[ICOM] Delayed Start-up Circuit

[Davies, Doug A FOR:EX]

This question is a result of the recent problem I had with my IC-02AT.
Although I can't confirm it, my suspicion is that the cause of the squeal
problem with the handheld may be attributable to how I had it hooked up in
the vehicle.  I had the rig powered via the external DC input jack on the
top.  This was plugged into one of the power points.  These are not "hot"
unless the vehicle is either running or the key is in the accessory
position.  The result is, when the car is fired up, the radio goes on for an
instant then as the engine is turning over and drawing power the radio goes
off due to lack of sufficient voltage.  Once the engine is running the radio
then goes back on.  I am thinking that this on-off-on cycle is not good for
the rig.

I have a good idea of how to correct this but lack the technical knowledge
to pull it off.  I would like to build a circuit that would include a
delayed start-up function.  I want it to only send the 13.8 volts to the
radio after say, five seconds after the key is turned on.  This will
eliminate the cyclic thing and only allow the radio to go on once the
voltage has stabilized.  

I would really appreciate it if those in the know about such things could
provide me with some ideas on how to construct such a circuit.

Doug  VA7DD

Doug Davies
Tenures/WoodlotForester
Kalum Forest District
Terrace, B.C.
250)-638-5125 
(250)-638-5176 Fax
MailTo:Doug.Davies at gems3.gov.bc.ca