Naracoorte back on and possible solution to noise

Two hard working people today.

  1. Ross VK3KBO has put up a temporary link antenna at Naracoorte and the link has been turned on. Things need to be working well again. Well done Ross – a high gain home brew 10 element beam is doing the job very nicely. Great to have the whole network back on again
  2. Peter VK5BE has been busy too. He grabbed one of our spare cavities from the clubrooms and tuned it up as a band pass filter using his tracking generator/spectrum analyser. The idea being to cut out harmonics from the 146.9MHz transmitter on the basis that maybe the mixing products we have been experiencing are related to a harmonic mix. The first harmonic at 293.8MHz is now filtered out by at least 40db and higher harmonics even further down. Peter installed it at The Bluff today (8/4/21) and so far so good, no noise. Have we spoken too soon! Thank you Robin for being the testing station from the Mt Gambier end. We’ve lost a little output power but if that means no noise I think we can tolerate that.

Update: Spoke too soon. Still having noise problems, maybe, just maybe, not as bad. Seems OK on weekends but weekdays are a different matter.

The temporary link antenna at Naracoorte built and placed by Ross VK3KBO. Network all working again.
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