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jgh2(at)charter.net
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 Posted: Mon Apr 20, 2009 2:17 pm Post subject: Com Antenna Question |
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The aircraft com antennas I'm familiar with are "open" when an ohmmeter is
used to test for continuity between the active element and ground
connection. However a Dorne & Margolin DM C 70-1/A antenna indicated a
"short" when tested this way. Is it defective or does it contain elements
that conduct at DC but provide the proper impedance at com frequencies?
Jack H.
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nuckolls.bob(at)aeroelect
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| Posted: Mon Apr 20, 2009 6:38 pm Post subject: Com Antenna Question |
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At 05:15 PM 4/20/2009, you wrote:
| Quote: |
The aircraft com antennas I'm familiar with are "open" when an ohmmeter is
used to test for continuity between the active element and ground
connection. However a Dorne & Margolin DM C 70-1/A antenna indicated a
"short" when tested this way. Is it defective or does it contain elements
that conduct at DC but provide the proper impedance at com frequencies?
|
The antennas least vulnerable to precipitation
static have DC continuity to ground. What you're
seeing is the DM antenna is probably normal. The
only reliable way to "scope" an antenna is with
some measure of impedance at the operating frequency.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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