[VHFcontesting] Cushcraft 13B2 Match

[Mike Benonis]

Thanks to all who have responded to far.  As best I can tell, the T-match presents a balanced feedpoint impedance in the neighborhood of 200 Ohms (whether it's real or complex I don't know), and so I just need a 4:1 balun which I can make out of some transmission line.  Not sure why Cushcraft sells a fancy box for that but oh well.  Guess I'll just slap on a lambda/2 piece of coax and see if that makes it happy.

I do wish the manufacturers would provide more technical data on their products.  It's really frustrating not to have a theory of operation section, circuit schematic, and/or a Smith chart showing the feedpoint impedance.  It's not exactly rocket science, just a bit of EM field and microwave theory...ah well.

73's and thanks again to all who responded.  Feel free to keep the conversation going!

Mike KI4RIX


On 29 Sep 2010, at 22:44 , R Johnson wrote:

> Hi Mike:
> Sounds like you have most of the "T Match" already from your description.
> 
> Why don't you go to the CC site and look at the 13B2 diagrams to see what you actually need.
> www.cushcraftamateur.com/prodsupport.php
> 
> Then you can go to the customer support page and pick how you want to contact them and
> get prices on the part you need.
> www.cushcraftamateur.com/custsupport.php
> 
> A number of people on this list have done this and have been happy with the reasonable cost
> and fast service.
> 
> Unless you have something against a "T Match", I think this would be the best/fastest solution.
> 
> I'm getting ready to redo my 6M and 2M beams. I'm planning to get the parts from CC.
> 
> 73
> Bob, K1VU
> 
> 
> At 12:28 9/25/2010, Mike Benonis wrote:
>> Does anyone have experience building a custom match for the Cushcraft 13B2 antenna?  I recently got one, but it was missing all hardware and the match (basically, it came with boom and elements only, including the DE with the T-match pieces parts).  I feel like it should not be hard to build the match but I don't know what the balanced feedpoint impedance is supposed to be.
>> 
>> Thanks and 73 de Mike KI4RIX
>> 
>> 
>> 
>> Best regards,
>> 
>> Mike Benonis
>> mike at benonis.net
>> KI4RIX
>> 
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