<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi Everyone,</div><div><br></div>Thanks for the signal strength comparison chart John, it certainly saved me looking it up.<div><br></div><div>The antenna is mounted mid roof of my workshop roof being 20m x 24m x 6m high and work much better with extended whip on 160, 80 & 40</div><div><br></div><div>Regards</div><div>Peter</div><div>VK3YZP<br><br><div dir="ltr">Sent from my Phone<div><br><div><br></div></div></div><div dir="ltr"><br><blockquote type="cite">On 3 Jul 2021, at 19:44, John & Bronwyn <jandbmorrissey@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<p>Net opened at 20:30 hrs on 3600 kHz with VK3ZRX as Net Control. <br>
</p>
<p>Checkins:</p>
<p>Mark VK3MDH /P Cobram, 59, reports lots of Vicpol activity along
the NSW / Vic border to do with Covid bans on people entering Vic
from any NSW 'red spot'. <br>
</p>
<p>Paul VK3FPDA, 57, reported poor sigs from everyone<br>
</p>
<p>Rik VK3EQ, 58, check in only, <br>
</p>
<p>John VK3MS Milawa, 59, working on getting his shack set up &
functional</p>
<p>Peter VK3YG Glenmaggie, 59, going interstate for a few days, also
celebrating 57th wedding anniversary. Congrats Peter and Jen!</p>
<p>Peter VK3YZP Alexandra, 58, using a Codan radio with tunable
vertical (a Codan screwdriver with extended whip), reported my sig
as +14dBuV (see below)</p>
<p>All greatly saddened to hear of the passing of long-term WICEN
member Fred VK3JM. Vale Fred. <br>
</p>
<p>Coming events: <br>
</p>
<pre class="moz-quote-pre" wrap="">Saturday August 7th 2021
Gippsland Rally
Heyfield area
Contact: Ross Sargent VK3SF phone: 03 9736 4020
Email: <a class="moz-txt-link-abbreviated" href="mailto:vk3sf@outereast.com.au">vk3sf@outereast.com.au</a>
Sunday August 15th 2021
Commanders & Co-Ordinators Meeting
ZOOM (TBC )
Contact: Ross Sargent VK3SF phone: 03 9736 4020
Email: <a class="moz-txt-link-abbreviated" href="mailto:vk3sf@outereast.com.au">vk3sf@outereast.com.au</a></pre>
<p> Net control next week: Paul VK3DPW</p>
<p>Change of Net Control Roster: With Fred's passing and another
Net Control station not available for the foreseeable future (due
to other commitments), I think it is time to revise the roster.</p>
<p>Anyone interested in being added to the net control roster,
please contact me. It is an interesting role and a valuable
skill to have! <br>
</p>
<p><br>
</p>
<p> And lastly, an explanation of Peter 3YZP's signal report. The
most common signal report is "S" units, with (on HF) S9 defined as
50 uV at the antenna terminals. Then each lower "S" number is
half the signal strength (-6dB) of the one just higher. Another
common specification is the actual signal strength in uV, most
radios are specified in this way for sensitivity. Then there is
dBm, which is the signal level in dB referred to a signal level of
1 mW into 50 ohms (this is about 0.224 volts). <br>
</p>
<p>As well, some radios define signal levels in dB relative to 1uV,
with abbreviation dBu. <br>
</p>
<p> For comparison, here are the various "signal strength" scales:
<br>
</p>
<p>
</p>
<table cellspacing="0" border="0">
<colgroup width="85" span="4"></colgroup> <tbody>
<tr>
<td height="17" align="center">'S’ Units (HF)</td>
<td align="center">uV</td>
<td align="center">dBu</td>
<td align="center">dBm</td>
</tr>
<tr>
<td height="17" align="center">9</td>
<td align="center">50</td>
<td align="center">34</td>
<td align="center">-73</td>
</tr>
<tr>
<td height="17" align="center">8</td>
<td align="center">25</td>
<td align="center">28</td>
<td align="center">-79</td>
</tr>
<tr>
<td height="17" align="center">7</td>
<td align="center">13</td>
<td align="center">22</td>
<td align="center">-85</td>
</tr>
<tr>
<td height="17" align="center">6</td>
<td align="center">6.3</td>
<td align="center">16</td>
<td align="center">-91</td>
</tr>
<tr>
<td height="17" align="center">5</td>
<td align="center">3.2</td>
<td align="center">10</td>
<td align="center">-97</td>
</tr>
<tr>
<td height="17" align="center">4</td>
<td align="center">1.6</td>
<td align="center">4</td>
<td align="center">-103</td>
</tr>
<tr>
<td height="17" align="center">3</td>
<td align="center">0.8</td>
<td align="center">-2</td>
<td align="center">-109</td>
</tr>
<tr>
<td height="17" align="center">2</td>
<td align="center">0.4</td>
<td align="center">-8</td>
<td align="center">-115</td>
</tr>
<tr>
<td height="17" align="center">1</td>
<td align="center">0.2</td>
<td align="center">-14</td>
<td align="center">-121</td>
</tr>
</tbody>
</table>
<p> </p>
<p>And just to confuse things further, there are actually two "S
unit" scales. On HF, S9 = 50 uV. But on V/UHF, S9 = 5 uV. This
makes S1 on V/UHF = -141 dBm - pretty much at the noise floor of a
very good VHF/UHF receiver. So it makes sense. And there are two
dBu scales - the one above which uses 1 uV, and another which uses
0.5 uV as the reference, which is used by some Japanese
manufacturers. <br>
</p>
<p>In practice the "S-unit" scales are nominal, not all
manufacturers follow the "S-unit" standard and even then, radios
often don't follow the scales accurately. <br>
</p>
<p>So my report from Peter of +14dBu was about S6. <br>
</p>
<p>Cheers, John VK3ZRX<br>
</p>
<p><br>
</p>
<span>_______________________________________________</span><br><span>wicenvic mailing list</span><br><span>wicenvic@vic.wicen.org.au</span><br><span>http://vic.wicen.org.au/mailman/listinfo/wicenvic_vic.wicen.org.au</span><br></div></blockquote></div></body></html>