Help With Tuning EF-Quad

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  • #936
    Dale Athanas

    Have been out of ham radio for 30 years – just getting back in. Put up the EF-Quad and was surprised to find that the SWR on 40, 20 and 15 was no higher than 1.3 at both ends of the bands – pretty amazing. However, on 10 I have 2.0 at 2800 and 1.7 at 28300. Since I am only running 15 watts I would like to get this a little lower. I am nervous about cutting the stub as I am afraid I might make things worse instead of better. Can anyone tell me if I should cut the stub and by @ how much in each increment.


    What areas of 10 meters will you be operating in mostly?
    If it is CW you don’t need to do anything. If it is SSB and you are staying in the 28.300 to 28.500 voice section (tech license) the VSWR looks like it is getting better. (lower) If the SWR is 2:0 at 28.000 and 1:7 at 28.300 then it is likely going to be less (1:5) at 28.600.
    can you tell us a little about your set up and deployment?
    Antenna height and direction?
    Any surroinding objests etc. All information helps.
    but just looking at the numbers you have provided it looks good.
    An SWR of 1:7.1 is plenty acceptable. Any SWR beolw 2:0.1 is acceptable to the radio.


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