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.

[Cesarsound]

Thank you!
I need to group, organize and digitalize the schematics of all stages of circuitry, because I have it write down in drafts (paper) and some parts are on my mind.
Sure, I will publish and share the as built schematic of this radio as soon as I have finished this work.

[Cesarsound]

Hello Greg, my friend, You are a kind person.
Thanks for watching the video.

[pesnyaozemle]

Great!! The animals' really fits your radio.

[TheGreatBunghole]

This is a VERY nice looking radio! Great job!

Is this based off of any schematics, or is it your own personal design?
The reason I ask is because I was a pretty avid SWL, until my radio broke, and I have even resulted to experimenting with receiving SW on my AM/FM receiver... it works ok, but I think I would much rather build my own radio. Are there any designs you recommend? :)

[greentree]

Very impressive. You have use 2 ic here but in last project you used tea5570 only. Have you got the schematic please.

[maplewoodsp]

Most excellent. Could you publish details so that others can duplicate this receiver?

[Cesarsound]

@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.

[Cesarsound]

@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.

[Cesarsound]

It is possible. First you need the schematic of radio an locate the local oscillator. Then you may pick up the signal of local oscillator coupled via 1pF capacitor to a RCA or BNC connector. Eventually, you will need to install a transistor buffer inside the radio, to amplify this RF signal.

[Cesarsound]

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

[Ragnwalden]

@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

[Cesarsound]

@TheGreatBunghole16
Hi, thanks for watching!
This is based on ICs AN7223, TEA5570, TDA2822M, w/ J-FET pre-selector in the antenna input, bud with lots of improvements made by myself (several hours of research and testings).

I recommend you to download the datasheet of TDA1072 IC by Pilips, there is a complete schematic there. It is a good circuit for SW radio.

[Radiotreehut]

Hello Sir, tea5570 have mixer, if amp and demodulator also. Why u had to use another ic than

[poikaa]

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?

[greentree]

Love to watch your vedios...How you made tea5570 tune without varactor diode. Also any idea of controlling the internal if gain of this ic?.

[Cesarsound]

@VoxPandemonium
Thaks for watching!

[Penetrovisk]

ficou jóia.. mas este trafo ai dentro sem isolação não acrescenta ruido?? experimente varicaps no lugar dos variaveis, fica bem menor e sofrem menos interferencia.

[Cesarsound]

@pesnyaozemle
Thanks.
Yeah, The Animals rules:)

[Cesarsound]

@UKHamRadio
Range: 100kHz - 28000kHz (need to exchange the inductors).
The counter is homemade using the single chip ICM7216B -
intersil dot com
Thanks for watching.