Heathkit HD 1422 Manual

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HEATH COMPANY ° BENTON HARBOR, MICHIGAN

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MEASUREMENTS

There are a number of ways you can use your An-
tenna Noise Bridge. (1.) You can measure the resis-
tive and reactive characteristics of an antenna, find
its resonant frequency, or adjust it to a specific fre-
quency. (2.) You can use it to determine the resonant
frequency of a series- or parallel-tuned LC circuit,
or find the value of an unknown capacitor or induc-
tor. (3.) You can adjust a tuned feedline. or 1/4-wave
trap. (4.) And you can use your Bridge to preset an
antenna tuner, saving tune-up time. The information
in the following parts of the Operation section give
you detailed instructions for each of these uses.

NOTES:

0 To use your Antenna Noise Bridge, you will
need a shortwave receiver or amateur radio re-
ceiver that covers the frequencies of your an-
tennas. The receiver should receive AM or
wide-band SSB signals, and have a signal
meter. An AC voltmeter connected to the re-
ceiver speaker terminals can serve as a signal
meter if your receiver does not have one.

0 For the most accurate measurements, the un-
known antenna (or load) should be connected
to the UNKNOWN socket with the shortest pos-
sible length of coaxial cable. Otherwise, the
characteristics of the cable can mask those of
the antenna.

0 When antenna measurements are being made
close to the frequency of strong signals, the
Bridge null may be obscured. The elements of
the Bridge will react to the strong signal rather
than the characteristics of the antenna.

CAUTION: If you use a transceiver with your Noise
Bridge, DO NOT attempt to transmit with the Noise

Bridge connected. Damage to both units may result.

Heathkit°

ANTENNA MEASUREMENTS

Adjusting an Antenna

Refer to Pictorial 5-3 for the following steps.

1.

Connect the antenna to the UNKNOWN
socket.

Connect the receiver to the RECEIVER socket
and turn it on.

Tune the receiver to the expected resonant
frequency of the antenna and set it to receive
AM or wide-band SSB signals.

Set the Bridge RESISTANCE (R) control to the
impedance of your antenna feedline. (For
most coaxial cables this will be either 50 or
75 ohms.) Then set the REACTANCE (X) con-
trol to zero (0).

Turn the Bridge on. You should hear a tone
in the receiver speaker and see a signal meter
reading near SQ (half-scale).

Adjust the RESISTANCE (R) control for a null
on the signal meter (minimum meter reading).
Then adjust the REACTANCE (X) control for
a null.

Repeat the last step until you obtain the low-
est possible meter reading.

Note the RESISTANCE (R) and REACTANCE
(X) control readings. A perfectly tuned, or
matched antenna should indicate an R read-
ing of 50 to 75 ohms [representing the total
antenna impedance), and an X reading of zero
[0), indicating the antenna appears as a purely
resistive load.

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Refer to Pictorial 5-6 for the following steps.

1.

Connect the antenna tuner to the UNKNOWN
socket and the receiver or transceiver to the
RECEIVER socket;

Set the RESISTANCE control to 50 and the
REACTANCE control to zero (0).

Set the antenna tuner to the proper band, if
appropriate, or preset the tuner inductor as
directed in the tuner manual. The tuner
capacitors should be preset to the center of
their rotation.

Heathkit"

4. Tune the receiver to the desired operating fre-
quency. Then adjust the antenna tuner con-
trols for a null on the receiver meter, or a null
in the noise level from the speaker.

This places the tuner very close to the desired fre-
quency. A small readjustment of the tuner may be
necessary to peak the transmitter output.