FM transmitter does not work on breadboard

[chriswilliams]

I have armed an FM transmitter on breadboard but for some reason it
does not work. I have checked wiring and components and all seems to
be OK.
Thanks in advance for any comment

 

[BobG]

I have armed an FM transmitter on breadboard but for some reason it
does not work. I have checked wiring and components and all seems to
be OK.

=================================
'Armed' is a funny word to use. Like 'Cocked'... like you have a static
hi or lo level on the tx line. You need to hook it to a TTL level
serial port sending ASCII 'U' over and over at a slow baud rate like
1200 baud. Should be able to see stuff coming out of receiver at same
rate!

 

[Christopher]

Hello Chris,

I have armed an FM transmitter on breadboard but for some reason it
does not work. I have checked wiring and components and all seems to
be OK.

By breadboard you mean one of those white plug-in proto boards? One
area of trouble I found is the many rows of plug in contacts behave
like 5 pf capacitors shorting out the RF. Use a generic copper pad
perf board and solder.

Good Luck,

* * *
Christopher

Temecula CA.USA
http://www.oldtemecula.com

 

[Eeyore]

I have armed an FM transmitter on breadboard but for some reason it
does not work. I have checked wiring and components and all seems to
be OK.

What style of RF construction did you use ?

Graham

 

[chriswilliams]

What style of RF construction did you use ?

It's a simple FM transmitter with three transistors and an oscillator.

 

[Don Bowey]

I have armed an FM transmitter on breadboard but for some reason it
does not work. I have checked wiring and components and all seems to
be OK.
Thanks in advance for any comment

All of your wires for the frequency determining parts are too long.

 

[Tom Biasi]

All of your wires for the frequency determining parts are too long.

And the board makes capacitors. RF on proto boards, a real nightmare.

Tom