Zinc 80 Meter CW Transmitter, Actual Sound Heard From Various Distances.

More info is available at http://www.sparkbangbuzz.com

This is an update to the previous video "Zinc Negative Resistance 80 Meter CW Transmitter". In the previous video, the sound of the transmitter at 5 miles was simulated. This update plays the actual sound of the transmitter as recorded on video from various distances up to 5 miles.

K7NS builds a very simple 80 meter cw qrp transmitter made out of a homemade zinc negative resistance diode. This simple radio transmitter is made without using any vacuum tubes or transistors, and it's ultra low power of 100 microwatts can be easily heard 5 miles away.

Thanks to W9RAN for his contribution of using a quarts crystal in place of an LC circuit.

Category:

Science & Technology

Tags:

• zinc
• negative
• resistance
• oscillator
• tunnel
• diode
• qrp
• ham
• radio
• transmitter
• nyle
• steiner
• k7ns

[kae4466]

Dang . 2 miles and still solid copy.

[sagaertj]

Nice done

Makes me think of the same negative resistance used in gunn diodes for microwave radars placed in a resonant cavity.. 73's ON5DI

[penseur817]

absolutely genius

[penseur817]

@dpsdoeo it's direct . we're extremely low power. the waves in this config can't be " skywaves".

[dpsdoeo]

Is this direct wave propagation or ionospheric?

[bityard]

I approve of this hackery

[ivicabulog]

Actualy it doesn't amplify but it (ZnO) has negative resistance so it is possible to make an oscilator. See electronic books for oscilators. Of course we can talk also about aplfication in some cases.

[mailomail]

Congratulations!!! Nice device indeed but... I don`t understand how it works:)

The zinc negative resistance device looks like a simple diode. It has only two electrodes. Only transistors or triodes are able to amplify signals, because they have three electrodes. So how does the device with only two electrodes amplify the signal? Would such a transmitter work also with germanium diode or galena diode?

[crazyscientist]

hey Tim, KC9POS I built your transmitter

my first one I built since I got my Radio license which was april. And enjoy is very simple and was heard 1 mile away from a friend with an 80m invert V thank you.

[sv6czq]

Awesome! Congratulations for your simple constructions and thorough video! BRAVO.