[Elecraft] OT: Checking coax jumpers before soldering

[bill conkling]

I have used 50 ohm BNC 'terminators' with adapter to verify coax.  Start with terminator on analyzer, should be flat VSWR over wide band.  When at other end of coax should be same.

...bill nr4c


Sent from my Verizon Wireless 4G LTE DROID

Joel Black <w4jbb at charter.net> wrote:

>Frank,
>
>I use an Anritsu SiteMaster at work to detect such things with hardline 
>and coax. It comes with a 50 ohm load for testing feedline. I don't know 
>how you'd set up an amateur-style antenna analyzer to do such. When I'm 
>looking for faults, I specifically set it to " Return Loss - DTF 
>(Distance To Fault)."
>
>If you have a station dummy load, you could use that. The one I built 
>from Oak Hills Research is a little bulky, but would do the trick I think.
>
>73,
>Joel - W4JBB
>
>On 11/12/13, 12:41 AM, Frank Precissi wrote:
>> This is along the same lines of the PL-259 connector soldering.  Although
>> off topic for this group some collective wisdom might help someone other
>> than myself in the future.
>>
>> How can you check to see if coax is still "good"?  Sure we can test for
>> shorts with a multimeter, but if the coax has been crushed and the
>> dielectric has been deformed, obviously things will be wonky when we put RF
>> through it.
>>
>> Is it possible to short one connector with a 50ohm resistor, then on the
>> other end attaching an antenna analyzer and sweep the ham bands looking for
>> obvious SWR changes?  I mean to me (read: newbie when it comes to this) it
>> should show a flat 50ohms across the bands, correct?
>>
>> I have a few spools of 100' RG8X that I'm sure have been slammed in a
>> sliding glass door more than once.  No sign of any trauma on the jacket or
>> shorts, but I cant tell if the dielectric has been mangled inside.  I
>> really don't want to blindly ditch perfectly good coax.
>>
>> Any tricks of the trade when it comes to this?
>>
>> 73
>>
>> Frank
>> KG6EYC
>>
>>
>
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