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TOPIC: Antenna switching

Antenna switching 02 Nov 2021 19:23 #1

  • torriens
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When I want to use antenna port (A2) for receive only with a LOTG receive antenna for the lower bands and use antenna port (A3) only for transmit, will then port A2 go to ground? So I will not get interference on my receive A2 port. Or damage the transceiver?

Thank you all for your comments!
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Antenna switching 03 Nov 2021 08:40 #2

  • iw7dmh
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Hi,
I used most of the time both the Pro2 and the DX rig, switching A2 and A3 antennas without any problems.
Only be sure to set the RX antenna (A2 or A3) in the Antenna panel so that you won't accidentally transmit on it.
I am just findind a bit annoying the TX/RX or the ANT-2/3 relays (I don't know which of them) and I am wondering if the next batch of DX and pro2 will provide a noiseless solid state relay. A DIY rig modification would be fine as well.
Working in full-qsk on different RX/TX antennas is almost impossible for me.

73' Enzo
iw7dmh
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Antenna switching 03 Nov 2021 11:04 #3

  • N8SDR
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The short answer is yes , just set which ever connector your using for the Loop on the Ground as a RX only option in the settings,
73 Rick
Last Edit: 03 Nov 2021 11:05 by N8SDR.
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Antenna switching 03 Nov 2021 18:39 #4

  • torriens
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Ah, okay.
Thank you both for your help.
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Antenna switching 10 Nov 2021 17:07 #5

  • danielwee
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Just to clarify - you're saying yes, during TX the unused antenna (A2 or A3) will be grounded. Did you also mean that it will only be grounded (ie. the front end is protected) when that non-transmitting antenna is set to RX only? If you fail to do that, is it still grounded?
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Antenna switching 14 Nov 2021 18:46 #6

  • SV3RF
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HI,
What about the need of a Front End Saver to protect the A2 during TR.
Is it necessary ?
Agelos-SV3RF
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Antenna switching 15 Nov 2021 11:29 #7

  • danielwee
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It seems that N8SDR was suggesting that the ANT3 input is grounded (and therefore protected) when ANT2 is transmitting. I was trying to get clarification if this was what was meant but am still waiting some confirmation.
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Antenna switching 15 Nov 2021 12:17 #8

  • SV3RF
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Well, the question remains to the forum.Is the RX Only input protecting the front end circuit during transmitting with a high power linear amplifier (not the 100w) of the SUNSDR2 DX device ?
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Antenna switching 15 Nov 2021 20:35 #9

  • N8SDR
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SV3RF wrote:
Well, the question remains to the forum.Is the RX Only input protecting the front end circuit during transmitting with a high power linear amplifier (not the 100w) of the SUNSDR2 DX device ?

I am suspecting that Yes During TX that the RX Only Ant is disabled internally

I could be wrong- and perhaps Roman or Vasilly can clarify if that is not the case
73 Rick
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Antenna switching 16 Nov 2021 07:36 #10

  • SV3RF
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Many Thanks for the quick reply Rick.I wish the protection is good enough as the receiving antennas are very close to the transmit one.
73 Agelos
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Antenna switching 16 Nov 2021 10:04 #11

  • danielwee
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I have the same concern Agelos. The two antennas are quite close and may see high induced voltages/currents.
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Antenna switching 16 Nov 2021 10:23 #12

  • Rome
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Hello,
When you TX using A2, A3 is grounded and vice versa.
You can see it on the diagram of the TRX on our web-site - eesdr.com/images/Document/SunSDR2_DX/Block-diagram_SunSDR2DX.jpg
Роман, Roman
Expert Electronics
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Antenna switching 16 Nov 2021 11:58 #13

  • danielwee
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Thanks Roman - I forgot to look at the block diagram. That's really good to know.
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Antenna switching 16 Nov 2021 12:31 #14

  • SV3RF
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Hi Roman,
Thanks for the clear answer.
73, Agelos
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Antenna switching 18 Mar 2022 17:30 #15

  • torriens
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Solved
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