Sangean: static zap protection

Sangean: static zap protection

Post by Chris Brewst » Sat, 29 Oct 1994 22:00:32

The following is, according to Joseph Feng, a standard solution to the
problem of static zapping coming through an antenna.  This is a
particular problem on Sangean sets.  I've added it to the FAQ that I've
been sending out.   Anyone is invited to write me to get this new
version of the FAQ (which has other improvements), or simply add this
posting to it.

Chris Brewster


Subject: Re: Almost got my DX-390 fixed, one last question....
Organization: IBM SSD, San Jose, California 95123 USA

Quote:>I have a question about the static-zapping problems that Sangean and
>Radio Shack models have: is there any way to modify the set to prevent
>the damage in the first place?

I would use the technique that is described for the Sony 2010:  put a
couple of paralleled back-to-back diodes between the antenna lead and
the circuit ground(usually the same as the negative battery terminal).
This method has a wide applicability beyond just RF front ends.

Suggested diodes are 1N914/1N4148, available almost anywhere including
Radio Shack.  The circuit can be found in the 2010 mods that get posted
occasionally:

    Antenna  ----------------------------------------------- Radio Antenna
                        |              |                       input
                        |              |
                        |              |
                      -----           \ /
                       / \           -----
                        |              |
                        |              |
                        |              |
    Ground   ----------------------------------------------- Radio ground
                                                        ( usually the power
                                                          bus connected to
                                                          the negative
                                                          battery terminal )

--

Chris Brewster                            Cray Research, Inc.

 
 
 

Sangean: static zap protection

Post by Chris Brewst » Sat, 29 Oct 1994 22:05:09


Joseph Feng adds the following points to my previous posting:

   - He doesn't guarantee that it works for Sangean radios, although the
     principle is well-known and it is reported to have worked with
     Sony 2010/2001D and other radios(and in other areas where it is
     important to minimize damage due to electrostatic discharge).

   - The information came from the 2010MODS file from ftp.funet.fi or
     oak.oakland.edu.

--

Chris Brewster                            Cray Research, Inc.