Amateur Radio

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A Lemmy Community to share links about and for amateur (ham) radio to advance the technology, and promote communication and international goodwill. This community IS NOT for CB, GMRS, MURS, FRS, etc topics unless they are related to ham radio in some way.

We won't tolerate personal insults, illegal activity, or anything contrary to good amateur practice.

If asking questions about regulations, please include your country because we recognize that, while the hobby is international, regulations often aren't.

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TrojanHam

Build my first magnetic loop today, holy sh.. (sh.itjust.works)

submitted 4 weeks ago by LH0ezVT to c/amateur_radio

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My first magnetic loop for 2m :)

Really simple construction: bent ca. 2mm brass pipe soldered directly to the outside of an SMA plug, inside of the plug soldered to the red wire as "input coil". Tunable by squeezing the ends more or less close together.

SWR of <1.2 at resonance, not bad. Impedance is at roughly 44+j2 Ohm, also not bad for totally eyeballing it without any prior calculations.

I can reach the nearest 2m relais just fine at 2W, although to be fair I can do the same with a short whip antenna. More testing to follow. Holy shit, this actually works!

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[–] LH0ezVT 1 points 4 weeks ago* (last edited 4 weeks ago)

So, first actual test: The general sentiment is "a few S levels" higher than the original whip of my Anytone 878, with a notable directionality. I can talk to my friend from the other side of the city with just 2W as well. Great success! Also, it survived 7W for quite a while without getting hot. Although my fingers (I was holding it in the air) started tingling a bit ;)