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walid

100 uH coil

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Hi Staigen,
Didn't you see my FM transmitter? I found some tiny variable caps to tune it, it has a low-distortion preamp with proper selectable pre-emphasis, the preamp and oscillator have a low-dropout regulator, it has an RF amplifier/buffer so that it doesn't change its tuning if something gets near the antenna and its range is more than about 2km. My FM band is full, so to test it I had to use the same frequency as a foreign-language low-power station on the other side of my city. ;D 

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To Audioguru
Yes, i have seen it before, here on the board, a nice little thing, built on a wero and all! Nice! ;D ;D
BTW, have you notice my message(question)?

To Alun
I agree with you, suddenly not 100uH!

//Staigen

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Our 3W FM transmitter project uses a few RF chokes and tells how to make them:
http://www.electronics-lab.com/projects/rf/016/index.html

One of our 4W FM transmitter projects also uses RF chokes but its translation is difficult to understand.

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I go to the 3W FM transmitter project which uses five RF chokes==>

L2,L3,L5,L7,L9  5  6-hole Ferroxcube Wide band HF Choke (5 WDG)

but i can't understand anything from this "6-hole Ferroxcube Wide band HF Choke (5 WDG)"
can you explain?
thanks

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I guess the ferrite core is a Philips one with 6 holes for the wire to loop through and has 5 turns of wire in it.
Entering Ferroxcube in Google linked to a site by Ferroxcube. They have a few of these cores and the ones with the highest inductance resonate below 100MHz. Here is a good one:

post-1706-14279142410416_thumb.png

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