Hi,
Long ago I used PLL-SSB, with constant power output.
This worked well with DX, but also prevented LFD a lot.
(the drawback was a wider tx spectrum)
I would like to find out if I can use the uSDX for this purpose.
No unit has been bought yet.
With the "old" system a carrier (at zero beat for the rx side) was transmitted in case there was no audio input. So the RF output was always without any amplitude component
At PA setting 8 the uSDX does transmit only phase information (according to a video).
In case of no audio input, is there a carrier transmitted?
I do hope someone can put some info on-line.
73 Henk
PA0C
constant power SSB
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- Posts: 50
- Joined: 30 Dec 2021, 19:29
Re: constant power SSB
Yes, at a drive setting 8, the (tr)usdx is generating a ssb signal with constant amplitude.
When there is no modulation, the carrier is switched off. This is controlled by the noise gate threshold setting. Changing three noise gate setting from 4 to 0 will disable this behavior and never switch off the carrier; in this case there will be background noise transmitted at full power (carrier not switched off).
Guido
When there is no modulation, the carrier is switched off. This is controlled by the noise gate threshold setting. Changing three noise gate setting from 4 to 0 will disable this behavior and never switch off the carrier; in this case there will be background noise transmitted at full power (carrier not switched off).
Guido
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