Re: Water Fall display distribution of users #Waterfall #question


Joe Subich, W4TV
 

On 2021-10-06 8:47 PM, Jim Brown wrote:
Audio distortion products that fall outside the sideband TX filter do
NOT burn TX power.
That *assumes* the transceiver still has a crystal filter in the
transmit path. Many of the newer SDR based designs lack crystal
(or other 2.7 KHz bandwidth) filtering in the transmit path and
rely simply on "audio shaping" in the microphone amplifiers.

Over driving the audio input not only creates distortion in those
circuits, it renders the simple passive audio filtering useless.

73,

... Joe, W4TV


On 2021-10-06 8:47 PM, Jim Brown wrote:
On 10/6/2021 3:00 PM, Michael Black via groups.io wrote:
Better to not generate any as that is some of your power being wasted.
Audio distortion products that fall outside the sideband TX filter do NOT burn TX power. But the war on distortion products is certainly a worthy one. Learning how to properly set audio levels is also quite worthwhile, but may be too much to expect from most hams. There's a tutorial on my website that offers four methods, depending on resources. See page 3 of this link.
http://k9yc.com/USB_Interfaces.pdf
73, Jim K9YC

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