It just realized that the number of turns I specified (in my post below) to use on the Fair-Rite binocular core will be a tight fit inside the core. The number should be scaled down as follows:
5 turns of 28 AWG magnet wire on the source side and 7 turns center-tapped on the load side. That will work. 73, John W1FV -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of John Kaufmann Sent: Saturday, February 2, 2019 11:56 AM To: [email protected] Subject: Re: Topband: Rx splinter The BCC splitter design suggested by PC2A is based on the "magic tee" splitter. An excellent tutorial on magic tee splitters can be found on W8JI's Web site: https://www.w8ji.com/combiner_and_splitters.htm. These splitters are very easy and inexpensive to build. A 1:2 splitter design using a single ferrite core can be found here: http://michaelgellis.tripod.com/magict.html. See Figure 7. There is -3 dB throughput from the source to each load port. This splitter introduces a 180 degree phase shift between the two output ports but this is irrelevant for splitting a receive antenna between two receivers. I have built many of these using Fair-Rite 2873000202 cores. For a 50 ohm system, change the 37.5 ohm resistance to 25 ohms. Use 7 turns (28 AWG magnet wire is suggested) through the binocular core on the source side and 10 turns center-tapped on the load side. This will provide a 50-ohm input impedance on all ports and excellent isolation (>25 dB) between the two load ports. 73, John W1FV _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
