Message-ID: <4E386F31.10900@iup.uni-heidelberg.de>
Date: Tue, 02 Aug 2011 23:42:09 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Fieldstrength and radiated power
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Thanks Markus,

Will try now if it works and see what my level will be ;-) Good for PA 
adjustments, at least in times without a skywave component. Anyway...

So, do we have to send a longer dash or acidentally transmit to the 
right time? :-)

73, Stefan/DK7FC

Am 02.08.2011 18:26, schrieb Markus Vester:
> Dear LF,
> to support estimates of radiated power, I have added a fieldstrength 
> readout on my LF grabber
> http://www.alice-dsl.net/df6nm/grabber/Grabber.htm
> It simply displays the peak frequency and amplitude within the QRSS 
> subband at the time of the capture (ie. every five minutes). Due to 
> different calibration issues, the readout will be accurate only to 
> within about 3 dB. There may also be considerable day-to-day 
> variation, for example from switching between different receive antennas.
> In the region of groundwave dominance (up to 400 km daytime, 200 km in 
> darkness), radiated power in dBm or milliwatts can be roughly 
> estimated based on distance R using
>  EMRP[dBm] = 20 log E[uV/m] + 20 log R[km] + 0.02 R[km] - 49.5
>  EMRP[mW] = 10^(EMRP[dBm]/10)
> To convert to halfwave-dipole ERP or EIRP, you would have to apply the 
> usual factor of 1.83 or 3.
> Hope this may be useful...
> Best 73,
> Markus (DF6NM)
>
>

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Thanks Markus, <br>
<br>
Will try now if it works and see what my level will be ;-) Good for PA
adjustments, at least in times without a skywave component. Anyway...<br>
<br>
So, do we have to send a longer dash or acidentally transmit to the
right time? :-)<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 02.08.2011 18:26, schrieb Markus Vester:
<blockquote
 cite="mid:8CE1F480AFAA39A-BE4-3E91@webmail-d146.sysops.aol.com"
 type="cite"><font color="black" face="arial" size="2">
  <div>Dear LF,</div>
  <div>&nbsp;</div>
  <div>to support estimates of radiated power, I have added a
fieldstrength readout on my LF grabber </div>
  <div>&nbsp;</div>
  <div>&nbsp;<a moz-do-not-send="true"
 href="http://www.alice-dsl.net/df6nm/grabber/Grabber.htm">http://www.alice-dsl.net/df6nm/grabber/Grabber.htm</a></div>
  <div>&nbsp;</div>
  <div>It simply displays the peak frequency and amplitude within the
QRSS subband at the time of the capture (ie. every five minutes). Due
to different calibration issues, the readout will be accurate only to
within about 3 dB. There may also be considerable day-to-day variation,
for example from switching between different receive antennas.</div>
  <div>&nbsp;</div>
  <div>In the region of groundwave dominance (up to 400 km daytime, 200
km in darkness), radiated power in dBm or milliwatts can be roughly
estimated based on distance R using</div>
  <div>&nbsp;</div>
  <div>&nbsp;EMRP[dBm] = 20 log E[uV/m] + 20 log R[km] + 0.02 R[km] - 49.5</div>
  <div>&nbsp;EMRP[mW] = 10^(EMRP[dBm]/10)</div>
  <div>&nbsp;</div>
  <div>To convert to halfwave-dipole ERP or EIRP, you would have to
apply the usual factor of 1.83 or 3.</div>
  <div>&nbsp;</div>
  <div>Hope this may be useful...</div>
  <div>&nbsp;</div>
  <div>Best 73,<br>
Markus (DF6NM)<br>
  <br>
  <br>
  </div>
  </font>
</blockquote>
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