Just rechecked, The first Xtal filter 6KHZ WIDE. tHE IST IF IS 2 POLE IN THE TR-7. 4 POLE IN THE R-7a but it is 4 pole and not DOES NT HAVE STEEP SKIRTS. The TR-7 uses 2 MONLITHICS AND TIGHT L/C AND HIGH Q (sounds like the K2)I. That is why you can use a 10K resistor instead of the 8KHZ. in the second IF.in a TR-7/R7A. That is my best rig. Just got a dds VFO for it. Many rigs are a mix of 1 stage IF DSP, The second is audio DSP. I know about roofing filters..
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