Problem :- A 1000 metre length of plastic ducting 14mm o/d and 10mm i/d has been laid around my paddock in a trench 600mm deep and back-filled. This has to run around buildings, trees etc. for the first phase of laying a fibre optic cable. The ducting has to be jointed with compression plastic fittings - 15 in total- and the installers have not been too careful in their work in tightening them, with the result that the i/d has reduced from 10mm to 8mm. Because of the undulating duct lay, a measuring line cannot be used, as when the linear length above ground is measured , the submerged length could be anywhere up to 15 metres longer.
In an earlier posting of Colpitts oscillators and answered by dananak with the ref heading number of 150002/ ( his/her was the second reply ) I shall be using the single transistor CO that he suggested which looked less complicated to build and it all has to fit in a 10 mm i/d pipe !! - complete with batteries ( eight button cells in series).
Questions :-
1.......Will a single transistor oscillator, supply sufficient radiated power to be received on an ordinary VHF 88-108 MHz domestic radio when one is directly above the transmitter, which will be 600 mm below and covered with soil ? - I know I am asking a lot of you all to answer that one, but a vague guess would be most helpful !!.
2........As I require a "blip-tone" every second upon approach to, and the passing past the TX reference, I thought of a aged old friend - the 555 timer - would be splendid to replace the mic. but would the o/p just be AC coupled onto the base of said transistor,or is that too easy ? .
At 79 years old any assistance would be deemed most helpful, as I can still build the odds and ends, but my 27 year old Grandson is getting a trifle peeved at digging the holes !!,
Stay well and safe all of you,
Kind regards,
Hopeful!
In an earlier posting of Colpitts oscillators and answered by dananak with the ref heading number of 150002/ ( his/her was the second reply ) I shall be using the single transistor CO that he suggested which looked less complicated to build and it all has to fit in a 10 mm i/d pipe !! - complete with batteries ( eight button cells in series).
Questions :-
1.......Will a single transistor oscillator, supply sufficient radiated power to be received on an ordinary VHF 88-108 MHz domestic radio when one is directly above the transmitter, which will be 600 mm below and covered with soil ? - I know I am asking a lot of you all to answer that one, but a vague guess would be most helpful !!.
2........As I require a "blip-tone" every second upon approach to, and the passing past the TX reference, I thought of a aged old friend - the 555 timer - would be splendid to replace the mic. but would the o/p just be AC coupled onto the base of said transistor,or is that too easy ? .
At 79 years old any assistance would be deemed most helpful, as I can still build the odds and ends, but my 27 year old Grandson is getting a trifle peeved at digging the holes !!,
Stay well and safe all of you,
Kind regards,
Hopeful!