Preamplifiers for Remote Control Reception

How much variation is there in the reception sensitivity of the uPC2800A ?
The center frequency when using the PH302 photodetector from NEC Electronics is 70kHz.
An 800Ω resistor and 0.01uF capacitor are inserted in series at pin 7.

The distance variation will be between about 0.65 times to 1.45 times the center value.
The following characteristics affect the sensitivity.

(1) Variation of input resistance

The current of the current signal generated by the PIN photodiode and converted into a voltage signal differs depending on the variation of the input resistance.
The sensitivity will vary from about -3dB to +2.5dB in accordance with the resistance variation.

(2) Voltage gain variation

There is a variation of about ±4dB in the voltage gain.

(3) Variation of detector

How do I adjust the reception sensitivity?

The reception sensitivity can be adjusted by externally attaching a resistor to pin 7.

The description of pin 7 under 1. PIN FUNCTION in the data sheet includes the comment, "The gain of the amplifier can be adjusted by an external resistor (0 to 1kΩ)".
However, if a 10kΩ resistor is used, do any other problems occur except reduction of the reception distance?

No, apart from a drop in the sensitivity, no other problems occur.
We have reference data showing a voltage gain of about 69dB when a 10kΩ resistor is used (C = 0.01uF), but this value is not guaranteed.