If I am correct, then you can most certainly take advantage of your 6
kHz AM filter which will limit your broadcast audio bandwidth to 3.0
kHz.
That only applies in AM transmit because of the double sideband nature
of AM. If you use the 6 KHZ filter for SSB/ESSB/DATA receive, the
entire filter passband is used for one sideband ... one edge of the
filter is placed at 50 Hz in SSB/ESSB or 200 Hz in DATA and the other
edge of the filter is 6+ KHz away from the carrier ... more than enough
for the 4200 Hz HF limit in the DSP.
73,
... Joe, W4TV
On 10/7/2013 7:31 PM, Charlie T, K3ICH wrote:
I believe that figure of 3400 Hz is the AUDIO bandwidth which is
equivalent to an AM bandwidth twice that, or 6.8 kHz. If I am correct,
then you can most certainly take advantage of your 6 kHz AM filter which
will limit your broadcast audio bandwidth to 3.0 kHz. The 15 kHz filter
will get you an extra 400 Hz.of audio, but is probably not practical due
to the excessive bandwidth. Save that one for FM.
73, Charlie k3ICH
On 10/7/2013 4:51 PM, Joe Subich, W4TV wrote:
On 10/7/2013 4:39 PM, Bob wrote:
Just be aware that current DSP firmware in the K3 limits the receive
bandwidth to something around 3400 Hz. So even if you have a wider
filter, like the 6 KHz AM filter, you will not be able to utilize the
full 4 KHz bandwidth of WSJT-X for JT65/MT9 modes.
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