[1000mp] Re: Maybe dumb questions ?

[Rob Atkinson]

I've driven my amp with a ts870s using its internal tuner and never had 
a problem.   in fact, when the rig sees a 1.5:1 vswr and folds back, 
the tuner takes that down to 1.2:1 so the rig is happy, puts out full 
power and drives the amp more.   with my mk V the built in tuner 
doesn't seem to want to do anything with 1.5:1 so i don't use it and 
because it has a 200 w. pa, it can provide plenty of drive anyway.   
the mk V tuner seems to be intended to only handle higher ratios, maybe 
2:1 on up.

rob / k5uj

On Thursday, November 3, 2005, at 10:18 AM, Scott Manthe wrote:

> Because as you tune the amplifier, the values of impedence and 
> reactence the internal tuner in your rig sees are changing, therefore 
> changing the output of the rig. I call this "tuner wander," because 
> the tuner wanders around trying to find a match and I don't think it's 
> good.
>
> Now, if you tune-up fast and don't change values, it's probably much 
> better than running the rig into a huge mismatch. But for me, I prefer 
> to turn the tuner off. Since my LK-500ZC has a very good tuned input, 
> it's not an issue.
>
> 73,
> Scott, N9AA
>
> John Becker wrote:
>
>>> It's never a good idea to use an internal tuner with an amp.
>>>
>> Why is this necessarily a bad idea? The input of my homebrew 4-1000 
>> amp apparently isn't close enough to 50 ohms on 15 meters for the Mk. 
>> V without the tuner, but I've been driving it successfully by using 
>> the tuner.
>>
>> 73,
>>
>> John, K9MM
>>
>
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