TAARC – GDO Talk Apr 2018

Tuesday the 17th of April 2018 saw Steve G4HXY give an excellent talk to members of Thurrock Acorns, on the subject of using GDOs – Grid Dip Oscillators.

These are surprisingly useful bits of kit, and Steve showed a traditional GDO, and a slightly more modern counterpart. If you’re not familiar with GDOs, these are meters that allow you to work out the inductance, if you know the frequency and capacitance – great for making a stub, or checking the trap in an HF dipole. They can also be used as an absorption wavemeter, allowing you to check if your transmitter is radiating in-band, and it can also test for harmonics.

As we all know, we’re required to test our RF emissions “from time to time”, and the wavemeter is a great way to do this.

Steve G4HXY demonstrating a GDO, assisted by Gordon M0WJL
Steve G4HXY demonstrating a GDO, assisted by Gordon M0WJL

These handy bits of shack test equipment pop up regularly at rallies, so keep an eye out!

Want to know more? See Grid dip oscillator on Wikipedias

After Steve’s talk, the new Chairman of TAARC, Paul G4MJM, gave a short update on a few items and announced a member’s survey to help him explore what’s next for the Acorns.

Steve G4HXY (left) and new Chairman Paul G4MJM (right)
Steve G4HXY (left) and new Chairman Paul G4MJM (right)

As always, a very friendly night, and the chance to see a happy ham with a new radio!

Dorothy M0LMR, very proud of her new Baofeng dual-band DMR
Dorothy M0LMR, very proud of her new Baofeng dual-band DMR

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