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Contributions and additional listings are both requested and welcome!
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The "MX Series" includes several crystal based (actually channel element based) and synthesized products that were first introduced in 1975. These radios including the MX320, MX330, MX340, MX350 and MX360 handhelds, the PX-300 and 500 packsets, the MTR-300 firetower repeater, the "APCOR" emergency medical repeater, and several others. Until the Saber series came out these were the top-of-the-line radios.

If you are at all serious about the MX Series you will want to subscribe to the Yahoo group devoted to the PX and MX Series radios

MX300 Parts List and Accessories List   1.2mb PDF file   Donated by A. Nony Mous

Note: All of the writeups below are out-of-print and no longer available. Parts availability is also a problem, especially for the channel elements, PL tone and DPL code elements, and the frequency and tone PROMS for the synthesized radios. Note that there were one-time PROMS and re-usable PROMS (called EEPROMS).

KJ6VU has a nice web page with some MX information at http://www.qsl.net/kj6vu/mx.html.

VK1KRF in Australia has a web page on how to substitute an inexpensive common 24 pin EPROM for the Moto code plug. See http://www.qsl.net/vk1krf/MX300/MX300.htm.

Another interesting page is at http://www.cahuenga.net/mx300.html.

The MX300 Series Theory and Maintenance Manual   This is the starting point for understanding these radios. Moto's part number for this manual is 68P81013C70 version A.
MX300 VHF Service Manual   This covers the H23AAU 1watt, H33AAU 2.5watt and H43AAU 6watt one through eight channel models. Moto's part number for this manual is 68P81013C71 version B.
MX300 UHF Service Manual   This covers the H24AAU 1watt, H34AAU 2watt and H44AAU 5watt one through eight channel models. Moto's part number for this manual is 68P81013C75 version B.
MX300-S VHF Service Manual   This covers the H23SSU 1watt, H33SSU 2.5watt and H43SSU 6watt synthesized models that held up to 12 channels in each of (up to) 4 zones. Moto's part number for this manual is 68P81022C10 version A.
Servicing MX Portable Radios     This is a training course handout. The last section covers the systhesized radios.
MTR300 Sales Brochure     This manual covers the MBC33CKA / MBC34CKA fire tower lookout repeater radio that is based on the MX Series Handheld components built into slide-in modules and sized to fit a Spectra-Tac chassis. Note that this unit was made by Motorola Canada (hence the MB prefix in front of the C3xCKA model numbers).
MTR300 Installation Manual     This manual covers the MBC33CKA / MBC34CKA fire tower lookout repeater radio that is based on the MX Series Handheld components. Moto's part number for this manual is 68P02900A35 version A.

Other manuals relevant to the MX Series are:


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This web page created January 2007

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This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors.   All Rights Reserved, including that of paper and web publication elsewhere.