Calling all youth contesters!

Discussion in 'Youth Forum' started by WQ2N, Feb 19, 2007.

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  1. VE6WTF

    VE6WTF Ham Member QRZ Page

    And to bad the station I talked to was a G4
    And a M0
     
  2. DJ1YFK

    DJ1YFK Guest

    Fine then!

    There is absolutely nothing wrong with measuring zero ohms between the center pin and the chassis. See what I just measured at my K2:

    [​IMG]

    Now let's take a look at the circuit diagram of the K2:
    [​IMG]

    There is a RFC from the center pin of the antenna connector to ground (= chassis). This is the case with most every transceiver. It has a value of 100┬ÁH. At DC this is just a short. At the lowest frequency where the transceiver operates (1.8 MHz), it is an impedance of Z = X_L = 2 pi * f * L = 1130 Ohms, at the highest frequency (28 MHz) it is 17.6kOhm. Parallel to the 50 Ohm (real) of the antenna, this reactance can be neglected. The path to ground practically doesn't exist for high frequencies.

    So if the transceiver works with normal output power, and the only concern you have is that you can measure 0 Ohms between the chassis and center pin, there is absolutely nothing to worry about.
     
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