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Running Feed-line Location Question

Unidener

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I want to "sneak" my antenna feed-line around the HVAC wall entrances (brick)(LMR-400).

Are there any suggestions as to how far away or any other concerns?

Thanks to all for all of your help!
 

mmckenna

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Doesn't matter how close it is.
Just make sure you don't bend it too tight, that can damage the cable. Check the Times-Microwave specs for LMR-400, specifically the "minimum bend radius".

If the A/C unit vibrates, make sure it's not going to damage the outer jacket on a sharp edge. Water in the coax is a bad thing.
 

Unidener

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Doesn't matter how close it is.
Just make sure you don't bend it too tight, that can damage the cable. Check the Times-Microwave specs for LMR-400, specifically the "minimum bend radius".

If the A/C unit vibrates, make sure it's not going to damage the outer jacket on a sharp edge. Water in the coax is a bad thing.
Thanks as always for the reply!

I had to ask that question because in the old days of Token Ring and Ethernet cable there were issues running near power lines and florescent lighting. The 400 will be about a foot away going through the wall but your answer just made me think of another route. I'm going to run it under my porch then through the brick wall into the crawlspace.....

The specs say Bend Radius: installation is 1" but the Bend Radius: repeated is 4"(a little confused about the 2 different specs)......this will be pretty much a no bend until it goes in the wall and that's why I asked about 90 degree connectors....I think I can stay well above the 1" since I will be running it through my crawlspace, I will be able to have large bends....

Glad I asked this question so I will be more aware of what to avoid and any bending will be very gradual...

The antenna will be here Saturday so I know my project for the weekend and am now better informed about the installation.

Thanks for the reply, learning more and will try to get everything right the first time (don't want to damage it especially since it's so expensive!).

Have a great weekend.....unless I run into another question :cautious:
 

mmckenna

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The specs say Bend Radius: installation is 1" but the Bend Radius: repeated is 4"(a little confused about the 2 different specs)......this will be pretty much a no bend until it goes in the wall and that's why I asked about 90 degree connectors....I think I can stay well above the 1" since I will be running it through my crawlspace, I will be able to have large bends....

When installing the cable, it can be bent as small as 1", but not held that way. When permanently installed, you want the bend radius to be no more than 4". Kind of hard to get that inside a normal residential home wall when making the transition to a wall plate.

Issue is the center conductor migrating in the center dielectric if bent too sharp and held there. Best case, that throws the impedance off. Worst case, you get a direct short between center conductor and outer shield.

Original token ring/CAT5 type cables were not shielded, so you wanted to avoid things like fluorescent lights. Coax outer shield will help reduce that issue. None the less, keeping away form electronic noisemakers is a good idea.
 

Unidener

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"When installing the cable, it can be bent as small as 1", but not held that way. When permanently installed, you want the bend radius to be no more than 4". Kind of hard to get that inside a normal residential home wall when making the transition to a wall plate."

But it's still OK to use a PL-259 right angle (90 degree) to connect it to the wall-plate, correct?
 

mmckenna

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But it's still OK to use a PL-259 right angle (90 degree) to connect it to the wall-plate, correct?

Yes, it's OK. But make sure you get a good one.
All connectors/adapters induce a bit of additional loss, so you want to avoid using them if you can. But residential installs sometimes require compromises.

Other option:
If the wall plate is close to where your radio is, just use a piece of RG-58 to extend the LMR-400 to your radio. You don't want to connect LMR-400 directly to the radio, as it'll put a lot of strain on the antenna connector. A short whip of RG-58 isn't going to have much noticeable loss, and it'll make life easier.
 
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