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Re: LF: Re: Mini-Whip Antenna

To: <[email protected]>
Subject: Re: LF: Re: Mini-Whip Antenna
From: "Ken" <[email protected]>
Date: Tue, 18 Jan 2011 22:02:49 -0000
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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> <op.vpitfsuwyzqh0k@pc-roelof>
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Hello Roelof.
Very interesting, I am just about to commission my MiniWhip, the hold up has been several things, firstly winding a high value power take-off inductor, but mainly what to seal the ends of the plastic pipe with to make it really water tight. I assume that you terminate the coax directly onto the pcb, no connectors. How do your experimental J310 bias values compare with the original circuit component values?.This MiniWhip is certainly attracting a lot of attention, at least it will keep the J310 manufacturers busy.

73s and best regards
 Ken
M0KHW


----- Original Message ----- From: "Roelof Bakker" <[email protected]>
To: <[email protected]>
Sent: Tuesday, January 18, 2011 8:20 PM
Subject: Re: LF: Re: Mini-Whip Antenna


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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