I could be mistaken, but another reason why it would be easier to just 
replace the caps is that I think you will then have to find and disable the 
emergency power alert tone if you go direct to 12v. Unless you completely 
remove the supply that is.....

Adam N2ACF

----- Original Message ----- 
From: "Bob M." <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Monday, January 16, 2006 07:48
Subject: Re: [inbox] [Repeater-Builder] SpectraTac receiver on 12v


>I was about to say the same thing. Easier to fix it
> than to bypass it.
>
> Unplug the power to the unit. Unplug the cables going
> to the cardcage backplane so you can get the back
> cover off. The back cover is held on with four screws.
> There should be two screw terminals on standoffs
> coming off the power supply board; these are the 12V
> battery backup terminals. They're very close to the
> voltage adjusting pot on the board.
>
> The station should work just as well on battery as on
> AC. It would be better to replace the bad caps.
> However, you probably won't find exact replacements
> available any more, especially for a big aluminum can
> capacitor.
>
> I have a full manual on the SpectraTAC receiver. I
> could send you the schematic, board layout, and parts
> list if that would help. I can either scan them and
> put them up somewhere, or make copies and mail them to
> you.
>
> Bob M.
> ======
> --- Ellen Engle <[EMAIL PROTECTED]> wrote:
>
>> Take the back cover off of the unit and find the AC
>> supply.  Take a look at
>> the electrolytic caps and jump them out and yuo will
>> quickly find your hum
>> problem.  Yes the radio can be run on 12 v, but
>> it'sjust as easy to do basic
>> troubleshooting with a DVM and find the noise.
>>
>> Milt
>> N3LTQ
>>
>>
>> ----- Original Message ----- 
>> From: "Steven Passmore, kf6fkk"
>> <[EMAIL PROTECTED]>
>> To: <Repeater-Builder@yahoogroups.com>
>> Sent: Monday, January 16, 2006 12:21 AM
>> Subject: [inbox] [Repeater-Builder] SpectraTac
>> receiver on 12v
>>
>>
>> > Is it possible to operate SpectraTac receivers on
>> 12v easily? I don't have
>> a
>> > manual for the unit so I'm unsure what the
>> specific connections are for.
>> The
>> > two VHF units I have exibit a slight 60Hz hum in
>> the audio. I'd like to
>> try
>> > running them on 12v to isolate the built in supply
>> as the problem.
>> >
>> > Thanks
>> > Steve
>
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