Search found 5 matches

by mike_ve3ebr
Sun Apr 15, 2018 12:15 pm
Forum: Diversity Operations
Topic: Phase Relationship between VFO A and VFO B
Replies: 9
Views: 2608

Re: Phase Relationship between VFO A and VFO B

Hi Walter: Actually, that's exactly what I thought of, immediately after posting my previous response! BTW I downloaded and checked out the verilog FPGA code for the Orion MkII and I think I see where the problem is. As surmised, the 'diversity' command seems to just change the phase accumulator inc...
by mike_ve3ebr
Fri Apr 13, 2018 10:59 pm
Forum: Diversity Operations
Topic: Phase Relationship between VFO A and VFO B
Replies: 9
Views: 2608

Re: Phase Relationship between VFO A and VFO B

Hi Scott: That might explain why I experience the problem but Rob does not. I would have to assume that the FPGA code in the 7000DLE is different from that in the 200D. AFAIK the FPGA devices themselves are different for starters. From what I read of numerical oscillators, they usually have a phase ...
by mike_ve3ebr
Fri Apr 13, 2018 9:08 pm
Forum: Diversity Operations
Topic: Phase Relationship between VFO A and VFO B
Replies: 9
Views: 2608

Re: Phase Relationship between VFO A and VFO B

wu2o Yes, I noticed that in Diversity mode that the VFO-B window is greyed out and you can't change it - nor would you want to of course. Both receivers have to be set to the same frequency. I checked the schematic for the Anan7000DLE and both ADC's are driven synchronously and directly from the 122...
by mike_ve3ebr
Fri Apr 13, 2018 6:39 pm
Forum: Diversity Operations
Topic: Phase Relationship between VFO A and VFO B
Replies: 9
Views: 2608

Re: Phase Relationship between VFO A and VFO B

Hi Rob: Thanks for the response. I'm using the same version of openhpsdr you are i.e. 3.4.9 and I tried it a couple of times. Maybe I'm setting something up differently from you or maybe the 7000DLE behaves differently from the 200D. I'll scrutinise your video carefully and see if I'm doing anything...
by mike_ve3ebr
Fri Apr 13, 2018 2:20 pm
Forum: Diversity Operations
Topic: Phase Relationship between VFO A and VFO B
Replies: 9
Views: 2608

Phase Relationship between VFO A and VFO B

I had some frustrating attempts to set up an interference cancellation system employing coherent cancellation with 2 antennas feeding RX1 and RX2 of my Anan 7000DLE and using the Diversity control of openhpsdr. So I tested the setup in a 'clean' condition. I set up a signal generator at 14.2MHz at a...

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