Xiegu G1M Longer range coms on a budget

[Lightspeed]

(3 February 2021, 21:56)Mick Wrote: As a matter of interest, can radio transmitters of all kinds have adjustable ranges?
For example if you want to transmit to somebody who's say only 10 miles away, can you set the range to 10 miles so that nobody with a receiver beyond that range can eavesdrop on your conversation?

Also, can radio beams be "pointed" in a specific direction? For examp if your receiving pal lives in a specific area could you direct the beam at that area so that anybody outside the beam wouldn't be able to eavesdrop?

Hard to limit range other than decreasing power Mick. At times even that doesnt work

Yes directional "beams" are viable. Combined with reduced power this can be quite effective.

In your 10 mile scenario ( quite a difficult challenge actually... much easier to reach 70 - 1000 miles) A power adjustable Ultra High Frequency radio into a Yagi beam antenna would work quite well and the antenna would focus energy in the direction you point it, implicitely reducing transmissions in unwanted directions