Agreed, Steve.
It's only another $80, and that might be well worth the price for not having
to worry about stray RF going who knows where.
Thanks to all for helping me think this through.
Tom Behler: KB8TYJ
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Steve Forst
Sent: Monday, December 24, 2012 2:33 PM
To: [log in to unmask]
Subject: Re: More on interfacing Cobra Ultralite Senior with Tentec 238A
manual tuner
Tom,
You can always try it without the other balun and see how it works, but
I think you are looking at RF in the shack and house. Also when
bring in the open wire into the shack, you need to be a lot more careful
in how you route it compared to coax.
Geez, you got that big promotion, spring for the balun and some low loss
coax to connect between balun and tuner.
73, merry Christmas, Steve KW3A
On 12/24/2012 2:27 PM, Tom Behler wrote:
> 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
>>
>
>
>
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