[amsat-bb] Exciting Coax

[Norm n3ykf]

9913 is not 9913F7

Google is your friend, or perhaps if one is lazy, not.

Norm n3ykf

On Tue, Jan 23, 2018 at 12:33 PM, Greg D <ko6th.greg at gmail.com> wrote:
> I've got hardline for my 60' runs on 70cm, and 1.2 ghz.  Really works a
> LOT better than 9913, especially with the water problems.  Besides at
> the connectors, the local squirrel population likes to gnaw at stuff,
> and all it takes is one small chew to ruin the entire run.  With
> "regular" (solid innards) coax, the wound can be taped over with
> electrical tape, since they don't seem to like the braid.  Even the
> smallest nick in 9913 will eventually be fatal.
>
> Greg  KO6TH
>
>
> Bob- W7LRD wrote:
>> For 2 & 70cm I use LMR400.  LMR is better (in my opinion), in that it's more flexable, 9913 can get water inside.  Unless coax connectors are super sealed.
>> 73 Bob W7LRD
>>
>>> On January 22, 2018 at 6:03 PM anderson58625 <anderson58625 at gmail.com> wrote:
>>>
>>>
>>> Reading the subject line, I may have somehow mixed sarcasm with a potential
>>> pun (eye of the beholder!) <grin>.  Sorry for that.
>>>
>>>
>>>
>>> I seek to avoid investing in a set of cable producing hardware (or assembled
>>> cables) which I will regret later.  I am hoping to get some guidance
>>> regarding coax for:
>>>
>>> 1)      IF patch between equipment (male-male BNC's)
>>>
>>> 2)      2m feedline (N-connectors) (<50')
>>>
>>> 3)      70cm feedline (N-connectors) (<50')
>>>
>>> 4)       A later potential for feedline carrying microwave frequencies
>>> (>1GHz)
>>>
>>>
>>>
>>> The frequency & loss-rate charts for coax are informative, but I'm not sure
>>> I'm seeing which connectors will fit what cable brand/types.  With the
>>> variables of loss, dimensions, flexibility, and potential proprietary
>>> crimping systems, etc., I don't have enough experience or information to
>>> confidently make an online materials order.  Things were much easier down
>>> here with just HF frequencies, RG-213, and good quality (weather protected)
>>> PL-259's! <grin>
>>>
>>>
>>>
>>> For IF patch cables, I figure these are conveying HF so the cable type/loss
>>> at 1-3' isn't very important.  But, there is also shielding:  A
>>> consideration?
>>>
>>> .       Any thoughts on IF cables?
>>>
>>> .       Plus, I've never attached a BNC to a cable.  Easy?  Avoid it?
>>>
>>> .       Plan on a new crimper/die?
>>>
>>> .       Or, if premade would be cheaper (just a few IF patch cables), any
>>> quality sources to recommend?
>>>
>>>
>>>
>>> For the 2m & 70cm feedlines, I know flexibility may be a consideration on
>>> rotating/elevating masts.  Of course, I'm sure a rigid feedline may be
>>> superior elsewhere, but I am not at that point yet.  Still, advice on that
>>> subject is gratefully appreciated.  I need to provide good questions to hope
>>> for good answers, so what feedline you would recommend for:
>>>
>>> .       Reasonable flexibility/portability
>>>
>>> .       2m-23cm
>>>
>>> .       Modest power
>>>
>>> .       <50'
>>>
>>> .       For use with n-connectors
>>>
>>>
>>>
>>> The benefit of you knowledge and experience is much appreciated.
>>>
>>>
>>>
>>> 73
>>>
>>>
>>>
>>> Mark W9AT
>>>
>>>
>>>
>>>
>>>
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>> _______________________________________________
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>
> _______________________________________________
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> to all interested persons worldwide without requiring membership. Opinions expressed
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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