aiz@JPL-VLSI.ARPA (08/26/85)
While tuning up on 40 meters last night, my electronic phone started making funny noises. When I tried to use the phone, it was dead. I "fixed" the phone by discharging all the capacitors (big tantalums) and plugging the phone back into the phone line. The phone worked fine. The phone is phone line powered and I think that the bridge on the input to extract the battery was rectifying RF and did strange things to bias circuits in an inoperable way. I seem to have solved the problem with a .005 uf cap across the tip and ring. My US Robotics Password Modem, however, also appears to have died; apparently from the same cause. Has anyone experienced similar problems from "RFI"? Art Zygielbaum, WA6SAL
go@orstcs.UUCP (go) (09/03/85)
Regarding the 40 meter RFI problem, I don't have any difficulty on 40. However, you should see the light show on my H-19 terminal when I tune up toward the top of 80. Really fancy. Also, my hard-disk drive does a dance or two at the same time. The comment about the US Robotics modem also applies here on 80. I am running a Galaxy III (300 w pep) into an inverted V (sort of lazy inverted v). I fail to have any problems on any other equipment: phones, other computers, etc. In fact, I have another Z80 machine sitting right next to the rig (also 4mhz clock) and it NEVER suffers. It is, however, far more sensitive to glitchy power. Makes no sense. -Gary, Wa7shi.