[Milsurplus] LS-454 with manpacks

[W2HX]

I am pretty sure they are both 600 ohms 

73 Eugene W2HX


-----Original Message-----
From: J. Forster [mailto:jfor at quik.com] 
Sent: Saturday, September 19, 2009 2:41 PM
To: Eugene Hertz
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] LS-454 with manpacks

Gene,

Before hooking things up, did you check the spec'd load impedance for the
radio and the input impedance for the speaker?  If so, what are they?

-John

=============


> Hi all,
>
>
>
> Tried to connect an LS-454 to my PRC-174 today. What a failure! First, I
> found out (the hard way) that the LS-454 has a different pin out. So I
> moved
> the wire from "E" to "B".
>
>
>
> But then the radio simply didn't have enough audio output power to power
> this speaker. Surprising because on a H-189 the volume can make my ear
> explode!  I wonder if I damaged the matching transformer inside the 454
> after inadvertently applying 12V and ground to the 600 input? Anyone know
> the proper DC resistance for the 600 ohm input of the transformer?
>
>
>
> So I guess I will need to install a little audio amp. But worse, I will
> need
> to run a 3rd wire for supply voltage (in E 12V).  So it looks like a whole
> new cable will be required.
>
>
>
> Anyone have suggestions on how to best accomplish the goal of a speaker on
> an PRC?
>
>
>
> 73 Eugene W2HX
>
>
>
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