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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Re: Mini-Whip Antenna |
| From: | "Roelof Bakker" <[email protected]> |
| Date: | Tue, 18 Jan 2011 21:20:06 +0100 |
| In-reply-to: | <10AF86B6FE9F41D8AC69768CCAEE994D@PcMinto> |
| References: | <[email protected]> <op.vpan5am6yzqh0k@pc-roelof> <[email protected]> <op.vpat3gvlyzqh0k@pc-roelof> <04DC6D14A81F4542B1D2189A5440F3D5@DennisPC> <[email protected]> <277DA8CD9ECE43D989BD77869417F642@DennisPC> <8DBC66D8CECB40DDB2E4630CDD4B20BA@PcMinto> <[email protected]> <10AF86B6FE9F41D8AC69768CCAEE994D@PcMinto> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Opera Mail/11.00 (Win32) |
Hello Minto,In laboratory tests it is possible to tweak the bias of the J310 for a very high IP2 of +80 dBm and a IP3 of +33 dBm. However this does not hold in off air tests.I use the medium wave stations at Orford Ness, UK as off air signal generators. The station at 648 kHz is on 24/7, but the one at 1296 kHz only in part of the morning and between 16:00 and 17:00 UTC. I found IP3's ranging from about + 15dBm to + 20 dBm depending on supply voltage. Maybe you can use these stations as well for test purposes.At my location they produce each -20 dBm at the output of a mini-whip mounted 5 metre up. Except for the directive properties of a loop, both loops and whips can deliver stellar performance on reception. It depends on the local noise situation which type of antenna gives best results. 73, Roelof, pa0rdt |
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