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Topic: FreeDV frequency RX/TX (Read 1738 times)
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SP3OSJ
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FreeDV frequency RX/TX
« on: 22. September 2018, 16:42:09 »
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Hi
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| « Last Edit: 29. June 2022, 21:06:00 by SP3OSJ » |
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DB4PLE
positron
Urgestein
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Posts: 1278
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Re:FreeDV frequency RX/TX
« Reply #1 on: 22. September 2018, 18:00:12 »
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Hi Artur,
Frequency does not change DURING transmission, it transmits obviously on the wrong frequency when using FreeDV.
Nevertheless, this should not happen. Which firmware version have you been using? And the displayed frequency is strange, do you have configured transverter settings? If so, please try without transverter settings active. If not, then where do these settings come from?
73
Danilo
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DB4PLE
positron
Urgestein
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Posts: 1278
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Re:FreeDV frequency RX/TX
« Reply #4 on: 23. September 2018, 13:46:46 »
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Hi Artur,
well, since it works for us, without full information about your setup and the steps how to reproduce the issue on a stock (!) OVI40 or mcHF you are out of luck most likely. Please provide complete information about your setup (hardware and software) and we may be able to help. At least I won't touch this issue at all before more information is provided.
73
Danilo
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DB4PLE
positron
Urgestein
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Posts: 1278
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Re:FreeDV frequency RX/TX
« Reply #5 on: 23. September 2018, 19:25:50 »
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Hi Artur,
you still did not tell us which firmware you are using and hardware you are using.
I already checked, and the transverter settings just change the displayed frequency value, these are not used in the actual tuning of the oscillator. So there is no influence here.
However, FreeDV does ZeroIF transmits (i.e. it does not do a frequency shift of -6 khz during TX as it does during RX. Which means, it changes the tuning of the Si570 by 6khz compared to the RX Si570 frequency in order to transmit at the same spot it receives.
So if you use your own hardware (which you are obviously using, which is not a problem for me; however, what is a problem for me is that you do this without telling us rightaway and, frankly said, wasting our time by this) does some kind of multiplication of the Si570 output frequency, well, that's it. Your transmission will be offset by (Multiplier-1)x xlate_frequency. You can do the math on your own.
73
Danilo
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| « Last Edit: 23. September 2018, 19:26:36 by DB4PLE » |
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