Hi Tom, I (+ OK1RF) have 2 Orions and Two HC4 Prosets. Neither combination does anything described, since we made 3 turns on low frequency toroid - from PC PS. before it did. I do not understand why, since the radio room we use is made of 3mm steel, i.e. well grounded Faraday shield, but.... 73 ! Jiri OK1RI