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Categories | Antennas: HF Mobile & Accessories | Yaesu ATAS-100 Help

Show all reviews of the Yaesu ATAS-100

You can write your own review of the Yaesu ATAS-100.

G8JNJ  Rating: 3/5 May 7, 2011 10:05  Send this review to a friend!
OK on some bands  Time owned: more than 12 months
Hi All,

Finally got around to measuring the loss associated with the loading coil on this antenna.

Measured the field strength with a spectrum analyser in comparision to a 1/4 wave vertical. Both antennas ground mounted and fed against 10 mixed length buried radials. Ground loss resistance measured as 15 Ohms.

Used EZNEC to calculate theoretical gain difference between antenna same size as ATS 100 and 1/4 wave.

Used these values and mesured difference in field strength to estimate loss in tuning coil.

7.0MHz approx 6.5dB Loss
10.1MHz approx 6.7dB Loss
14.1MHz approx 2.3dB Loss
18.1MHz approx 0.8dB Loss
21.1MHz approx 0.4dB Loss
24.9MHz approx 0.3dB Loss
28.5MHz approx 1.5dB Loss
50.5MHz approx 0.8dB Loss

Looks like performance has been optimised for mid HF bands.

I would expect the ATS 120 to be similar.

Regards,

Martin - G8JNJ

www.g8jnj.webs.com


 
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