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[TenTec] Frequency lockup OmniVI+

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Subject: [TenTec] Frequency lockup OmniVI+
From: aa8ve@juno.com (JEFF S JOHNSON)
Date: Mon, 4 Oct 1999 18:02:26 -0400
I don't know about the Omni-6 but on the Omni-5  I have done a master
reset a few times if it starts to lock up or have any problem.  To master
reset remove the backup battery and while power is off press in reset on
the side then hold in the clear button on the keypad. Then turn on the
power there should then be two beeps one low and another higher pitched
release the clear button and rig should be operating properly. Everything
will be at default and all memory lost. If it won't you may need a new
software chip. As long as the rig power is turned on at the rig, not from
the power supply the power up should not cause lockup as the internal
regulator board will be in play.  Maybe someone with an Omni-6 can help
73 Jeff,   aa8ve

On Mon, 04 Oct 1999 17:01:41 +0100 Piotr Tomczak <pito@nera.no> writes:
> Well Elmers I try again...
> I have problems with frequency lockup once a while while powering 
> the 
> omni VI+ up. (Still )
> There has been only few responses. 
> One case is sure, it helps to have the power supply on all time. (as
> suggested)
> Then the problem disappers.
> I checked the power supply (Drake PS7) Any way are there any of you 
> using
> old good PS7 from Drake to power your Omni ???
> The PS7 power supply is clean and very stable even with 25A load 
> (not on
> TenTec).
> Actually I see some oscilaltions while the voltage is powered on 
> and off but it is about max 3 v overshut and the oscilations varies 
> from
> 5 to 100nano secounds. Difficult to chatch it with Osciloscope.
> One should notice that the Omni's power switch is OFF and only the
> xtal owen is on.
> Any way I get that lockup from time to time ,if you like it or not.
> Does any bodyknow how the frequency is hold ? Is it stored in the 
> battery backuped RAM ???
> Has any body looked at the RESET circuit of the controll processor 
> for OMNI
> VI?
> There is only a capasitor and resistor. This combination gives us 
> about
> 10 - 20 mili sek REST pulse for the 80c32 processor. Normally it is 
> enough.
> The industry standard specs it to 150 mile Sek. 
> May be the processor gets alive too fast ???
> I decided to change over the RESET circuit with a monolitic reset
> circuit from Dallas, it gives a stable 150 mili Sec reset puls after 
> the
> voltage has
> stabilize itself. The chip look like a small transistor with only 3
> connections.
> (suits fine in the position of the existing network)
> Any sugestions ???  Need your help !!!
> Piotr LA9HFA
> --------------
>    \\\@///  
>      ·    · 
>        o      
> -------------
> Piotr Tomczak           Ham call: la9hfa
> Nera ASA                  Tel: +47 6724 3135    Fax: +47 6724 4445
> 1361 Billingstad         E-mail job:        pito@satcom.nera.no    
> Norway                      E-mail home:    la9hfa@qsl.net


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