Rx888 Mk II and v3.0.27

✔ Now supported, kit available by the end of September 2020.
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sm6fhz
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Rx888 Mk II and v3.0.27

#1

Unread post by sm6fhz »

Hi Simon.

Will v3.0.27 support the 64 MHz instantaneous bandwidth of the Rx888 Mk II?

If so, have you tried it? Any comments?

73 / Ingolf, SM6FHZ

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Simon G4ELI
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Re: Rx888 Mk II and v3.0.27

#2

Unread post by Simon G4ELI »

sm6fhz wrote: Sat Feb 06, 2021 5:24 pm Hi Simon.

Will v3.0.27 support the 64 MHz instantaneous bandwidth of the Rx888 Mk II?

If so, have you tried it? Any comments?

73 / Ingolf, SM6FHZ
No,

Restricted to 32MHz. Do you see a use for 64MHz? The FFT demand would be very high...
Simon Brown :shock:
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sm6fhz
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Re: Rx888 Mk II and v3.0.27

#3

Unread post by sm6fhz »

Hi Simon.
I can see two uses. 6m reception and using Child processes to share different bands (including 6m) with different parts of the station.
Have done some sketches on how filtering would facilitate that.
73 / Ingolf, SM6FHZ

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Simon G4ELI
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Re: Rx888 Mk II and v3.0.27

#4

Unread post by Simon G4ELI »

sm6fhz wrote: Sun Feb 07, 2021 1:30 pm Hi Simon.
I can see two uses. 6m reception and using Child processes to share different bands (including 6m) with different parts of the station.
Have done some sketches on how filtering would facilitate that.
73 / Ingolf, SM6FHZ
As-is it covers 6m I think but am not sure. I can't remember the whole logic at the moment.
Simon Brown :shock:
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sm6fhz
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Re: Rx888 Mk II and v3.0.27

#5

Unread post by sm6fhz »

OK Simon.
6m reception would be a great step. Not too many SDR HW covers just 50 MHz, they seem to have a hole there. The Lime does cover 50 MHz but not with the performance I am looking for.
WRT an instantaneous bandwidth of 64 MHz, have I been running my Lime SDR at 64 MHz BW at e.g. 2100 MHz looking at cellular carriers :-)
73 / Ingolf, SM6FHZ

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sm6fhz
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Re: Rx888 Mk II and v3.0.27

#6

Unread post by sm6fhz »

GM Simon.
If and when you checked (memory refreshed) the logic if SDRC does cover 6m with the RX888 Mk II, please let me know. I am tempted to make a buy if so.
73 / Ingolf, SM6FHZ

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sm6fhz
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Re: Rx888 Mk II and v3.0.27

#7

Unread post by sm6fhz »

BTW Simon.
Here is how my laptop handles the LIME SDR at 61 MHz BW on the 2100 MHz band.
The Screenshot shows the cellular carriers (UMTS) from the local tower.
So I think 64 MHz instantaneous BW from the RX888 Mk II should be perfectly feasible to handle.
73 / Ingolf, SM6FHZ
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fei666888
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Re: Rx888 Mk II and v3.0.27

#8

Unread post by fei666888 »

At present, from the feedback of HDSDR, we can see that HDSDR can't calculate so much data, and FFT can't handle it. It can't run 64M bandwidth on my PC i5 4590, but it can run 64M normally on i7 3770 of ik1xpv. I think if It should be possible to have a computer with sufficient performance. Of course, it is best to be able to continuously optimize and reduce the hardware requirements through software.

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PD3LK
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Re: Rx888 Mk II and v3.0.27

#9

Unread post by PD3LK »

Hi, am i right that one can receive the whole 64 Mhz - with a MK2 - within SDRC but in 2 chunks of 32?
Or is 32Mhz the maximum tunable freq? 73, Leon

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ukdx
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Re: Rx888 Mk II and v3.0.27

#10

Unread post by ukdx »

Leon,

The MK2 can run 70MHz via the ExtIO by editing that to 140MHz sample rate and chosing 70MHz bandwidth and all this on the HF port. I'm hoping to use it to monitor 28, 40, 50, 60 and 70MHz FT8 during the forthcoming Es season.

Sharp limited it to 63MHz viewable for some reason and on my I9 it was using about 18% CPU.

Paul
EwCIaMLXAAAHVDm.jpg

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