Calling N8KDV

Calling N8KDV

Post by Maximu » Mon, 05 Jan 2004 07:18:43

Hi.
As a ham radio man, I am hoping you can help me out. I have a DX394 receiver
and usually use ac to power it. I can run from a car battery, with the
adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can
build an emergency power supply so I can listen using batteries when the
trees take out the power lines <s>.

What I thought I could do is get a 9v lantern battery and add two 1.5 volt D
Cells . I am not mathematically inclined in the least. If I connect the
positive of the lantern and the negative of the lantern to the corresponding
terminals of the two D Cells, and connect all that to the adaptor plug for
the back of the receiver, will it supply sufficient current to run properly
or not ? I could probably get an actual car battery, but would rather not
have that in the apartment.

V Solidarity

 
 
 

Calling N8KDV

Post by Soames1 » Mon, 05 Jan 2004 07:26:13


You can get a whole slew of extra Batteries to run your radio;
OR a solar Cell  ( Either Edmund Scientific or C Crane sells them)
OR a 12 Volt motorcycle battery...

Or a house type emergency Generator..

Hope this helps..
Harvey

>Subject: Calling N8KDV

>Date: 1/3/2004 5:18 PM Eastern Standard Time

>Hi.
>As a ham radio man, I am hoping you can help me out. I have a DX394 receiver
>and usually use ac to power it. I can run from a car battery, with the
>adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can
>build an emergency power supply so I can listen using batteries when the
>trees take out the power lines .

>What I thought I could do is get a 9v lantern battery and add two 1.5 volt D
>Cells . I am not mathematically inclined in the least. If I connect the
>positive of the lantern and the negative of the lantern to the corresponding
>terminals of the two D Cells, and connect all that to the adaptor plug for
>the back of the receiver, will it supply sufficient current to run properly
>or not ? I could probably get an actual car battery, but would rather not
>have that in the apartment.

>V Solidarity

 
 
 

Calling N8KDV

Post by N8KD » Mon, 05 Jan 2004 07:29:18


> Hi.
> As a ham radio man, I am hoping you can help me out. I have a DX394 receiver
> and usually use ac to power it. I can run from a car battery, with the
> adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can
> build an emergency power supply so I can listen using batteries when the
> trees take out the power lines <s>.

> What I thought I could do is get a 9v lantern battery and add two 1.5 volt D
> Cells . I am not mathematically inclined in the least. If I connect the
> positive of the lantern and the negative of the lantern to the corresponding
> terminals of the two D Cells, and connect all that to the adaptor plug for
> the back of the receiver, will it supply sufficient current to run properly
> or not ? I could probably get an actual car battery, but would rather not
> have that in the apartment.

> V Solidarity

What you'd probably rather get is a 12 volt gel cell and a trickle charger.

Steve
Holland, MI

 
 
 

Calling N8KDV

Post by Freddi » Mon, 05 Jan 2004 07:46:24

Hey V...go down to Battery World or something close, perhaps a local auto
parts store...and buy yourself a 14Ahr sealed lead acid battery (gel cell)
and a charger for it.

I run most of my stuff off this type of battery.

No hydrogen build up either.

Quote:> Hi.
> As a ham radio man, I am hoping you can help me out. I have a DX394
receiver
> and usually use ac to power it. I can run from a car battery, with the
> adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can
> build an emergency power supply so I can listen using batteries when the
> trees take out the power lines <s>.

> What I thought I could do is get a 9v lantern battery and add two 1.5 volt
D
> Cells . I am not mathematically inclined in the least. If I connect the
> positive of the lantern and the negative of the lantern to the
corresponding
> terminals of the two D Cells, and connect all that to the adaptor plug for
> the back of the receiver, will it supply sufficient current to run
properly
> or not ? I could probably get an actual car battery, but would rather not
> have that in the apartment.

> V Solidarity

 
 
 

Calling N8KDV

Post by Maximu » Mon, 05 Jan 2004 11:32:09

Thanks everyone !  But about the current, how much current is a gel cell
going to provide ? My concern was burnin gup the radio because the battery
would produce too much current. That was why I mentioned the mathematical
handicap LOL. I was thinking I would have to reduce the current with a
resistor or something, and had no idea how I would calculate the value of
the resistor. Thanks very much <S>.
P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW
version that I could insert in a signature.

V

> Hey V...go down to Battery World or something close, perhaps a local auto
> parts store...and buy yourself a 14Ahr sealed lead acid battery (gel cell)
> and a charger for it.

> I run most of my stuff off this type of battery.

> No hydrogen build up either.


> > Hi.
> > As a ham radio man, I am hoping you can help me out. I have a DX394
> receiver
> > and usually use ac to power it. I can run from a car battery, with the
> > adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can
> > build an emergency power supply so I can listen using batteries when the
> > trees take out the power lines <s>.

> > What I thought I could do is get a 9v lantern battery and add two 1.5
volt
> D
> > Cells . I am not mathematically inclined in the least. If I connect the
> > positive of the lantern and the negative of the lantern to the
> corresponding
> > terminals of the two D Cells, and connect all that to the adaptor plug
for
> > the back of the receiver, will it supply sufficient current to run
> properly
> > or not ? I could probably get an actual car battery, but would rather
not
> > have that in the apartment.

> > V Solidarity

 
 
 

Calling N8KDV

Post by starma » Mon, 05 Jan 2004 12:20:40


> Thanks everyone !  But about the current, how much current is a gel cell
> going to provide ? My concern was burnin gup the radio because the battery
> would produce too much current. That was why I mentioned the mathematical
> handicap LOL. I was thinking I would have to reduce the current with a
> resistor or something, and had no idea how I would calculate the value of
> the resistor. Thanks very much <S>.
> P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW
> version that I could insert in a signature.

If the battery is close to the correct voltage for the radio (12-V in
your case), it will use the right amount of current without having to
regulate it. The larger the battery capacity in Mah or Ah, the longer
the radio will run before you have to recharge the battery.

-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----==  Over 100,000 Newsgroups - 19 Different Servers! =-----

 
 
 

Calling N8KDV

Post by N8KD » Mon, 05 Jan 2004 12:41:58

The gel cell should certainly provide enough current. Your radio will not burn
up, it will draw the amount of current that it needs, regardless of how much the
gel cell is capable of providing.

> Thanks everyone !  But about the current, how much current is a gel cell
> going to provide ? My concern was burnin gup the radio because the battery
> would produce too much current. That was why I mentioned the mathematical
> handicap LOL. I was thinking I would have to reduce the current with a
> resistor or something, and had no idea how I would calculate the value of
> the resistor. Thanks very much <S>.
> P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW
> version that I could insert in a signature.

> V


> > Hey V...go down to Battery World or something close, perhaps a local auto
> > parts store...and buy yourself a 14Ahr sealed lead acid battery (gel cell)
> > and a charger for it.

> > I run most of my stuff off this type of battery.

> > No hydrogen build up either.


> > > Hi.
> > > As a ham radio man, I am hoping you can help me out. I have a DX394
> > receiver
> > > and usually use ac to power it. I can run from a car battery, with the
> > > adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can
> > > build an emergency power supply so I can listen using batteries when the
> > > trees take out the power lines <s>.

> > > What I thought I could do is get a 9v lantern battery and add two 1.5
> volt
> > D
> > > Cells . I am not mathematically inclined in the least. If I connect the
> > > positive of the lantern and the negative of the lantern to the
> > corresponding
> > > terminals of the two D Cells, and connect all that to the adaptor plug
> for
> > > the back of the receiver, will it supply sufficient current to run
> > properly
> > > or not ? I could probably get an actual car battery, but would rather
> not
> > > have that in the apartment.

> > > V Solidarity

 
 
 

Calling N8KDV

Post by WShoot » Mon, 05 Jan 2004 14:38:38

Lantern bateries come in 6-volt and 12-volt versions. They ain't cheap and they
often derate by setting on a store shelf a long time.

The little gel cell, float-charged by an ac or dc adapter, or solar cell, will
work fine. Any of these should provide current at least equal to the duty cycle
of the load current. Your radio requires 500 ma. So, if you use the radio an
average of one hour out of every ten, then the charger should provide at least
50 ma.

A correction regarding your suggested series connection of batteries: Connect
the positive terminal of one to the negative terminal of the other. The far
ends then would connect positive to positive and negative to negative on the
radio.

Bill, K5BY

 
 
 

Calling N8KDV

Post by RH » Mon, 05 Jan 2004 19:38:03

-- - --

Regardless of the power source AC or DC.

1.  If the Voltage is approprite (matched to) for the Device.

2.  Then it is the Device (Load) that determines the Current Flow.  

EXAMPLE:  A small 115VAC powered Transistor Radio plugged into
the 20 Amp 115VAC Outlet will NOT draw 20 Amps and Burn Out.

be101 ~ RHF  
= = = Basic Electricity 101  
.
.



> > Thanks everyone !  But about the current, how much current is a gel cell
> > going to provide ? My concern was burnin gup the radio because the battery
> > would produce too much current. That was why I mentioned the mathematical
> > handicap LOL. I was thinking I would have to reduce the current with a
> > resistor or something, and had no idea how I would calculate the value of
> > the resistor. Thanks very much <S>.
> > P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW
> > version that I could insert in a signature.

> If the battery is close to the correct voltage for the radio (12-V in
> your case), it will use the right amount of current without having to
> regulate it. The larger the battery capacity in Mah or Ah, the longer
> the radio will run before you have to recharge the battery.

> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----==  Over 100,000 Newsgroups - 19 Different Servers! =-----

 
 
 

Calling N8KDV

Post by Maximu » Tue, 06 Jan 2004 10:04:40

Thanks again. It is good to know ! enjoy your evening.
V

> The gel cell should certainly provide enough current. Your radio will not
burn
> up, it will draw the amount of current that it needs, regardless of how
much the
> gel cell is capable of providing.


> > Thanks everyone !  But about the current, how much current is a gel cell
> > going to provide ? My concern was burnin gup the radio because the
battery
> > would produce too much current. That was why I mentioned the
mathematical
> > handicap LOL. I was thinking I would have to reduce the current with a
> > resistor or something, and had no idea how I would calculate the value
of
> > the resistor. Thanks very much <S>.
> > P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW
> > version that I could insert in a signature.

> > V


> > > Hey V...go down to Battery World or something close, perhaps a local
auto
> > > parts store...and buy yourself a 14Ahr sealed lead acid battery (gel
cell)
> > > and a charger for it.

> > > I run most of my stuff off this type of battery.

> > > No hydrogen build up either.


> > > > Hi.
> > > > As a ham radio man, I am hoping you can help me out. I have a DX394
> > > receiver
> > > > and usually use ac to power it. I can run from a car battery, with
the
> > > > adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I
can
> > > > build an emergency power supply so I can listen using batteries when
the
> > > > trees take out the power lines <s>.

> > > > What I thought I could do is get a 9v lantern battery and add two
1.5
> > volt
> > > D
> > > > Cells . I am not mathematically inclined in the least. If I connect
the
> > > > positive of the lantern and the negative of the lantern to the
> > > corresponding
> > > > terminals of the two D Cells, and connect all that to the adaptor
plug
> > for
> > > > the back of the receiver, will it supply sufficient current to run
> > > properly
> > > > or not ? I could probably get an actual car battery, but would
rather
> > not
> > > > have that in the apartment.

> > > > V Solidarity

 
 
 

Calling N8KDV

Post by tom Hold » Wed, 07 Jan 2004 04:03:04




> > > > > Hi.
> > > > > As a ham radio man, I am hoping you can help me out. I have a DX394
>  receiver
> > > > > and usually use ac to power it. I can run from a car battery, with
>  the
> > > > > adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I
>  can
> > > > > build an emergency power supply so I can listen using batteries when
>  the
> > > > > trees take out the power lines <s>.

The DX-394 draws from 170 to 200 mA, not 500 mA, so any 12V battery
capable of a few hundred mA-hours will be able to run it. The larger
the ampere-hour capacity, the longer it will run without recharging.

For lots of info on the DX-394, consider joining the group
http://groups.yahoo.com/group/RADIOSHACKDX394/ (at the moment, Yahoo
seems to have a serious problem and nothing can be found on the group
website but it should be restored soon.)

Tom

 
 
 

Calling N8KDV

Post by Mike Maghaki » Wed, 07 Jan 2004 05:41:11

I have a DX-394 that I converted to run off 8AA's or a wall wart

works great


> Hi.
> As a ham radio man, I am hoping you can help me out. I have a DX394 receiver
> and usually use ac to power it. I can run from a car battery, with the
> adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can
> build an emergency power supply so I can listen using batteries when the
> trees take out the power lines <s>.

> What I thought I could do is get a 9v lantern battery and add two 1.5 volt D
> Cells . I am not mathematically inclined in the least. If I connect the
> positive of the lantern and the negative of the lantern to the corresponding
> terminals of the two D Cells, and connect all that to the adaptor plug for
> the back of the receiver, will it supply sufficient current to run properly
> or not ? I could probably get an actual car battery, but would rather not
> have that in the apartment.

> V Solidarity

 
 
 

Calling N8KDV

Post by Maximu » Thu, 15 Jan 2004 03:21:51

I have a Radio Shack PRO 2952 with a very irritating problem: after being on
for a while, it starts to go into an acoutical feedback loop. The only thing
I can do is turn the volume down, but I have to turn it down to the point
where I can barely hear it - or else turn it off for a while.

I thought maybe it was a problem with overheating, but I don't understand
the feedback problem. Any ideas what's causing this or how to fix it ? TIA
Maximus.

V

 
 
 

Calling N8KDV

Post by N8KD » Thu, 15 Jan 2004 03:31:43


> I have a Radio Shack PRO 2952 with a very irritating problem: after being on
> for a while, it starts to go into an acoutical feedback loop. The only thing
> I can do is turn the volume down, but I have to turn it down to the point
> where I can barely hear it - or else turn it off for a while.

> I thought maybe it was a problem with overheating, but I don't understand
> the feedback problem. Any ideas what's causing this or how to fix it ? TIA
> Maximus.

> V

I wish I could help! However I know nothing about that model, or even what it
is.

To be honest, I'm not terribly good at technical stuff. Basics yes, but when it
gets right down to it, I'm lost!

My Chief in the Navy told me I was lost too... ! But at least back then we had
good old vacumn tube stuff still in the fleet and it was a bit easier.

Is that a scanner by chance? If so, you might try rec.radio.scanner.

Thanks for asking though!

Steve
Holland, MI
Drake R7, R8 and R8B

 
 
 

Calling N8KDV

Post by Bob » Thu, 15 Jan 2004 09:12:30


>I have a Radio Shack PRO 2952 with a very irritating problem: after being on
>for a while, it starts to go into an acoutical feedback loop. The only thing
>I can do is turn the volume down, but I have to turn it down to the point
>where I can barely hear it - or else turn it off for a while.

>I thought maybe it was a problem with overheating, but I don't understand
>the feedback problem. Any ideas what's causing this or how to fix it ? TIA
>Maximus.

>V

You might try asking Bob Parnass...
http://parnass.com/