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adding coax

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cmed325

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i ran appx 70 ft of lmr 400,now i find i may be short 10 ft or so,should i just add lmr 400 with a barrel connector or will any coax do for that length? looking for suggestions.
 

snowman3725

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You should be able to find lmr 400 jumper cables in that length. You have used lmr 400 this far, why not finish it off?
 

LtDoc

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It really shouldn't make a drastic difference by using an extension. There will be some differences, sure, but I sort of doubt if it would be worth buying a new feed line.
- 'Doc
 

mpddigital

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Depending on your band you can use LMR-400 or 240. To join your cables do NOT use PL-259/SO-239. Us an impedance matched connector such as an N or TNC that is more waterproof and add additional weather proofing. Better connection and much less loss.
 

n5ims

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Probably would be best to have the jumper at the radio end for several reasons. First, it's indoors (most likely) so weatherproofing won't be an issue. Second, since it's LMR-400 and quite stiff, a short jumper is probably best anyway to reduce the strain on the radio's antenna connection.

While it may be best to use a specialized connector for the joint (like a direct mating connector to what's already on the coax). Best case is your LMR-400 already has an male "N" connector and then you can order your jumper with the female "N", but if it's already got a PL-259 and your jumper does as well, just use a standard barrell connector and call it a day. If the extra .25 dB is that important, you need to run a new feed with the correct length and use something better than LMR-400 anyway.
 
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