The Corsair II came stock with a 9MHz 2.4KHz 8-pole filter soldered in.
Barry N1EU
On Tue, Dec 15, 2015 at 3:26 AM, Bwana Bob <wb2vuf@verizon.net> wrote:
> 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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>>
>>
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