what do these antennas do?

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lohtse
Posts: 1
Joined: Fri Apr 30, 2021 10:35 am

what do these antennas do?

Post by lohtse » Fri Apr 30, 2021 4:17 pm

Hi all

Very new too all this(2hrs old at time of posting) have got one of these. https://www.nooelec.com/store/sdr/sdr-r ... artee.html

have the software up and running and seems all ok.. My question is what os the purpose of the three anntenas??

How best would I use them?

thanks in advanced

regards
lohtse

joe36
Posts: 53
Joined: Wed Jul 20, 2016 11:09 pm
Location: Cass co. in. 46994

Re: what do these antennas do?

Post by joe36 » Wed May 05, 2021 9:08 pm

The 2 antennas with the coil in the middle are fixed frequency. The telescopic antenna can be use in the shortest collapsed configuration for higher frequencies. Say it is 8 inches long collapsed.
The resonate 1/4 wave frequency would be around 300 MHZ extended to say 3 foot it would be resonant at 78 MHZ. So this antenna as described would work well from78 to 300 MHZ.
This does not mean that a non resonant antenna will not receive. A antennas made of 1 inch of wire can receive from DC to many GHZ. It will not do nearly as well as a proper antenna.
There are many on lie calculators if you search “ antenna length calculators”.


Joe

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