Constant Amplitude in SSB, PE1NNZ firmware, embedded in uSDX & (tr)uSDX
Автор: Pascal Nguyen
Загружено: 2022-02-27
Просмотров: 651
Описание:
A two tone generator is connected to my uSDX mic input via a transformer 8 Ω / 600 Ω and a PTT latched switch for Tx.
A 50 Ω dummy load and DSO probe are connected to RF output uSDX BNC connector and coupled via stray capacitance to a ground terminated FT-817 tuned to 51MHz as a receiver.
This setting allows to listen to Two Tone transmission without using any attenuator.
The DSO probe is set to 1:10 ratio to measure Vp-p at the 50 Ω terminal and waveforms of amplitude modulation.
The amplitude modulation can be adjusted either by Two Tone Generator volume control or menu setting (ie drive = 8 for constant amplitude)
00:00 PS preset @ 13.8V / 1.5A limiter
00:10 Freq preset @ 51.000MHz
00:21 Tone preset @ 1200 & 1400Hz dual tone Android app
00:32 toggle PTT switch, uSDX transmit to dummy load
00:40 FT-817 S5 with FT-817 Ant Input 50Ω terminated
00:59 DSO 56.8 Vp-p = 8W with Constant Amplitude
01:07 DSO 53.6 Vp-p = 7.2W with best eyes linearity
01:17 FT-817 + - 1KHz tuning (50.009 - 51.001 MHz)
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