598
Item nr.
| Production | The Netherlands, 2024.
Price was 40. |
|---|---|
| Bands | 0.5 to 30 MHz. |
| Semi- conductors | 2x SST310 (amp), BC337 (relais), 3x LED, 8x 1N4148 (protection), 7x diode. |
| Cabinet | Wood. Size 15x15x6cm. |
| Power | DC 12V @ 107mA. |
| Documents | Description, Decals. |
For my reception, I use magnetic antenna's a lot, but these are very cumbersome with this device, because in addition to tuning and directing the antenna, the three knobs of the Killer must be adjusted to optimal result.
| Obtained | 11/2024 from BDXC Meeting. |
|---|---|
| Condition | 8. |
| Value (est.) | 33€. |
| Sound sample | PLAY SOUND  Receiving WDC Radio. Adjusting the phase knobs results in an increase of static. At the end of the recording, the Noise Killer is switched off. There is a clear and significant improvement over not using the device, when combined with a longwire antenna. The reception of the same station with a loop antenna is better still. |
I then spent some weeks to collect addional parts, such as the antenna jacks, switch, box, and the like, and started construction on November. 
I mounted the PCB in a small wood box, the bottom lined with alu foil as shield. The antenna connections are done with coax leads to jacks in the back. The unit feeds with DC, but as extra protection I included a rectifying diode and three-way smoothing caps. So, the power supposedly has plus as center, but another polarisation will not damage the unit, and with AC it might even work (didn't try).
I mounted the components on the PCB between Nov 29 and December 2, 2024. The next days I measured and drilled the holes in the box. On December 7 I set up the power supply in the box. The whole project was built in and completed on December 9, 2024.
Some electrical measurements: The current draw of the unit is about 107mA. Voltage out of my supply (into J1) is 12.3V. The mains transformer I use has an idle draw of 2.7W and takes 4.7W when the unit is in use.