[TenTec] MFJ Filter to work on TT540

[Dr. Gerald N. Johnson]

Its good only for CW, won't pass SSB.

The MFJ input impedance is much lower, can't be sure about the output 
impedance but that's probably not nearly the problem that loading a 
circuit expecting 220k with 3.3K will make on killing the audio. If the 
input was modified with an op amp, source, or emitter follower to raise 
the input Z it should work.

73, Jerry, K0CQ

On 9/3/2010 1:25 PM, Marty Hartwell wrote:
> Hi
>        Anyone think this filter from MFJ will work in the TT540 Triton IV as
> a CW/SSB filter? Looks like a two pole but not sure if it will work in place
> of the 245 filter made for the 540 and no longer available.
>
>
> http://www.mfjenterprises.com/support.php?productid=MFJ-726
>