Category Archives: FMT

“Green Band” April 2018 FMT!

I managed to fulfill one of my 2018 goals by getting into the “Green Band” of the ARRL FMT.  The standard is to be better than 1 Hz on all three bands.  My best result was within 0.010 Hz, and … Continue reading

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Warming Up for the FMT

2018’s first FMT is scheduled for 0100-0225 UTC on April 6 (9 PM-10:25PM EDT Thursday).  It’s been many months since I’ve fiddled with my measurement gear, so today it was hooked up and will be left powered on so that … Continue reading

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First Practice FMT Run

A good friend of mine, John WA1ABI, is responsible for planting the FMT bug in my head.  I’ve been admiring his results in the ARRL FMTs for years — he is constantly an outstanding performer.  John graciously suggested that we … Continue reading

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Can You Trust Your RX For a FMT?

My go to ham rig is my K3s, which includes the KTCXO3-1 Temperature Compensated Crystal Oscillator, a device specified to maintain 0.5 to 1 PPM,  One might think that in a reasonably controlled environment that the K3s could be used in CW … Continue reading

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So How Far Off is Your Soundcard?

I am starting my journey into the world of Frequency Measuring Tests.  I decided to use my receiver in AM mode and compare the unknown frequency to a known frequency obtained from a HP3335A (locked to a Rubidium source) that … Continue reading

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Restoring HP3335A Part 2

After cleaning the synthesizer inside and out, I replaced multiple screws that were missing from the internal metal frame, and bolted down the power supply, which was obviously replaced in the past (without putting it back in properly).  Despite the … Continue reading

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Restoring a HP 3335A to full operation

I’ve always been sort of a time nut, but that’s pretty closely related to frequency.  The ARRL helps to sponsor a periodic Frequency Measurement Test, usually held in April and November.  A good friend of mine, John WA1ABI, always participates … Continue reading

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