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Auto tunners , higher end , or adjusting ?

Discussion in 'Amateur Radio Equipment Reviews' started by KD0CAC, Mar 29, 2012.

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  1. KD0CAC

    KD0CAC Ham Member QRZ Page

    I have had a couple of manual tuners , my current is a Palstar AT2K and I'm happy with it , except when time is an issue .
    My current auto tuner is in my Kenwood TS-850Sat .
    The question is the auto tuner can not tune reflected power as low as I can tune with the Palstar , I always get reflected to 0 .
    So I am wandering if some , or any of the auto tuners can be set to bring reflected to 0 , or very close to ?
    Maybe most important with QRP , but I take pride in getting my station / on-air sound as good as possible .
  2. KF6ABU

    KF6ABU Ham Member QRZ Page

    I have 2 auto tuners by mfj. With both of them I can set the target swr to 1:1 if i'd like. from the factory they aim for 1.5:1. The SWR only needs to be low enough to not cuase power to fold back on your radio.
  3. KG4NEL

    KG4NEL Ham Member QRZ Page

    Yep, if the algorithm is set to stop tuning after a certain threshold has been met, it'll stop there. With the manual, you have no such limitation :)
  4. KF6ABU

    KF6ABU Ham Member QRZ Page

    Using an antenna tuner to get the SWR down will not make any difference on how you sound whether its 1:1 or 2:1 if it’s not causing your radios power to fold back. You are just changing what your radio sees.
  5. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    That's very true. Your rig won't "sound" any different if the VSWR is 1.5.

    No benefit in tuning for "zero" reflected power, and in fact is kind of a time suck for me. I never bother.
  6. KJ5T

    KJ5T Ham Member QRZ Page

    A 1.5 SWR is not the end of the world. Most modern radios will cut back power if the SWR is really an issue. You should be fine with the 1.5 SWR and so would suggest just using the tuner in the Kenwood and save yourself the time.
  7. KD4HSO

    KD4HSO Ham Member QRZ Page

    Not necessarily; that would only be true for CW. The TX IMD specs are typically for a 50 Ohm load. Your PA won't see an optimum load line, clipping the peaks of the RF envelope. You'll have to back off the power as VSWR increases to maintain linearity. The IMD will probably climb well before the rig folds back; assuming it even does.
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