|Jack at the Controls|
We first connected each module as a standalone device to ensure each worked as expected. We were both most interested in the Crystal Filter performance measurements. My previous measurement attempts with the AIM-4170B were inconclusive, other than the shape of the bandpass.
With Jack's Lab Equipment we measured the bandpass and insertion loss of the Crystal Filter. The bandpass is 6KHz, and insertion loss is about 3db, with about 2db of ripple. With some tweaking, I think the ripple could be reduced.
We later checked the operation of the standalone RF Mixer, and then the IF Amplifier. The RF Mixer worked similar to one of Jack's known mixer. The amp provided about 30db of gain at 20MHz.
We connected all three modules together and I very pleased with the results.
|Output of the IF Amp|
Horizontal = 20MHz Center, 5KHz / Div
Vertical = -30dbm at top line, -110db at bottom, 10db / Div
LO was 200mV RMS
The RF Signal was Detectable down to -90dbm
More of my "Minima" module implementations will follow.
Thanks Jack, for the measurement help.
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