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TX and RX Frequency Difference #40m
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Ernie Bailey - N2DGQ
I have just completed my QCX Mini Build for 40M. The RX and TX Freq seem to be off by about 80Hz. For example, I TX on 7.115.20 and RBN says I'm at 7116.00. The delta is consistent no matter where I go on the band. Do I need to tweak the reference frequency or is this normal operation for the QCX Mini's?
Thank you in advance for your helpful feedback. |
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George Korper
Hi, Calibration by GPS will correct this. Did you purchase the QLG2 SE GPS accessory. I can't help you with manual calibration. I'm sure other posts will follow. The GPS option is critical for Beacon mode and WSPR. It turns the Mini into a real powerhouse, and each software revision has made it better! |
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Hi Ernie. If you have the 27 MHz reference crystal in there, and if you don't have a GPS, try setting your reference frequency to 27,007,036 and see if that helps.... You are actually 800 Hz off per the numbers you mentioned. Good luck ... Ron On Mon, Feb 14, 2022 at 4:02 PM George Korper <georgekorper@...> wrote:
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Ernie Bailey - N2DGQ
Ron and George,
Thanks for you for thoughtful input. I do not have a GPS. Setting the ref freq. at 27,0047,036 worked. If I may ask, what is the math you used to calculate the new ref. freq.? |
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(Measured F / Displayed F) X (Current Reference F) = New Ref F (7116000 / 7115200) X (27,004,000) = 27,007,036.2 Glad it worked. 73… Ron On Mon, Feb 14, 2022 at 15:25 Ernie Bailey - N2DGQ <ebrcdddcdc@...> wrote: I have just completed my QCX Mini Build for 40M. The RX and TX Freq seem to be off by about 80Hz. For example, I TX on 7.115.20 and RBN says I'm at 7116.00. The delta is consistent no matter where I go on the band. Do I need to tweak the reference frequency or is this normal operation for the QCX Mini's? |
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