A Tecsun PL-330 features reference sheet

Many thanks to SWLing Post contributor,  Jaap de Goede, who shares the following as an update to his Tecsun PL-330 review. Jack writes:

I discovered several features that are not displayed on the keyboard both on the Internet and by fiddling with the radio. Maybe these features are in the Chinese manual but I simply can’t read that language. What became clear is that the PL-330 resembles the PL-990x. But I couldn’t find if DNR and Muting Threshold are supported in the firmware I have (3302). Here is a table with the features and how to operate:

Click here to download as a PDF.

Many thanks for creating and sharing this excellent reference sheet, Jaap!

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9 thoughts on “A Tecsun PL-330 features reference sheet

  1. Mangosman

    In Australia the FM channels start at 88.1 MHz and in the same coverage area the next channel is 88.9 MHz. In the adjacent areas they use 88.5 MHz and 89.3 MHz. This is because at 75 kHz deviation the channel is 0.2 MHz wide (200 kHz). If 50 kHz deviation is used the channel width narrows to 0.1 MHz.
    There must be a lack of transmissions around each signal to prevent interference by 100 kHz on each side.
    For the fastest scan the step size should be 0.2 MHz in 75 kHz deviation systems and 0.1 MHz in 50 kHz deviation systems. This minimises interference due to a lack of channel overlap.

    The other confusion is the pre-emphasis which boosts the high pitched sounds prior to transmissions and reduces them in the receiver along with the hiss. North America uses 75 ?s and the rest of the world uses the gentler 50 ?s.

    With the numbers but not the meanings being the same, beware.

    Reply
    1. Jaap

      Thanks, that’s clear. The implementation in firmware 3302 is a minimum step size of 10 kHz, regardless of the deviation set.

      Reply
  2. Mangosman

    Babis,
    Australia uses 75 kHz deviation which creates a signal bandwidth of 200 kHz = 0.2 MHz. So the regulator allocated licences which are in one area such as 88.1 MHz the next transmitter is on 88.9 MHz. In the adjacent coverage areas the frequencies are 88.5 MHz and 89.3 MHz. Not need for tiny steps.

    For the quickest scanning you want a scanning step of 0.2 MHz.

    Since the signals for 50 KHz deviation will produce a signal bandwidth of 100 kHz making 0.1 MHz the optimum size.

    So the deviation selection is about the bandwidth of the filter in the receiver to separate signals, not the step size in tuning from one channel to the next.

    Lastly the other confusion is the pre-emphasis which is the boost to the high pitched sounds prior to broadcast and the reduction of the high pitched sounds in reception. This minimises the hiss.
    In North America they use 75 ?s and elsewhere they use the more gentle 50 ?s.

    Reply
    1. Babis

      thanks for the info, i guess when 330 will be available (perhaps export version) will try test if i see visible differences … in mean time i am trying to see if pocket can afford a 990

      Reply
  3. Jaap

    Hi Babis,

    I made a mistake. The FM deviation should be in kHz and not Hz. Anyway, that has nothing to do with the tuning step size in FM. The minimum step size in the FM broadcast band is 10 kHz.

    Reply
    1. 13dka

      FM deviation is never stated in radio spec sheets because that’s more a property of the transmitter defining it bandwidth. What that box should read is “Deemphasis”, which is 75 ?s for the US, South Korea and AFAIK Columbia and 50 ?s for the rest of the world, that’s why it’s switchable..

      Reply
      1. 13dka

        Errr.. Colombia, not Columbia, and the comment function can’t digest the symbol for “micro”, so ‘?s’ should read “microseconds”.

        Reply
  4. Babis

    ?hanks for the info, nice to have 50hz steps at FM for us here in Europe, it looks will be helpful because when is a good day with tropo, sometime can be 3 radio stations at same freq (fm) so it may helps to hear & identify them easier by fine tuning … i hope anon-co have it by end of this month

    Reply

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