[Milsurplus] More thoughts on using LS-454 speakers with manpacks

[Mark]

Many manpacks (like the PRC-1099) have audio outputs specified as 600-ohm, but actually use devices like LM386s in the audio which operate over a wide range of impedances but work best at lower impedances (4 - 8 ohms).

I keep two LS-454s handy.  One has just the connector pin rewired to allow use with packsets and other radios that really have 600-ohm outputs.  The second one has the connector mod AND the internal transformer jumped out so the cable goes straight through to the 8-ohm speaker.

The PRC-74 will produce quite a bit more audio with the 8-ohm LS-454.  In fact on some radios you'll get enough audio to produce feedback on transmit if you have your volume set too high.

--Mark
  KI0PF

Author of "Mil Spec Radio Gear Volume 2"
Available direct from the author, Universal Radio, 
and Fair Radio.
$29 cash/check/M.O. or $30.17 via Paypal, when ordered direct 
& shipped to the U.S. (Foreign buyers please contact me). 
See: www.mmfrancis.com/MSRG2/MSRG2.pdf

Volume 1 is still available from CQ, Universal Radio, and 
Amazon.