> On Feb 9, 2021, at 7:47 AM, Joe Mixsell <[email protected]> wrote: > > Thanks guys for input. Will see if I can keep the RF out. > >>> On Feb 8, 2021, at 3:58 PM, Jim Brown <[email protected]> wrote: >>> >>> On 2/8/2021 4:19 PM, JOE MIXSELL wrote: >>> Wonder if anyone has seen this behavior and if so what might you have done >>> to eliminate it. Set up is TS 590, MFJ 1204 and HP labtop. Cabling >>> supplied by MFJ with the 1204 unit. Antenna is ground mounted vertical >>> about 35 to 40 feet from shack. For a power out level of 25 watts or less >>> the transmitter seems to function normally but at a higher level the output >>> from the transmitter is irregular, varying rather than a steady output >>> level. I'm believing that there is some RFI susceptibility in the 1204 >>> itself or the cabling. Has anyone seen something similar and if so what >>> did you do to eliminate the problem. >> >> Lots of study material on my website about curing RFI. First, study this one >> about bonding, and do it in your station. >> >> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fk9yc.com%2FGroundingAndAudio.pdf&data=04%7C01%7C%7C3d9abac4410c4aef775e08d8cd1a67e0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637484860579675388%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=6gWoQGH6HcB6WHiDUmCwVq%2F3MT%2BLxH45ZZ1BB%2B3rv5E%3D&reserved=0 >> >> Second, use ferrites on cables connecting equipment in your shack as >> described in this tutorial on killing RF noise. The document is geared to >> killing RX noise, but the same Laws of Physics apply to receiving >> interference. >> >> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fk9yc.com%2FKillingReceiveNoise.pdf&data=04%7C01%7C%7C3d9abac4410c4aef775e08d8cd1a67e0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637484860579675388%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=YESHUj8ksF9K8iT53SdhAr1xZKYDArxMVtwkvVn6%2BbY%3D&reserved=0 >> >> Third, look at your vertical. Is it one that requires radials? Does it have >> resonant radials for every band? If it doesn't, or if it doesn't have >> enough, the vertical will use your coax shield as a radial, putting RF in >> your shack. >> >> And finally, use this Cookbook to build a common mode choke to be installed >> at the base
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