[Johnson] Baluns on tuners

[Ron]

I think here you must have a balanced load and work your way back to the 
transmitter.

The balun will stop feedline radiation from the balun back to the 
transmitter but forward of the balun with an unbalanced load will still 
radiate from the feedline.

Your core material might be different  or you may be saturating the core 
with too many turns.

For a sine wave  Max flux = Max Voltage / (4.44 X Frequency X Turns)

---
Ron


In Silvercity wrote:

>
> Lee:
>
> Interesting report.
>
> I have played with my high-pass T tuner both with and without a balun, 
> and not surprisingly, no one heard any difference. I decided to use a 
> balun because I wanted to fiddle with winding them, and NOT because i 
> was especially worried about unbalanced feeders, which is supposed to 
> cause more feeline radiation.
>
> That said, I found not all baluns are created equal, and try as I 
> might, I never could obtain a balun that was actually balanced (in my 
> test jig) for the entire 160-10 meter range. Therefore, I ended up 
> with two baluns, one that worked pretty well for 160-80-40, and one 
> that worked pretty well for 80-10. Since I seldom operate on 160, I 
> use the 80-10 balun. It falls off on 10 meters, but what the heck.
>
> By the way, an RF ammeter in series with each leg (I had only one 
> meter, so I just moved it  between each leg and hoped for the best) is 
> another good way to tell if your balun is actually balancing, or just 
> sitting there looking pretty.
>
> But no doubt about it, a balun is pretty stressed to work in the 
> typical tuner. And sometimes, they just don't. Things are not balanced.
>
> Anyway, those are just my experiences, and I am certainly no engineer, 
> just a ham.
>
> Richard
> WB5NEN
>
>
> Johnson mailing list
> Home: http://mailman.qth.net/mailman/listinfo/johnson
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Johnson at mailman.qth.net
>
>
>
> _____________________________________________________
> This message scanned for viruses by CoreComm
>
>