set the inductor to full scale? full clockwise reading 30? I just looked at the
238C pix…no wonder could not get a match….the 238C inductor scale is totally
reversed from the A and B series!
On Jul 26, 2013, at 6:31 PM, "Bob McGraw - K4TAX" <RMcGraw@Blomand.net> wrote:
> Basically anything in line between the output of the radio and the input to
> the tuner can be suspect. And I mean anything. Coax jumpers, SWR/Power
> meters, LP filters, various switches, power amps just to name a few.
>
> The new breed of connectors we get today look really good. Looks is the best
> description of their quality. Electrically they are fair to poor. Even for
> the best of them, I always practice snugging them with a pair of 4" Channel
> Lock pliers. Finger tight is not good enough.
>
> I seem to recall that you tried another tuner stating that it worked. Were
> you using the exact same configuration, meaning jumpers and every thing else.
> If not then the comparison was not accurate.
>
> As to the 238 there is a specific or preferred method for the usage.
>
> (a) Set the capacitor to a value of 2.
> (b) Set the inductor to a full scale (fully clockwise) position
> (c) Apply a small amount of power, then switch the BYPASS switch to both
> sides and observe the position giving the lower SWR value.
> (d) Alternately adjust the Capacitor and Inductor for lowest reading.
> (e) If the capacitor shows the lowest value when near 0, then turn S1 to the
> other side
> (f) If the capacitor shows the lowest value near 10, then turn S1 to the next
> higher value
>
> Once you obtain the lowest SWR value make a note of the values for the
> frequency and proceed to the next frequency.
>
> You could have certain conditions, based on antenna and feedline length, that
> can not be matched with the tuner. In this case add a few feet of feedline
> and proceed with the matching procedure.
>
> 73
> Bob, K4TAX
>
>
>
>
> ----- Original Message ----- From: "denton sprague" <denton@oregontrail.net>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Friday, July 26, 2013 10:43 AM
> Subject: Re: [TenTec] TT 238C will not tune
>
>
> well an update…TT tested the 238C at full legal limit and it got a clean bill
> of health…so its something on my end. I will try it again when it gets back,
> with new cables and see what happens.
> On Jul 8, 2013, at 6:27 AM, denton sprague <denton@oregontrail.net> wrote:
>
>> called TT…off it goes to the hospital...
>> On Jul 6, 2013, at 10:27 AM, denton sprague <denton@oregontrail.net> wrote:
>>
>>> Hi all…
>>> I recently purchased a used TT 238C tuner from TT and other than
>>> functioning correctly in the bandpass position, it will not tune my antenna
>>> system at all!
>>> I pulled the cover and can find nothing amiss…
>>> It acts like the roller inductor is not in the system and the padding caps
>>> on the high z/low z switch are all not correct value.
>>> Visually it all looks pretty much like new on the inside.
>>> Will call Stan at TT early monday am and see what he says…good thing they
>>> warrant their equipment.
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|