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Author Topic: TW-2010 vs MFJ-1786  (Read 7313 times)
WX7G
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Posts: 6131




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« Reply #15 on: September 16, 2013, 02:21:35 AM »

The question of the recommended 65' of coax has been asked in several eham posts and users report using shorter lengths with no problems.

It's not clear whether the TW2010 loading coil box, or "middle section" contains a balun or not. If it does not have a balun but the side of the antenna connected to the coaxial cable shield presents a lower impedance than the shield, most of the antenna current will take the path of the antenna and not the shield.
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JAHAM2BE
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Posts: 277


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« Reply #16 on: September 16, 2013, 02:33:47 AM »

It's not clear whether the TW2010 loading coil box, or "middle section" contains a balun or not.

Unless it's hidden on the back side of the board, there seems to be no balun in the photo of the loading coil box on p. 26 of the following PDF: http://www.twantennas.com/pdf/24-TWReviewWestSept.pdf

One item of note in the above PDF is that the control cable (to control the coil switching) is apparently 65 feet long. That might have something to do with the recommendation of a 65-foot long coaxial cable feedline, though I can't imagine exactly what; perhaps the coax and the control cable can interact in undesired ways.
« Last Edit: September 16, 2013, 02:39:04 AM by JAHAM2BE » Logged

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