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Author Topic: Feed Line and Window Pass-Through Recommendations for Apartment HF Station?  (Read 545 times)
KD6DXA
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Posts: 73


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« on: July 13, 2019, 06:27:43 PM »

I am putting together a new apartment-dwelling HF station and could use some recommendations on feed lines and window pass-throughs. Our apartment has fairly modern double-pane windows, and I was thinking about trying the Comet CTC-50M coax window pass-through?

https://www.universal-radio.com/catalog/antsup/2750.html

Does anyone have any experience with these window pass-throughs? If so, will they work well on modern windows that seal fairly tightly? If not, I’m all ears for other feed line and/or pass-through options.

Thanks!

Zachary, KD6DXA
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Zachary Fruhling, KD6DXA
https://www.zacharyfruhling.com/
W9IQ
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« Reply #1 on: July 14, 2019, 03:31:20 AM »

I used the same type of device, but a different brand, in my house in Germany. I could observe the impedance bump with a TDR but it made no practical difference in SWR. It worked well for me 80 through 10 meters with 100 watts.

My windows and casements were wooden. I would be a little more skeptical if you have aluminum in either.

- Glenn W9IQ
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- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
F8WBD
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« Reply #2 on: July 15, 2019, 01:42:06 PM »

I've used the same Comet. Avoid opening and closing the window frequently. In fact, not at all once installed correctly. 100 watts max and  best to keep it even less.
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K7FSU
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« Reply #3 on: July 27, 2019, 01:34:20 PM »

Used two of the Comets for several years.  Work just fine, and I agree with the install & leave them alone suggestion.  Used 100 watts as well.  No problem.
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KD6DXA
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« Reply #4 on: August 01, 2019, 08:25:44 PM »

Used two of the Comets for several years.  Work just fine, and I agree with the install & leave them alone suggestion.  Used 100 watts as well.  No problem.

My only concern is that we tend to open and close the windows quite frequently (and with frequency—pardon the pun). And the windows are fairly modern double-pane windows, so it will already be a tight squeeze, even for a pass-through as thin as the Comet pass-through. I'll be raising the antenna in the next couple of weeks. Worst-case I'll just run the coax through the open window when I want to operate, but fingers crossed on the Comet.

Zachary, KD6DXA
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Zachary Fruhling, KD6DXA
https://www.zacharyfruhling.com/
N8FVJ
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« Reply #5 on: August 02, 2019, 07:52:44 AM »

MFJ makes a wood insert that you cut to size (width) at bottom of window. It has multiple coax connectors.
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