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Arduino-Wanmod.php    9648 Bytes    26-12-2022 16:21:12

Arduino/Genuino Project "Wanmod"

A Frequency Selective Levelmeter, 99 kHz ... 29.999 MHz

Arduino Project 'Wanmod'

View from the Front

Frequency Range0.099 ... 29.999 MHz
Level Range-99.9 ... -9.9 dBm, 7 dBµV ... 97 dBµV
Power Supply12 ... 15 V, 499 mA
Remote Controlyes
Measurement Bandwidthsee below. Approx. 5 kHz

✈ The building Blocks • Functional Description

Arduino Project Wanmod (Block Diagram)

The mastermind of this design is of course the Arduino Nano Every. It displays the status on the 128 x 64 px oled display. The Arduino Nano also handles the Serial Communication (Can be USB or Envico).

The Design uses the "classical" double-super concept. A very high first IF is based on a SAW Dect Filter, running at 110.592 MHz with a Bandwidth of 1.728 MHz. (Epcos, B8104). A Mixer (NE/SA 612) powered by a 100 MHz XCO takes over and feeds a 10.7 MHz crystal filter, made out of 4 crystals. Hand-selected, of course.

The RSSI is is measured by an AD8307 in collaboration with an AD603. This circuit follows the recommendations in the datasheet. Instead of using the 10 mV/dB tap, replica builder should connect the output (Pin 4 of the AD8307) directly to the ADC. This will improve the resolution by approx. 1 Bit.

Arduino Project Wanmod (View inside)

View inside. Classical superheterodyne approach.

PLEASE NOTE : You must use the programmeable version of the Si564. Partnumber we used is 564AAAA00012ABG - others may work as well. And second, SiLabs sold those oscillators to Skyworks.

✈ The Crystal Filter, 2 nd IF, 10.7 MHz

As seen from Bottom side - Hi-Q Capacitors only
and from above ... a Beauty 555

The crystal filter is split into two blocks of four crystals. It is our standard design, found elsewhere on this website. The two blocks are separated (isolated) by a buffer amplifier (BUF 602, High-Speed, Closed-Loop Buffer from TI).

The 10.7 MHz Intermediate Frequency is also made available at the rearpanel (BNC) for demodulation e.a.

We used SQCB low ESR Capacitors from AVX RF (Sample Kit). Using 'any' capacitor may ruin your day (and the filter frequency response).

Using the Ningmod with this script, we swept at a Center of F = 9 MHz, Span = 40 kHz, with a Power of P = -20 dBm and N = 100 Points to measure the IF Filter Response. It looked liked this :

Arduino Project Wanmod (IF Filter Response)

✈ Downloads

✈ Remote Control of the Wanmod

Remote Control with e.g. HTerm 0.8.5 from Tobias Hammer

✈ Optimizations

Arduino Project Wanmod (Block Diagram)

Antistatic Foam greatly reduces crosstalk from the Arduino ...

✈ Share your thoughts

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t1 = 6585 d

t2 = 188 ms

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