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clifford wright wrote in
: Good day all! My latest build is a version of the VK5BR noise cancellor. So far (using different toroid cores from those specified) I have got about 3 "S" points of noise reduction. I am expecting a shipment of cores from Amidon in the next few days and will try the final version with 2 FT50-75 cores as specifid in the later "Amateur Radio" article. Basically though I am quite pleased with it. It means more adjustments, but in a rural location, but with bad power line noise, it seems to help. FYI, Don't go by the "radio communication" circuit. It has several errors. Look up VK5BR's own site with all the corrections. It would be very intersting to hear of others experience with this gadget. Anyone else made one? Cliff Wright ZL1BDA ex G3NIA Well the unit is all operating now with the proper ferrite core transformers. Results vary with band but on 7 MHz I an getting about 20 dB reduction in background QRN. 14 MHz is not quite as marked but still about 15 dB. Quite worthwhile! But one has to remember that this circuit reduces the LOCAL noise background not ionispheric noise or QRM. Overall I would recommend it to those troubled by electrical noise. However I do have some reservations about the Low Q chokes used as front end tuned circuits. I suspect that the phase shift one needs is not as accurately obtained and it might work better with some high Q toroids in their place. That will be tried next as soon as they arrive. Another thing- Does anyone know of a source of adapters from surface mountto DIL IC's. This is becoming more and more necessary as newer chips are NOT being produced in DIL packages. I've had a lot of trouble with a motor controller chip for an electric bicycle which was 24 pin Surface mount only. Clifford wright ZL1BDA ex G3NIA. |
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