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Thread: Motorola PA information needed

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  1. #1

    Default Motorola PA information needed

    Good Evening folks

    I got this PA a few weeks ago in a hamfest but couldn't find any information. It had a sticker saying "Motorola 6 mts. Power Amplifier" and that was it (please see attached pictures)
    I am building a 6 mts. transverter and looking for the possibility of using this one as an amplifier.
    I would appreciate any help.

    Thank you in advance and have a good day

    73
    Aldo CX4BBD
    Attached Images Attached Images

  2. #2
    Join Date
    Oct 2004
    Location
    New England, USA
    Posts
    346

    Default

    Looks to me like the RF section of an older mobile radio, perhaps a Syntor. Looks older than a Maratrac.

  3. #3

    Default

    Looks like a Micor to which someone has added an additional heatsink.

    This amplifier is only good for CW or FM/PM since it runs Class "C". Definitely not suitable for use where a true linear amplifier is needed (i.e. SSB or AM).

    Glen, K9STH

  4. #4
    Join Date
    Apr 2001
    Location
    north central Connecticut
    Posts
    1,088

    Default

    Looks like a GE Mastr Pro to me That board shows a GE part number, and those aren't Motorola in-house transistors.

    Pete

  5. #5
    Join Date
    Oct 2004
    Location
    New England, USA
    Posts
    346

    Default

    Quote Originally Posted by K1ZJH View Post
    Looks like a GE Mastr Pro to me That board shows a GE part number, and those aren't Motorola in-house transistors.

    Pete
    That is exactly what my initial impulse was! I have a Delta SX and it looks very similar. But I went with the Motorola assumption...

  6. #6

    Post

    The Heat-sink design is GE MASTR series .. this unit has been pulled and modified.
    Identical castings to a 110 watt VHF GE MASTR II mobile unit that I have in garage
    This may have come from a mobile unit or a rack-mount repeater radio.

    The 9-pin test-set connector (black plug-in connector in photo) is same one used for the GE MASTR II,

    Motorola did not use this style of connector and the GE MASTR-PRO series used a different style of test-set connector !!
    The MASTR PRO was also a Hybrid PA design using vacuum tubes for drivers and final PA tube.

    GO TO Repeater Builders TIP, and use that GE part number: PL19xxxx
    http://www.repeater-builder.com/rbtip/

    They should be able to quickly Cross Reference to GE Manuals, specifications, etc.
    http://www.repeater-builder.com/rbtip/geindex.html

    ==
    w9gb
    Last edited by W9GB; 02-22-2012 at 04:15 PM.
    Nullius in verba

  7. #7

    Default

    Good Evening guys

    Thank you for all the information you guys provided me. I remember an old GE VHF transceiver that I had several years ago with a heatsink very similar to this one.
    So now I have a much better view on where to direct my search, a GE Mastr II. I was looking at the Repeater Builder site before posting, by the way a fantastic site, but not on the right spot

    One more time: I really and greatly appreciate all your help

    73
    Aldo CX4BBD

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