Translation:RF-Head wrote: ↑Tue Aug 16, 2016 8:50 am@ Mixin,
Here a PDF that i made a few years back for the old website fmzenders.com
There is a picture of a stentor made on your PCB
This is the PCB from the original 80s production line
Also the schematic and some text about the stentor (only dutch)
Please let me know if you need more info
The Stentor came on the market around 1983 and that made it possible for anyone who wanted to broadcast on the FM Band, with all the consequences that entailed! In fact, so much has to be changed to this circuit for it to be good enough, that a different transmitter is preferable to this Stentor. It was also called "the disturbance" and "a lot of power for little money" for a reason. Out of nostalgia and for those who still have one lying around, I feel that I had to post this diagram, but again, it actually caused the "disturbance" complaints to increase and the FM Band became quite sick at the time!
* Connect a stable voltage source, cutting the oscillator supply to 9 volts with a 7809 regulator IC, and the remainder with 7812 to 12 volts.
* Always decouple the voltages on the "plus" properly and use RFCs.
* Include screens of PCB material or tinplate between the three stages and install the transmitter in A PCB material or tinplate box
* Connect a good filter and do not connect any further amplifier.
* Use a good antenna with a good radiation pattern, and good match, so don't just connect a dipole to the end of it!