[NJARC] Antenna Balun

[Al Klase]

Scott,

Yes the balanced antenna should be quieter on shortwave than the random 
wire. You might want to arrange some sort of A-B switch to better 
understand the difference as you tune around.

I'm not surprised you didn't hear much on long wave. A doublet antenna's 
response falls off dramatically below the frequency where it is an 
electrical half-wave in length (a dipole). Tie the inner and outer 
conductors of the feed line together and connect to the antenna post 
then connect an earth ground to the ground terminal for long-wave listening.

Al

Scott Roberts wrote:
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Thanks Al-
> I ended up building a center fed dipole version of the
> Slinky antenna for a couple reasons. I used the 4:1
> balun design shown in your "full blown system" pic: I
> built it based on best guess as to what the dots
> meant, as I hadn't gotten your reply yet- I think I
> got it right from how you described it. I tested it
> last night with the BC 348 and my "alzwhire" antenna,
> and it seemed to have a nice effect- it seemed to
> smooth a lot of noise out, and I was getting some
> decent signals on all bands(except the 200-500kc.- not
> much there it appears). Even got Radio Australia on
> about 9.6mhz!(at 0800Z) Nice strong signal, too.
>
> I will recheck my setup based on what you just told
> me- worst case, I have it backwards... Can't wait to
> see how it works with the 1/2 a** slinky, rather than
> my 1/4 a** alzwhire...
>
> Thanks again! Have fun(everybody!) at the party
> tomorrow night! Wish I could make it, but I have a
> prior commitment...
>
> Scott
>
> --- Al Klase <al at ar88.net> wrote:
>
>   
>> Visit our web site - See http://www.njarc.org
>> _______________________________________________
>>
>>
>> Scott Roberts wrote:
>>     
>>> .....Also, I have forgotten the meaning of the big
>>>       
>> black
>>     
>>> dot next to each transformer.
>>>   
>>>       
>> The dot indicates the START end of the winding. 
>> Phasing is important.
>>     
>>> And finally, are all three transformers 5 trifilar
>>> turns? (3 pieces wire, twisted, passed through one
>>> aperture of the core, with 5 reverses in
>>>       
>> direction?)
>>     
>>>   
>>>       
>> One turn means you go though one of the holes in the
>> "binocular" core 
>> and back through the other hole.  The exception is
>> the designs that 
>> specify "in one apateur".  Then a turn just goes
>> through one of the 
>> holes, and back around the outside.
>>
>> Al
>>
>>     
>
>
>
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>   

-- 
Al Klase – N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/