Return to KLUBNL.PL main page
| To: | [email protected] |
|---|---|
| Subject: | Re: LF: RE: New personal QRP DX record on 500kHz: 1733km |
| From: | Roger Lapthorn <[email protected]> |
| Date: | Thu, 21 Oct 2010 13:05:37 +0100 |
| Dkim-signature: | v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=oGzy4WBm2GJMpGvE8PDEi2toBBVqr+3H0pVF7e7e70o=; b=WTxknJnzHFI3MBEYCdfqUZ/UQ9PPuflOW1ADnL4PKiX4Q6pcSyf51La1yXm/XEk2pO phK9J+WdLFuhNmd1zu1tTCpki4FRsxh79aj9dW7j6W3tL9gW6aNFD7ebNvyZIi8vjLws n7fa3GnyutbyBeDmGE3NlXgJew35STQX4MtT0= |
| Domainkey-signature: | a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=Cd334xH5tskmxPp0sEmlEDK6/LC4vDs7VtKp6hsWDPz/6NDwh2O7DKfeTucWgfnGTg xsxW9w7O1JEyoePja28Ku74Cew2aGwtbl7py0E7SF3t9g6+erDl4O/XE8VUuinxSJyen TcqtM+5ktgRtXt+c4EwEEIBGqGKOkcH3WZvHM= |
| Domainkey-status: | good (testing) |
| In-reply-to: | <BF4A524700075746A6467658DFC7102C886E0FF4F4@ICTS-S-EXC2-CA.luna.kuleuven.be> |
| References: | <[email protected]> <BF4A524700075746A6467658DFC7102C886E0FF4F4@ICTS-S-EXC2-CA.luna.kuleuven.be> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
|
No, the 500kHz TX, ATU and loop antenna are as they were a few weeks ago Rik and I am suprised how well this all works. The transverter (on my website) TX produces 5W from an IRF510 and this is fed to a vertical wire loop in the garden tuned with a capacitance decade box for maximum loop current. The loop is supported at the house end by the aluminium poll used to support the 28MHz halo (about 9m above ground at highest). The wire runs about 17m down to a tree where the far end is about 4m above ground. Then it runs down to the lawn and runs back along the ground (buried in the long grass that is wet and needs cutting) to the house. The feed is via an upstairs bedroom window with the ATU on the bedroom table. In all, the loop area is about 70 square metres. The wire is PVC covered 1mm diameter wire. The experts tell me I should raise the bottom of the loop above the ground, but just resting it on the wet grass doesn't seem to be doing too bad. The grass is about 10cm long at the moment as it is too wet to cut and we were away in South Africa for the last few weeks. I can increase the wire diameter soon which will increase the loop current some 3dB. I'd be interested to know what you believe my ERP is. My last calculation came out around 2mW. This evening I shall be back on 137.5kHz WSPR with the same antenna and ATU, although the ERP on 137.5kHz is much lower and almost certainly not more than 100uW at very best. 73s Roger G3XBM On 21 October 2010 07:47, Rik Strobbe <[email protected]> wrote:
-- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | LF: RE: New personal QRP DX record on 500kHz: 1733km, Rik Strobbe |
|---|---|
| Next by Date: | Re: LF: RE: New personal QRP DX record on 500kHz: 1733km, Stefan Schäfer |
| Previous by Thread: | LF: RE: New personal QRP DX record on 500kHz: 1733km, Rik Strobbe |
| Next by Thread: | Re: LF: RE: New personal QRP DX record on 500kHz: 1733km, Stefan Schäfer |
| Indexes: | [Date] [Thread] [Top] [All Lists] |