Total posts : 45366
The really weird thing is that the audio
sounds quite good, although I will
remember both of your suggestions.
Just to test the range of the 49.83 MHz
transmitter, I hung a little two foot transmitting
antenna off of the RF out. I went down the
street with an ICOM R2 scanning receiver.
The transmitter is on the first floor of my house.
The range was at least 500 feet, but then I
started to hear interference from another signal.
Having no desire to listen to this signal, I turned
around and walked back home.
A lot of people have said that the 49 MHz range
is pretty devoid of baby monitors, but I think there
still might be quite a few around.
My main objective is to get an FM solar powered repeater
running. I would like to get these units between
the 49.83 and 49.845 channels. There might be some
way to shift the frequencies slightly with some small caps
in parallel or series with the crystals. If not, I can do
the math and put in some other crystals. Still, I don’t
know if 7.5 kHz away will really make a difference as far
as interference is concerned. And if 49 MHz isn’t practical,
there are other Part 15 frequencies that can be tried.
Well, anyway, the next step is to get the thing outside
in a package and put it in the sun and see how much
sun it needs to repeat the signals. I have to get some
more solar cells first.
So thanks again SWCIS and Carl. I will keep you guys