Why does this CW Transmitter have an diode and not an choke?

[Scarlett133]

I found this modified Cw transmitter, normally it has an Choke to block HF towards the power source but why an diode?

 

[dick_freebird]

People try all kinds of things. Not every idea is a good one, but that doesn't stop folks from putting it out there.

Maybe using Google picture search would get you to where any design explanation and results measurements sit, that relate?

 

[KlausST]

Hi,

this also is a reason why I recommend NOT to use random schematics form the internet.

Better use schematics form reliable sources, like: semiconductor manufacturers, universities, reputable electronics designers ... then they usually come with a complete description.

Klaus

 

[Scarlett133]

People try all kinds of things. Not every idea is a good one, but that doesn't stop folks from putting it out there.

Maybe using Google picture search would get you to where any design explanation and results measurements sit, that relate?

I didnt find anything regarding how and why an diode was used, it seems like the creator was trying to do the same without an choke, block hf ac so it doesnt short the HF to ground

 

[FvM]

My first guess is that power schottky diode 1N5818 has about no effect on circuit operation at 7.2 MHz. The diode is staying forward biased, any possible RF voltage across the diode is blocked by high junction capacitance (several 100 pF).

 

[Scarlett133]

My first guess is that power schottky diode 1N5818 has about no effect on circuit operation at 7.2 MHz. The diode is staying forward biased, any possible RF voltage across the diode is blocked by high junction capacitance (several 100 pF).

Danke, Makes Sense