Re: Homebrew traps


"Barrett" <barrett@xxxxxxxxxxxxxxxxx> wrote in message
news:Gs4Hj.103886$M9.49799@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Some one sent me an email and said these will do the job. Ceramic
capacitor disk 10KV/1000pF. Do you think these would work?

This is my first attempt at making traps and I do not fully understand how
they work. I am willing to learn as this is what makes the hobby great but
I cannot find enough step by step info to lead me in the right direction.

No. For an 80/40 meter trapped dipole, the traps will need a capacitor close
to 60 pF. 1000 pF will not be suitable.

You might look at the traps made of coaxial cable where the inductance is
tuned to resonance with the capacity of the cable length itself. No easier
to construct, and heavier than the wire wound/capacitor trap, but eminently
easier to obtain in the materials department.

Info available from Google.

W4ZCB


.

Relevant Pages

  • Re: Reasonably-priced capacitors for traps
    ... approximately 20pF/foot for 75 ohm types. ... Also, the antenna is meant to be portable, and so the traps need to be as ... I used a short stub as a padder across a doorknob capacitor ...
    (rec.radio.amateur.antenna)
  • Re: help interpreting Gleemax posts
    ... They do keep talking about how they're making traps into more than ... while they try to avoid being hit. ... to support them, so that it doesn't rely on GM fiat or ad-hoc ...
    (rec.games.frp.dnd)