AOR AR8200 Spezifikationen PDF herunterladen (Seite 140)

140

Propagation

VHF and UHF transmissions generally only propagate relatively short distances when compared to short wave signals. For all

intents and purposes they may be considered as line-of-sight plus a bit.

Where as point to point communication between mobile users or when in built up areas may only be a couple of kilometres, aircraft

at heights of 30,000 feet may be heard for many tens of kilometres (100 to 300 with the right conditions).

Unlike VHF and UHF transmissions which generally propagate only on a localised basis (to the horizon plus a small amount), short

wave transmissions may travel for many thousands of kilometres. Depending upon the frequency in use, time of day, season of the

year and sun spot activity, transmissions may propagate completely around the World.

Luckily the frequency spectrum of short wave is often reflected back down to Earth by the upper layer of the Earth’s atmosphere

called the ionosphere. When the reflected signals reach the Earth again they may either be received or reflected back up into

space. If lucky, they will be reflected by the ionosphere yet again down toward the Earth providing reception into another and

possibly more distant location. Depending upon the time of day and desired skip distance, different frequencies will be selected by

Radio Amateurs and commercial users such as Oceanic Air Traffic.

(22) Specification

Frequency Range: 500 kHz to 2040 MHz

(Actual frequency input 100 kHz to 2040 MHz,

performance between 100 kHz to 530 kHz is

not guaranteed).

Receive Modes: WFM, NFM, SFM, WAM, AM, NAM, USB, LSB, CW

Sensitivity:

500 kHz ~ 2.0 MHz

AM: 3.50 µV (10dB S/N)

2.0 MHz ~ 30 MHz

SSB: 1.50 µV (10dB S/N)

AM: 2.50 µV (10dB S/N)

30 MHz ~ 470 MHz

SSB: 0.30 µV (10dB S/N)

AM: 0.70 µV (10dB S/N)

NFM: 0.35 µV (12dB SINAD)

WFM: 1.00 µV (12dB SINAD)

470 MHz ~ 1 GHz

NFM: 0.50 µV (12dB SINAD)

WFM: 1.50 µV (12dB SINAD)

1.0 GHz ~ 1.3 GHz

NFM: 1.00 µV (12dB SINAD)

1.3 GHz ~ 2.039 GHz

NFM: 2.50 µV (12dB SINAD)

Selectivity: SSB/NAM 3kHz (-6dB), 9kHz (-60dB)

AM/SFM 9kHz (-6dB), 20kHz (-40dB)

WAM/NFM 12kHz (-6dB), 25kHz (-40dB)

WFM 150kHz (-3dB), 380kHz (-20dB)

Power Consumption: 190mA (nominal), 145mA (stand by), 25mA (power save).

4 x AA internal cells

or 12V d.c. external supply

Dimensions: 61(W) x 143(H) x 39(D) mm

Weight: 196g (335g including NiCads)

Memory channels: 1,000 (20 banks)

Select scan channels: 50

Priority channels: 1

Section 22

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