[Elecraft] BL2 Balun Heating

[Paul at N4LCD.com]

Geoffrey Mackenzie-Kennedy wrote:
>Paul,
>
>When using a SGC-230 to feed two wire open wire line I understand 
>that one side of the feeder is connected to the SGC-230's ground terminal.

That is correct.
It's the lower wire of the window line in this picture:
www.N4LCD.com/SGC-230_700x525.jpg


>Have you found any RF appearing on the DC supply cable to the tuner, 
>or on the outside of the 50 ohm coax between the tuner and the 
>shack, which requires choking?

I don't know if it was necessary, but I put a W2DU choke from The 
Wireman at the K3.

I haven't used it without the W2DU choke.

The ground terminal on the SGC-230 is not grounded.

The K3 is grounded.

No choke on the DC supply / control cable to the SGC-230.  I have 
considered adding a few clamp on's.

The rig is on the second floor, and the SGC-230 is mounted on the 
window sill just outside, on the second floor.

I have the K3 set for 3 Watts for tuning.

I normally have the K3 set for 5 Watts for CW or 10 Watts for SSB.

I've never detected any RF problems.  However I'm using a 10 Watt 
rig.  YMMV with a 100 Watt K3.

BTW, my intent is to ultimately have an 80 meter horizontal loop 
connected to the SGC-230, with no feed line.

Paul


>My reason for asking is that I am looking for another remote tuner 
>located outside for use with open wire feeder which does not cost a 
>fortune. The other remote tuner that I have is a classic link 
>coupled ATU, but it is already in use.
>
>73,
>Geoff
>GM4ESD
>
>
>You wrote:
>
>>I have the same antenna, the Cobra Ultralite with window line, and
>>simply connect the two ends of the window line to an SGC-230
>>automatic tuner http://www.sgcworld.com/230ProductPage.html which is
>>mounted outside.  I have the tune power of the K3 set to 3 Watts.  No
>>balun required.  Works great, 80 through 10.