Re: [Hamlib-developer] IC7300 output power

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

Thanks Sakari.

The only testing I did was on get_level RFPOWER_METER_WATTS on 70 MHz CW/FM. I didn't consider AM and Emergency Mode. I'll need to do some more testing, and looking through the code, but that will probably be tomorrow now.

Phil GM3ZZA.
________________________________
From: Sakari Nylund <sak...@ni...>
Sent: 29 May 2025 7:16 PM
To: ham...@li... <ham...@li...>
Subject: Re: [Hamlib-developer] IC7300 output power


Ok!


Let's see what happens after compiled the latest one.



Power commands were a bit complicated to understand in first place (from man page), but various tests showed up that:


mW2power 'Power mW' 'Frequency' 'Mode'        ---  returns the setting of IC7300 power knob 0.0-1.0  I.E. 0-100%

power2mW 'Power [0.0..1.0]' 'Frequency' 'Mode'  ---  returns the expected power output with power(knob) value %0-100 on used band/mode


That is expected power. I.E. when running for example FT8 with low audio feed to rig you will get less power out than power2mW says.
Value is stable, not depending on PTT state. You get always same result. I.E. just using given power knob % and converting it to mW.


get_level RFPOWER_METER_WATTS   ---  returns the current output power. If PTT is off resut is 0W, if PTT is on result is the measured output power.
While having RF power knob at 100% but driving side band modulation with low audio level the resulting output power is less than power% and RFPOWER_METER_WATTS can really show that when using "normal" Ham bands. Except 70MHz that is added afterwards and with used components can offer just half of rig's nominal max power.
(Compare that to emergency mode! (menu/set/others/emergency/tuner) It would be interesting to test what power values then would be shown!)


Without diving into C, that is not so familiar to me,  I guess the measured  RFPOWER_METER_WATTS conversion does not take on account 'Frequency' 'Mode' combination in all cases I.E. on 70MHz where the max output is only half, just like using emergency mode.


--
Saku
OH1KH

gm3zza--- via Hamlib-developer kirjoitti 29.5.2025 klo 18.47:
PS. I applied that patch to the pull I took this morning.
________________________________
From: Philip Rose via Hamlib-developer <ham...@li...><mailto:ham...@li...>
Sent: 29 May 2025 4:36 PM
To: ham...@li...<mailto:ham...@li...> <ham...@li...><mailto:ham...@li...>
Subject: Re: [Hamlib-developer] IC7300 output power

Hi Nate,


Quickly tested - seems OK.


Phil


On 29/05/2025 16:22, Nate Bargmann wrote:
> * On 2025 29 May 09:39 -0500, gm3zza--- via Hamlib-developer wrote:
>> Right, I can see the issue:
>>
>>
>>    1.
>> The IC-7300 PO meter display %age of maximum power. So 50% max power is displayed as 50%.
>>    2.
>> The CI-V returns PO meter reading.
>>    3.
>> Both Hamlib and Flrig convert this value to Watts using similar look-up tables. Basically they both follow the display on the rig.
>>    4.
>> So for 50% max power gets displayed as 50 W, rather than 25W.
>>
>> Unfortunately I don't have an RF Power meter that covers 70 MHz. My 144/432 meter reads 8W at 50% max power on 70 MHz.
>>
>> Interesting asides:
>>
>> The code for IC-9700 (IIRC in icom.c) divides the calculated power by 10 for the 10 GHz.
>> The IC-705 when operating on battery (max power = 5W) displays 100% max power, but only returns 50% on CI-V, so both Hamlib and Flrig. Obviously the CAT software doesn't know it's running on battery, so it makes sense for the Icom to handle that change.
>>
>> I can implement similar code for IC-7300 on 70 MHz that is there for IC-9700 on 10 GHz.
> Please do.  Sakari can probably test it.
>
> 73, Nate
>
>
>
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