Aerial (Antenna) Connection - AOR AR2700 Operating Manual

Important!
Do not overcharge the NiCad pack, 16 hours is
sufficient from flat. In severe cases of overcharging
high temperatures may be generated, this can result
in damage to the NiCads and to the receiver. If this
point is ignored, there is a small but potential danger
of personal injury due to explosion. Never short
circuit NiCad batteries, the effect is similar to
overcharging but happens very quickly. Never
attempt to charge dry batteries.
4-5 Aerial (antenna) connection summary
The aerial input is via a high quality BNC 50 OHM
socket. The standard supplied telescopic whip
should provide good result across most of the
receiver's frequency coverage with the exception of short wave & medium/long
wave.
The BNC socket should also permit straight forward connection to almost any
type of receive aerial setup.
It is not possible to further increase sensitivity on medium wave, firstly due to
the up-conversion receive circuit employed (which is required for high quality
VHF-UHF reception) and secondly due to the potential noise from the
microprocessor (being a compact hand-held design).
Aerial attenuator
An aerial attenuator system allows selection of 0dB or 10dB. This is especially
useful in reducing the potential for breakthrough when using external aerial
systems.
Do remember, if considering the use of an external aerial, there will be a
greater chance of signal overload and breakthrough. While this will not
damage the receiver in average use, it may degrade the receive performance
due to the effects of "signal mixing". Liberal use of the attenuator may be
required.
VHF - UHF discone aerials
Ideally, separate aerials should be employed for each frequency or band of
interest. Of course, except for government listening stations this is totally
impractical. For this reason most people choose an externally mounted
discone aerial such as the AOR DA3000 aerial. The DA3000 has a usable
frequency coverage of 25 to 2000 MHz.