SWE DEU ENG
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On this page I would like to present you a high-end concept with a S/E switch, which I designed together with my radio friend Henrik (DG0LFF). This makes it possible to safely operate an SDR RSPduo and a transceiver on only one antenna, even with high transmit power.

These points were important to us...
  • High isolation of the SDR input at high transmit power (> 1000 Watt) and reliable protection of the SDR,
  • a wide frequency range from LF to at least 2 GHz,
  • a continuous coaxial design to minimise interference and coupling,
  • and the use of the 2 receivers in the RSPduo.
  • Future-proof also for new SDR concepts with extended frequency range up to 18 GHz.

  • In my case I use here for example over the antenna 1 the KW range, 6m, 2m and 70cm. Over the antenna 2 comes here the IF-signal (1089.5 to 1099.0 MHz) from my SAT dish and LNB with the signal from the QO-100 SAT. The decoupling (> -70dB on HF) between the transmitted signal and the SDR is excellent (see the following pictures)!

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    Even at a transmitting power of more than 1000 watts, the transmitting signal at the antenna input of the RSPduo is at a maximum of 65 dbµV or better −42 dBm!!!

    T/R-Switch-F

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    T/R-Switch-R

    TR_SWITCH_R.jpg

    T/R-Switch

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    CCR-33S1C

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    schematic.jpg

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    Important QSL Information!

    1. Electronic forms, only via the LoTW!
    2. eQSL, only via HAMLOG online cloud!
    3. Received QSL via the bureau, also SWL, are confirmed!
    4. QSL card direct! ONLY with a SAE and 3 USD! Otherwise, I send the QSL via bureau!
    5. I do not accept any other online platform! Please don't ask!

    NEW! QSL card direct via PayPal...

    Order your QSL card securely and directly ONLY via Paypal for 3.50 USD! Don't forget your callsign, QSO date and your address!



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