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Author Topic: Second receiver on antenna  (Read 1033 times)
WX2S
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Posts: 726




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« on: March 22, 2013, 06:49:17 PM »

Is there some gizmo that will let me hook a second receiver to my antenna without blowing it up when I transmit or degrading the received signal?

73,
Wx2s.
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73, - Steve WX2S.
I subscribe to the DX Code of Conduct. http://dx-code.org/
WD4ELG
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Posts: 873




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« Reply #1 on: March 22, 2013, 06:57:28 PM »

http://www.dunestar.com/store/HF-Triplexer-BandPass-Filter-Package-pid-7.html
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WD4ELG
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Posts: 873




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« Reply #2 on: March 22, 2013, 07:05:07 PM »

Note that this is for using a single tribander yagi with a rig on each band.  It is NOT for two rigs on the same band.

Are you looking for a receive-only separate unit like for 160 meters?

http://www.arraysolutions.com/Products/as_rxfep.htm
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WX2S
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Posts: 726




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« Reply #3 on: March 23, 2013, 04:06:12 AM »

Actually I want to hook up a SDR as a skimmer on the same antenna that my rig uses.

73,

Wx2s.
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73, - Steve WX2S.
I subscribe to the DX Code of Conduct. http://dx-code.org/
N4CR
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Posts: 1666




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« Reply #4 on: March 23, 2013, 08:27:01 AM »

If the timing is correctly implemented in the transmitting rig, then the keying line will activate before the transmitter comes on line. If this is the case, you could use a single pole double throw relay to swing the connection for the second rig from the antenna to ground.

If the timing is improperly implemented or if the relay is too slow, you get a pile of slag.

You'd need a dual trace triggered scope to make the decision. If you determine that the delay is adequate and the relay is fast enough, your second radio is safe.

If it were me, I'd pass. Long term, if any component in that circuit fails, you get slag. Not a good fall back position.
« Last Edit: March 23, 2013, 08:49:39 AM by N4CR » Logged

73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
K8AC
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Posts: 1471




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« Reply #5 on: March 23, 2013, 08:40:05 AM »

There's an easy way, but it depends upon the transceiver you're using.  Some transceivers have a receive antenna loop - on the rear panel there would be a jack for receive out and one for receive in.  The two would normally be jumpered together.  With that type of setup, you could build or obtain an HF splitter (Clifton Laboratories has a low price kit) and feed the receive out line to the splitter input.  The splitter output #1 would go to the transceiver receive input and the splitter output #2 would go to the SDR antenna input.  This would drop the receive signal by 3 dB in each receiver, but that's really of no consequence.  That's what transceivers with two receivers do anyway.  With this arrangement, you don't have to worry about protecting the SDR on transmit.

73, Floyd - K8AC
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WX2S
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Posts: 726




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« Reply #6 on: March 25, 2013, 09:25:55 AM »

There's an easy way, but it depends upon the transceiver you're using.  Some transceivers have a receive antenna loop - on the rear panel there would be a jack for receive out and one for receive in.  The two would normally be jumpered together.  With that type of setup, you could build or obtain an HF splitter (Clifton Laboratories has a low price kit) and feed the receive out line to the splitter input.  The splitter output #1 would go to the transceiver receive input and the splitter output #2 would go to the SDR antenna input.  This would drop the receive signal by 3 dB in each receiver, but that's really of no consequence.  That's what transceivers with two receivers do anyway.  With this arrangement, you don't have to worry about protecting the SDR on transmit.

73, Floyd - K8AC
Yep. Per Elecraft:
Quote from: AB7MY in email
Hi Steve,

Yes, that will work without any changes to the rig.  Just connect the other rig to the RX OUT bnc and turn on RX ANT from the front panel.

--
73, Gary AB7MY
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73, - Steve WX2S.
I subscribe to the DX Code of Conduct. http://dx-code.org/
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