Fort Collins B-17
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  • BC-458

    The BC-458 is a part of the SCR-274-N command set used onboard the B-17G vintage 1944. It is a 4-tube unit, containing an oscillator, indicator, and two transmitter tubes. High voltage is supplied externally via a BC-456 unit, shown elsewhere on the site. It covers the frequency range of 5.3 to 7 megacycles on the shortwave band, although it can overtune up to approximately 7.2 MC, despite not being marked. This allows for the SCR-274-N to cover all frequencies entirely without gaps.

    The set is a single modular transmitter unit which could be placed in a set of two or four. On a typical B-17, the set would have been matched with a BC-459 or BC-457, which cover frequencies on either side of the BC-458. On later variants, a single VHF set (such as the BC-458) would be accompanied by a UHF set (up to 150 MC, now in the VHF band).

    As with all of our SCR-274-N equipment, as well as our BC-348 unit, we would like to thank Mike, who runs his own site here: AAF Radio. Without his knowledge, we would not have the functioning and accurate sets that we do.

    458
    BC-458 With Cover Removed

    458
    Front Controls

    458
    Side View

    458
    Closeup of IF Can Warning

    458
    Rear View

    458
    Left Side View

    458
    Crystal Unit

    458
    Crystal Unit

    458
    Crystal Unit

    458
    Crystal Unit