Technical, Techniques, Hints, and Tips > Radio Equipment
Old Micron data request...
dodgy geezer:
Are you saying that the resonant circuit will probably work over a wide spread of inductances, but will not provide much power unless it is optimised quite precisely? I can't see how that matches with the circuit notes, which seem to indicate that so long as the oscillator is running the precise core position is not critical.
Doing a range check would give a definitive answer, of course. If this Toko 10k produces detectable RF I am inclined to put the PCBs into the Tx and see if I can get the set to talk to a receiver...
dodgy geezer:
The ferrite core arrived this morning, so I put it in and powered up the RF board with a Futaba AM crystal. I used the diode/cap/multimeter circuit to detect RF.
The first thing that I noticed was that I seemed to detect some mV on pretty much any bit of metal, which varied along it's length, making any precise measurement difficult. Next I tried a working Micron Tx, and could definitely see a jump when I turned that on.
Then I tried the RF board, with a crocodile clip to a partly extended aerial. I was running off 6v rather than 9.6v, but I could detect a small jump on power-up, even when the slug was almost completely out. I got a bigger reading (though still much less than the working Tx) as I wound the slug in, and there seemed to be a slight peak at a point where the slug was 1.5mm out of the coil.
I'm not sure how to interpret this. The inductor seems to be working, and the low output can be explained, at least in part, by the lower voltage and non-resonant aerial length. Since this is the only slug that remotely fits the coil that I can easily source, (it's a little bit loose, but the threads do connect) I'm inclined to assemble the whole Tx and do any further mods on the complete system...
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