[amsat-bb] Exciting Coax

anderson58625 anderson58625 at gmail.com
Tue Jan 23 02:03:32 UTC 2018

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


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

.       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.




Mark W9AT



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