With an online name like that, I assume you won't mind me "nitpiking"...
1) First off, I hope you didn't already buy this Belden 9913?? As this is one of the worst choices for your application!!
Originally Posted by nitpik
Thanks to all for the input - I went with Belden 9913 cable from rfc.
Belden 9913F7 is useable/acceptable....BUT....
But, actual Belden 9913 is NOT a good choice at all!!!
Please note that 9913 is a air-dielectric / semi-solid-air-dielectric, cable with a solid copper center-conductor....
And, as such, it is EXTREMELY susceptible to being rendered completely useless if any moisture at all seeps into the cable!!! (FYI, I used Belden 9913 starting back in the early 1980's....for a single
, straight run up a tower for UHF ham radio
....and until a lightning
strike about 9 years ago, was still working fine....BUT, but I know exactly what this cable can do, can't do, and how to properly install it...and I would NEVER use this cable on-board!!!)
2) Secondarily, while a larger solid center conductor DOES reduce cable losses, this type of cable is a REAL pain in the a** to work with, and extremely difficult to install in tight spaces!!!
3) Thirdly, you will most likely notice a difference in reduced cable loss going from your old cable to any new cable (even to a new run of the same RG-58!).....and WILL notice a difference in reduced cable loss by going from your old RG-58 to even RG-8x (reduction in loss of 1.5db), and an even larger difference going to RG-213, or LMR-240 (a reduction in loss of 3db)....
Although, the actual differences you see, in real world use, (if you actually see any), will most likely be due to the "new" cable and connectors, rather than because of the specified "loss" of the cable...
And, please understand that while reducing cable losses is a good thing, there is a point where you go way over-board into the area of "overkill"....and this is especially true with vhf
FM systems, and absolutely true with 99.9% of our Marine
VHF-FM systems, where most of our comms are using "line-of-sight"....
4) So, there is really little need to obsess over squeezing out every last 1/10 of a db from your system....
Originally Posted by nitpik
I want to upgrade my old, decrepit RG58, but as soon as I go beyond RG8X it seems even the big names like Times Microwave use untinned wire for the center conductor. Is this not a problem as long as I use good installation
Also, Joel at the RFC Connection is recommending solid center wire, claiming it has 15% better attenuation than stranded.
So, I am looking at LMR240 or LMR400, both with untinned, solid center conductor.
Is there a good brand out there that offer a stranded and tinned center conductor? (most have tinned shield)
What say you, O wise ones?
I do not know Joel.....but if I can politely write that while he is telling you the truth that a larger center conductor, combined with a higher velocity-factor dielectric, does reduce the cable's loss (compared to other similarly-sized cables), but his recommendation of a solid-center conductor cable for your application is seriously flawed (bad advice)...and his recommendation of an "semi-air-spaced dielectric" cable is VERY BAD advice for you!!!
Please do NOT use regular Belden 9913....this is a VERY bad choice!!
(although Belden 9913F7, is a good cable....and will work well, it is overkill...)
5) Chip (SoonerSailor) and BraiF, both gave you good advice / recommendations....and that's why I didn't post earlier....(not much to add to their recommendations...)
But, now that I see you are ordering 9913, I thought I better post some helpful, expert advice....
a) Use a name brand RG-213, or if you have limited space to run the larger cable use LMR-240UF (note the "UF"....it means "Ultra Flexible"..)
And, if you really want overkill, then use LMR-400UF....(again, note the "UF"...)
b) Read over these recent threads, where you'll get all the info you'll need to understand what cable to use and why...
AIS Antenna on Spreaders
VHF and AIS Radiowave Propagation and VHF and AIS Radio Range
Connecting VHF, AIS, GPS - NMEA0183 and NMEA2000
Top of mast, or RG213.... cant do both!
I hope this helps....and if "Joel" wishes to discuss this with me directly, I would be more than happy to give him a phone
call and explain your application / needs, and try
to explain to him why vhf
FM line-of-sight comms, with elevated verticals, etc. there is little need to go to extremes trying to reduce cable losses....