-
Wed 5th Dec 2018, 01:17
#1
450ohm ladder and coax
My qth I have a radio room in small cupboard / room with pre existing vent duct to outside.
Depending on route of feed to antenna location I have a run approximately 50m. And a concrete and metal workshop within 3 meters of aerial location on a bank in rear garden
Looking at most coax it performs terriblely in power in watts lost with 6m band and long run & 2db indicated average loss.
So my question is coax out of radio room>9:1 Balun to 450 ohm wire (avoiding resonant lengths of antenna) terminated to 9:1 Balun and short run of coax to aerial.
Looking at if this is a cheaper, less lossy ,method to get coax loses down to aerial.
Looking at 213/LMR 400 or LMR600 in short runs
Thanks
-
Wed 5th Dec 2018, 18:11
#2
For H.F. nothing beats open wire feeder, particularly the lower bands.
V.H.F. and above, you'll need the lowers loss coaxial cable you can find...
-
Thu 6th Dec 2018, 10:10
#3
What did you mean by short runs? Absolutely NOT short runs joined together - as every connector has a small amount of loss. To be honest, 2dB loss is quite workable in real life.
-
Thu 6th Dec 2018, 13:16
#4
yep, figure you would probably have less loss with one long run of good grade coax than with all the connections and baluns in that configuration.
-
Mon 10th Dec 2018, 12:25
#5
Hi Dan31 . After reading your query, and noting the 50 m( approx 163 feet) run to antenna, I would suggest , stay with the 450 ohms feeder line.! and use an antenna tuner , although you do not mention , just what antenna you will be using, straight dipole? multi -band non- resonant top ? etc ! The main small problem , with 450/300/ feeders is the wet weather effect, but personally speaking , I don't find that a great problem.. My own 450 ohm feeder comes thru' the roof space (attic) The small workshop you mention, would obviously be the ideal
Tags for this Thread
Posting Permissions
- You may not post new threads
- You may not post replies
- You may not post attachments
- You may not edit your posts
-
Forum Rules
Bookmarks