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| To: | "LF-Group" <[email protected]> |
|---|---|
| Subject: | LF: Field strength of PA0SE and DCF39 |
| From: | "Dick Rollema" <[email protected]> |
| Date: | Wed, 17 Dec 2003 15:44:18 +0100 |
| Reply-to: | [email protected] |
| Sender: | <[email protected]> |
|
To All from PA0SE, This morning I measured the field strength of my transmitter again, after improving the insulation at the feed-through of the aerial to the shack, using the centre conductor plus insulation of RG-213 coax, surrounded by a paxolin tube through the hard wood window frame. In the open countryside at 5.83km from the aerial field strength was 610 microvolt/m. From this follows a radiated power of 140mW EMRP. Transmitter output 300W Aerial current 3.2A From this follows: Total resistance in the aerial-earth system is 300/(3.2 x 3.2) = 29.3 ohm. Loss resistance in the coil 9.3 ohm. Earth resistance 29.3 - 9.3 = 20 ohm. When measuring FS I always measure the FS of DCF39 as well. This morning I found FS = 1.29mV/m in the countryside. This is remarkably low. On 12 April 2000 I found 1.93mV/m On 4 December 2003 it was 2.13mV/m. But when I measured FS in the afternoon in the shack it was back at 2.13 mV/m again. (On an earlier occasion I have found that FS of DCF39 in the shack does not differ from what I measure in the open country, which is rather remarkable.) So it seems DCF39 suffered a temporary power reduction this morning. 73, Dick, PA0SE |
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