[Elecraft] JT65HF -- Data Mode A

[Richard Ferch]

John,

What are your filter settings?

The default filter settings in DATA A are Fc = 1500 Hz, width = 500 Hz. 
The JT65 "sub-band" is 2 kHz wide, centered at 1270 Hz, so with the 
default DATA A filter setting you will only be able to copy a small 
fraction of the sub-band and therefore only a small fraction of the 
signals that are on at any time. Your K3's filter width should be set to 
2.5 kHz or so to cover the whole JT65 sub-band.

73,
Rich VE3KI

N9KW wrote:

> I recently downloaded JT656HF by W6CQZ and have on several occasions monitored 14.076 \
> MHZ with my K3/Signalink USB using this software.  I am still in the process of \
> trying to set up the software and gaining an understanding of how to use it.  I \
> experience the following:  1) If I set my K3 in data mode A, no decoding of JT65 \
> signals occurs during the 12 second decoding period, but 2) if I set my K3 in the USB \
> mode, decoding of the JT65 signals does occur in the 12 second decoding period.  I \
> have not tried any transmissions.  I would appreciate any advice/solutions so that I \
> can use data mode A with JT65HF.