VE4BRE Brendan

53 Followers
32 Following
32 Posts
Amateur operator since 2023. Mainly interested in DIY, open source, low power, and cheap radio projects and modes.
pronounshe/him
callsignVE4BRE
@harvestmalletus I hope it works out! I'm a frequent user of Noctua fans. I expect it'll be nice and quiet, at least.
@harvestmalletus the amount of airflow in each area of the case is going to change significantly with a reversed fan. This could lead to hotspots you didn't have before. I'd go with the original direction on the assumption that the original direction worked well enough.
@G8RKE I wouldn't do it in any logbooks used for awards, but as long as it doesn't become an excuse for using excess power, I don't see any problem with it.
@VE3RWJ @va3db if all you can measure is SWR, you can at least confirm that the SWR is extremely high outside of the antenna's design frequency. If it's low everywhere, it's unlikely that it's being radiated. Radiation resistance is the thing that changes a lot with frequency in most antenna designs, so when it's the major part of the "return loss" (low SWR), it'll swing up and down a huge amount. If it doesn't swing, it's probably losses to something else.
@DJ5CW I built a similar filter using spare toroids as transformers, and your circuit seems to have ended up with better insertion loss. I say: well done!
From junk, I've made a neat looking l-match for an end-fed half-wave antenna. In the centre, there is a capacitor made of copper foil tape on either side of a piece of 0.6mm thick PET that I cut to fit inside the pill bottle. I expect it'll tolerate about 20W from the transmitter as long as it's matching.
#amateurradio #hamradio
@kelvin0mql I'd look at RONJA (http://ronja.twibright.com/) for some ideas for the optics. If you're trying to bounce off a lossy surface, you'd probably need bigger apertures.
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This is advanced menu for Twibright Ronja Optical Datalink Project, a FSO device realized as free technology.

Made a somewhat usable bandpass filter for the 30m band mostly using spare parts. It has about 10db of insertion loss (I should have wound the transformer windings atop one another instead of side-by-side). I seem to be able to compensate for that with my sdr's gain, at least. I've got it centred on the qrss area. #amateurradio #QRSS
@N3VEM building and flying kites can be a lot of fun.
@ejo60 ah yeah the 991 also works