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okay i used the flashlight bulb and it lit up quite nicely.... I will build the receiver in a week or so and share the results and probably would ask for help as well :twisted:; the delay is because of my in-session exams.....
I measured a consumption of around 3Watts (0.25Amps @ 12Volts) by the transmitter. the led lightened up quite brightly when i placed it across the pi-network output......
the thing is that i am getting a peak of 27MHz at output (collector of last transistor) without the pi-network but after the pi-network gets connected to circuit and when i place the probe of on the output of this pi-network is at 6MHz...... why is it so?? is it really that the 1.2nF is wrongly...
I am a bit confused with the pi-network..... I couldnt find variable caps for this large value in nanofarads.... only found trimmers at certain pico's.... The pi-network calculation require the output impedance of the amplifier to match it with my 50-ohm impedance at the end.....
I still havent...
Sir i checked some designs on the net and it seems like all those had Q1 base capacitor in micros.....
**broken link removed**
http://jap.hu/electronic/sregrcvr.html
but then i found a design which had the capacitor values in nano:-...
then plz help me make modifications in it! And yeah capacitor at the collector value was 100nF..... my mistake! I will check on the Q1 base capacitor!
thanks.....
So sir are you saying that the transmitter is working as it should have been considering the above readings i posted??
I am still getting a count of some 8-9MHz at the output of pi-network!
uptill now i was giving this transmitter power from a 6Volts/ 1Amp battery to inhibit any heating of the...
is it that the last stage is interacting with some other stage or is it all okay and it will work?? Should i proceed with building the receiver?? if not, then what should be the next step b/c i am pretty confused now!
i followed the instruction from borber regarding the trimmer capacitors! I placed a 6.8-45pF trimmer cap across the 1uH inductor (at the third last stage), then 4.2-20pF (Second last stage) on the 2.2uH and 5.6uH (last stage of 2N3866) ones.....
I also tuned them to maximum peak values (with RF...
okay i understood the tuning part. I think you wanted to say that by poking the RF diode probe into the RF circuitry somewhere on the output side of the transmitter stage (or anywhere on the amplifier stages) you need to tune and tune for the maximum meter reading.....
On the second part plz...
okay but not all the stages in my circuit had LC tanks :???: only one had...... from the above quote all i understand is have a trimmer capacitor on the LC tanks to tune them........ my questions still remain unanswered sir!
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