If it's like the original Corsair, there is a 9 MHz 4-pole filter in the
first IF (upgradeable to an 8-pole filter) and a 2.4 kHz filter in the
6.3 MHz second IF. The 6.3 MHz filter gets switched out and replaced by
a 1.8, .5 or .25 kHz filter. The jumper bypasses the 1.8 kHz filter
slot if this filter is not installed.
73,
Bob WB2VUF
On 12/9/2015 3:23 PM, Stuart Rohre wrote:
Most likely the 2.4 kHz filter is what today would be called a roofing
filter, and is in front of the switch, so it is always in the circuit.
Hence, 3 selectivity positions, each more narrow than 2.4 KHz.
Stuart Rohre
K5KVH
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