SWE DEU ENG
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On this page I would like to present you a high-end concept with a T/R 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)!

    TR-switch-04.png
    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

    TR_SWITCH_F.jpg

    T/R-Switch-R

    TR_SWITCH_R.jpg

    T/R-Switch

    trswitch.png

    CCR-33S1C

    CCR-33S1C.png
    schematic.jpg

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    Important QSL Information!

    1. Electronic forms, only LoTW / QRZ.COM!
    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!

    NOTE!
    Postage from SM since 01/01/2022 is 26 SEK
    until 0.11 lbs / 1.76 oz / 50 g!

    NEW! QSL card direct via PayPal...

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



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