Transmission outside transmission bandwidth into the other sideband
Posted: Thu Jun 08, 2023 4:53 pm
Has anybody seen this or know what the issue could be?
My radio 7000DLE MKII is transmitting outside the SSB transmission bandwidth ABOVE the selected frequency.
You will see on the pics that the selected freq is 3.940 LSB and I am transmitting out to 3.942 into the USB spectrum.
It shows up on my display and it shows up on the receiving transceiver on another radio far away, so it isn't an artifact of he display, it is amplified by the amplifier even when using pure signal.
This happens all bands. Even with 0 watts power output.
It happens LSB and USB. All transmit profiles. Noise gate on or off.
Is this a software issue / setting or is this a hardware issue?
Is this normal?
My son's 100D does not do this.
Any help is appreciated.
While talking. 50 hz low cutoff transmit profile. Notice how the signal above 3.940 in the USB looks to be an exact mirror image of the first 200 hz below the transmit freq in the LSB
The white area is the transmit filter
While not talking with downward expander being used as a noise gate. Notice how the spike on either side of the transmit freq is exactly the same offset from the transmit freq.
This is the transmit filter low cutoff at 300 hz and you can see it is still signal 300 hz outside the filter cutoff
My radio 7000DLE MKII is transmitting outside the SSB transmission bandwidth ABOVE the selected frequency.
You will see on the pics that the selected freq is 3.940 LSB and I am transmitting out to 3.942 into the USB spectrum.
It shows up on my display and it shows up on the receiving transceiver on another radio far away, so it isn't an artifact of he display, it is amplified by the amplifier even when using pure signal.
This happens all bands. Even with 0 watts power output.
It happens LSB and USB. All transmit profiles. Noise gate on or off.
Is this a software issue / setting or is this a hardware issue?
Is this normal?
My son's 100D does not do this.
Any help is appreciated.
While talking. 50 hz low cutoff transmit profile. Notice how the signal above 3.940 in the USB looks to be an exact mirror image of the first 200 hz below the transmit freq in the LSB
The white area is the transmit filter
While not talking with downward expander being used as a noise gate. Notice how the spike on either side of the transmit freq is exactly the same offset from the transmit freq.
This is the transmit filter low cutoff at 300 hz and you can see it is still signal 300 hz outside the filter cutoff