[arm-allstar] RX Audio only heard when Flashing Red LED is in ON State

Mon Jul 13 06:18:18 EDT 2020

Well sir, I'm glad you found your issue. Over voltage can do strange things to devices. I'd like to know your solution. Great news. Again, good luck.

Lou, W2LPC
Node # 51284

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From: ARM-allstar <arm-allstar-bounces at hamvoip.org> on behalf of "David McGough via ARM-allstar" <arm-allstar at hamvoip.org>
Sent: Monday, July 13, 2020 1:31:33 AM
To: "Joshua Hatton via ARM-allstar" <arm-allstar at hamvoip.org>
Cc: David McGough <kb4fxc at inttek.net>
Subject: Re: [arm-allstar] RX Audio only heard when Flashing Red LED is in ON State

Whoa! If you've got 9V on the 5V bus, you'll be very very lucky if that
controller isn't toast!  Even if it continues to work for now, there may
be damage that'll show up later, at an inconvenient time.

I guess the regulator in question is a 7805 family linear regulator?
Those chips are incredibly reliable. My next question is: why did it fail?

73, David KB4FXC

On Mon, 13 Jul 2020, "Joshua Hatton via ARM-allstar" wrote:

> Lou, you just may be onto something, sir.

5V Regulator is measuring 8.94VDC out... 13.8VDC In, obviously.......
I'll be d...ang.  Well, sir, you're owed a beer.  Sometimes it's not
at all what you expect.  The regulator is the LAST thing I'd expect.
I wouldn't have the time to look up each and every chip and IC in the
unit, but obviously nearly 9Vcc is not a "problem" operation-wise for
the CPU.

(Not excusing the high Vcc, only talking through the issue)

The Darlington transistor IC that takes in the COR will handle up to
30Vcc Input and 50V output....However, the next component in the COR
line is an EEPROM chip...it only wants Vcc of 5VDC at +/5%...
(hello!!)........ Next is the 8-bit CMOS, and I believe it's Vcc is
the actual supply voltage.  I would say that there is definitely
instability due to the near 9V across the board rather than 5V.

I think I will order regulators!  Thank you sir

On Sun, Jul 12, 2020 at 3:21 PM "Louis Corradi via ARM-allstar"
<arm-allstar at hamvoip.org> wrote:
>
> Lou, W2LPC here, just wanting to put in my 2Â¢. It sounds to me like you may have either an over voltage/transient or your COR voltage in your controller is not stable. Just a thought. Have you checked ALL your grounds, Pi pwr sup? Good luck, hope you find your bug.
>
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> CONFIDENTIALITY NOTICE: This email and attached files (if applicable) is a privileged and confidential work product and subject to legal restrictions and penalties regarding its unauthorized disclosure or other use. It is intended solely for the use of the individual or entity to whom they are addressed and may contain information that is confidential, privileged, protected by law or exempt from disclosure under applicable law. If you are not the named addressee or intended recipient, you are hereby notified that any dissemination, distribution or copying of any part of this communication is strictly prohibited. Please notify the sender immediately by email if you have received this email in error and delete all copies of this email from your systems message server.
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> From: ARM-allstar <arm-allstar-bounces at hamvoip.org> on behalf of "David McGough via ARM-allstar" <arm-allstar at hamvoip.org>
> Sent: Sunday, July 12, 2020 4:00:53 PM
> To: "Joshua Hatton via ARM-allstar" <arm-allstar at hamvoip.org>
> Cc: David McGough <kb4fxc at inttek.net>
> Subject: Re: [arm-allstar] RX Audio only heard when Flashing Red LED is in ON State
>
>
> Does the RED TX LED behave normally (meaning "on" all the time when TX is
> asserted, "off" when TX not asserted), when unplugged from the controller?
>
> If is does, I expect the CAT250 has an issue with its COR pin not
> "floating" high and requiring active pull-down to enable.
>
>
> 73, David KB4FXC
>
>
>
> On Sun, 12 Jul 2020, "Joshua Hatton via ARM-allstar" wrote:
>
> > I am attempting to interface a Pi w/ Allstar to a CAT250 Controller.
> > I am running into an issue I've never experienced before.
> >
> > I appear to have success, in the aspect of "operation"... I am able to
> > send commands to HamVoIP over the controller audio, and able to hear
> > them, however, the audio received from the Pi/USB Interface is only
> > heard when the Flashing Red LED of the Interface is in the ON state
> > (It's not a steady light).  Very odd. There is a measured voltage on
> > that line as well, as the Red LED maintains a slight dim glow.
> > Thinking something was wrong with my Masters Comm. RA35 Interface, I
> > dug out an old URI Interface... It's doing the same thing exactly.
> > Something is definitely circumstantial with the controller.  Perhaps I
> > need to do a Pull-up/Pull-Down on **both** the PTT and COR Lines under
> > the circumstances?
> > That is pulling one to Pi USB Voltage and the other to controller PSU
> > voltage?  Just thinking out loud on that.  Wiring made as written
> > below.
> >
> > Pi USB Int.  < ---- >  CAT250 Link Port
> > ---------------------------------------------------------------
> >      PTT   < ---------------- >   COR
> >      COR  < ---------------- >   PTT
> >      RXA   < ----------------- >  TXA
> >      TXA   < ----------------- >  RXA
> >      GND  < ----------------- >  GND
> >
> > THanks for any guidance.
> > Josh W4ZZK
> > _______________________________________________
> >
> > ARM-allstar mailing list
> > ARM-allstar at hamvoip.org
> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> >
> > Visit the BBB and RPi2/3/4 web page - http://hamvoip.org
> >
>
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