Antenna trap kit, ideal for wire antennas

 5,00 Incl. VAT

This homebrew antenna trap kit contains the following parts:

  • Basic circuit board for antenna trap
  • PVC tube for coil
  • Enameled copper wire 0,75 mm, 3 meters
  • Heat shrink tubing
  • 2x Capacitor 100 pF 2kV

Click here! Antenna trap kit building instructions

In stock

Description

Antenna trap kit, this kit contains everything to make your own trap.

A trap is used as a blocking component for one specific frequency. This can be applied in for example a wire antenna.

A grid-dipper or spectrum analyzer is needed to tune the trap.

For light antennas and field work, solder directly to the trap pcb. For longer or permanently installed antennas, it is better to use a proper strain relief.

Click here!!! Antenna stage kit building instructions

Example 1: multiband dipole antenna for the 10 and 20 meter band using antenna traps

Trap by making two stages that are resonant at the highest frequency. That’s the 10 meter band in this example. If you build the stages in such a way that the resonance frequency is at 28.5 MHz (see building instruction), then signals with this frequency will be blocked. Now start making a standard dipole antenna for the 10 meter band. So a feed point (preferably a 1:1 BalUn) and two pieces of antenna wire of about 2.5 meters ( 300 / 28.5 * 0.95 / 4 = 2.5 mtr). Start with a little more length so you can cut more. Once you have the antenna in resonance for the 10 meter band, the stages can be placed at either end. Now add the other two pieces of antenna wire for the 20 meter section. In our example also about 2.5 meters per side. Now cut the ends to length so that the antenna is in resonance on the 20 meter band. It is also possible to apply this trick a few more times to add a few more bands to the antenna.

Example 2: multiband end-fed antenna for the 40 and 60 meter band using an antenna trap

Start by making one trap resonant at the highest frequency. That’s the 40 meter band in this example. If you build the trap in such a way that the resonance frequency is at 7.1 MHz (see building instruction), then signals with this frequency will be blocked. Now start making a standard end fed antenna for the 40 meter band. So a feedpoint (1:49 impedance transformer) and a piece of antenna wire of about 20 meters ( 300 / 7,1 * 0,95 / 2 = 20 mtr). Start with a little more length so you can cut more. Once you have the antenna in resonance for the 40 meter band, the trap can be placed at the end. Now add the remaining piece of antenna wire for the 60 meter section. In our example about 7 meters. Now cut the ends to length so that the antenna is in resonance on the 60 meter band. It is also possible to apply this trick a few more times. This makes it possible to add more bands.

 

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