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Bug #3342

osmo-trx-lms: low tx output power level

Added by laforge 3 months ago. Updated 5 days ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
LimeSDR
Target version:
-
Start date:
06/13/2018
Due date:
% Done:

0%

Estimated time:
Spec Reference:

Description

According to https://discourse.myriadrf.org/t/limesdr-s-maximum-transmitting-power-at-different-frequencies/1649 I would expect something like 3-5dBm maximum output power at 1.8 GHz.

Hoewever, when running at ARFCN 871, and even when manually patching LMS_SetNormalizedGain(m_lms_dev, LMS_CH_TX, chan, 1.0); into the osmo-trx-lms source code, I'm not seeing more than -3.8 dB coming out of the TX1_1 port of the device. Where does that 6..8 dB difference come from?


Related issues

Related to OsmoTRX - Feature #2919: Native LimeSDR supportResolved2018-02-09

History

#1 Updated by laforge 3 months ago

#2 Updated by duo_kali 5 days ago

Tested also with 900MHZ, seems the output power and rx gain using osmo-trx-lms is less compare using osmo-trx legacy 0.20 (with UHD).

I dont have the spectum analyzer here, but testing many times and compare using phone to camp and call with osmo-trx legacy which osmo-trx 0.20 has produce more power, so automatically get more distance range coverage.

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