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

[gm3zza <gm...@bt...>]

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

Mike W9MDB







On Wednesday, December 4, 2024 at 08:47:35 AM CST, Philip Rose via Hamlib-developer <ham...@li...> wrote: 







I have noticed a discrepancy when displaying the S-meter reading read from IC-7300 using flrig and hamlib.




I have looked at the code at each stage.

The Icom CI-V has:

Read S-meter level
*(0000=S0, 0120=S9, 0241=S9+60dB)

Flrig converts this into percentage full-scale deflection (S9+60) (IC7300.cxx l. 1670):

mtr = (int)ceil(mtr / 2.41);




and the display on flrig and the actual IC-7300, as far as I can tell, look pretty much the same.

Hamlib seems to interpret this (flrig.c ll.2388+) as dB above S0.




   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) */




However its not - it's out by about 10%. 


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.





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?




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.




73 Phil GM3ZZA















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