40m Traps for W3DZZ Antenna (priced per pair of traps)
The "W3DZZ antenna" is Charles Buchanan's famous design for a multiband doublet for 80-40-20-15-10m. Perfect for the keen experimenter requiring an effective portable antenna.
Our traps make the construction of your multi-band antenna much easier! Our W3DZZ traps are supplied in kit form, in packs of two (2) traps. SOTABEAMS' traps are small and light, reducing the mechanical and visual problems that can occur with heavier co-ax traps. SOTABEAMS W3DZZ traps have 100 pF 1 kV capacitor in parallel with a 5 uH toroidal inductor. The traps will need weatherproofing before use. We recommend Liquid Electrical tape.
We recommend using a 1:1 balun with all trapped dipole/doublet antennas. Our balun does a great job. The balun stops the feeder becoming part of the antenna system. My experience is that in the case of trapped antennas, feeder coupling makes them harder to adjust.
The following links describe versions of the W3DZZ antenna:
- Aarre OH2EC shows his improved W3DZZ.
- Mario G8ODE of the Royal Signals Amateur Radio Society discusses the standard W3DZZ antenna in this paper.
- Len GM0ONX describes his W3DZZ antenna in an article from Practical Wireless.
- Christian OZ1CX builds a version of the W3DZZ with improved matching.
- Bob ON9CVD does some detailed analysis of the W3DZZ antenna.
SOTABEAMS traps are the smallest and lightest commercially available traps.
Note: we only provide the traps in kit form. You must assemble the traps and make the antenna yourself.
What's included in a SOTABEAMS Trap kit?
2 x high quality trap PCBs with plated through holes
4 x 100pF 1kv capacitors (used in series or parallel to give 50pF, 100pF and 200pF options)
2 x mounting hardware for toroids
2 x toroids (T94-2)
Enamelled copper wire
Downloadable instructions For this trap:- Use one 100pf Capacitor per trap and 23 turns
Power rating: 100 Watt
Centre frequency: 7.1 MHz
Weight: 28 g = 1 oz
Length: 6.75 cm, 2.75 inches
4 Reviews Hide Reviews Show Reviews
Really a good idea and a great execution! Have the traps for safety's sake packed in bubble gum cups and now a lightweight, powerful multiband portable antenna.
These traps are robust and ready to roll. Using lightweight wire, Liquid Tape waterproofing, and a Sotabeams 1:1 balun, I had excellent results on 80 and 40 metres from the start, using my FT817.. Well worth the money.
Bought a set of the W3DZZ antenna traps. Works as designed. Great product quality. Used Liquid Tape for sealing. SWR is very good without a tuner for 3.7, 7.0 and 21MHz. Very lightweight, so this is one of the antennas to be in the bag for my trips.
These traps, along with the lightweight wire and 1:1 balun, make a perfect. lightweight, but fully capable (up to 100W) portable antenna. Whether a field day event, or just camping, these components provide everything you need in an easy to pack and easy to deploy package.