Radio Short Wave DIY Version II

I am a shortwave listener and use to build-up my receivers.

This is my homemade short wave radio receiver I built-up some time ago. It is a super heterodyne circuit based on ICs AN7223, TEA5570, TDA2822M, w/ J-FET pre-selector in the antenna input.

Here I was receiving the 49 meter BCBs stations @ 10:00am (the propagation was not so good at that time).

The frequency of local oscillator (generated by the TEA5570) is read by a frequency counter (also homemade). Note that the read frequency is 455kHz above the real BCB frequency.

The coarse tuning is done by the large variable capacitor and the fine tuning is done by a 100k potentiometer, thanks to a trick, I developed a circuit configuration on the TEA5570 that works as a VCO, without the need to use varactors (tuning diodes).

The IC AN7223 does the mixing, IF amp and demodulation jobs.

This receiver covers a continuous band from 0.1MHz to 28MHz, I just needed to exchange the coils.

Additionally information: this video was recorded in HD 720p, on Sony DSC-H20 camera.

Category:

Science & Technology

Tags:

• Superheterodyne
• superheterodino
• ondas-curtas
• shortwave
• DX Listener
• DIY
• electronic homemade
• Ham
• amateur radio
• radioamador
• 49 metros 49 meter
• DX radio
• radio-escuta
• DSC-H20
• SONY H20

[UKHamRadio]

Whats the frequency range??? Impresive counter :)

[Cesarsound1]

@UKHamRadio

Range: 100kHz - 28000kHz (need to exchange the inductors).

The counter is homemade using the single chip ICM7216B -

intersil dot com

Thanks for watching.

[EvilPyroCan]

@Cesarsound1 I just busted the ICM7216B chip I had when I was building my own counter. :( I believe I accidentally put a too high input voltage so now it won't count anymore. But now I'm designing my own freq. counter out of logic gates! :D

[Cesarsound1]

@EvilPyroCan

Bad news, but it happens. I hope you get your new counter working fine.

Cheers.

[VoxPandemonium]

Impressive!

Thanks for sharing.

[Cesarsound1]

@VoxPandemonium

Thaks for watching!

[Cesarsound1]

@timaaarrreee

Hi, thanks for your comment. The high frequency whistle can be improved using a more narrow filter on front end and on FI stage and/or using a double conversion circuit, but the circuit will become much more complex.

[Cesarsound1]

@poikaa3

Hi, thanks for watching and the comments. I agree with you and I am big fan of analog tuning for SW. The blue led is more an ornament but it also indicates the proper operation of regulator output on power supply board.

[poikaa3]

Nice build! Analog tuning seems to be a great way to tune in a short wave station, your ears are the best judge! What is the purpose of the blue LED?

[Cesarsound1]

@pesnyaozemle

Thanks.

Yeah, The Animals rules:)