Results 1 to 3 of 3

Thread: Converting HP UHF spectra to HP astro spectra.

  1. #1
    Join Date
    Jun 26, 2012
    New York
    Thanked 48 Times in 24 Posts

    Default Converting HP UHF spectra to HP astro spectra.

    Sorry if this question has been asked before. I did a quick search and couldn't come up with any info. Here or on google.

    I have a few high power UHF spectras laying around and I wanted to do some tinkering.

    What would I need to do convert a HP spectra to a HP astro. IE what boards do I need? Is it a simple just swap some boards out change the control head and blow a correct S record in and re align?

  2. #2
    Join Date
    Mar 03, 2012
    Thanked 87 Times in 31 Posts
    Country: United States


    The following applies to regular power Spectras. I don't know what (if anything) is different about high power radios, as I have never worked with them.

    You'll need the RF board and the logic board from an Astro Spectra. The RF board is not split-dependent; that is, you can take the RF board from a 403-433 Astro Spectra (for example) and use it for your project. The parts that are split-dependent (PA, VCO, and preselector) are interchangeable between Astro and regular Spectras. You can use the logic board from any Astro Spectra (VHF, UHF, 800). You can actually use the RF board from any band radio as well, but you'll have to swap a lot of individual components. I know someone who converted an 800 board to a UHF. It works fine, but not worth the time and effort unless you really like soldering. It would be easiest to get the RF board from a UHF Astro Spectra (but again, split doesn't matter).

    I've done the conversion before and it was pretty easy.

  3. #3
    Alpha's Avatar
    Alpha is offline T S - Moderator
    CS Forums $upporter
    Join Date
    Feb 12, 2012
    Directly above the center of the earth.
    Thanked 1,531 Times in 738 Posts
    Country: Christmas Island


    There are several threads on this forum that address this conversion in detail; you may need to modify the VCO slightly to get it lock down to 442 MHz or below if this is for ham use. I posted quite a few how-to messages on here related to VCO conversion and modification. Do a Google site-specific search for Spectra VCO, or VCO Mod.