OK.....Lets talk cable....
1. You can't use 1 1/4 or 1 5/8 heliax at 5 Ghz anything. Can't use
7/8 heliax there either. You can....but it won't work right....
2. You can use 5/8 heliax at 5.8 Ghz and below.
3. LMR900 is the largest Times cable you can use at 5.8Ghz.
4. You can use 1 1/4 Heliax at 2.4 without issue. 2.5 Ghz is the top
limit for 1 5/8 Heliax.
5. 1 1/4" heliax and above needs REAL mounting hardware to secure it to
the tower or structure. This means hanger brackets, hoisting grips,
and ground kits made for heliax. Don't think you can tie a rope to it
and pull it up or use tie wraps to secure it. It won't hold more than
100 feet or so vertically.
6. Heliax also means real connectors.
7. You can't lift several hundreds of feet of large heliax by hand (nor
should you). You need a capstan/winch to do this right. 1 5/8 is about 1
lb per foot.
8. Connector attachment is more critical at 5 Ghz on heliax. We have
seen connectors sweep like crap when it was thought they were installed
correctly.
9. Do not use "USED" connectors. Always use new and follow the
directions for attachment.
10. Personally I am not an LMR900 fan. We use 5/8 heliax at this point.
11. I am an LMR600 big fan. We use a poopload of this cable every month.
12. I use LMR400 for jumpers mostly
13. Losses are:
1 5/8 2.4 Ghz. 1.4dB 5Ghz. Do Not Use
1 1/4 2.4 Ghz. 1.6dB 5Ghz Do Not Use
7/8 2.4 Ghz. 2.3dB 5Ghz Do Not Use
5/8 2.4 Ghz. 2.0dB 5Ghz. 4.3 dB
1/2 2.4 Ghz 3.9db 5GHz. 6.3dB
LMR Cable loss is found on the Times web site.
14. You can't make quick right angle turns with 1 1/4" and above.
15. Heliax is very unforgiving if you kink it or fold it in half. If
you fold it ya gotta cut it.
Installed properly heliax will be the better choice for low loss
especially on long runs (200'+)
Bob
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