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 [email protected] To: "[email protected]" [email protected] Cc: "[email protected]" [email protected]
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 [email protected]. 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