The above picture shows the baseband recorded when receiving BPM. You can clearly see the Morse code of BPM.
Convert the 500KHz-30MHz signal to 40MHz-70MHz.
Modified from https://github.com/IgrikXD/Easy-SDR/tree/master/HF%20Upconverter.
Modified content.
Type-B power supply changed to DC5.5x2.1. Switch
changed to toggle switch.
125MHz crystal changed to 40MHz
crystal filter output filter.
No equipment to test performance parameters, just can be used, carefully reproduce.
About welding
, all are 0805, not difficult to weld.
Try to weld R3's 0R resistor according to the schematic diagram.
Choose to weld or not weld according to the crystal manual (the crystal I use is C387110, R3 can be left unwelded)
R6 and R7 do not need to be soldered. The original author soldered 0R to R5. After I soldered a copper wire to it, the SN74LVC1G126DBVR heated up a lot. After changing it to 36R, it became normal.
Regarding component selection
, BOM is for reference only. Do not place an order directly.
The ADE in the middle of the PCB is ADE-1H (ADE-1H and ADE-1H+ should be the same thing, and ADE-1 and ADE-1+ should also be the same). ADE-1 should also be usable, but the parameters of ADE-1H are better.
TB disassembly ADE-1H 12 yuan each, 8 yuan for postage, which seems to be cheaper than ADE-1. Link
. Capacitors with temperature coefficients of C0G/NP0 and 0805 packages are preferred. If you don't have them, look for 0603 ones. If they are not available, you can only use those with temperature coefficients of X7R. Inductors with temperature coefficients
of 0805 (usually blue) are preferred. If you don't have them, look for 0603
SMA connectors and buy them cheaper on tb. Link. If LDO is out of stock, you can also buy it in this store.
About using
5V power supply
. RF-IN connects to the antenna, and RF-OUT connects to SDR.
Since ADE is a passive mixer with attenuation, it is recommended to add an LNA at the RF-IN end.
There should be a peak at 40MHz in the software spectrum when it is used for the first time.
I use SDRSharp, and the frequency offset can be adjusted in the software (check Shift in the Radio window, the value 1 on the right represents 1Hz). Adjust the value to align the peak around 40Mhz with the 40MHz of the software, then subtract 40000000 (40M, 7 zeros) from the value on the right of Shift and fill in Shift to display the frequency normally.
About CC BY-NC-SA 4.0
Although CC BY-NC-SA 4.0 prohibits commercial use, this project allows each person to sell less than or equal to 5 copies, and hopes to clearly indicate that it is open source on the sales page. In other cases, please comply with CC BY-NC-SA 4.0