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Inductance Meter
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Ashhar Farhan
the VFO of BITX20 has an interesting story. it is actually my inductance
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meter! looking at the VFO, if you removed the trimmer, it becomes a test oscillator that iuse at all times. this idea is due to W7AAZ (Bill Carver). you can quickly assemble a frequency counter like one of the several shown by Hans. To measure an inductance, solder the the coil into the VFO circuit, measure the frequency. The capacitance is well established, from there calculate the inductance. i had written a few lines code in C (i think it is posted it its entirity on rec.radio.amateur.homebrew). that helped me calculate it quickly. the test oscillator also works as acrystal oscillator (solder a crystal in place of the coil) to measure and match the crystals. - farhan On Sun, 4 Jul 2004, Charles wrote:
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Hans Summers
Following Farhan's mention of my frequency counters...
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this one is a full 8-digit counter. On the other hand, you can throw together something really fast with 8=LED binary readout and only 2 chips: This reads only 0 - 99.5KHz, the MHz and 100KHz aren't shown. However, please note that is is quite easy to fit a switch to select a different division of the timebase, in order to obtain a MHz reading. Look at the website of Onno PA2OHH whose ideas my counter is based on. 73 Hans G0UPL -----Original Message-----
From: Ashhar Farhan [mailto:farhan@...] Sent: 05 July 2004 03:01 To: Charles Cc: BITX20@... Subject: Re: [BITX20] Inductance Meter the VFO of BITX20 has an interesting story. it is actually my inductance meter! looking at the VFO, if you removed the trimmer, it becomes a test oscillator that iuse at all times. this idea is due to W7AAZ (Bill Carver). you can quickly assemble a frequency counter like one of the several shown by Hans. To measure an inductance, solder the the coil into the VFO circuit, measure the frequency. The capacitance is well established, from there calculate the inductance. i had written a few lines code in C (i think it is posted it its entirity on rec.radio.amateur.homebrew). that helped me calculate it quickly. the test oscillator also works as acrystal oscillator (solder a crystal in place of the coil) to measure and match the crystals. - farhan On Sun, 4 Jul 2004, Charles wrote: Hi all |
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