I've got my bonding about as good as I can get it for the moment, although I'm probably going to do some improvements this year. The lightning arrestors are built in to the RCS-12 antenna switchbox (RCS-12L with the gas discharge tubes), and everything's bonded at the base of the tower. There's a single feedline coming inside from that tower-mounted switchbox. Each piece of radio gear and the computer inside is bonded by 1" braid going to a copper bus. LAN and voice line comms are not, however the connection from the pole is fiber, not copper so that's not likely a problem. The copper bus inside is bonded to a ground rod outside the shack, which in turn is bonded to the tower ground system.
The deficiency is that the copper bus is not grounded to the same point as the tower, since the tower is about 50 feet away from the shack. I guess I could run a 50 or 60' run of 2" strapping from the desk, through the floor, across the crawlspace, and out the conduit to the tower, but I suspect that might be more a hindrance than a help, quite honestly. - pjd -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Jim Brown Sent: Monday, March 11, 2019 2:18 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] 80m KPA1500 High reflected power problems **SOLVED!** On 3/10/2019 10:33 PM, Peter Dougherty wrote: > I have a 30 foot vertical ground-plane style antenna that I use for diversity RX on 40 and 80, which was connected to the AUX antenna port. This was being overloaded by the QRO power from the TX antenna feedpoints just a few feet laterally and 40-50' higher vertically. As soon as I disconnected this antenna the problem went away. Hi Peter, It sounds to me like your station (and maybe your home) is not properly bonded. All of your feedlines SHOULD be bonded to a common ground at lightning arrestors where they enter your shack, all the equipment in your shack SHOULD be bonded together and to all of the grounds in your home including that one, power, telco, CATV, and satellite. If you've done this, disconnecting one of the antennas from your rig should not change anything on the transmit side -- the only change should be overload of the second RX by that antenna. Two good references on grounding and bonding. One is N0AX's recent ARRL book on the topic. The second is the set of slides for talks I've done at Pacificon and Visalia on the topic. http://k9yc.com/GroundingAndAudio.pdf 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
