Pa for the Minima Transceiver  QRP Pa 2008

I make a decision to by this kit instead for doing the RF386 pa for Minima. After build, I put the transistor on a sheet  of aluminum. Adjust bias and start test.

Power in +10dBm.  Vin = 13,5 V.

Frequency       Power                Current

3,5 MHz             12W                    1,53A  

7,1 MHz             13,2W                1,57A

14,2 MHz          13,2W                1,43A

21,2 MHz          8,5W                   1,31A

28,5 MHz          7,9 W                  1,27A

I bye the kit here.

Excellent Measurements. Here by IN3OTD.

Si5351

Si5351

I lock so much at info about this module so i order one from Adafruit.

Breakout Board

After that I came over this really inspired, QRP homebuilding transceiver from qrparci, presented in Januari number, and here . So I play around with it, couldn’t get the code to compile so I change to the AdafruitRSGBLcd display I have. The performance locks ok for QRP, lots of info here   NT7S .

8 kHz – 160 MHz , I measure around -2 dBm out @ 50ohm on f0.

I really like VFO + BFO on this small board. I will try it in one of my project later on.

TFT Display 2.4”

#include "SPI.h"

#include "Adafruit_GFX.h"

#include "Adafruit_ILI9340.h"

ADS7846 Touch-Controller

One day in summer i tested the TFT display 2,4” 240*320. I tested different library. The best I tested was this Adafruit_ILI9340 and the library Adafruit_GFX.h. Just convert signal I/O from 5V to 3,3V change the pin number and all works. Tested some writing. The Code did as in this video TFT video if I remember correct. Also weird up SD card and wives the parrot and sunset.bmp. Tested a simple code for touch screen, ADS7846 Touch-Controller. This will be the display for next QRP station.

Fox Transmitter 80M now Working

 

This work started in Januari 80m Fox it has now came to the end.

The Fox-Transmitter fail in the beginning of the same week that i wont to use them for a competition her in Sweden. Two of the foxes burn up the FET IRF510 after a few minutes. I have a older board off this type and it has run for several years.  As I understand the problem is the high capacitance between terminals on this FET. It was not possible to load the gate more (1k ohm). So I tried to change the FET to a NPN transistor BC139 and it looks promising. I change 2 components R to C and put in R on not used pads. 5 Foxes has now been working for several hours, and in a small competitions W31. But it was a hard fight against  Murphy. I will build 2 more this winter. Stay tuned.  My son has also updated the SW with more Features. I f you won more info please contact me.