Re: [WISPA] Little installation gotchas. SMA Connectors

Thu, 08 Feb 2007 07:29:37 -0800

Hi,

I can tell you that Trango is going to an N connector on their new series of radios (6-12 months out). However, they are not going to change anything with the existing radios.

Travis
Microserv

Ralph wrote: 
Hi Travis- I understand (and agree with) your point-
But 
Sometimes the installation calls for a longer one. I have seen 4-10 ft ones
for various reasons.
Sometimes the specification for the job calls for that size cable because
the owner has it in his head that there may be .025 dB less of loss.
Mind you- I am NOT saying not to use a smallish cable, I'm just about the
flimsiness of the connector Trango chose.
SMAs weren't really designed for use on flexible cables anyway. 



-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On
Behalf Of Travis Johnson
Sent: Thursday, February 08, 2007 10:17 AM
To: WISPA General List
Subject: Re: [WISPA] Little installation gotchas. SMA Connectors

Ralph,

When you are talking a 12" or 18" pigtail, using LMR-195 vs. LMR-400 or even
LMR-600 there is going to be less than .5db difference. Why would you need
such a large cable for just a small jumper cable?

Travis
Microserv

Ralph wrote:
  
Does anyone else have an issue with the tiny little SMA connector that 
Trango and some others use for antenna connections?
I have seen several failures where the mating connector on the antenna 
feed line self destructs due to leverage caused by the cable. Nothing 
kills an installation budget quite as bad as having to do another 
tower climb or even a parts run due to something as silly as this! And 
if you have to go back because of a later failure at this point it is even
    
worse!
  
Good RF sense tells you to use as large of a cable as practical for 
less loss and for compensation for connector loss, but when using 
LMR400 (and I have even seen one WISP use LMR600) for a jumper it is very
    
unstable.
  
I feel that in order to eliminate this very real single point of 
failure, this manufacturer needs to redesign that area.

I don't want to hear that because Trango has either/or dual polarity, 
it provides built in backup redundancy- unless you do every 
installation with a dual pol antenna and have smart enough people to 
know to switch pol when the cheesy little connector fails. <grin>



  
    
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