Re: [Hamlib-developer] S-meter reading - flrig/IC-7300

[Black M. <mdb...@ya...>]

Thanks...I put that in.

Mike W9MDB








On Wednesday, December 4, 2024 at 02:36:42 PM CST, Philip Rose <gm...@bt...> wrote: 





Hi Mike,

rig.get_DBM returns the value in dB relative to 1mW. S9 is -73 dBm. I've 
patched flrig.c and this now works with the attached patch.

Phil GM3ZZA

On 04/12/2024 19:32, gm3zza via Hamlib-developer wrote:
> Thanks, Mike.
>
> I saw the check-in and planned to git pull and recompile when I get the chance.
>
> Phil GM3ZZA
>
> On 4 December 2024, at 19:05, Black Michael <mdb...@ya...> wrote:
>
>
> Just tested that and I was using rig.get_smeter -- changed it just now to rig_get_DBM and it matches much better now.
>
> If you aren't compiling from the git repo here's a new 64-bit DLL with the fix.
>
> https://www.dropbox.com/scl/fi/q0s2ykjhaz19j7sv84rf6/libhamlib-4.dll?rlkey=m02sjo5hqyfqgquhasdpptals&dl=0
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> Mike W9MDB
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> On Wednesday, December 4, 2024 at 08:47:35 AM CST, Philip Rose via Hamlib-developer <ham...@li...> wrote:
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> I have noticed a discrepancy when displaying the S-meter reading read from IC-7300 using flrig and hamlib.
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> I have looked at the code at each stage.
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> The Icom CI-V has:
>
> Read S-meter level
> *(0000=S0, 0120=S9, 0241=S9+60dB)
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> Flrig converts this into percentage full-scale deflection (S9+60) (IC7300.cxx l. 1670):
>
> mtr = (int)ceil(mtr / 2.41);
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> and the display on flrig and the actual IC-7300, as far as I can tell, look pretty much the same.
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> Hamlib seems to interpret this (flrig.c ll.2388+) as dB above S0.
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>     case RIG_LEVEL_STRENGTH:
>          val->i = atoi(value) - 54;
>          //if (val->i > 0) val->i /= 10;
>          rig_debug(RIG_DEBUG_TRACE, "%s: val.i='%s'(%d)\n", __func__, value, val->i);
>          break;
>
> and converts this to dB above S9 per the comment in rig.h L. 1080.
>
> #define RIG_LEVEL_STRENGTH   CONSTANT_64BIT_FLAG(30)      /*!< \c STRENGTH -- Effective (calibrated) signal strength relative to S9, arg int (dB) */
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> However its not - it's out by about 10%.
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> My app then interprets this per the hamlib definition, which seems to the only specified value and I display a version which is several dB lower then that displayed on the rig or on flrig. I couldn't find in the flrig documentation what rig.get_smeter should return. Looking at rig.get_Sunits and rig.get_DBM it looks like a value of 50 is S9, 100 is S9+60 and linearly interpolated over 0-50 and 50-100.
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> I don't know if this is a general problem across all rigs. Is FSD on the flrig S-meter always S9+60? Or will it vary by rig?
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> It's not a major issue in the grand scheme of things. I was just curious why I seemed to be displaying a lower value than flrig was. It's not an accurate value anyway, just wondered why it was different.
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> 73 Phil GM3ZZA
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