[Elecraft] Bad crystal filter ?

[James C. Hall, MD]

In response to W4TV Joe's question:

The frequency offset for the 8-pole crystal filter is 0.00 Hz.

The Pitch is 650 Hz on the K3S. And the Mark for RTTY is the standard 2125 Hz.

I've got a new 400 Hz filter on its way so I'll see what the problem is. I just hope it's not an RF board. I took ESD precautions very seriously while building it so, fingers crossed.

73, Jamie
WB4YDL

Sent from my iPad

> On Sep 18, 2015, at 2:30 PM, James C. Hall, MD <heartdoc at nwtcc.com> wrote:
> 
> Working with my newly constructed K3S today, I noticed that receiving through the FL4 crystal filter (400 hz, 8-pole) was noticeably suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be nice and strong with good S-meter indications. Going to 400 Hz the signal would nearly be lost and I could not decode it. Going to FL5 (250 Hz), the S-meter would pick up again with strong signals.
> 
> There's not much to check on the Config menu except the FL4 GN and it's at max (8 db) - not much change. 
> 
> Is there something else I should do to deal with this ?
> 
> 73, Jamie
> WB4YDL 
> 
> Sent from my iPad