How much power can a BNC handle? rg58 coax, 1.3:1 swr,
say, 54mhz, indoor connection. I'm using a BNC jumper between
my amp and my antenna switch. I use BNC so I can d/c quickly
when a t-storm comes in the area.

--
73's de Ken KG0WX - Kadiddlehopper #11808,
Flying Pigs #-1055, Grid EM17io, FT-857D,
Elecraft XG2, 4SQRP Tenna Dipper, Heath GD-1B

I guess this is a case where one doesn't ask....he just does it!
I have a 20 Meter Hi-Q Halo-type loop (6' dia) hanging from a tree
limb about 40' high. I needed lighter weight so I used RG-58 about
75' long....well-matched at the antenna for very little SWR.
I have been using this with 1 Kw SSB peak for about 10 years with
no problems...this includes reasonably long tune-up with full carrier.

On Thu, 22 Jun 2006 16:16:57 +0000 (UTC), (Gene
Gardner) wrote:



I guess this is a case where one doesn't ask....he just does it!
I have a 20 Meter Hi-Q Halo-type loop (6' dia) hanging from a tree
limb about 40' high. I needed lighter weight so I used RG-58 about
75' long....well-matched at the antenna for very little SWR.
I have been using this with 1 Kw SSB peak for about 10 years with
no problems...this includes reasonably long tune-up with full carrier.

So you are dissipating about 4W per foot of cable with key down 1kW
CW. Average power of voice with compression is about 13dB lower, or
about 200mW per foot.

Explains why it has worked ok, doesn't it!

If you dig into the numbers, about 25%+ of your transmit power is lost
in the line losses, which is a compromise you acceptaed for the
lighter weight line you needed.

Owen
--

Ken Bessler wrote:
How much power can a BNC handle? rg58 coax, 1.3:1 swr,
say, 54mhz, indoor connection. I'm using a BNC jumper between
my amp and my antenna switch. I use BNC so I can d/c quickly
when a t-storm comes in the area.


Ken,

The connector itself is dimensioned almost the same as a type N
connector.

The limiting factor assuming a good quality properly installed BNC
connector is the cable, not the connector.

If you use a good high temperature cable in a dry room-temperature
environment 500 watts extended time with carrier is a reasonable amount
of power. That power increases quite a bit for shorter duty cycles.

We used BNC's on a 3500 watt 30 uS RF pulse generator at 40.68MHz, and
I've used them with CW and SSB with good Teflon cables at 1500 watts on
30 MHz as quick disconnects.

If you carefully exam the BNC you will see it is nearly identical to a
type N in air gap to ground and pin diameter and penetration depth. The
real problem is the cable, not the connector.

73 Tom