Aiming your speaker box - Eddie Runner
 

Diversity Antennas - by Eddie Runner

I got a phone call the other day and the customer had questions about his Nissan diversity antenna system.

A diversity or sometimes called a dual diversity antenna system came on the scene in the mid 80s. 
Sony made an aftermarket car stereo that you could plug two car antenna into.
The purpose was to eliminate the multipath noises common on mobile (moving) FM reception, sometimes called picket fencing

In the 80s where aftermarket car stereo was really dabbling in HIGH END, some of the FM receivers were so sensitive that they had HUGE problems with multipath. As an installer,  I would often take out the crappy old factory stereo and install a state of the art Alpine, Concord, Soundstream, Proton or other good stereo and the customer would return with reception problems that they did not have with the old factory stereo.. FLUTTER...    Caused by the FM signals being blocked and bounced by buildings in the city.

Trying to get rid of this problem without desensitizing the tuner or cutting off high frequencies (like the factory stereos) they came up with the diversity idea.
The diversity radio had the ability to sample both antenna inputs and automatically switch to the antenna that had the best signal..  

A few factory car stereos such as some Nissans also made some diversity tuners, these cars have two antennas ..

At this time I am not aware of any aftermarket car stereo that uses two antennas..  So the customers question was, How do I hook in the two antennas to a radio with only one antenna port?

Now they do make an adapter for the dual antennas, but my solution when I was installing and before they made the current adapters was to simply use ONE of the antennas from the car.   The aftermarket stereo has only one input so it cannot possibly SAMPLE two antennas and choose the best one like the original diversity radios were said to do. So why would you even need two antennas in a normal stereo?   I don't think you do.  Just pick one and give it a try, or pick the other one and see if you like it better, or buy the adapter available now and try both at once (not truly diversity, just two antennas) and see if you think the receptions is better or worse.

 

       

 

River Oaks Car Stereo
Tech Resources
History 101
Car Warranties
Installer Mailing List
Fiber Optic AUX Input
 
Setting Amplifier Gain
Aiming Woofer Box
Cone Area
Ohms Law Chart
Transfer Function
Pre-Amp Voltage
Diversity Antennas
Woofer Box Size
Frequencies and Wavelengths
Frequency Spectrum
Speaker Resonance
Head Unit Power
Audio Imaging
Audio Loudness Control
FM Multipath
Watts
RCA cs Cat5
Crossovers
Woofer Box Perfection
Tight Bass
Speaker Impedance
Speaker Specs
Test Equipment
 
Good Sound
Poor Car Stereo
Phonetic Alphabet
River Oaks Car Stereo Newspaper
Woofer Box Strength
CB Radio
Fuses
Giant Loudspeakers
Amateur Radio
Amateur Radio Installations
Head Rest Video
Test
Tool List
Proper Grounding
Radio Spectrum
Short Wave Radio
Perfect Installer
Trunk Rattles

WE SHIP DIRECTLY TO YOU
713-626-7627 or 713-626-7628

If you have any questions or problems feel free to contact us for help or directions.
We are located at 4129 Richmond Ave. Houston TX 77027

Database and this Website Copyright © 1995-2023 Eddie Runner - Installer.com Websites Hosted by TXSoft
This Donaim is for sale - Owner wants to retire - been online since 1995