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It can be confusin'.

[ILLUSTRATION OMITTED] Caption: WHEN YOU HOLD AN H-250 OR H-350 HANDSET CHANCES ARE GOOD YOU'RE NOT CONFUSED ABOUT WHAT TO DO OR HOW TO DO IT.

IT'S THE OTHER END OF THE HANDSET

THE END WITH THE CABLE CONNECTION, WHERE THINGS GET A LITTLE CRAZY!

SOME OF THE CONNECTORS HAVE FIVE PINS AND SOME HAVE SIX.

SOME OF THE PINS PROTRUDE A BIT WHILE OTHERS ARE ALMOST FLAT TO THEIR SURFACE

SOME OF THE PIN SURFACES ARE LIGHT BLUE WHILE OTHERS ARE DARK BLUE. AND SOME OF THE CONNECTORS ARE BLACK, WHILE ATHERS ARE METALLIC.

IT'S ENOUGH TO MAKE ANY COMMUNICATOR GRAB HIS HEAD AND SHOUT--

STOP THE MADNESS!

WE'RE HERE TO DO JUST THAT!

The H-350 handset, NSN 596501-128-3944, was made for the Air Force and has a six-pin connector with a part number of S1329/U or AP-116. The H-350 has a wider microphone frequency response range than the H-250. The H-350 is now the standard handset for tactical field telephone sets.

The sixth pin on the H-350 is often called Pin K Pin F is "hot" and gives the H-350 full-duplex operation over telephone circuits.

The H-250, NSN 593500-043-3463, has a five-pin metallic connector plug, U-229A/U, NSN 5935-00-992-2035. Other plugs are obsolete. The H-250 is wired differently than the H-350 and they are not interchangeable. The H-250 is used on Army tactical radios only.

Compatibility

The fly-in-the-ointment for these two handsets is compatibility. It the piece of equipment you are connecting up to is set to receive 5 pins, you can use both the H-250 and the H-350. The sixth pin on the H-350 will do nothing--no harm, no foul.

However, if you hook up a five-pin connector to a six-pin receptacle, you will lose either a ground or duplex capabilities depending upon the piece of equipment.

Finally, do not hook the H-350 six-pin connector up to a six-pin receptacle when that sixth pin is expecting a ground and instead getting a "hot" pin. This will cause static and feedback over your handset.

I'M A SIX-PIN CONNECTOR... AND I'M HOT!

I'M 5-PIN, AND I'M NOT INTERCHANGEABLE

I-I'M LOSING GROUND. WHAT'S HAPPENING!?

"YOU'RE A FIVE-PIN CONNECTOR IN a SIX-PIN RECEPTACLE.
COPYRIGHT 2006 PS Magazine
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2006, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Title Annotation:H-250, H-350 Handsets...
Publication:PS, the Preventive Maintenance Monthly
Geographic Code:1USA
Date:Apr 1, 2006
Words:363
Previous Article:An antenna dilemma.
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