Hi Al,
As Bill has explained, the WSJT-X Rx bandwidth is currently limited to
5000 Hz. But I agree that larger FT8 sub-bands (or multiple sub-bands
on a given HF band) are really what is required to relieve congestion.
-- 73, Joe, K1JT
On 7/9/2021 11:54 AM, Al Pawlowski wrote:
Given FT8’s growth, a built-in way to ask for a jump to an clear frequency, or
channel, certainly seems like a good idea. However, a larger channel is what
really seems to be needed. This could be accomplished (other mode user squawks
not considered) by just setting the WSJTx, and radio, rx bandwidths higher.
With my setup, I can work up to a 4500Hz FT8 channel. If more users were to use
larger BW, it might be a significant congestion relief.
Though my rig can go to 9999Hz rx BW and WSJTx v2.4.0 set to 6000Hz, 4500kHz is
all I can get - above that, decodes stop and the waterfall fills with noise. I
wonder if the limit is due to my CPU speed (usage increases with BW and channel
activity) or a WSJTx thing. Reports from others doing larger BW would be
interesting.
Al Pawlowski, K6AVP
Los Osos, CA USA
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