Mobile One Receiving Antennas

AM/FM Radio, DAB+ Radio, Digital TV & Scanner Antennas

Mobile One ARE the designer of the original AM/FM Car Radio Antennas.
Designed and Manufactured in Australia.

 

The art of making a great AM/FM antenna.

Mobile One makes AM/FM antennas for Cars,Trains, Boats, Caravans & Buildings.

1. The most important aspect of any low frequency antenna is the antenna impedance, Car radios have an antenna impedance of 75 to 100 Ohms which make it easy to use external antennas, Desktop radios and Hi Fi sound systems (Panasonic, Kenwood, etc) have a 300 Ohm or higher AM antenna input impedance or they may use an internal ferrite core antenna and have no simple way of including an external antenna.
Note: Kenwood and Panasonic desktop brand Hi Fi systems or radios are notorious for having high impedance antennas which make it impossible to have external antennas, these type of radios usually come with a twisted wire external antenna in the shape of a small square using plastic covered twisted wire. You cannot easily improve the reception without the use of a balun.

2. The next most important aspect is the antenna feed line or cable cable capacitance, It is important that when including an external antenna you use Low Capacitance coax such as RG62, Do NOT use CB coax RG58 as this will attenuate the AM signal, It will not however, attenuate your FM signal.

If impedance and capacitance are not right then the AM signal will be greatly reduced

IN A NUTSHELL - A $25 old second hand AM/FM car radio bought at a trash & treasure can out perform a $500 indoor desktop stereo system radio & cd player on AM anytime.

The Longer The Antenna The Better The Performance

Look at where you plan to put the antenna then measure the maximum length you can use, then get the longest antenna that will match your requirements, by far the best antenna is the M2W for FM and the M1W for AM

Cable Lengths Are Not Critical

Unlike UHF CB antennas, the length of cable is not critical but should still remain as short as required, excess cable should never be coiled.

There Are Different Types Of Coatings For AM/FM Antennas

                         PVC - A  thick coat of PVC plastic and is suitable for most applications, available in Black or White
                         Polyolefin - A  thick coat of Polyolefin rubber, for high quality & very long lasting finish, available in all colours.


Some Do's & Don't with AM/FM Antennas

 

DO - Test for shorts or open circuit if possible with an multi meter
DO -
Mount the antenna high as possible - This can improve the signal and reduce any background noise.
DO -
Use a spring even if mounted on a bull bar to absorb vibration from the engine
DO - Use a wire strap to earth the base if necessary - but make sure it is secured
DON'T - Mount the antenna close along side any metal object or antenna

 

The Main Causes For Poor Performance With AM/FM Antennas

Poor ground plane, Antenna too short, Antenna too low, Antenna to close to another.


Scanner Antennas

Mobile One designer of the original SCATX antenna

 

There are two kinds of scanner antennas

The Discone

1. The discone is a wide band receiving antenna that can work on an enormous bandwith, allowing you to scan 25MHz to 1.3gHz continuously with equal performance, this is ok for general listening but the drawback is that there is no gain on any frequency or band. Mobile One makes an antenna that is similar to a discone in theory the "SCBASE"

The Resonant Antenna

2. The other antenna is a standard transmitting type of antenna that has been designed for particular frequency and or bands, this antenna does not work equally well throughout 25MHz to 1.3gHz but has highs and lows of performance throughout 25MHz to 1.3gHz, this allows the antenna to have gain on various bands, Mobile One makes such an antenna called a SCATX, this name implies the antenna is a combined scanning and transmitting antenna.

In most cases the SCATX will outperform the SCBASE depending on the frequency required and the application set.

 


Digital Radio & TV Antennas

Be careful there are many types of radios and some do not accept external antennas

 

There are two kinds of Digital Radio & TV antennas

Some digital radios and TV's that are currently available, can have either a F Connector (Large Push In type) or a standard TV Type plug these digital radios and TV's may require a 75 Ohm Antenna, however, there are other smaller DAB+ Radios that require a tiny screw in connector called a SMA connector , these require a 50 Ohm Antenna.

 

As always if in doubt shout - Call Peter on 02-46556677