40 M Mobile Antenna

 It is really very cheap antenna, and every body can build it. The whip is larsen antenna and the lower part is PVC 1-1/4" as core and body it self. I make three parts of winding. First, 44 turns close winding is in the upper part of PVC, and the center part is 4 turns with wide space winding then the lowest is for matching impedance has 8 turns with one wire spaced winding. The PVC length is 40 cm and I use heat shrink rubber to keep rigid and avoid of rain water. This antenna is quite good both for reception and transmission, but unfortunately, the bandwidth is only 20 khz and the lowest swr is 1.2: 1.I put this antenna at rear corner of the car. Up to now the longest distance is Pakistan, with FT 180A .

HF ANTENNA ANALYZER

      

This antenna analyzer is copied from VK5JST but offcourse, I change the impedance and swr display with vu meter.

60A SWITCHING POWER SUPPLY

Thank for James Arthur, I have finished from your basic schematic, and  I combine it with SMPS schematic I got from ARRL Handbook, now it becomes 60 A.

ANOTHER PROJECT

Both of these oscillator I built for any channelized radio purpose . PLL, the upper row, using common  design TC9122 but the display I take from IK3OIL using 7 segment because it is looked brightly for an old man like me especially in the darkness of  the night. Another advantage of this display is programmable offset so it can be used for any frequency of IF.

The second row is FLL, it is also from IK3OIL, but there is somewhere modification in oscillator region. Now I used it for FT 300 C oscillator for base station and PLL + FT180A I install in the car.

                                                                                                   

MY HOMEBREW

 

This is my second home made radio with 2 band operation 80,40m, the tubes are only for rf amplifier using a pair of 6146, the rest are transistor.  The filter I am using Collin 455 khz mechanical for side band filter.

  

This is my HF antenna 80M ( upper ) and 40M  ( lower ). All are shortened dipole type, 13m total length for 80m band and 9m for 40m band.