John:
I'll do some checking for sure, and if you can tell me the brand and model
number of the one you have, I'll check that specifically.
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 11:54 PM
To: [log in to unmask]
Subject: Re: More on interfacing Cobra Ultralite Senior with Tentec 238A
manual tuner
I still think you could get a more reasonably priced balun if you looked
just check reviews out there there is some real junk on the market. The 1:1
one I have on a wire that was just put up NVIS here I'm sure has a 4:1
counterpart and was about half that price new, I got it used for a price I
couldn't pass up but it looks like great quality and has great reviews.
----- Original Message -----
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, December 24, 2012 4:36 PM
Subject: Re: More on interfacing Cobra Ultralite Senior with Tentec 238A
manual tuner
> 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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