Questions and discussions about the software that runs on the TD RF module itself.
francois
 
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Joined: Tue Jun 16, 2015 6:13 am

Tx power management

by francois Sat Aug 01, 2015 6:06 am

Hello
I have some link budget issue on UL
What is the TD1208 nominal Tx power value (10 dBm?).
How can I can i access and manage the PA to boost the power transmission?
Thanks
Francois
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lcheminade
 
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Joined: Mon May 11, 2015 7:47 am

Re: Tx power management

by lcheminade Mon Aug 03, 2015 8:19 am

Hi,

On a TD1208 Tx current at 10dBm is 37mA. Default and recommended value is 14dBm which draws 50mA.

Use the TD_SIGFOX_RfPower function to configure it (param in dBm range 0 to 14).

Please note that for user having a TD1205 the range is 0-20 with 20dBm drawing 100mA.

Regards.
francois
 
Posts: 47
Joined: Tue Jun 16, 2015 6:13 am

Re: Tx power management

by francois Tue Sep 08, 2015 8:36 am

Thanks!
Is 10dBm the default value?
Francois
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lcheminade
 
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Re: Tx power management

by lcheminade Tue Sep 08, 2015 8:43 am

No default is 14dB.
zeliuq
 
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Joined: Mon Jul 06, 2015 7:57 am

Re: Tx power management

by zeliuq Thu Sep 10, 2015 2:33 pm

I guess that those 14dBm limit for the max. tx power are with the purpose to maintain compliance with the regulatory requirements of the ETSI standard.
Does it mean that the TD1205 at 20dBm is not compliance with the standard?
Thank you in advance for your help.
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lcheminade
 
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Re: Tx power management

by lcheminade Thu Sep 10, 2015 2:36 pm

TD1205 is losing 6dB in the antenna resulting in a 14dB transmission.
zeliuq
 
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Re: Tx power management

by zeliuq Fri Sep 11, 2015 8:07 am

Thank you for your prompt response.
Still another question, when we are powering the TD module at 3V (instead of 3,3V) do we still get 14dBm as Tx power?
if not, is there a way to achieve those 14dBm with 3V as power supply?
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lcheminade
 
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Re: Tx power management

by lcheminade Mon Sep 14, 2015 8:10 am

No you're going to lose 0.5dBm per 300mV down to 2.1V. And unless using a regulator there is nothing you can do about it.
zeliuq
 
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Re: Tx power management

by zeliuq Mon Sep 14, 2015 8:47 am

I'm not sure I understand what you mean by "unless using a regulator". I actually plan to use a regulator with a 3V fixed output to power the entire system. Would I still get those 14dBm that way?
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lcheminade
 
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Re: Tx power management

by lcheminade Mon Sep 14, 2015 9:58 am

I meant using a 3.3V regulator.
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