[Hallicrafters] Dummy antenna for S40 alignment

[David C. Hallam]

Paul,

This is a description of a RMA dummy antenna from the URM-25D signal manual.

b. The circuit consists of a 200 micromicrofarad
capacitor (C-401) in series with a series-parallel arrangement
consisting of a 400 micromicrofarad capacitor (C-402), a 400
ohm resistor (R-401 ), and a 20 microhenry inductor (L-401 ).
At frequencies above 2.5 megacycles, the antenna simulator
unit acts like a pure resistance of from 220 ohms to 400
ohms. Below 1.6 megacycles, the circuit acts like a
capacitance of 200 micromicrofarads in series with an
inductance of 20 microhenries and a resistance of 15 ohms.

73
David C. Hallam
KC2JD


-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Paul Buhler
Sent: Friday, December 10, 2004 12:54 PM
To: Hallicrafters at mailman.qth.net
Subject: [Hallicrafters] Dummy antenna for S40 alignment

In the instruction manual for the s40b it says to use an RMA dummy antenna
when doing the alignment, my question is, is the dummy antenna necessary to
do the alignment and if so where can I find a schematic or diagram for its
construction. Thanks.
Paul VE6RTR


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