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You could increase your bandwidth slightly - obviously not so much
that you have the other channel bleeding into the one you are locked
onto. I have the cheapest R820T2's in use 24/7 for another project
and I have not needed to adjust them for over 2 years. I would
suggest using rtl_tcp on the pi in order to check your ppm instead
of moving it to a different machine. Once set then maybe recheck in
a week's time and see how much it has moved.<br>
<br>
<div class="moz-cite-prefix">On 12/01/2021 8:25 p.m., Craig wrote:<br>
</div>
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cite="mid:f2f76b47-49a4-bc50-10fb-dfb8a04dc964@orcon.net.nz"
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<p>Something to be aware of Brendan - SDRs seem to drift with heat</p>
<p>Find myself re-tuning the offset +/- a few Hz every couple of
months. Local decodes will start to degrade, or overall hit rate
decrease. And some end up with inability to correctly complete
decode. (or drop the likes of amb)<br>
</p>
<p>Soon as I find the right offset or slightly off frequency to
centre it again using the PC, and transfer back to the Pi again.
Away it goes again.<br>
</p>
<div class="moz-cite-prefix">On 12/01/2021 7:57 pm, Brendan Sheehy
wrote:<br>
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Mine is all sdr with outdoor antenna <span
id="ms-outlook-android-cursor"></span><br>
<br>
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"> Get <a href="https://aka.ms/ghei36"
moz-do-not-send="true">Outlook for Android</a></div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
color="#000000" face="Calibri, sans-serif"><b>From:</b>
TheList <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:thelist-bounces@radiowiki.org.nz"><thelist-bounces@radiowiki.org.nz></a>
on behalf of Radio Scanner <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:rs157950@gmail.com"><rs157950@gmail.com></a><br>
<b>Sent:</b> Tuesday, January 12, 2021 6:09:43 PM<br>
<b>To:</b> <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:thelist@radiowiki.org.nz">thelist@radiowiki.org.nz</a>
<a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:thelist@radiowiki.org.nz"><thelist@radiowiki.org.nz></a><br>
<b>Subject:</b> Re: [TheList] Pager Decoding</font>
<div>�</div>
</div>
<div style="background-color:#FFFFFF">Whats the hardware setup
you are using Brendan? Also internal/external Antenna? I just
wonder if by using an outdoor Antenna im receiving too many
towers and they are out of sync and causing corrupted data -
thus the slightly lower decode rate?<br>
<br>
<div class="x_moz-cite-prefix">On 12/01/2021 12:47 p.m.,
Brendan Sheehy wrote:<br>
</div>
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<p class="x_MsoNormal">It will just need some very fine
adjustments.</p>
<p class="x_MsoNormal">�</p>
<p class="x_MsoNormal">I would highly recommend using the
Line In not the Microphone as windows does all sorts of
funny things with the mics</p>
<p class="x_MsoNormal">�</p>
<p class="x_MsoNormal">The 3 i�m monitoring vary greatly
between 52 � 100%</p>
<p class="x_MsoNormal">�</p>
<p class="x_MsoNormal">Cheers</p>
<p class="x_MsoNormal">�</p>
<p class="x_MsoNormal">Brendan</p>
<p class="x_MsoNormal">�</p>
<p class="x_MsoNormal">Sent from <a
href="https://go.microsoft.com/fwlink/?LinkId=550986"
moz-do-not-send="true"> Mail</a> for Windows 10</p>
<p class="x_MsoNormal">�</p>
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<p class="x_MsoNormal" style="border:none; padding:0cm"><b>From:
</b><a href="mailto:rs157950@gmail.com"
moz-do-not-send="true">Radio Scanner</a><br>
<b>Sent: </b>Monday, 11 January 2021 10:00 AM<br>
<b>To: </b><a href="mailto:thelist@radiowiki.org.nz"
moz-do-not-send="true">thelist@radiowiki.org.nz</a><br>
<b>Subject: </b>Re: [TheList] Pager Decoding</p>
</div>
<p class="x_MsoNormal">�</p>
<p class="x_MsoNormal" style="margin-bottom:12.0pt">What's
your gain set at? Shouldn't need any more than 1/3rd the
way up the scale tbh. Hopefully someone else can chime
in (Brendan?) and tell us what their decode rate is as
it would appear to be a system problem rather than ours.</p>
<div>
<p class="x_MsoNormal">On 10/01/2021 9:21 p.m.,
DogSecurity - Richard wrote:</p>
</div>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<p class="x_MsoNormal">Yeah could give that a shot. My
plan was to move down south but then the lockdowns
happened and work got busy, so the place I moved into
is a temp setup (my aerial is the old VHF TV aerial
that noone has removed yet)<br>
<br>
I assume the SDR on a crap aerial is the probable
cause of a low decode rate, however when listening to
the channel, it appears I'm decoding everything/nearly
everything, hence ignoring the decode rate. </p>
<p class="x_MsoNormal"><img
id="x_Horizontal_x0020_Line_x0020_1"
src="cid:part9.08060902.05090401@gmail.com"
style="width:6.375in; height:.0104in" class=""
border="0" height="1" width="612"></p>
<p class="x_MsoNormal" style="margin-bottom:12.0pt">Sent
from a mobile device. Please excuse my brevity,
punctuation and spelling. </p>
<div>
<p class="x_MsoNormal">On 10 January 2021 4:16:58 pm
NZDT, Radio Scanner <a
href="mailto:rs157950@gmail.com"
moz-do-not-send="true"> <a class="moz-txt-link-rfc2396E" href="mailto:rs157950@gmail.com"><rs157950@gmail.com></a></a>
wrote: </p>
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#CCCCCC 1.0pt; padding:0cm 0cm 0cm 6.0pt;
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<p class="x_MsoNormal" style="margin-bottom:12.0pt">Interesting
you mention such a low decode rate Richard, I
noticed my decode rate drop a couple years ago
from 99-100% to 35-40%, despite my setup not
changing in the past ~8 years. Uniden scanner with
disc tap feeding a 2 level slicer on the serial
port. Another machine runs a SDR dongle on the 925
channel into a 2 level slicer from the audio
output. This channel's decode rate is anywhere
from 20-25% with an average number of messages.
You might try using the command line rtl_fm
program instead of SDR# / SDRConsole.</p>
<div>
<p class="x_MsoNormal">On 10/01/2021 3:47 p.m.,
DogSecurity - Richard wrote:</p>
</div>
<blockquote style="margin-top:5.0pt;
margin-bottom:5.0pt">
<p class="x_MsoNormal">Hey Mike,<br>
<br>
I'd say that it's probably your volume levels.
I've never done the discriminator tap, which may
have made things harder, but getting the
computer volume and scanner volume just right is
nothing short of a pain in the ass.<br>
<br>
Right now, I'm temporarily using an SDR dongle.
The volumes are (SDRsharp keeps crashing on me
so I'm using software called SDR Console) 100%
output on the software, 61% on the VAC input.
This gives me an average of about a 40% decode
rate according to PDW 3.2b01, however I
physically seem to be decoding a lot of messages
so I'm ignoring that decode rate </p>
<p class="x_MsoNormal"><img
id="x_Horizontal_x0020_Line_x0020_2"
src="cid:part11.01070706.00010903@gmail.com"
style="width:5.3125in; height:.0104in"
class="" border="0" height="1" width="510"></p>
<p class="x_MsoNormal"
style="margin-bottom:12.0pt">Sent from a mobile
device. Please excuse my brevity, punctuation
and spelling. </p>
<div>
<p class="x_MsoNormal">On 10 January 2021
2:04:22 pm NZDT, Mike Trump <a
href="mailto:mtrump@orcon.net.nz"
moz-do-not-send="true">
<a class="moz-txt-link-rfc2396E" href="mailto:mtrump@orcon.net.nz"><mtrump@orcon.net.nz></a></a> wrote: </p>
<blockquote style="border:none;
border-left:solid #CCCCCC 1.0pt; padding:0cm
0cm 0cm 6.0pt; margin-left:4.8pt;
margin-right:0cm">
<pre>Hi Guys,</pre>
<pre>Happy New Year to one and all.</pre>
<pre>I have a little query regarding pager decoding using the PDW software </pre>
<pre>and I'm not sure if it's a setting that's wrong</pre>
<pre>or the way I've set this up.</pre>
<pre>For years I used this program to monitor the Fire Service FLEX paging on </pre>
<pre>157.9500, using a Uniden UBC-9000 scanner</pre>
<pre>via a discriminator tap I'd installed in it and it worked good as gold, </pre>
<pre>until one day the scanner just stopped</pre>
<pre>receiving anything at all (it's on the list of things to fix, once I get </pre>
<pre>around to it).</pre>
<pre>Today I tried the software again, just out of curiosity with a handheld </pre>
<pre>scanner plugged into my laptop microphone</pre>
<pre>input, I'm pretty sure I have all the audio levels correct and the </pre>
<pre>software is running fine, but it won't decode anything?</pre>
<pre>I got a few POCSAG messages but that was it, have I messed something up </pre>
<pre>here?</pre>
<pre>Does anyone else here use a setup like this?</pre>
<pre>�</pre>
<pre>Cheers,</pre>
<pre>Mike Trump.</pre>
<pre><img id="x_Horizontal_x0020_Line_x0020_3" src="cid:part13.02000901.03000509@gmail.com" style="width:5.25in; height:.0104in" class="" border="0" height="1" width="504"></pre>
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