[Premium-Rx] R3030A

[Carcia, Frank A. HS]

Hi John,
There could be an issue with the EEPROMS getting an extra write as power
goes down.
This could be due to a VCC hold up cap changing value. I forgot this radio
had a squelch so in a panic did the spook house cleaning.
Still this is better than a battery leaking its guts. I found Cubic used the
same epoxy caps Racal did and have seen them go bad in both receivers. fc

-----Original Message-----
From: refmon [mailto:monitor at referencevideo.com]
Sent: Wednesday, May 12, 2004 5:35 PM
To: Premium-Rx (E-mail)
Subject: Re: [Premium-Rx] R3030A


Hi Frank & Group,

I expect you experienced what one might call a "disorderly shutdown".  Your
yank of the cord was, I suppose, a form of power failure.  Probably what
happened was a "level" (squelch) value was set.  In manual RF/IF gain mode,
the threshold is easily bypassed with knob with gain adjustments.  Clearing
the memory was your best move, as you don't know what else may have been set
in any of the 100 memory channels.

Note the 3030 usually can sense power falling off and performs an orderly
shutdown.

I have another species of surprise with the 3030 series:  The receiver can
shut itself down (that is the power supply) when it is spiked or gets
hot...it's normal for the receiver to be pretty warm....on a hot day, it's
not too hard to get the heat shutdown to trip.  There is no indication that
this has happened...usually, by the time I've noticed the receiver went
dead, regained my composure, and start troubleshooting, the receiver has
cooled down.  Solution is to remove power for a minute or two and repower.
It seems that removal of power is required, as I have shut off the receivers
and never got a reset until power down.

Another intermittent issue:  display filickers or varies in intensity for no
visible reason.  There is a flexible plastic ribbon connection between the
front panel display and the piggy-backed electronics...this may either be
misseated or need cleaning...as always, DeOxit nails the problem without
undue effort.

regards

John Collins
_____________________________________________

----- Original Message ----- 
From: "Carcia, Frank A. HS" <francis.carcia at hs.utc.com>
To: "Premium-Rx (E-mail)" <premium-rx at ml.skirrow.org>
Sent: Monday, May 10, 2004 9:17 AM
Subject: [Premium-Rx] R3030A


> Hi All,
> When I go away for a few days I unplug things in the shack to avoid
> problems. I yanked the plug from the 3030A while it was turned on. I
> returned from my trip and turned the radio on to find there was no audio.
I
> went through the menu and found nothing strange but could get audio in
> manual AGC mode. I remembered reading in the manual that memory could be
> cleared by pressing RCL- 9- 1- 1- ENT. I gave it a try and everything was
> back to normal.
> Something must have been stored as the radio went down.
>
> My LT5506 EVAL board arrived and I powered up last night. This will make a
> great interface between the 40.455 IF and
> the computer for my SDR project. I just need to set up an agc loop and 2X
LO
> for the board. I prefer up conversion to a
> narrow IF before converting to base band I/Q. Very well built board.    fc
>
>
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