"Doug Smith W9WI" wrote in message
...
Lucky wrote:
1] Will I compromise any of the excellent qualities of the Astron PSU or
effect how the radio receives it's voltage purely by using these
differing cables?

No.

As long as the smallest cable is big enough to pass the necessary current,
it doesn't matter if you also have a larger cable in the circuit. I note
Radio Shack rates the 270-025 cable at 4.6 amps, so it's more than big
enough for your equipment.

2] You say the higher voltage rating for the fuses keeps the power from
arcing. How is it determined what voltage rating you should use? By the
voltage that is going to flow thru the wires or by what the PSU can put
out?

Well, both voltages (that which will be in the cables, and that which the
PSU puts out) are the same, 13.8 volts.

The voltage rating of the fuses must be at least as great as the voltage
on the circuit you're protecting. You should have a reasonable safety
factor; the voltage rating of the fuses should exceed the actual voltage
by at least 2x - i.e., the fuses should be rated at least 28 volts in your
case.

I've never seen a fuse rated at less than 32 volts, so you shouldn't have
a problem. 250-volt fuses are fine.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com


Hi Doug

Thank you once again for your knowledge. As I proceeded with the hookup
procedure, I decided to change things.

The DC cable with the fuse holder is 4Ft long. The extention Adaptaplug
cable is 6ft long. I bought both since I figured I'd keep the Astron PSU as
far from the radios as possible. So that's like 10 ft long together.

I'm going to keep the PSU under my glass/wood radio table and now 10 ft just
seems too long. I don't want uneeded lengths of wire around the radios that
cause clutter and may pick up local RFI.

So, I've decided to just go with the 6 ft of Adaptaplug cable, cut out the
fuse holder from the other 4 ft cable and solder it in line with the 6 ft
adaptaplug cable.

Problem is, I tried looking up the current rating capacity of this
adaptaplug cable. I can't find any specs on it's properties on RS's site
like it shows for the 4ft DC cable. The part # is 273-1740 for the 6 ft
adaptaplug cable I want to use for the entire length.

Do you think this cable has the needed current rating for my use? This
cable's wires are much thinner then the other cables 22 AWG size. I can't
even find the adaptaplugs cable AWG.

Can I use it safely? What do you guys think? I think most of these
adaptaplugs cables are used for wall worts.

Lucky

Lucky wrote:
The DC cable with the fuse holder is 4Ft long. The extention Adaptaplug
cable is 6ft long. I bought both since I figured I'd keep the Astron PSU as
far from the radios as possible. So that's like 10 ft long together.

I don't think there's any need to keep the PSU as far from the radios as
possible. The SL-11A is not a switching supply, so it's not likely to
generate noise. (I've not used a SL-11A but I do have a RS-20A which is
perfectly quiet.)

Problem is, I tried looking up the current rating capacity of this
adaptaplug cable. I can't find any specs on it's properties on RS's site
like it shows for the 4ft DC cable. The part # is 273-1740 for the 6 ft
adaptaplug cable I want to use for the entire length.

Do you think this cable has the needed current rating for my use? This
cable's wires are much thinner then the other cables 22 AWG size. I can't
even find the adaptaplugs cable AWG.

Probably. 1.1 amps really isn't much current; it doesn't take a very
big wire to carry it safely.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com