Field morse trasmitter

[7Coline]

http://imageshack.us/photo/my-images...ansmitter.png/

Antenna wire goes to +/- of a battery.
Ground goes to the other terminal.
When + and - is conected it produces the signal.


Hello everyone,

I went through some training in the army back in the 80's, and I am trying to remember how to transmit a static radio signal. On that picture I drew what I remembered . Is that a valid circuit ? Would it work to transmit ?

Thank you in advance.

[5B4AJB]

It would be very weak, just the click of a spark - if the supply were AC things would be better.

If you had a tuned(able) circuit, you could isolate a frequency to transmit on instead of transmitting a wide signal everywhere, but, for an emergency, what you have might be enough...

[7Coline]

Thank you , and you are correct , this would be use in an emergency situation to send SOS or to guide the rescue party. This method can be used behind enemy lines also . It is used to draw enemy into an ambush . Again thank you for your help .

[K7KBN]

It would be hard to predict which would die first, the battery or the key contacts.

[G4LNA]

As Pat says it will kill the battery in short order. If you just want to send clicks then put a big fat inductor in series with the key, the collapsing field will create a spark at the key contacts. It will kill the key contacts after a while, but in an emergency, who cares?

[5B4AJB]

Rig up a windmill to do the keying if you're beating the bushes...

[druid]

When I was a kid, I built an almost-working, highly-illegal AM transmitter from a 6V battery, a buzzer, a car ignition coil and a carbon mike. Without the mike it would work great as an all-band CW transmitter...

Lloyd
VA7LAS