B-nut HF9V users question - Elmers Forum at eHam.net

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eHam.net Forum : Elmers : B-nut HF9V users question

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B-nut HF9V users question	Reply
by W8JJI on December 26, 2003	Mail this to a friend!
To those of you out there using a Butternut HF9V I have the following question,... How is your SWR on the warc bands ? I have read and heard that an SWR below 2.o is just not possible on 17 and 12 meters. I have already spoke to butternut about this and they say there shouldn't be a problem etc... Any input here would be greatly appriciated . Thanks !

RE: B-nut HF9V users question	Reply
by K0RS on December 26, 2003	Mail this to a friend!
I couldn't get my HF-9 to work well on 12, but I admit to not putting much effort into it, since I already had a Yagi on 12m. I removed the 12m loading coil assembly. I have worked others with HF-9's on 12, so I know it can be done. The coil adjustments and positioning are critical, so some experimentation will be required. OTOH, my HF-9 works well on 17m. Again, the coil settings are critical. Even a slight change in the angle of the capacitive loading hat changes the SWR. Also, My HF-9 would not load correctly on 17 without the coaxial tuning stub that attaches to the feedpoint. Make sure that is installed.

RE: B-nut HF9V users question	Reply
by K5LXP on December 26, 2003	Mail this to a friend!
I just checked mine, I get 1.4:1 on 17M and 1.7:1 on 12M, but they can be tedious to tune. I spent the better part of an afternoon setting mine up, going back and forth on the adjustments and making minor tweaks until the match was best in the parts of the bands I wanted. Be sure you've got a good counterpoise or radial setup. Follow the instructions. Using an analyzer to tune the antenna nearby will make this a less painful process as you can see the results of your tweaking immediately. The 17 and 12M adjustments are the most sensitive, even just bending the capacitive hats slightly can have a significant effect. Once it's set up it tends to stay that way, so a little effort now will pay off in long term use. Mark K5LXP Albuquerque, NM k5lxp@arrl.net

RE: B-nut HF9V users question	Reply
by RobertKoernerExAE7G on December 27, 2003	Mail this to a friend!
What would the extra loss in your feedline be at 1.5:, 2:1, and 2.5:1 be? You can look this up in any ARRL HandBook. If it is insignificant, and your rig will drive the load with close to full output, why worry about it? 73 Bob

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