DC resistance of DJ7GP-Feed

  • HI all,

    I have (maybe) a strupid question regarding the DJ7GP-Feed:

    I checked the DC resistance of the 2.4GHz Patch and the meter shows 1.1 Ohms. So now I wonder if the antenna works like a folded dipole which forms a closed loop?


    73 Mic

  • Hallo Mic,

    a few minutes ago I sent the following mail to an OM who asked the same question:

    Your thoughts are correct!

    The radiator and the reflector disc have a mechanical and thus also an electrical connection. At 2.4 GHz, of course, it looks different. Just think of a loop dipole, where you also measure a short circuit at the (symmetrical) feed-in point. ...And it gets even worse! If the loop dipole is directly attached to the boom at its point of symmetry (which is indeed permissible), there is also a conductive connection to the boom. ... and still the structure works. That is the "exciting" thing about HF technology!

    I wish you much success and lots of fun with your activities over QO-100!

    73! Peter, DJ7GP

    PS .: If you have any questions, do not hesitate to contact me!

  • Hello Peter,

    i have a

    DJ7GP V2 2.4 Ghz & 10 GHz antenna with LNB modified 24 Mhz AMSAT DL

    i tried to have a signal connected to a SDRPLAY with a software SDRconnect no signal the LNB is connected with a T-Bias

    can you help me please.

    73, Riri OD5RI