Update magloop.html

pull/2/head
miguel 2021-09-24 15:12:29 +10:00
rodzic b031d491ed
commit 04bad2f00b
1 zmienionych plików z 5 dodań i 4 usunięć

Wyświetl plik

@ -88,10 +88,11 @@
<li>c/a : is the spacing ratio; based on 'c' being the inter-winding spacing for multi-turn loops measured between conductor centers, and 'a' is the conductor diameter. (Must be >= 1.1)
A low-value will increase the resistance due to the proximity effect. (Ignore for single-turn loops.)</li>
<li>Tx : The transmit power in Watts. This affects the predicted voltage across the capacitor (Vcap), and the RMS loop current (Ia).</li>
<li>Re : Additional resistance due to external losses, due mainly from capacitor contact resistance and proximity-to-ground effects. Use Re=0.0 to assume the loop is in free-space.
Adding Re will reduce antenna efficiency, Q, Vcap and Ia, while increasing BW.
According to [1] and [2], a 1 m diameter loop of 22 mm copper tubing at a height of 1.5 m above the ground at 7 MHz had a calculated capacitor contact resistance of ~190m&#937;
and an additional ground proximity loss resistance of ~30m&#937;. Note that ground losses are dependent on both frequency and height-above-ground.</li>
<li>Re : Additional resistance due to external losses, due mainly from capacitor contact resistance and proximity-to-ground effects.
Use Re=0.0 to assume the loop is in free-space with no capacitor losses (i.e. ideal conditions, with loop-related losses only).
Adding Re will reduce antenna efficiency, Q, Vcap and Ia, while increasing antenna BW.
According to [1] and [2], a 1 m diameter loop of 22 mm copper tubing at a height of 1.5 m above the ground operating at 7 MHz had a calculated capacitor contact resistance of ~190 m&#937;
and an additional ground proximity loss resistance of ~30 m&#937;. Note that true ground losses are dependent on both frequency and height-above-ground.</li>
<li>Metric or Imperial : selects the measuring system.</li>
<li>Cu or Al : selects the type of metal conductor (annealed copper or aluminum).</li>
<li>Circ, Oct, Hex or Sqr : selects the shape of the magloop.</li>