References: <4A181EEC.5050600@btconnect.com>
To: rsgb_lf_group@blacksheep.org
Date: Sat, 23 May 2009 15:19:22 -0400
In-Reply-To: <4A181EEC.5050600@btconnect.com>
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From: g0mrf@aol.com
Message-Id: <8CBA9F282F0E172-BD8-2E43@webmail-mf12.sysops.aol.com>
Subject: Re: LF: First Portable Trip
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Hi Richard.

I've used a system similar to yours with some success.? Mine, now dismantled, is detailed at

http://www.g0mrf.com/500kAntenna.htm

It was a 10m mast with a very small 3m top section. Power in 7.5W PEP.
100km was no problem 24/7 with good conditions it made it to ON and PA.? With very good conditions it made it to?the Scotish Islands at apx 800km but that was rare.

The photo shows a variometer in series with a fixed coil in series with another fixed coil which was connected to ground at the bottom end.? Despite all these turns of wire, the 50 ohm match was only a few turns up from the ground end.

Hope that helps.

David




-----Original Message-----
From: Richard Newstead <g3cwi@btconnect.com>
To: rsgb_lf_group@blacksheep.org
Sent: Sat, 23 May 2009 16:06
Subject: LF: First Portable Trip


Not a great success. Tried a 200ft inverted L with 7m vertical section fed against 3 radials each between 50 and 100ft long. The final 100ft was very low - within 1 metre of the ground.?
?
Did not succeeded in tuning aerial up in link configuration. Tried tapping the feeder at various points on the main coil but this reduced the Q dramatically and the RX and TX performance were very poor. In configurations where the RX performance was good and the Q high, there was little on no aerial current on transmit. The only configuration that gave some antenna current was nearly useless on receive. Connecting a radial to a metal fence detuned things so much that I go nowhere like that.?
?
Heard GW0HXO's beacon at reasonable strength and GW3UEP's beacon - just. Called CQ quite a few times. No takers.?
?
Band was still noisy even on relatively remote hilltop with horrible "line-timebase" type burble drifting across band.?
?
Clearly more work required to get a viable system. Tips??
?
73?
?
Richard?
G3CWI?
?


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Hi Richard.<br>
<br>
I've used a system similar to yours with some success.&nbsp; Mine, now dismantled, is detailed at<br>
<br>
<A href="http://www.g0mrf.com/500kAntenna.htm">http://www.g0mrf.com/500kAntenna.htm</A><br>
<br>
It was a 10m mast with a very small 3m top section. Power in 7.5W PEP.<br>
100km was no problem 24/7 with good conditions it made it to ON and PA.&nbsp; With very good conditions it made it to&nbsp;the Scotish Islands at apx 800km but that was rare.<br>
<br>
The photo shows a variometer in series with a fixed coil in series with another fixed coil which was connected to ground at the bottom end.&nbsp; Despite all these turns of wire, the 50 ohm match was only a few turns up from the ground end.<br>
<br>
Hope that helps.<br>
<br>
David<br>
<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: Richard Newstead &lt;g3cwi@btconnect.com&gt;<br>
To: rsgb_lf_group@blacksheep.org<br>
Sent: Sat, 23 May 2009 16:06<br>
Subject: LF: First Portable Trip<br>
<br>


<div id=AOLMsgPart_0_78e2dcdc-766d-4020-ad9d-16acb341c98c style="FONT-SIZE: 12px; MARGIN: 0px; COLOR: #000; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; BACKGROUND-COLOR: #fff">Not a great success. Tried a 200ft inverted L with 7m vertical section fed against 3 radials each between 50 and 100ft long. The final 100ft was very low - within 1 metre of the ground.&nbsp;<br>
&nbsp;<br>
Did not succeeded in tuning aerial up in link configuration. Tried tapping the feeder at various points on the main coil but this reduced the Q dramatically and the RX and TX performance were very poor. In configurations where the RX performance was good and the Q high, there was little on no aerial current on transmit. The only configuration that gave some antenna current was nearly useless on receive. Connecting a radial to a metal fence detuned things so much that I go nowhere like that.&nbsp;<br>
&nbsp;<br>
Heard GW0HXO's beacon at reasonable strength and GW3UEP's beacon - just. Called CQ quite a few times. No takers.&nbsp;<br>
&nbsp;<br>
Band was still noisy even on relatively remote hilltop with horrible "line-timebase" type burble drifting across band.&nbsp;<br>
&nbsp;<br>
Clearly more work required to get a viable system. Tips?&nbsp;<br>
&nbsp;<br>
73&nbsp;<br>
&nbsp;<br>
Richard&nbsp;<br>
G3CWI&nbsp;<br>
&nbsp;<br>
</div>
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