[amsat-bb] Exciting Coax

[Bob- W7LRD]

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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