Thanks, John.

Just for the record, I wrote to Joe (K1JEK), the maker of the Cobra, and he
said that it probably would be best to go with the Balun  Designs balun,
since using the tuner without a balun outside of the shack might introduce
the potential for more stray RF in the shack.

Now, maybe he just wants to sell more baluns, but his argument does make
some intuitive sense.  I was just trying to see if I could save myself $80,
by not getting the Balun Designs balun.

Tom Behler: KB8TYJ


-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of John Miller
Sent: Monday, December 24, 2012 1:59 PM
To: [log in to unmask]
Subject: Re: More on interfacing Cobra Ultralite Senior with Tentec 238A
manual tuner

The wing nuts are for a balun, the one thing to make sure of, is for the
cobra antenna, you want a 4:1 balun, as long as that's a 4:1, not a 1:1
balun in there, you should be in great shape. I wouldn't think there would
be any more or less RF one way as the other. I wouldn't worry about the
power rating either, if the tuner can handle 2K the balun should be good for
close to that and no way your amp should hurt it.
----- Original Message -----
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, December 24, 2012 1:16 PM
Subject: More on interfacing Cobra Ultralite Senior with Tentec 238A manual
tuner


> Hi, again all.
>
> My apologies:
>
> I should have given more complete info in my last post.
>
> First of all, the Tentec 238A is rated for up to 2000 watts, so I 
> would think  I'd be ok in that regard, since the most my Ameritron 
> AL811H puts out is about 600 watts.
>
> Second, here's a more complete set of instructions about antenna
> connections:
>
> For balanced feedline systems, adding a jumper from SINGLE WIRE to one 
> of the BALANCED LINE terminals as shown on the rear panel is required. 
> A tin-plated steel jumper for this purpose has been provided.
> It is attached to one wing nut connector on the back; if balanced line 
> will be used, attach the other side of the jumper to the other wing 
> nut. Then connect the feedline to the two BALANCED LINE terminals.
> ANT position 4 can be coax, single wire, or balanced line. ANT 1, ANT 
> 2, ANT 3 must be coax only.
> Please note that 238C does NOT allow for the connection of either 
> coax-fed and balanced line or single wire antennas to the ANT 4 
> connection at the same time. There is no switchable configuration for 
> ANT 4 - any antennas connected to these jacks will be in use. If you 
> have a coax fed antenna and a balanced line or single wire antenna 
> connected to ANT 4 at the same time, both of these antennas will be in 
> use when ANT 4 is selected from the front panel."
>
> In light of this new info, would I still be ok without the Balun 
> Designs balun, as far as anyone can tell?
>
> On the negative side, would using just the tuner and the antenna 
> without the additional Balun Designs balun possibly lead to more stray 
> RF in the shack?
>
> 73 from Tom Behler: KB8TYJ
>