[K3CAL] Spool of hardline in Noell garage

[Chuck Shefflette]

Monica,

I’m sure the hardline is good. If I remember correctly it is Andrew LDF4-50B. If it is, and we are really interested in testing it, I have connectors and we could put a connector on one end and have a look at it with a TDR/VNA.

Chuck
AA3CS
------
“There are 10 types of people in this world: those who understand binary and those who don't.” -- Unknown

> On 17 Oct 2018, at 12:51, Monica <KC3DAS at comcast.net> wrote:
> 
> Shawn
> 
> Ah!!  Thank you for your excellent explanation.
> 
> I'm also thanking Bill for his input yesterday.
> 
> I promise, therefore, not to use the hardline for deer fencing!!!  All my plants have been eaten anyway, so I don't need to clean out my gardens!
> 
> Thanks,
> 
>  Monica
> 
> KC3DAS
> 
> 
> 
> On 10/17/2018 10:18 AM, Shawn Donley wrote:
>> Monica,
>> 
>> The hardline is most likely good.  The reason the manufacturer recommends storing on the curved side is that the weight of the hardline can deform the line at the bottom of the spool, particularly in transit.  But with a partial spool, this is less likely.  Plus the Andrew hardline is more robust that some of the other products.  In any case, it's easy to measure the impedance and loss to make sure once a proper connector is installed on one end.
>> 
>> It's possible we may need this hardline to replace the 7/8 hardline (either in part or whole) at Prince Frederick.  We know that the 440 antenna system there is bad but until the antenna is disconnected from the hardline, it's difficult to measure the condition of the 7/8" line.  Prior time domain reflectometry measurements suggest that the 7/8" line is compromised in some fashion.  But there are various stories regarding how the 7/8 was installed originally and if the entire 250 ft length was used or if it was cut and a new connector put on it up on the tower side.  So we're not 100% sure if the "bump" seen in the TDR measurements is on the feedline or at the antenna.
>> 
>> IF we don't need the 1/2 inch at Prince Frederick, we'll still need it for the Mt Hope and Barstow shelters if and when the county ever purchases the new AUXCOMM equipment or moves out repeater to the new tower.
>> 
>> Shawn
>> 
>> 
>>> On October 16, 2018 at 1:28 PM Monica <KC3DAS at comcast.net> wrote:
>>> 
>>> 
>>> 
>>> Per the discussion at the October CARA meeting, some of you were
>>> wondering whether the hardline that is stored in our garage was still
>>> any good.  The spool had previously been stored for quite a while at
>>> Mount Hope on its flat end rather than on the curve of the spool as
>>> recommended by the manufacturer.
>>> 
>>> What I'd like to know is whether we can test the hardline to see if it's
>>> still good or whether it's permanently damaged.  If it's not good, I'd
>>> like to get it out of our garage.  If it's still in good shape, we will
>>> keep it where it is.  Or if it's good for any other purpose, we would
>>> continue to store it.
>>> 
>>> Thoughts??
>>> 
>>> Thanks,
>>> 
>>> Monica
>>> 
>>> KC3DAS
>>> 
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