#2104

[@romancharak3675]

Antenna of the day !

[@p1366]

You made my day! Antennas rock!

[@argoneum]

Back in the day took me a while to understand how it works. Mind twisting 😸

[@keithcookman2918]

Never seen you use SDR Devises and show their new advantages and disadvantages to RF design. Great content and projects, happy new year all.

[@IMSAIGuy]

kzbin.info/www/bejne/jKjbloN8rc52h8Usi=g_c-7esLx4RXVp1n kzbin.info/www/bejne/q52QkpKfnsiUqNEsi=bS5z90Pxhy1fEGbw kzbin.info/www/bejne/robSe5SAi5lrfaMsi=iv166w6wZ1JpuM1u kzbin.info/www/bejne/ap6yk6eko8-ZgLMsi=UCTcvzLIBJ4UGR90 kzbin.info/www/bejne/mqGlp2xjg7Oie9Usi=2Ia1nLlVr7xa5WjW

[@mikestewart4752]

I had a professor that kept calling these Helicoils. 🤦‍♂️ Helicoils are for spark plugs Pravin!!!

[@IMSAIGuy]

guess he never took shop class

[@SX1R]

Actually this antenna is for reception of radiosondes (meteorological balloons) like the Vaisala RS92.

[@JxH]

You sure? Internet says "The Vaisala RS92 radiosonde's frequency can be set between 400-406 MHz." This antenna is for 1.6 GHz; says so right on the PCB. And it's also really obvious by the size that it's not for 400 MHz. Somehow I knew that radiosondes are not normally found on 1.6 GHz, so I looked it up to see. Cheers.

[@Mooff2]

How are the two helices fed? Do they do the old trick where one is slightly oversized and capacitive and the other is undersized and inductive or do they do something clever with the strip lines on the circuit board?

[@JxH]

They'd either be in parallel, or a power splitter (not sure, I think the former). Edit to add: Looks to be in simple parallel. All four elements would definitely 'supposed to' be the same size and symmetrical.

[@richardockman5988]

Some call this an Egg Beater antenna.

[@JxH]

You'd want to make sure you ended-up with the correct polarization. I believe that RHCP is the goal for most applications. Hopefully the PCB design steers the assembler in one direction. Beware if you plan to add a reflecting dish, as that would flip things.