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Old September 24th 03, 02:28 AM
RHF
 
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Mike,

Having some form of Antenna Input Protection is a Good Idea.
- - - Instead of a Single Diode: *--|--@
* = Ground -and- @ = Antenna


# 1. Good - Try a two sets of Double Diodes.
*--|--|--@
*--|--|--@


# 2. Better - Use a Gas Discharge Tube (GDT) for EMF shunting and a
10K Ohm Resister for Static Electricity Bleed-Off to Prevent Static
Electricity Build-Up and Discharge.

*----(o----@
*--\/\/\/--@

# 3. "Best" is an Improvement to #2 would be to replace the 10K Ohm
Resister with a with a 10K Audio Taper Potentiometer.
+ One Leg/End goes to the Antenna.
+ The 'other' Leg/End goes to Ground.
+ Then the Center of the POT goes to the Radio.
+ The Radio's Ground is also connected to the common Ground.
NOTE: The 10K POT now acts as a Bleed Resister and also an External
RF signal Attenuator.

*----(o----@
*--\/\/\/--@
*====^=====@
*====|
*====R

R = Radio

iane ~ RHF
..
..
= = = mike
= = = wrote in message . ..

Sony 7600GR portable

I figured out the image problem. I think it's the voltage limiting
diodes I place yesterday across my antenna input to ground.

mike



 
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