- 1. Topband: Voltage along coax feeder (score: 1)
- Author: David Cole <g3rcq@yahoo.co.uk>
- Date: Tue, 26 Mar 2013 20:48:50 +0000 (GMT)
- Could anyone please point me in the direction of a circuit to feed +12 -12 and AC along the feeder to my beverages to switch 3 relays - thanks all from Dave in the UK All good topband ops know fine w
- /archives//html/Topband/2013-03/msg00139.html (6,967 bytes)
- 2. Re: Topband: Voltage along coax feeder (score: 1)
- Author: "Shoppa, Tim" <tshoppa@wmata.com>
- Date: Wed, 27 Mar 2013 14:32:25 +0000
- September 1997 QST, K9AY relay and switch box. Usually done with two DPDT relays (giving 4 possible permutations) rather than three SPST relays. Google will find you many slight variations of the rem
- /archives//html/Topband/2013-03/msg00141.html (8,266 bytes)
- 3. Re: Topband: Voltage along coax feeder (score: 1)
- Author: Les Kalmus <w2lk@bk-lk.com>
- Date: Wed, 27 Mar 2013 11:16:37 -0400
- Dave, For design parameters check out: http://en.wikipedia.org/wiki/Bias_tee I use a home brew one for reversing remote beverages which is a .1uf cap and any small rf choke in the 100uh and up range
- /archives//html/Topband/2013-03/msg00142.html (8,136 bytes)
- 4. Re: Topband: Voltage along coax feeder (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Wed, 27 Mar 2013 11:31:39 -0400
- Check the Ameritron RCS-4 circuit. Selects 4 antennas with voltages over the coax. Requires relays with excellent isolation for Beverages, the RCS-4 is poor and I eventually built my own with DIP siz
- /archives//html/Topband/2013-03/msg00143.html (7,924 bytes)
- 5. Re: Topband: Voltage along coax feeder (score: 1)
- Author: donovanf@starpower.net
- Date: Thu, 28 Mar 2013 11:18:09 -0400 (EDT)
- Its very wise to use an isolation transformer -- at least at the receiver end -- so a shorted capacitor can never result in a blown radio front end! As W8JI has pointed out, be very careful to take p
- /archives//html/Topband/2013-03/msg00144.html (9,376 bytes)
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