Jim Brown wrote:
> On Wed, 05 Mar 2008 23:09:58 -0500, Roger (K8RI) wrote:
>
>
>> I've been looking at the series 830, 831 an 832 balun kits from the
>> wireman. These use T-200-1 and T-200-2 cores. Would a balun like these
>> be capable of handling the full 75/80 meter band with the legal limit
>> CCS (Digital). I figure the SWR could reach between 3 and 4:1.
>>
>
> Your time would be far better spent studying my work on common mode
> chokes.
>
> http://audiosystemsgroup.com/RFI-Ham.pdf
>
> and
>
> http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf
>
> The Wireman's "balun kit" is a VERY weak common mode choke balun. In
>
I don't plan on using a choke balun. What I'm planning on winding is a
1:1 balun where both sides of the antenna are at aDC ground although I
may put a choke back near the remote antenna switch.
73
Roger (K8RI)
> other words, it isn't worth the powder to blow it to you know where. Same
> for the Amidon and Palomar stuff. A real ripoff.
>
> The ONLY commercial baluns worth the money are the big ones that DX
> Engineering makes. Not only do they "handle power," they also provide
> excellent choking action. But they aren't cheap -- about $130. But you
> can build your own that is as good as the DXE for under $30. My tutorial
> tells you how.
>
> As to power handling -- it has NOTHING to do with SWR, but depends only
> on the UNBALANCE of the antenna and the impedance of the choke.
>
I've found the voltage gets high enough apparently due to SWR that it
arcs and that can be a problem.
> 73,
>
> Jim Brown K9YC
>
>
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|