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We had this box out this past weekend and it worked perfectly with an RT-524 in a friends M151A2. I've put together a couple of them now for people and all the feedback is positive.

The latest update on the Racal headset project. The adapter box works exactly as intended and wired as explained above. The pot that was added for reducing mic gain did nothing with the 8 headsets we tried it with and was removed. The ANR circuit kicks in when anything over 9 volts is applied...

Here's a picture of V3 of the adapter box. I had a bad connection in the U229 plug that I needed to fix and on your note I've epoxied a 20K trimpot to the inside of the adapter box to make the mic gain adjustable. I used a Hammond 1590A box for the project and everything fits into it well...

The CX13479 bailout cords are getting a bit hard to find but here's another solution. This cable is made by Racal specifically to replace the long bailout cords with a shorter version. They can be purchased from Racal as pn#437936 but they're $200. Better to find them online if you can. We...

The CX13479 bailout cords are getting a bit hard to find but here's another solution. This cable is made by Racal specifically to replace the long bailout cords with a shorter version. They can be purchased from Racal as pn#437936 but they're $200. Better to find them online if you can.

Steve, if the 174 is powering pin E of the U229 connector then all you'll need to do to get the ANR working is wire it to pin F of the U329 connector on the headset. The high gain issue on the mic could be fixed with a resistor inline but just moving the mic away from your mouth might also do...

Last weekend we took out a Sincgars set and a PRC-68 and tested the headsets with a small junction box that I made up to the test wiring and to be able to reconfigure it if necessary. Our tests proved the Racal Raptors will work with the older VIC-1 and earlier PRC radios by either rewiring the...

After some more testing we determined that the electret microphones used in these headsets needs a small bias voltage on them before they'll work. The older military radios don't provide that voltage so we're going to have to come up with a simple circuit that will provide it. Merely...

Pin out for the Racal CX 14379: Looking at this schematic I just realized that pin E is the mike return that may not be connected in the older radios. I need to try connecting E to A and see what happens then. Kurt KG6KMJ

Here's what I've found out about Bailout cables and some new headsets I just bought to try with the HMMWV radios: This is the original CX 86508/GR or CX 10766/GR bailout cable, "9v battery" style connector, dual UG229 5 pin audio connectors This was replaced with an SM-D-037478 cable with...

I just found a bag of new bailout cables with the dual connector setup on them that were for the VIC-1 system that I'm going to try. I'll post the results when I do.

I'm aware that they work just fine on VIC3 systems but I don't have an intercom in the HMMWV and would like to use them with other radios. We use them in a friends HMMWV all the time on his VIC3. I have a fairly large collection of military HF, VHF, and UHF transceivers some of which have the...

Has anyone had and luck using the RA5000/6400 Racal headsets that are coming available now on their military radios? I have friends that are using them successfully with VIC-3 intercoms but I'm not having much luck using them with either the 524 or the 1439.