Posted by
Edward R Cole on
Oct 30, 2011; 5:34pm
URL: http://elecraft.85.s1.nabble.com/New-K3EXREF-results-tp6945983.html
See my test results of the K3EXREF:
http://www.kl7uw.com/K3EXREF.htmWhen installed and referenced to a good 10-MHz external source the
TCXO will be periodically corrected in frequency to keep the K3 on
frequency. The display on REF*CAL merely indicates the value the
TCXO has been offset to keep the radio on frequency and is not the
freq. error. You need to measure the RF frequency with an accurate
freq. counter to measure that. I have a counter that is locked to a
Rubidium good to +/- 5E-11 and the max error at 50-MHz was +2-Hz (2/50,000,000)
The value displayed on REF*CAL will start at 49.380 and they shift
over about 30-minutes as the TCXO heats and stabilizes. K3EXREF
keeps the radio on freq throughout this warm-up. Without K3EXREF the
radio would shift freq with the TCXO (within 1ppm = +/-1E-6).
Before the K3EXREF was available you had the option to entering a
fixed offset to correct frequency (which should be done after the
TCXO has warmed up and stabilizes). The number displayed is a
similar offset but now controlled periodically by the external
reference source, keeping the K3 more accurate.
73, Ed - KL7UW, WD2XSH/45
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BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
DUBUS Magazine USA Rep
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