[hpsdr] Getting PowerSDR to display SWR

[John Westmoreland]

Phil & HPSDR,

OK - took a look at the code and have some test code implemented - issue is
using real #'s in the Verilog environment for the FPGA; specifically - two
functions, square root and absolute value are needed to compute SWR
correctly from the current hardware configuration.  Another possibility is
if Voltage or Current can be extracted - then that would make the
calculation simpler.
>From some rough testing I did sending an SWR test value over vs. the
Reflected Power - looks like it was working.  To be sure I will want to
review the code for PowerSDR though.

73's,
John
AJ6BC

On Wed, Mar 7, 2012 at 6:07 PM, John Westmoreland <
john at westmorelandengineering.com> wrote:

> Hello Phil,
>
> If this can be implemented in PennyLane then that is great.
>
> I will take a look at the source and see what it will take.
>
> 73's,
> John
> AJ6BC
>
>
> On Wed, Mar 7, 2012 at 4:39 PM, Phil Harman <phil at pharman.org> wrote:
>
>>   Hi John,
>>
>> Your correct, we did look at this before.  From memory the issues is that
>> there is a delay between the FWD and REV samples that means for  other than
>> a steady carrier the SWR reading is meaningless.  I think this was a
>> problem with the Flex hardware but not sure if we will have the same
>> problem.
>>
>> The solution may be to calculate the SWR in the FPGA on Penny(Lane) since
>> that will have the least sample delays.
>>
>> 73 Phil...VK6APH
>>
>>
>>
>>  *From:* John Westmoreland <john at westmorelandengineering.com>
>> *Sent:* Thursday, March 08, 2012 3:37 AM
>> *To:* HPSDR list <hpsdr at lists.openhpsdr.org>
>> *Subject:* [hpsdr] Getting PowerSDR to display SWR
>>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>  ------------------------------
>> HPSDR,
>>
>> I am sure this has been discussed before - but I can't seem to find it in
>> the archives.
>>
>> Is there a way to get PowerSDR to display SWR on the TX Meter?  In the
>> configuration settings there is a box to pick for this - but when you run
>> there is not a way to select SWR.
>> Reflected Power is there - but not SWR.
>>
>> Thanks in Advance.
>>
>> 73's,
>> John
>> AJ6BC
>>
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