I know it isn't exactly what you were looking for... Back when I had a station I ran some cat5 cable out to the mast. I ran a bunch of switches in the shack and could independently do pre-amps, polarization changes, etc... It was pretty easy and fool proof, and kept my options open. None of this stuff draws much current, and cat5 is really cheap. 73,Joe kk0sd

On Sunday, February 19, 2017 11:47 AM, Mike Seguin n1jez@burlingtontelecom.net wrote:

Both Down East Microwave and SHF-Elektronik sell a bias tee.

What Radio are you using? Some can add voltage on the coax for you. For instance, the FT-847 can do it.

DEMI is $40-45.

For Coax switching, SHF-Elektronik has the CAS. You didn't mention power level....

Mike

On 2/19/2017 12:33 PM, Dale Kubichek via AMSAT-BB wrote:

These are very good devices (lil pricey), but an issue I found is they do not sell the shack-coax-end 'voltage input/isolation' box/device to power these via coax. Just like I'd like to find a solid low-loss on-mast two-position-coax-switch to be controlled via ~12VDC from the shack coax. Making changing CP or Vet/Horz easy with only one coax feed. I want them for 2m/70cm/1.2G. MFJ has one but it's not rated for >150MHz.   Best regards, Dale Kubichek, MS-EET, N6JSX Sidney, OH 45365  EN70vh

http://groups.yahoo.com/group/HAM-SATs http://groups.yahoo.com/group/RDF-USA Message: 2 Date: Sat, 18 Feb 2017 20:34:38 -0500 From: Paul Stoetzer n8hm@arrl.net To: "kb2cwn@yahoo.com" kb2cwn@yahoo.com Cc: "amsat-bb@amsat.org" amsat-bb@amsat.org

Advanced Receiver Research has the most cost effective mast-mounted RF switched preamps.

http://advancedreceiver.com/page10.html

SSB Electronics' line of preamps might be better, but are more expensive.

http://www.ssbusa.com/NEWSSBPREAMPS.html

73, Paul, N8HM _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

FT-767GX, IC-271/471, IC-7000, only my IC-9100 can do this (Set Mode items 45/46/47 'pre-amp', unknown voltage/max-current as manual does not state).

Hence why most older radios need to have a shack external coax-VDC injector/RF-filter device to make work.   Best regards,   Dale Kubichek, MS-EET, N6JSX

From: Greg D ko6th.greg@gmail.com To: Dale Kubichek N6JSX@Yahoo.com; "amsat-bb@amsat.org" amsat-bb@amsat.org Sent: Sunday, February 19, 2017 2:39 PM Subject: Re: [amsat-bb] (no subject)

What rig are you using in the shack?  Many of them have the option to power a pre-amp via the coax, though sometimes this requires opening the box up to move a jumper.

Greg  KO6TH

Dale Kubichek via AMSAT-BB wrote:

These are very good devices (lil pricey), but an issue I found is they do not sell the shack-coax-end 'voltage input/isolation' box/device to power these via coax. Just like I'd like to find a solid low-loss on-mast two-position-coax-switch to be controlled via ~12VDC from the shack coax. Making changing CP or Vet/Horz easy with only one coax feed. I want them for 2m/70cm/1.2G. MFJ has one but it's not rated for >150MHz.   Best regards,  Dale Kubichek, MS-EET, N6JSX Sidney, OH 45365  EN70vh

http://groups.yahoo.com/group/HAM-SATs http://groups.yahoo.com/group/RDF-USA Message: 2 Date: Sat, 18 Feb 2017 20:34:38 -0500 From: Paul Stoetzer n8hm@arrl.net To: "kb2cwn@yahoo.com" kb2cwn@yahoo.com Cc: "amsat-bb@amsat.org" amsat-bb@amsat.org

Advanced Receiver Research has the most cost effective mast-mounted RF switched preamps.

http://advancedreceiver.com/page10.html

SSB Electronics' line of preamps might be better, but are more expensive.

http://www.ssbusa.com/NEWSSBPREAMPS.html

73, Paul, N8HM _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb