Ok, fair enough. F7 is different than the original 9913, and that is an important distinction. Bob's comment (which I quoted) was about the original 9913. The F7 variety shouldn't be as susceptible to water, but then it also isn't quite as good as (dry) 9913 or LMR-400.
But to the original question, which included a point about covering microwave bands, none of the RG-8-ish type cables are appropriate for more than a few feet on those bands. Except for the short flexible portion around the rotor, LMR-600 or hardline is needed, or mount a weather proof transverter up on the tower to shorten the microwave portion of the feed. I still use a higher-grade cable for UHF, as my run is over 60' from rig to antenna. Below that, it's more a matter of availability and cost. Just don't go with the really skinny stuff (RG-58 or RG-8X), because of both higher loss and lower power handling capability.
A good comparison table I found is here: https://mapleleafcom.com/PDFs_Downloads/CoaxLossChart.pdf
Greg KO6TH
Norm n3ykf wrote:
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@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@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:
IF patch between equipment (male-male BNC's)2m feedline (N-connectors) (<50')70cm feedline (N-connectors) (<50')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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Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb