[Antennas] 80/160m trap dipole problem

Brian Cake bcake at bellsouth.net
Sat Jul 31 16:52:24 EDT 2010

• Previous message: [Antennas] 80/160 trap dipole problem
• Next message: [Antennas] 80/160 trap dipole problem
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

---

Myles,
 I would retire your traps. The one with a cracked insulator is particularly suspect. Unbeknownst to most, traps are subject to very high circulating currents, and very high potentials...much higher than you might calculate at the feedpoint. Your cracked insulator is carbonized and probably arcing when you use high power, and that causes the fluctuating SWR indication.
 I managed to fuse a TA33jr trap when I used a 30-L1 linear with it many years ago...the coil simply melted. Some modeling I did awhile ago, plus some theoretical models of trap performance showed that traps are generally very lossy and the currents and potentials in them are extremely high.
 Hope this helps
 73
 Brian KF2YN

---

• Previous message: [Antennas] 80/160 trap dipole problem
• Next message: [Antennas] 80/160 trap dipole problem
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

---

More information about the Antennas mailing list