R10 Version AM Shortwave Broadcast Receiver
Frequency Range 3 - 23 MHz AM
Overview
This is a short wave braodcast AM band receiver with a tuning frequency of 3 - 23 MHz for receiving ordinary short-wave broadcast signals.
The hardware is V8.0 and the main PCB labelled “HM00ABRA_8”.
See Info section below for link to the manufacturers build instructions. I will email my own produced build instructions to you on purchase.
Specifications:
Supply Voltage : 12V (It is recommended to use linear regulated power supply or battery)
Current: 110mA
Tuning Range : 3-23MHz
Mode : AM
Tuning Steps：1KHz/10KHz/100KHz
Very nice search function see video for demonstration.
I have seen some YouTube videos where reviewers have not given this receiver a very good review, often comparing this little receiver to that of one costing £1000 or more sitting on the desk next to it!
However, I found this kit very enjoyable and straightforward to construct and it worked on first power-up.
Does not need a huge antenna - most likely too much signal will overload the circuit - a few feet of wire will do. I tested mine during the day where as you can see from the video - I received a good useable sound from Radio Romania. Conditions and reception would be best at night no doubt!
Full English build instruction containg lots of images of each stage of construction will be e-mailed.
I believe its a usefulk and capable little receiver for the price.
Circuit Description:
Refer to the circuit diagram shown on the last page of this document.
The signal received by the antenna first enters the filter network, and the function of the bandpass filter is to ensure that the 3-23MHz signal can enter the source pole following circuit composed of J310, and other signals are attenuated to the greatest extent.
The signal is then fed into the TA2003 , and there is a mixer inside the TA2003 that mixes the received signal with the PLL local oscillator signal.
The IF frequency is 10.7MHz, and the signal out of TA2003 is sent to 10.7MHz ceramic filter, whose function is to filter out the irrelevant signal generated by mixing, and then it is amplified by 2N2222, after filtering, the signal is sent to TA7613 for further IF amplification, detection, and audio amplify. The TA7613 completes the detection of AM signals and has an internal audio power amplifier that can directly drive speakers.