I'm looking into a different approach - USB extenders that use Cat-5 or better cables. For home use, Cat 5 is MUCH cheaper than decent coax, even if I have to replace it periodically from exposure or errant lawn mowers. And ZERO possibility of transmitting directly into it (probably still have to protect against 3rd harmonics when operating mode VU).
As an interim test, I used my usual LMR400 into the shack, then the dongle and a coil of about 50ft of cat 5 and the USB extenders. Seemed to work well receiving AO73 telem - no worse than dongle straight into the PC. Need to try it again with the dongle at the antenna. Goal would be a weather proof enclosure and as close as I can get the dongle to the antenna.
Bought the cable and extenders from Monoprice; don't recall the model.
This approach would work well, I think for portable ops, too. Maybe without extenders, just a long USB cable. I think USB 2.0 is rated to 10-15 ft without boosting the signal.
73 Steve KS1G
-----Original Message----- From: "Clayton Coleman" kayakfishtx@gmail.com Sent: Wednesday, February 11, 2015 10:37 To: kb2m@arrl.net Cc: "AMSAT-BB" amsat-bb@amsat.org Subject: Re: [amsat-bb] funcube dongle
Jeff,
Like Alan, I use a manual system to switch between the transceiver and the FCD. When I am receiving on the FCD, there is no transmitter connected to any feedlines for that band. I manually disconnect it from the radio and connect it directly to the FCD. Thus far, this technique has managed to dodge my incompetence and protect my precious dongle.
I have plans to incorporate relays at some point down the road.
73 Clayton W5PFG