Category Archives: FMT

First Practice FMT Run

Posted on December 1, 2017 by robert

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?

Posted on November 26, 2017 by robert

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?

Posted on November 26, 2017 by robert

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

Posted on November 14, 2017 by robert

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

Posted on November 11, 2017 by robert

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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