on my existing HF transceivers - K3 & KX3. For this I needed a two-tone generator.
My proof-of-concept works pretty stable - please check the status screen:
Here I've build an audio CW-filter based on the circuit from NM0S/4SQRP.
Inspired from the work of EA4TX and K3NG I decided to check, whether the ESP8266 based NodeMCU 1.0 (ESP-12E) is usable as a simple remote IP-based rotator control. You can get the NodeMCU in a decent quality on eBay.
Idea was, to link a local emulated serial port to the NodeMCU module. The HAM Radio applications are communicating via the standard Yaesu GS232A protocol with the emulated serial port. This emulated serial port then forwards the serial requests to the NodeMCU.
As you can see in this post, I've used a simple slide switch to control the power for the sensor keyer. This was a little bit annoying, as you must always check, whether you've turned of the power, when you leave the shack.
As power consumption is not really a big issue - the keyer draws about 2.5mA from two AA-cells. Based on the capacity of an average Energizer Classic AA battery of 1.200mA you will get an on-time of about 300h.
Since many months I've had the idea, to add an electronic switch to the keyer, so it switch of automatically after 15 minutes of idle time.
Some weeks ago I've build a full-featured XPhase for my father, DK1UO. He is sometimes affected by heavy interference from Plasma-TVs or similar scrap
The function of the XPhase is based on the fact that the interfering signal, received by an auxiliary antenna, is added phase-shifted to the signal received from the main antenna. When the phase-shift is more or less 180°, the interfering signal is canceled out.
Saving parameter to EEPROM
I've discovered, that the value of the weighting feature is not saved to the EEPROM. I'Ve updated the Sketch.
All my changes in the sketch are surrounded with a conditional statement:#ifdef DL2SBA...#endif
and should be discovered easily.
Nachdem ich mit Olivers Powermeter meine ersten Schritte in Richtung Shack-Automation unternommen habe, habe ich ein bischen weitergebaut …