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| Hantek DSO2D15 FM modulation issue |
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| iw2evk:
Hi all, The internal Signal generator on May Dso2D15 scope work fine in AM modulation but have a FM modulation issue. When i choose a deviation less the 30 kHz the Signal it's not modulated. Over +/- 30 khz work fine This is a problemi during test of FM VHF UHF transceivers where the FM modulation it's max +/- 5khz. Someone know a solution ? i've contacted via mail hantek with no reply. Thanks Roberto |
| Aldo22:
Why do you think the signal is not modulated? I can't reproduce that here. |
| iw2evk:
Hi, with a 50cm wire place as antenna in bnc and a transceiver near i can't hear the fm +/- 5khz modulated signal from 1 khz tone. If i setting +/- 75 khz deviation and hear with a standard home fm receiver i've a cristal clear note on speacker. So i suppose a issue in low level modulation. if you have a HF transceiver make yourself this test.. Note : for 88-108 Mhz setting are Fout 10,7 Mhz (i.f.) deviation +/- 75 khz tone modulation 1khz (heard Ok) for transceiver Fout 24 Mhz deviation +/- 5khz tone modulation 1khz (no audio in transceiver) |
| Aldo22:
Are you sure this has to do with the Hantek AWG? I don't have an RF transceiver and don't know much about it. I can only measure with the TinySA that the modulation is there. |
| iw2evk:
Yes, the minimum modulation in Fm it's +/- 5,6 khz . Under this limits the modulation it' s NOT applied to carrier (no tone received in radio). Over the tone appears .. Try to generate a Fm signal at 10,7 mhz and receive with a fm 88-108 mhz radio place in contact tp the central of bnc output with a shorth piece of wire. Then decrease the % of modulation and listen.. |
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