Finch
Sent: Tuesday, March 25, 2008 10:05 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] 24 vdc to 12vdc
Hello Group,
I will say right now, a resistor is a bad idea but it can work of done
correctly and the load is a constant. Back before I knew better I did just
that. I
Three here.
Chuck
WB2EDV
- Original Message -
From: "Paul Finch" <[EMAIL PROTECTED]>
To:
Sent: Tuesday, March 25, 2008 12:17 PM
Subject: RE: [Repeater-Builder] 24 vdc to 12vdc
> Did everyone get this email three time like I did? I only sent it once.
> Sorry
Subject: RE: [Repeater-Builder] 24 vdc to 12vdc
Hello Group,
I will say right now, a resistor is a bad idea but it can work of done
correctly and the load is a constant. Back before I knew better I did just
that. I needed 12 VDC for the filament of a GE Mastr Pro UHF transmitter, I
can't rem
Sent: Tuesday, March 25, 2008 7:34 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] 24 vdc to 12vdc
Rick,
Definitely do not use a resistor. Its drop depends on current draw and if
the rig is a transceiver it will draw much more current on TX than RX
changing the drop.
You can
Sent: Tuesday, March 25, 2008 7:34 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] 24 vdc to 12vdc
Rick,
Definitely do not use a resistor. Its drop depends on current draw and if
the rig is a transceiver it will draw much more current on TX than RX
changing the drop.
You can
Sent: Tuesday, March 25, 2008 7:34 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] 24 vdc to 12vdc
Rick,
Definitely do not use a resistor. Its drop depends on current draw and if
the rig is a transceiver it will draw much more current on TX than RX
changing the drop.
You can
Some of the earlier equipment with 24 volt power and tube radios did use
a big ballast resistor. It did put out some heat. There was not that
much difference in current draw between send and receive, so you might
have 14 volts on receive and drop to 11 or so on send - with solid state
the cur
Page 57 of the latest AES catalog... Astron H2412-12, 28VDC to 13.8 VDC @
10A - $59.99. Or H2412-24, rated at 20A - $89.99.
http://www.aesham.com/pdf/page56-61.pdf
Mark - N9WYS
-Original Message-
From: Repeater-Builder@yahoogroups.com On Behalf Of kf0m
Astron makes a unit that will co
-to-12 V converter.
73, ron, n9ee/r
>From: Rick & Charlotte <[EMAIL PROTECTED]>
>Date: 2008/03/24 Mon PM 02:21:31 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] 24 vdc to 12vdc
>
>I hope some one on the group can help me
A word of caution about "cheating"... You want your installation idiot
proof and therefore use the 24-12 inverter from Astron and save yourself
some grief down the road. I've seen many a blown reverse protection
diode from just the same installation. You can't go wrong with the
inverter. Als
Lock
kf0m at arrl.net
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] Behalf Of Rick & Charlotte
> Sent: Monday, March 24, 2008 2:22 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] 24 vdc to 12vdc
>
&g
without
anything extra for most situations
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Steve Kometz
Sent: Monday, March 24, 2008 1:44 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] 24 vdc to 12vdc
You can "cheat" a
This is a very common issue in aircraft. The most obvious question is
does your jeep use 2 each 12 volt batteries? If so, simply connect
your radio across one of 'em.
If this can't be done for one reason or another, something along this
line is another solution:
http://www.powerstream.com/dc
You can "cheat" and run off one of the 12 v batteries.
But the better way is to use something like the Astron 2412 DC to DC
converters.
I used several of them in the past running 12 v radios in 24 v helicopters.
Like a lot of Astron stuff, they worked very well.
I think the 9 amp version s
Yes, there are devices to drop the voltage. Astron makes some.
There are also ones that will give you positive 13V from a negative 13V
system. (old Mack trucks, for example)
Joe M.
Rick & Charlotte wrote:
> I hope some one on the group can help me out here
>
> I want to put a radio in a jeep
I hope some one on the group can help me out here
I want to put a radio in a jeep
the problem is the jeep runs 24 v and as you know radios run 12v
Is there a device that will drop 24v down to 12 vdv ? I know I could use a
droping resistor but I can see it making a lot of heat
if I remember
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