{"id":47,"date":"2013-01-16T17:23:54","date_gmt":"2013-01-16T16:23:54","guid":{"rendered":"https:\/\/pa3csg.nl\/?page_id=47"},"modified":"2016-12-23T18:17:47","modified_gmt":"2016-12-23T17:17:47","slug":"remote-antenna-switch","status":"publish","type":"page","link":"https:\/\/pa3csg.nl\/?page_id=47","title":{"rendered":"Remote antenna switch"},"content":{"rendered":"

As a result of the solid state protection found on this web-page I decided to play with a<\/p>\n

remote antenna switch which could switch up to 10 antennas via the coax.<\/p>\n

Since several years a 4 port switch is in use. It uses the coax and it as 3 options:<\/p>\n

1. no voltage on the coax<\/p>\n

2. positive voltage on the centre of the coax<\/p>\n

3. negative voltage on the centre of the coax<\/p>\n

4. An AC voltage on the coax. This voltage is rectified at the remote antenna switch.<\/p>\n

In the beginning I used some open frame relays, but later I switched to PCB relays using 2 x 16A contacts.<\/p>\n

These relays are sealed and much better for outside use. Problems in the beginning occurred with the chokes.<\/p>\n

It resulted in some nice burned PCB tracks.. Be careful with series resonances!<\/p>\n

\"burned-pcb\"<\/p>\n

 <\/p>\n

I cannot tell you what chokes to use as these were in my junk box.<\/p>\n

The system can also be build in free air.<\/p>\n

\"remote-switch-free-air\"<\/p>\n

This was the one which originally used open frame relays, these were replace by the PCB relays<\/p>\n

 <\/p>\n

The final solution was the unit with the LM3914 switch outside and the LM317 as a regulated power supply inside.<\/p>\n

Some pot-meters are needed as one needs to adjust the voltage in a way that the correct relay is activated.<\/p>\n

 <\/p>\n

\"ant-switch2-indoor\"<\/p>\n

 <\/p>\n

\"ant-switch2-outdoor\"<\/p>\n

 <\/p>\n

Please save the pics to your computer to view them bigger.<\/p>\n

Make sure the voltage on the coax starts well above 12V, say 15V, this leaves room for using an 7812 to regulate the voltage.<\/p>\n

The higher voltage is than fed to a voltage divider and fed into the LM3914. In this way the supply voltage and the control voltage<\/p>\n

can be on the same coax.<\/p>\n

 <\/p>\n

Good luck experimenting!<\/p>\n","protected":false},"excerpt":{"rendered":"

As a result of the solid state protection found on this web-page I decided to play with a remote antenna switch which could switch up […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":862,"parent":0,"menu_order":63,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"categories":[38,16],"tags":[],"_links":{"self":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/47"}],"collection":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=47"}],"version-history":[{"count":4,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/47\/revisions"}],"predecessor-version":[{"id":1020,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/47\/revisions\/1020"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/media\/862"}],"wp:attachment":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=47"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=47"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=47"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}