[Elecraft] OP1 and CW filter gain difference?

[Stewart Baker]

Marteinn,

The CW filter has a greater signal loss than the OP1 filter mainly because of
it's varicap variable bandwidth design. My K2 has about a 6dB loss relative to 
the OP1. Your CW filter loss of 10dB may be a bit high. I would check the 
varicap lead orientation.

73
Stewart G3RXQ

On Fri, 8 Apr 2005 15:49:53 +0000, Marteinn Sverrisson wrote:
> Hi All
>
> I was measuring the gain difference of the OP1 x-tal filter and the
> CW filter on my K2.
>
> It seems that the OP1 filter has +10dB more gain than the CW filter
> I have the 2.5kHz OP1 filter mod and the stock CW filter on 2.4kHz.
> Measurements are done on 7 MHz band on LSB.
>
> I did the measurements with AGC off, using noise gen and audio
> spectrum analyzer.
>
> Is this normal?
>
> Should I look for some bad X-tals or varicaps in the CW filter?
>
> 73 de TF3MA
>
> PS. same results if I unmodule the KSB2, the gain is still low.