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Old 11th Apr 2008, 4:55 pm   #7
radiola49
Diode
 
Join Date: Mar 2008
Location: Central Goldfields Shire, Victoria, Australia
Posts: 4
Default Re: Effect of using lower resistance Volume Control?

------"the coupling to the antenna is critical and that the antenna only works properly when it is attached (and grounded) to the car body. On the bench these conditions were not met and so it appeared that the gain of the set was (very) low,"------
The grounding for the antenna is achieved by an "artificial ground plane".
On Australian Army Landrovers (in the 1970's) that were equiped with two -way radio, two thin wooden battens were tied to the canvas canopy, these being attached to a sheet of metal (aluminium) about 3 feet square, in the centre of which was mounted the antenna.
So if you want to bench test a car radio, just mount a spare antenna into a spare car panel or a sheet of zinc-alum, steel, aluminium whatever is laying about.
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