New to Ham Radio?
DX Cluster Spots
eHam Help (FAQ)
Support the site
The eHam Team
Show all reviews of the Yaesu ATAS-100
You can write your own review
of the Yaesu ATAS-100.
May 7, 2011 10:05
Send this review to a friend!
OK on some bands
Time owned: more than 12 months
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.
Martin - G8JNJ
Product is in production.
You are not subscribed to this review.
If you have any questions, problems, or suggestions about Reviews
please email your Reviews Manager