# Ais\_rx

**URL:** <https://www.ruby-forum.com/t/ais-rx/234431>\
**Category:** GNU Radio\
**Created:** [March 4, 2015, 12:17pm UTC](https://www.ruby-forum.com/t/ais-rx/234431 "2015-03-04T12:17:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [March 4, 2015, 12:17pm UTC](https://www.ruby-forum.com/t/ais-rx/234431/1 "2015-03-04T12:17:00Z")

</div>

hello

i’m trying to work with gr-ais gui and after ais\_rx runing i have  
message  
above:

mint@mint ~/src/gr-ais/apps $ ais\_rx

linux; GNU C++ version 4.8.2; Boost\_105400;  
UHD\_003.008.001-105-g91ae742f

– Operating over USB 3.

– Initialize CODEC control…

– Initialize Radio control…

– Performing register loopback test… pass

– Performing CODEC loopback test… pass

– Asking for clock rate 32.000000 MHz…

– Actually got clock rate 32.000000 MHz.

– Performing timer loopback test… pass

– Setting master clock rate selection to ‘automatic’.

– Tune Request: 162.000000 MHz

– The RF LO does not support the requested frequency:

– Requested LO Frequency: 162.000000 MHz

– RF LO Result: 162.000000 MHz

– Attempted to use the DSP to reach the requested frequency:

– Desired DSP Frequency: -0.000000 MHz

– DSP Result: -0.000000 MHz

– Successfully tuned to 162.000000 MHz

–

Tuned to 162.000MHz

Setting gain to 36

Gain is 36

Rate is 250000

Using Volk machine: avx\_64\_mmx\_orc

---

<div class="post-metadata">

**Author:** ![popolzen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/c0e974/32.png) [@popolzen](https://www.ruby-forum.com/u/popolzen)\
**Post date:** [March 4, 2015, 6:35pm UTC](https://www.ruby-forum.com/t/ais-rx/234431/2 "2015-03-04T18:35:21Z")

</div>

Possible reasons:

1. Inadequate antenna
2. No line of sight to transmitting ships
3. Incorrect subdevice or antenna specification

–n

On Wed, Mar 4, 2015 at 3:15 AM, Vladimir M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)