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Showing posts from February 27, 2022

Reducing Powerline RFI

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 I’ve had a lot of RF noise in my home since I moved in 2013.  Noise on the phone lines, intermittent cable TV and internet outages.   Spectrum has been out multiple times to replace lines, fix coax connectors and even installed amplifiers up in the attic.   All these actions helped to some extent. But getting the mobile HF capabilities in my jeep has let me test interference in my neighborhood.   I was very surprised how quite the 40 and 20 meter bands are just a block up the street.   I conducted a simple drive around, observational test and shared the results with Oncor who is responsible for electric delivery services in my neighborhood.  I started the process by calling 888-313-6862 Oncor Electric Delivery Services and reported "radio, telephone and TV interference" that appears to be due to the electric lines in my alley. The service rep asked me a few questions and opened a trouble ticket.   She informed me that a Field Check would be scheduled for my address to diagno

Mobile HF with Yaesu ATAS-120a Actively Tuned Antenna

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April2022 update. The ATAS-120a is going strong one month in. Follow up on the last vfo error issue that was happening on 20m- turns out it was RFI that 8 snap on ferrite chokes cured.   I put them on the feed line near the KN-400 mount.   I’ve  recently added mobile HF capabilities to my Jeep and I can vouch for the Yaesu ATAS-120a.   It’s a great little performer once I got it fully grounded and bonded to my truck frame.   I tried several mounting locations before I remembered there is a convenient grounding bolt just under the hood on the passenger side of my 2018 Grand Cherokee Trailhawk.  The bolt is is used to jump start the vehicle and can easily be removed with a socket wrench so that you can bolt down a ground strap. The antenna is mounted to the hood using a Diamond K400S mount and cable set.   An SMA to SO-239 adapter is included.  I ran the coax thru the Jeep’s fender wheel well and into a the vehicle thru an existing firewall grommet on the passenger side of the vehicle.