Showing posts with label erp. Show all posts
Showing posts with label erp. Show all posts
14 Jan 2020

ERP solutions? - NOT amateur radio

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Today I got an email advertising Microsoft's ERP solutions. OK, I have been retired now for almost 12 years, but I have no idea at all...
21 Oct 2014

472kHz ERPs

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Something seems wrong to me in that the difference between reports I give and I get on 472kHz WSPR suggests either my ERP is higher than I ...
1 comment:
18 Aug 2014

ERPs on 472kHz

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I am pretty confident of my "just less than 5mW ERP" on 472kHz (with the very short Marconi) and am a bit suspicious of the claime...
14 Aug 2014

ERP calculation on 472kHz

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In an attempt to establish my ERP on 472kHz, I have crunched some numbers. I think it is error free, but no doubt someone will soon tell me!...
15 Mar 2014

472kHz ERP over-estimates?

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Looking at the reports I send and receive, I wonder if several stations are actually using a LOWER ERP than they think? From measurements I ...

New seasonal DX record on 474.2kHz last night

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Last night I received several spots from DL4RAJ at 990km,which is a record, so far this year, for my QRP WSPR signals on 474.2kHz. I am hop...
14 Mar 2014

EIRP calculation on 472kHz band

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So I plugged my measured figures into the equations to work out ERP on the 472kHz band with the very low height Marconi.  Measured antenna c...
20 Jun 2013

How much am I RADIATING at VLF?

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As a matter of interest, this afternoon I worked out how much power I am actually radiating when carrying out my earth-mode tests. The main...
25 Jan 2013

137.766kHz ERP - now measured at 6.6uW

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So, today I repeated my field measurements to establish the ERP of my 8W 137.766kHz beacon feeding my earth-electrode antenna. This time I d...
24 Jan 2013

My ERP on 137.766kHz is.......

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Thanks to G4FEV , I've just realised that I made a fundamental mistake measuring my field strength, forgetting to turn off the AGC when ...
23 Jan 2013

Checking my 137.766kHz ERP by measuring field strength

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Well, today has been a bit of a disappointment: my QRP QRSS3 beacon has been running for over a day on 137.766kHz and, apart from my own hig...
21 Jan 2013

New ERP calculations on 472kHz with earth-electrode antenna in 8cm snow

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With several repeatable ground wave reports on 472kHz WSPR using the earth-electrode antenna, it is time for a recalculation of my ERP based...
2 comments:
12 Nov 2011

Ten WSPR reports now on 137.5kHz

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This evening G3WCB (101km) reported my 137.5kHz WSPR signal for the first time bringing my total number of reports on this more difficult b...
31 Aug 2011

What is my ERP currently on 137kHz WSPR?

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Based on some measurements and calculations using the improved ATU (see photo) today, this is my calculation: Measured antenna current in ...

137/500kHz ERP improvements

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Today I made a start on improving my ERP on 137kHz and 500kHz. Firstly, I've bought a pile of Wima 1000V polypropylene capacitors from...
1 comment:
11 Jan 2011

ERP with the loop on 136kHz

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Today I did a recalculation of my 136kHz ERP using the loop antenna with my WSPR transverter. I have a small RF ammeter in series with the l...
1 comment:
26 Sept 2010

500kHz ERP with the vertical loop antenna

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Results on 500kHz WSPR with the vertical 80sq m area loop (made from 1mm diameter wire) are very good with signal reports from G3XIZ this ev...
23 Jan 2010

ERP on 500kHz (part 2)

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Yesterday I did a recalculation of the G3XBM ERP based on the classic formula and re-measurements of my antenna current. My antenna is a 5m ...
22 Jan 2010

ERP calculation on 500kHz

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I've recalculated my ERP based on a better measurement of antenna current. I was using a dust iron core for my current transformer, so s...
2 comments:
1 Nov 2009

New 500kHz ERP calculation

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Some weeks ago Jim Moritz M0BMU made an estimate of my 500kHz ERP based on received signal strength levels at his QTH 69kms away. As I'...