Home › Forums › temp › What do you use to relay your signal to a remote transmitter? › 5.8 GHz
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gronsk, et. al.,
I have used 27 MHz, 49 MHz, 900 MHz, 2.4 GHz, and 5.8 GHz cordless telephones around here over the years. The quietest unit is the 5.8 GHz phone, but it also has the spottiest coverage. If I am positioned so that the refrigerator is between me and the base unit, I lose the signal. The greatest range I achieved was with a 27 MHz unit with a 49 MHz back channel and that was about 300 feet using stock equipment.
At 5.8 GHz the signals tend to be line of sight and don’t bounce around obstacles and my phone does have several dead spots around the house. It could work well for line of sight outdoors but I don’t know that.
I have done experiments at 932 MHz with OEM tx and rx units using a 1/4 wave antenna (only 8 cm long) and have had good results with full quieting signals inside and outside the house up to 100 feet. I haven’t had a chance to go farther for testing. I have also used 10.5 GHz for doppler experiments and this, with a horn antenna, is very directive. Hams report reliable ranges on this X microwave band of up to 6 miles line of sight. I don’t know much about the part 15 restrictions in this band.
From what I have tried, the 900 MHz and 2.4 GHz bands seem to hold promise and they are both part 15 bands. The 900 MHz equipment I use is simple FM but I believe the digital phones at 2.4 and 5.8 GHz are both spread spectrum.