[TenTec] Fw: Problem with Paragon I

Robert & Linda McGraw K4TAX RMcGraw at Blomand.Net
Sat Aug 27 08:15:10 EDT 2005

Tried sending this direct to Vic at his address but it was rejected by the 
server.  Hope he sees this.  Thanks for the bandwidth on the reflector.

Bob, K4TAX

----- Original Message ----- 
From: "Robert & Linda McGraw (K4TAX)" <RMcGraw at Blomand.Net>
To: <zrdc28 at hiwaay.net>
Sent: Saturday, August 27, 2005 6:54 AM
Subject: Re: [TenTec] Problem with Paragon I

> Vic:
> I've seen your post and several of the responses.  Before you start 
> digging into the radio let me ask a few questions to clarify some points.
> From my memory of your problem, it appears that the microprocessor 
> initialization from ROM is not being done correctly.    MP's do require 
> that the Vcc come up to correct value and stabilize before running the 
> initialization code.  The process is controlled by the RESET pin and the 
> external to the MP the RC components.  Usually if the C value decreases 
> with age, typical of electrolytic caps, then the initialization is too 
> fast thus scrambled data is loaded from RAM .  I'll look at the schematic, 
> but at present it is at my shop and I'm here at the house.
> Here's the questions:  No battery installed in all cases.
> 1. With the PS and radio off, turn the radio on then turn the power supply 
> on in that order.  What happens?
> 2.  With the PS off and the radio on, turn the power supply on.  What 
> happens?
> 3.  With the PS on and the radio off, turn the radio on.  What happens?
> I think you may have stated these in your post but I no longer have it. 
> These answers will better allow me to assist you with your problem.
> 73
> Bob, K4TAX

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