My feedline actually consists of more parts:
1) from radio to wall mounted switch - 8 mtrs of RG400
2) from the switch to 80m sloped dipole - 10 mtrs of RG400, a W2DU style
choke balun is an integral part
3) from the switch to HF multiband vertical (roof mounted, the metal
roof is misused as a grounding system) - 15 mtrs H500 + 1 m RG400 as
another W2DU style choke balun.
The beads used for the W2DU style balun are Laird LFB095051-000. This
stuff has a crossover frequency R=X slightly above 1 MHz.
73,
Martin, OK1RR
Dne 04. 01. 23 v 6:19 Jim Brown napsal(a):
On 1/3/2023 8:29 PM, Martin Kratoska wrote:
the feedline is RG400.
That's very good coax for very special purposes like common mode
chokes and patch cables in the shack. But it's but also very lossy --
equivalent of RG58 -- so I using much larger stuffto the antenna. My
wire antennas are fed with RG8 or RG11 size coax, and 7/8-in hard line
for the 350 ft run to the top of my tower.
73, Jim K9YC
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