[amsat-bb] Antenna switching between 2 radios

[Burns Fisher]

Good point, Chris.  I have several different combos that I want and use a
few RF relays.  I have a Raspberry Pi with a touch screen that I use to
switch the various combinations.  The Pi code and a coax schematic is at
github burnsfisher/PiRelayButtons if anyone wants it.  I think there is a
description of the Pi setup in the comments, but essentially you need some
3V relays on the Pi to drive the 12V coax relays coils and (in my case) the
12V preamps.

I use Tohtzu relays that were fairly easy to find on eBay (and a couple
from a fellow ham).

73, Burns WB1FJ.

On Wed, Nov 11, 2020 at 9:20 AM Chris Thompson via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> The MFJ box looks nice, but you can do this with just an RF relay if you
> have one in the junk box.  Maybe you have one lying around from an
> amplifier project that never quite got finished..  You could switch it with
> 12V and a toggle switch.  I switch between an SDR and my 2m transmitter
> when FalconSat needs to be sent a packet.  The TNC keys a sequencer which
> then switches everything over including the antenna.  So the 2m antenna is
> only connected to the 2m radio when it sends a packet.  The rest of the
> time it is connected to an SDR monitoring telemetry.
>
> 73
> Chris
>
> On Mon, Nov 9, 2020 at 2:03 PM Jack Spitznagel via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>
> > I use the MFJ-1708SDR switching system this way with an SDRPlay RSPdx...
> > works beautifully, runs off my field Bioenno.
> >
> > Jack Spitznagel - KD4IZ
> > Science River LLC
> > Biomedical Consulting Services
> >
> >
> >
> > -----Original Message-----
> > From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Bob Hammond via
> > AMSAT-BB
> > Sent: Monday, November 9, 2020 12:55
> > To: amsat-bb at amsat.org
> > Subject: Re: [amsat-bb] Antenna switching between 2 radios
> >
> > I use two Alpha Delta Model DELTA-2B/N coax switches for this very
> > application.
> >
> > Bob W7OTJ
> >
> >
> >
> > On Mon, Nov 9, 2020 at 8:10 AM Don Solberg via AMSAT-BB <
> > amsat-bb at amsat.org>
> > wrote:
> >
> > > I am using HPSDR and SDR Play as my receiver radio, and a Yaesu FT-857
> > > for my transmitter.  I am looking for an easy way to switch the VHF
> > > and UHF antennas to the appropriate radio.  I have found a discussion
> > > on automating this process with SatPC32 and a "coaxial transfer
> > > switch" but there is no information on what switch to use for this.  I
> > > don't need this to be automated but I am looking for something better
> > > than manually swapping coax cables.
> > >
> > > 73,
> > >
> > > Don K9AQ
> > > _______________________________________________
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> > _______________________________________________
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> > _______________________________________________
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> > to all interested persons worldwide without requiring membership.
> Opinions
> > expressed
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>
>
> --
> Chris E. Thompson
> chrisethompson at gmail.com
> g0kla at arrl.net
> _______________________________________________
> Sent via AMSAT-BB at 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!
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>