[TenTec] Omni VII antenna tuner specs.

[Ken Brown]

Hi Lee,

Well, I would have called it quantization, or resolution, or minimum
step size. Anyway I know what you mean when you say granularity. However
I think that would make it difficult to get a perfect 1:1 SWR on the
transceiver side, even with the antenna side having a fairly low (like
3:1) SWR. And I would not expect that to limit how big the SWR is that
it can match. Maybe on 6 meters they put another capacitor in series
with the binary switched capacitors, resulting in both a smaller minimum
step size and a smaller maximum total capacitance. As you get up to 10
meters and above, losses in coax due to high SWR get much worse, so you
really want lower than 3:1 on the antenna side of the matching unit
anyway. This 3:1 matching limit on 6 meters is therefore not something I
would call a problem. I was just curious about why the limit is at six
meters instead of at 160 meters.

I think you actually get two to the seventh or eighth power (128 or 256)
values switching 7 or 8 fixed capacitors (or groups of paralleled 
capacitors)in or out, rather than only 7 or 8 values.

DE N6KB

wa3fiy at radioadv.com wrote:
> The limited matching range on 6 meters may have to do with the granularity 
> of the L and C both of which are comprised of fixed values switched into the 
> network binary fashion.  One of my Ten Tec built-in tuners has 8 values of 
> each and a LDG tuner in my Orion Classic has 7 values of inductance and 
> 8 capacitance.
>
> Anyway, that's my guess, granularity.
>
> 73,
>
> -Lee-
>
>
> On 6 Aug 2006 at 10:47, Ken Brown wrote:
>
>   
>> I would expect the tuner capability to be limited on 160 meters, because
>> larger values of capacitance and inductance would be needed there. Why
>> would there be any difficulty tuning up to 10:1 SWR on 6 meters?
>>
>>     
>
>
>
>