I found a nice serial interface module with a PE4302 on eBay. Looks very nice with good shielding when connected to the tinySA



It only requires the shared SPI clock and data lines and a dedicated? chip select line? (LE) so the number of IO lines for the Arduino is reduced with 5.
Although the PE4302 formally not does not have SPI interface the clock timing in the tinySA.ino (see updated version in file area) fits the timing requirements.
But there is something you should pay attention to when using a module like this.
Opening the shielded box quickly reveals what the issue might be



There is a dip switch inside that allows setting of the 6 parallel inputs and the PUP (power up state) lines.
Nice if you need a certain fixed attenuation. But the real problem is in J7,J5, J4 and J6
By applying some solder on J7 and J4 and keeping J5 and J6 open (as can be seen in the picture)? you put the module in serial mode.
But my module was delivered in parallel mode (J5 and J6 closed and J7, J4 open).
This is connecting the chip select (labeled LE) hard to 3.3V thus making it easy to destroy your Arduino.
So be warned when using such a module!!

The updated tinySA.ino in the files area contains the code for both the parallel and serial version of the PE4302.
Formally the module should by supplied with 5V through the blue screw connector but applying 3.3V through then pin header works as well
A small warning about the code. There are some remainders of experiments with a SI4463 are RX module. These are disabled
On paper the SI4463 could deliver superior performance but in reality the phase noise and RBW of the SI4463 was far worse versus the SI4432
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK

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