MARCA FMT Challenge April 2026
Congratulations to Paul, KD7KDO; Joe, W7LUX; and Jeff, WA6TPO
Honorable Mention to Norm, AA7OO
Actual Radio Frequencies (Hz):
80m 40m KD7KDO delta
K5CM 7,064,124.77 -0.12
W8RKO 7,065,103.30 -0.48
K5CM 3,598,456.16 -0.03
W8RKO 3,599,077.20 -0.15
80m 40m KD7KDO delta
K5CM 7,064,124.77 -0.12
W8RKO 7,065,103.30 -0.48
K5CM 3,598,456.16 -0.03
W8RKO 3,599,077.20 -0.15
Method: IC7300, FLDIGI, RIGOL-DG1022, WWV
Actual Radio Frequencies (Hz):
80m 40m W7LUX delta
K5CM 7,064,124.77 -0.04
W8RKO 7,065,103.30 -0.37
K5CM 3,598,456.16 0.11
W8RKO 3,599,077.20 -0.11
80m 40m W7LUX delta
K5CM 7,064,124.77 -0.04
W8RKO 7,065,103.30 -0.37
K5CM 3,598,456.16 0.11
W8RKO 3,599,077.20 -0.11
Method: IC-735 ProII, Z3801, HP3325A
Actual Radio Frequencies (Hz):
80m 40m WA6TPO delta
K5CM 7,064,124.77 -0.22
W8RKO 7,065,103.30 -0.3
K5CM 3,598,456.16 0.16
W8RKO 3,599,077.10 -0.1
Method:
80m 40m WA6TPO delta
K5CM 7,064,124.77 -0.22
W8RKO 7,065,103.30 -0.3
K5CM 3,598,456.16 0.16
W8RKO 3,599,077.10 -0.1
Method:
Used Fldigi OpMode Frequency Measure.
1) Used Bodnar GPSDO to calibrate FTDX101D VFO
error on 80m and 40m by setting VFO 1kHz lower
than GPSDO and averaging 1min, calc
GPDSO - VFO for rig error.
2) Use GPSDO for nearby reference during runs,
measured unknown freq. Add VFO error."
1) Used Bodnar GPSDO to calibrate FTDX101D VFO
error on 80m and 40m by setting VFO 1kHz lower
than GPSDO and averaging 1min, calc
GPDSO - VFO for rig error.
2) Use GPSDO for nearby reference during runs,
measured unknown freq. Add VFO error."
Actual Radio Frequencies (Hz):
80m 40m AA7OO delta
K5CM 7,064,124.77 2.23
W8RKO 7,065,103.30 4.74
K5CM 3,598,456.16 7.81
W8RKO 3,599,077.20 -10.31
80m 40m AA7OO delta
K5CM 7,064,124.77 2.23
W8RKO 7,065,103.30 4.74
K5CM 3,598,456.16 7.81
W8RKO 3,599,077.20 -10.31
Method:
"Radio: IQ2 SDR; Antenna: Scorpion 80m-6m vertical;
Radio Software: HDSDR; Calibrated both IQ2, HDSDR,
and PC clock prior to and after FMT.
Calibration source with WWV 20Mhz and GPS Displined
Clock. Calibration Correction was the same for both
calibrations; 4.08hz.
Software that locked onto
""Center Frequency"" of FMT Intro, Key Down,
and Closing. Data points were recorded at 0.1hz.
At the same time locked on and tracked the Audio
Track of Carrier. The deviation of the data points
within 10hz for each track. The logged frequency
tracks were then averaged to 3 places. The audio
track AF deviation and RF deviation tracked.
This is a mathematical calculation of data points,
not a direct measurement.
Submitted FMT frequency as computed."
"Radio: IQ2 SDR; Antenna: Scorpion 80m-6m vertical;
Radio Software: HDSDR; Calibrated both IQ2, HDSDR,
and PC clock prior to and after FMT.
Calibration source with WWV 20Mhz and GPS Displined
Clock. Calibration Correction was the same for both
calibrations; 4.08hz.
Software that locked onto
""Center Frequency"" of FMT Intro, Key Down,
and Closing. Data points were recorded at 0.1hz.
At the same time locked on and tracked the Audio
Track of Carrier. The deviation of the data points
within 10hz for each track. The logged frequency
tracks were then averaged to 3 places. The audio
track AF deviation and RF deviation tracked.
This is a mathematical calculation of data points,
not a direct measurement.
Submitted FMT frequency as computed."