On 2/6/23 10:14 AM, Larry McElhiney via groups.io wrote:
The boards use three terminal ceramic filters for Bandpass. (Really only two terminal, but can be installed without regard to “polarity”.
They are actually ceramic resonators and sell for about 10-15 cents apiece from China.
Since the evaluation boards have been sold for as low as $8.00, the manufacturers will use low cost components.
Anyone have a part number? Usually, the data sheet will show S21 and S11.
