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rm 550 amp.

  • 03-10-2010 7:49am
    #1
    sensormatic
    Registered Users, Registered Users 2 Posts: 311 ✭✭


    i have be offered the above amp and was wondering if anybody here ever used one, i have be unable to find much info from users of the amp.
    thanks.


Comments

  • #2
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    http://www.rmitaly.com/scheda.asp?IDGr=5&cat=0&tipo=103

    I'd not touch it with a barge pole.

    Rubbish for Amateur Radio and illegal for anything else.

    http://radiopics.com/Power%20Amplifiers/RM%20Italy/RM%20Italy_KLV-550.htm

    I'd guess with experience of other RM Italy products it's maybe 300W PEP on SSB and 75W on AM. With wind behind it.

    Looking the schematic I see
    Uses a pair of 150W PEP MRF422 transistors as PA. So realistically it's 150W max in push pull on FM and 35W AM.

    RMS power can't really be more than 150W SSB.

    It's probably "really" a 100W Amp.

    There is just single coil low pass filter (cut off 35 to 40MHz Probably) so on Amateur bands exceeds legal out of band emissions on 29MHz by at least 40dB and it's likely useless below 18MHz or 21MHz.

    So would need multipole set of band filters for Amateur use.

    It's illegal totally on CB, apart from fact that the filtering is totally inadequate. Huge interference on Band I, VHF FM, Air Band etc.

    If you know how to make proper elliptic filters (about 3 coils and 7 capacitors needed per band) , got it for nothing and have an Amateur licence, then maybe consider it. Otherwise avoid


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