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From: "n...@no6b.com"
To: Repeater-Builder@yahoogroups.com
Sent: Sat, February 27, 2010 6:25:09 PM
Subject: Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current
requirement?
At 2/25/2010 12:36, you wrote:
>Build it yourself. Use an LM7808 and and series two 1N4001
At 2/25/2010 12:36, you wrote:
>Build it yourself. Use an LM7808 and and series two 1N4001's to lift the
>ground lead up by 1.4 volts. I know 7809's are around but the 7808 is much
>more common and cheaper.
One thing to watch out for in lifting the ground pin above ground on the
78xx series d
nd connecting the ground
lead to the tap. See:
http://www.national.com/ds/LM/LM340.pdf.
73,
Bob, WA9FBO
-Original Message-
From: Jeff DePolo
To: Repeater-Builder@yahoogroups.com
Sent: Sat, Feb 27, 2010 9:32 am
Subject: RE: [Repeater-Builder] Re: Micor UHF Repeater Base 9.
> In a station, the 9.6 volt circuitry *could* be run from 12 volts, as
> long as its regulated. I'm not suggesting someone does that, because
> the circuits were optimized for 9.6 volts, but I'm trying to
> make a point.
Point taken, but to add to your cautionary note, there are some circuits
DCFluX wrote:
> In that case Just a straight 7809 or 7810 also would not require
> isolating the tab and can be mounted straight to the metal chassis.
>
>> If it were me, I'd just use a 9 or 10 volt three terminal regulator
>> (7809 or 7810) and skip the whole LM-317 or diodes in the ground leg
>>
In that case Just a straight 7809 or 7810 also would not require
isolating the tab and can be mounted straight to the metal chassis.
> If it were me, I'd just use a 9 or 10 volt three terminal regulator
> (7809 or 7810) and skip the whole LM-317 or diodes in the ground leg
> deal. It only serves
DCFluX wrote:
> How about a 7809 regulator IC with a 1N4004 diode in the ground leg to
> raise the output voltage to 9.6V?
There is nothing mysterious about 9.6 volts. It could be 9.00 volts
10.00 volts 11.00 12.00 volts or *anything* in between. The part that
is critical is that it is stiffly
lder] Re: Micor UHF Repeater Base 9.6 vdc current
requirement?
How about a 7809 regulator IC with a 1N4004 diode in the ground leg to
raise the output voltage to 9.6V?
> I was envisioning mounting it to something metal for heatsinking purposes,
> but I guess you could probably use
Hey Skipp,
Have a look here... http://www.bcfmca.bc.ca/rptvhfmods.html
Cheers!
Lee
--- In Repeater-Builder@yahoogroups.com, "skipp025" wrote:
>
>
>
>
>
> > "Jeff DePolo" wrote:
> > Mo's spec for the 9.6V supply is +/- 0.3V on station
> > power supplies and +/- 0.5V for the regulator i
How about a 7809 regulator IC with a 1N4004 diode in the ground leg to
raise the output voltage to 9.6V?
> I was envisioning mounting it to something metal for heatsinking purposes,
> but I guess you could probably use one of the screws on the backplane plus a
> little TO220 heat sink. Whatever
> The diagram for the adapter box also shows +13 Vdc is also routed
> to one of the pins in the same plug (as well as ground) so I have
> to figure out if that's a requirement or just an addition to the
> adapter package. I did see where +13 Vdc was supplied to another
> location on the repeate
> "Jeff DePolo" wrote:
> Mo's spec for the 9.6V supply is +/- 0.3V on station
> power supplies and +/- 0.5V for the regulator in Micor
> mobiles if I remember right.
Looks good... I actually found the manual to the external power
supply adapter I saw at a repeater site. Looks like the 9.
Hey Skipp,
I've just removed the AC supply from a SpectraTac receiver
shelf. Has a Micor RX & a couple of cards. System draws
less than 200ma.
I used an LM317 (a couple of caps & R's)... soldered the tab
directly to a piece of PCB material. Runs all day long with
12 input & doesn't even get wa
y 25, 2010 9:58:50 AM
Subject: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current
requirement?
"A'tank u viry much"
Less than 1 Amp is the good news...
Now instead of building a 3 terminal LM-317 regulator circuit
do we want to instead buy a pre-made complete regu
"A'tank u viry much"
Less than 1 Amp is the good news...
Now instead of building a 3 terminal LM-317 regulator circuit
do we want to instead buy a pre-made complete regulator board
off Ebay for about $7 and shipping?
A main switcher power supply or off a site DC source and the
electric bill
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