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Author Topic: Coax splitter switches  (Read 2328 times)
KD4OMR
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Posts: 7




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« on: February 14, 2014, 05:09:33 AM »

Can anyone tell me if Daiwa (Or any other manufacturer) makes a 2 input/one output switch capable of handling VHF/UHF. I am purchasing their CS-201A single input dual output switch, but I also need the single input single output switch.
Regards,
Walter KD4OMR
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K2QB
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Posts: 103




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« Reply #1 on: February 14, 2014, 06:44:02 AM »

....use the same switch except reverse it.....use the outputs for your inputs....
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K1CJS
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« Reply #2 on: February 14, 2014, 07:17:39 AM »

You've got to be careful, though.  If you get a switch that grounds all but the active (switched to) connection and use it to switch either of two transceivers to a common co-ax, you're effectively grounding the transmitter output of the non-connected transceiver, and if you key the transmitter, you could end up with fried finals in that transceiver.

Better if you get a switch that does NOT ground the connection that is not selected when feeding a single antenna connection. 
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K9YLI
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Posts: 850




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« Reply #3 on: February 14, 2014, 07:53:55 AM »

momentary transmitting into an  open circuit is not a big deal, where transmitting into a short
would be.   but  a long  ''tune up'  inot an  open circuit  wouldnt be good either...
but then  not much is  ''idiot proof.""
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WB2WIK
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« Reply #4 on: February 14, 2014, 10:14:17 AM »

The Alpha-Delta switches like the "Delta 2" do not ground the unused port, so would be safe either way.

I've had Daiwa switches fail completely and tossed the three I've owned.
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KD4OMR
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« Reply #5 on: February 15, 2014, 02:17:00 AM »

TNX to all that responded to my question about coax splitters.
73
Walter KD4OMR
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KA5IPF
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« Reply #6 on: February 15, 2014, 06:55:48 AM »

You've got to be careful, though.  If you get a switch that grounds all but the active (switched to) connection and use it to switch either of two transceivers to a common co-ax, you're effectively grounding the transmitter output of the non-connected transceiver, and if you key the transmitter, you could end up with fried finals in that transceiver.

Better if you get a switch that does NOT ground the connection that is not selected when feeding a single antenna connection. 

And keying up into a switch that has an ungrounded coax leading to an unprotected radio is the recipe for a fried front end on the un-used radio. Better to ground the un-used port. My opinion.

Clif
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G3RZP
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« Reply #7 on: February 15, 2014, 07:26:37 AM »

What you really need is a transfer switch. That way, the rig not in use can be terminated in a dummy load.
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K1CJS
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« Reply #8 on: February 15, 2014, 09:19:38 AM »

And keying up into a switch that has an ungrounded coax leading to an unprotected radio is the recipe for a fried front end on the un-used radio. Better to ground the un-used port. My opinion.

In other words, every time that happens, you're going to fry a front end?  You should have said a possibility of a fried front end.

In essence, any sort of a switched arrangement for antenna connections on a transmitter is a recipe for some sort of possible damage to a rig.  Any sort of arrangement like that should also have a switching arrangement for the power as well, but it's assumed that amateurs would have the sense to know what they're doing....
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KA5IPF
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« Reply #9 on: February 15, 2014, 07:57:57 PM »

And keying up into a switch that has an ungrounded coax leading to an unprotected radio is the recipe for a fried front end on the un-used radio. Better to ground the un-used port. My opinion.

In other words, every time that happens, you're going to fry a front end?  You should have said a possibility of a fried front end.


I did not say every time, I said it's a recipe for it to happen. Not all recipes turn out.

Sheesh, I'm thru...
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K1CJS
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« Reply #10 on: February 16, 2014, 02:13:30 AM »

Sorry 'bout that...  Had one of those moments yesterday morning, and didn't see the intent behind the words.
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G3RZP
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« Reply #11 on: February 16, 2014, 04:36:22 AM »

With a transfer switch, you can't get a tx seeing an open or a short or the other rx front end.
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