On 8/4/2011 3:47 PM, Dan Hearn wrote:
> The baluns(line chokes) are available from DX Engineering or BalunDesigns
> mounted in weatherproof boxes. I have measured both and they are very good.
> They are very easy to build if you want to go that route and the cores can
> be purchased from Mouser who had no minimum order the last time I bought
> cores.
There are price breaks though. At a 100 they are quite a bit less, but
at $6 or $7 each it can be difficult to afford to save that much.
Last time this came up some on had a much better price than Mouser, but
I've forgotten who.
The DX engineering current baluns are expensive but they are effective
and well built.
73
Roger (K8RI)
>
> 73, Dan, N5AR
>
> On Thu, Aug 4, 2011 at 12:11 PM, Jim Lux<jimlux@earthlink.net> wrote:
>
>> On 8/4/11 10:58 AM, larryjspammenot@teleport.com wrote:
>>> Does anyone actually offer these baluns for sale as already-built units,
>> or as a complete kit, without having to go to each individual manufacturer
>> and order just the pieces?
>>>
>>
>> what kit? You buy a batch of 2.4" toroids in Fair-Rite #31 mix. Wind
>> your coax through it 4 or 5 times. Done..
>>
>> If you want more choking effectiveness, use multiple toroids. Either
>> stack them or do it in series (5 turns through the first one, then 5
>> turns through the next one, etc.)
>>
>> I have to say, I've not noticed any practical performance difference
>> between stacking 4 and winding on the stack vs doing them in a string.
>> The latter is a bit more unwieldy to handle. It also has better
>> performance at high frequencies (at least on the VNA... I haven't
>> noticed any practical difference)..
>>
>> These days... I wind some turns on one core up at the antenna, and then
>> do the same near the rig.
>>
>> You could also order a bunch of 0.5" ID beads in the same mix, and
>> string them on the coax, but that requires removing connectors, etc.
>>
>>
>>
>> Read Jim Brown's tutorial..
>>
>>
>>
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