There are many very nice but difficult and expensive paraset transceivers to build, so I made a paraset for the poor spy.

Here the result of the experiment:



Pictures:








Schematic is a clon of the "Easy ten transmitter" from here: www.sparkbangbuzz.com/easy-ten/easy-ten.htm

Very good !)

Good stuff for a scout.

Congrats Emilio! Very nice spy TX, indeed. I wonder, where is the antenna socket in the book?

The level of the last century.

Antena connect on the top of the book with copper sheet (Flex from broken camera):





72

I guess, the power output is 10...20 mW approximately. You can increase the power if add RF choke instead of 1 kOm resistor and add Pi-network from collector to antenna. I've got about 50-60 mW with 9V battery on this TX scheme I love QRP-X power very much! (less than 100 mW). My personal results are 58 Countries and ODX 6092 km distance. Enjoy it!

I try add the choke... the pi network no reduce power?, and other question... if put a GND with the original Ten Transmitter circuit the oscillation stop, whay is that? (i think is some match impedance issue) you have some idea?.

Thanks!!

Dear Emilio, The good chocke and pi-network did not reduce the power. Backward, it increase output, sure.
To fix the oscillation stop you can to match .001 cap and 100 kOm res carefully. Me, I don't like your scheme, it's not steady and stable oscillator. I'd like to recommend classic scheme with two cap's in feedback between base, emitter and "ground" points (see my QRP-X TX above). No any problems with oscillation with it.
Wish you only the best Emilio!