<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Last year our power company changed the meter so they can read it from there office and it seems to be in the VHF area, I havent pin pointed if its a fact yet But I am now getting a large burst I didnt have before.</span></div><div><br></div> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <div style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); height: 0px; line-height: 0; font-size: 0px;" class="hr" contentEditable="false" readonly="true"></div> <font size="2" face="Arial"> <b><span style="font-weight: bold;">From:</span></b> Alan Corey <alancorey@yahoo.com><br> <b><span style="font-weight: bold;">To:</span></b> osmocom-sdr@lists.osmocom.org <br>
<b><span style="font-weight: bold;">Sent:</span></b> Sunday, April 28, 2013 10:43 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Scanning with rtl_fm<br> </font> </div> <div class="y_msg_container"><wbr><div id="yiv0442799057"><table border="0" cellSpacing="0" cellPadding="0"><tbody><tr><td style="font: inherit; font-size-adjust: inherit; font-stretch: inherit;" vAlign="top">I'm using rtl_fm in a scanning (nbfm) situation, and even with the antenna input disconnected and terminated, I get a burst of noise that sounds like a squelch tail maybe once each scan cycle. They're a little over 1 second apart. I've tried setting the squelch up to 10000 where I don't get signals anymore, but I still get the noise.<br><br>I discovered that if you scan and have the output be a raw audio file, nothing gets recorded when nothing breaks squelch. This makes time-lapse recordings where all the pauses are taken out. Very nice,
except for the noise bursts.<br><br>I'm using:<br>#!/bin/sh<br>rtl_fm -N -S -l 132 -p 102 -f 854040000 -f 854240000 -f 854315000 -f 854415000 -f \<br>854490000 -f 854540000 -f 855165000 -f 855240000 -f 858790000 -f 867350000 \<br>-f 867715000 /tmp/`date +"%Y-%m-%d_%H%M.raw"`<br><br>and recorded
overnight, but I mostly got noise bursts.<br><br> Alan<br>-----<br>
Radio Astronomy - the ultimate DX</td></tr></tbody></table></div><wbr><wbr></div> </div> </div> </div></body></html>