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FDM-S2 Frequency Calibration
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Mike Chace-Ortiz
Evening All
Just taken delivery of an FDM-S2 which is about 80Hz high at 10MHz. The manual is less than helpful about correcting this kind of error which does matter when you’re listening to STANAG4285 and other digital signals. Is there a way that I can do the correction while watching a 1kHz tone from WWV for example? I do remember doing this on the older versions of s/w but the current version (3.55) seems to be different from what I remember previously. 73 —mco |
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Mike Chace-Ortiz
Followed advice of user linkz.
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After leaving the RX on for an hour to stabilize, tuned to WWV on 9,999kHz and measured the 1kHz carrier using Code300’s spectrum (Fldigi or anything else will do) which was at 1083Hz, so 83Hz high. Right click on waterfall and choose Frequency Calibration, clicked “Set Offset" then entered -83, saved and exited. Back on frequency. 73 —mco On Mar 22, 2023, at 8:27 PM, Mike Chace-Ortiz via groups.io <mchaceortiz@...> wrote: |
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daiche <daiche@...>
Hi Mike!
You can +- a decimal amount to the whole number, to fine tune the calibration result if you like (ie -82.8 or -83.4). I remember that process now! 73 Dave Aichelman N7NZH Grants Pass, Oregon |
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