Hi,
I haven't any RFI issue but I noted the spike at the beginning of any
trasmission.
I use an Icom 7610 and on the waterfall I clearly see a kind of spike
that occupies the complete bandwith of audio channel. In my case
100-2800 Hz.
I can see it at any TX start.
I use the USB audio connection between my rig and the PC.
73s,
Maurizio I2NOY
Il 12/04/2019 08:52, Paul Randall ha scritto:
Ed
I can reproduce this on my setup where my antenna is not good for 160m -
causing bad RFI which crashes the USB audio link to the PC. If I start
transmission on 160m with very low power and ease it up I get almost to
full power before the link fails.
I’ve seen no evidence of a spike, actually my observation suggests the
commencement of audio seems to be shaped to avoid one.
My guess is that you have RF feedback problems.
Kind regards
Paul G3NJV
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
Windows 10
------------------------------------------------------------------------
*From:* Ed Stokes <w1...@comcast.net>
*Sent:* Friday, April 12, 2019 7:05:54 AM
*To:* WSJT software development
*Subject:* [wsjt-devel] Does the FT8 signal spike at the beginning of
each transmission?
I’m curious about something I observe about the FT8 signal modulation.
It appears to produce a pronounced spike in the audio at the beginning
of each 15 second transmission.
When I operate on 160, 80 and 40 meters especially this spike will cause
the program to stop producing audio. My computer, a mac mini, is
relatively close to the 160m dipole being used on these bands, about 50
feet.
If I throttle back to -41 dB or so I can make the transmission begin
without stopping the audio, although the spike is still evident.
If I then gradually increase the “Pwr” slider I can increase the power
without causing the audio to crash.
If I leave the power increased the audio will crash immediately after
the next transmission period begins.
Is this a known problem?
73, Ed
W1KOK
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