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things said:do you know of any shop in australia you can get that inductors?
bananasiong said:If a RF NPN transistor is used to amplify the modulated signal, with a resistor for the collector load, will the gain be high?
things said:with that rf amp posted by audioguru how do you know it's working and what does the variable capacitor do change frequency or what?
how far is the range if you know?
audioguru said:I just noticed that your flea-powered kit transmitter operates from only a single 1.0V to 1.5V battery cell!
So I have modified my RF amplifier to work on such a low voltage.
The RF amplifier might not make any difference or it might extend the range to twice as far.
which of the many lousy FM transmitters in this thread is the "flea powered " one? The one with the obsolete BA1404 IC?I love the idea of this flea powered TX cct.
A few questions please..
- I have 4.5Volts to play with and a power budget of 50mA. How could I make this TX as powerful as possible? I'm using it in the middle of the desert in Australia, so interference is just NOT an issue, I would not do such a thing in suburbia.
No.2) Also, TX Freq is set by LC values etc I see, and it will drift with temp, is there any way I could 'easily' incorporate a XTAL or other 'simple' circuit to make it more stable?
A few milli-watts.3)What would the actual transmitted power be at TX frequency? in mW if possible.. how would I look at the circuit and calculate this? I am RF electronics trade qualified, just been out of the game for years. appreciate a refresher.
The Micromitter is much better and is much more modern.4)Generally.. wondering how something like this would go against the micromitter chip( Micromitter prject URL ).. in terms of power budget, RF out and stability. The Micromitter does look quite compelling.
No.how about those 315Mhz modules? Are they susceptible to frequency changing if anybody gets near it?