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Now that things have settled down a bit and my transmitter and receiver are stable I took some time to measure the frequency response from the input to the transmitter to the output of the receiver. The midband level was adjusted so the transmitter (SSTRAN) compression was not active and the receiver bandwidth was set to 16 kHz.
The results are:
3 dB bandwidth: 50 to 11150 Hz.
Passband gain: Flat within +/- 1 dB.
No wonder the audio sounds so good! These numbers reflect the performance of both the receiver and transmitter and together they give very good results.
If time permits I will try to separate the response so the transmitter performance and the receiver performance can be seen individually.
P.S. Enjoyed the stories about other old radios. Keep them coming.