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User-Adjustable Variable TX Bandwidth (TS-590 vs FT-2000)

Discussion in 'General Technical Questions and Answers' started by HK2LS, Apr 3, 2012.

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  1. HK2LS

    HK2LS Ham Member QRZ Page

    I noticed this is available on the TS-2000. I currently have a TS-590 and am thinking of getting a FT-2000. I'm curious - if you increase the TX bandwidth do you reduce the output power? From what I can tell the FT-2000 needs an option filter for 309 USD to make it a contest station..

    I wish the TS-590 had this feature as it seems you could really have a punch of a signal on SSB..

    73s from Colombia..
  2. M0GVZ

    M0GVZ XML Subscriber QRZ Page

    Not that the station at the other end would notice. To increase the miles per watt you'd need to decrease the bandwidth far beyond what would still be readable in SSB.

    The TS590 does have a TX bandwidth adjustment using menu 25 and 26 for low and high TX cut.
  3. K8JD

    K8JD Ham Member QRZ Page

    Larry, You have this backwards ! The modes with the norrower bandwidth have the most signal to noise ratio and require less power for the same (distance) effective results.
  4. HK2LS

    HK2LS Ham Member QRZ Page

    I know that - I must have worded the statement wrong. Less bandwidth more power - more bandwidth less power (given the same distance).
  5. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    The problem is, making an SSB signal too narrow means you must roll off (or completely cut off) a lot of higher frequency components of voice modulation, and that's where all the "intelligibility" happens. I can TX in a 1.5 kHz bandwidth if I want to (the Ten Tecs let you do almost anything, since the signal is fully created by DSP) but almost nobody can understand it. I find I "get through" best, and have the most understandable, intelligible, easy-to-copy under "weak signal" conditions signal possible with just about 3 kHz bandwidth. I usually set it for about 2.7 kHz, with a low frequency cutoff at 300 Hz and a high frequency cutoff at 3 kHz, and that's almost as good.

    Setting it for less doesn't make one single extra contact.
  6. N0AZZ

    N0AZZ Ham Member QRZ Page

    You are correct the FT-2000 is much more adjustable and all DSP controlled as does the FT-5000 I have had them both, still have the 5000.
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