[Elecraft] [K3] KXV3A fails 1 mW calibration

[Pierfrancesco Caci]

Thanks for this info. Now, please pardon my total ignorance in using
these instrument. If the scope has an input impedance of 1 Mohm, do I
still need to use the probe, or can I just use the BNC T ? I have the 50
ohm dummy on the other side of the T of course. 
With the scope directly connected, I read slightly over 600 mV peak to
peak. Should be almost there, right?

Pf




>>>>> "Gunnar" == Gunnar Widell <sm3sgp at kkn.net> writes:


    Gunnar> I also have the same problem. I got this information from Elecraft 
    Gunnar> support, but I have not been able to test yet since the radio is remote 
    Gunnar> (Running K3 Twin with Remoterig). See below:

    Gunnar> Connect a bnc tee to the XVTR OUT jack, and a 50 ohm load or resistor to 
    Gunnar> one side of the tee.

    Gunnar> Then use an RF probe to see if there is at least 0.224Vrms at the other 
    Gunnar> side of the tee. You could use an oscilloscope to do the measurement 
    Gunnar> too, but convert 0.224Vrms to peak to peak voltage for the scope.

    Gunnar> Use Tune if the K3 Utility automated TX Gain calibration does not work.

    Gunnar> Also, have a look in the manual, "Calibration Procedures" 1.0 Milliwatt 
    Gunnar> Meter Calibration.

    Gunnar> 73 de Gunnar SM3SGP @ SK3W

    Gunnar> Robert Bajuk skrev 2012-02-12 18:51:
    >> I do have the same problem with TX Gain Calibration, 5w and 50w calibration
    >> goes well, but 1mW calibration fails, I am getting the error something
    >> like: "Power set to 0.1 mW, 1.9 MHz,  TX gain calibration failed because
    >> transmit power did not reach the expected value".
    >> 
    >> I did reload FW, EE INIT, settings restore, nothing helps.
    >> 
    >> KXV3A is enabled and set to normal in config, no jumpers on W1 and W2, 50
    >> Ohm dummy load on XVTR Out is OK. XV144 does not work properly, I believe
    >> that is connected with XVTR Out problems. XVTR parameters in config are set
    >> correctly.
    >> 
    >> Any ideas?
    >> 
    >> 73 Robert
    >> 
    >> 2012/2/12 Don Wilhelm<w3fpr at embarqmail.com>
    >> 
    >>> Did you forget to cut the jumpers when you installed the KXV3A?
    >>> 
    >>> 73,
    >>> Don W3FPR
    >>> 
    >>> On 2/12/2012 11:22 AM, Pierfrancesco Caci wrote:
    >>>> I get the following error when trying the 1 mW calibration for a freshly
    >>>> installed KXV3A:
    >>>> 
    >>>> Starting 1 milliwatt calibration.
    >>>> Calibrating at 1.900 MHz
    >>>> IsSamplingComplete: Unexpected response 'DB 0.10 MW;' to ''. State 220
    >>>> Calibration power settled at ' 0.10 MW;'
    >>>> 1 milliwatt calibration failed.
    >>>> Elapsed time: 19.2 secs
    >>>> 
    >>>> 
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-- 
Pierfrancesco Caci, ik5pvx