Sorry to let you know that a brilliant light that was Price was dimmed on the 21st. Price is a silent key now. He will be missed.XYL Inge
From: Rob Atkinson <ranchoro...@gmail.com> To: topband@contesting.com Sent: Friday, October 6, 2017 5:15 AM Subject: Re: Topband: RX/TX Antenna decoupling, (OFF LIST) > Thanks for sharing this info. > Would you please provide more information on the relay model number and how > it is wired into your system. I used a P&B open frame relay 4PDT but a single throw will work. What's important is that the relay use metal other than steel (or other magnetic metal) for the RF path. The P&B PM17DY satisfies this requirement. I mounted it in a plastic box and mounted UHF jacks on the ends and ran copper strap and AWG10 stranded to the relay, using the AWG10 for the center conductor. I used two poles for the center and two for the cable shield. On rx the relay is open and the inverted L is disconnected from the shack and common mode RF prevented from continuing to the shack. The plastic box is important for this -- a typical metal box would allow the shield RF to continue from the UHF jack flanges around the relay at all times. The relay I used has a 24 v. coil because my T/R sequencing system runs on a 24 v. DC supply. This as all antenna relays should be used with a sequencer to avoid hot switching. Obviously this is not a solution if one desires QSK. In that case a faster switch is needed. 73 Rob K5UJ _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband