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Total 4 documents matching your query.

1. LF: {Spam?} Active_antennas (score: 1): Author: "Walter Blanchard" <[email protected]>; Date: Sun, 05 Feb 2006 10:17:43 +0100; The theory behind the "height gain" observed using small LF active antennas at different heights has to do with compression of the near-earth LF potential gradient caused by the grounded "mast" holdi; /rsgb_lf_group-archives/html/rsgb_lf_group/2006-02/msg00386.html (10,069 bytes)
2. Re: LF: {Spam?} Active_antennas (score: 1): Author: "John RABSON" <[email protected]>; Date: Sun, 05 Feb 2006 11:31:57 +0100; G8DSU has been doing some measurements on height gain at UHF and is also interested in active antennas at LF for cave radio purposes. I will copy this to him because I'm not sure whether he is curren; /rsgb_lf_group-archives/html/rsgb_lf_group/2006-02/msg00389.html (11,036 bytes)
3. Re: LF: {Spam?} Active_antennas (score: 1): Author: Stewart Bryant <[email protected]>; Date: Mon, 06 Feb 2006 07:40:38 +0000; Isn't there also a shielding effect that needs to be considered? Once the antenna is the highest object in the area, I can see that extra height might be a marginal effect. However as the antenna is; /rsgb_lf_group-archives/html/rsgb_lf_group/2006-02/msg00411.html (11,345 bytes)
4. Re: LF: {Spam?} Active_antennas (score: 1): Author: "Roelof Bakker" <[email protected]>; Date: Mon, 6 Feb 2006 17:57:09 +0100; Hello Stewart, I have tested this on an open perfectly flat country site. The test site was located on an inland dyke, which itself was 6 metre above the surrounding fields. Raising the antenna gave; /rsgb_lf_group-archives/html/rsgb_lf_group/2006-02/msg00420.html (10,323 bytes)

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