[1000mp] Re: Maybe dumb questions ?

[N5NF Watt]

OK.  Glad you got them.  Yes I was surprised too.  I went directly to the 
bat with 14 Gauge and it worked fine.  Watt Enjoy you weekend.  Just worked 
a special event stn in Mn for the E;dmond Fitzgerald that went down in a 
storm some years back on lake superiour.  Watt
----- Original Message ----- 
From: "Rob Atkinson" <k5uj at sbcglobal.net>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Saturday, November 05, 2005 4:48 PM
Subject: Re: [1000mp] Re: Maybe dumb questions ?


> Hi Mike; thanks.
>
> 73,
>
> rob / k5uj
>
> On Friday, November 4, 2005, at 06:37 AM, Mike Schatzberg wrote:
>
>> Hello Rob:
>>
>> To try and tune your Mark V into your amp a SWR of 1.5:1, you might try 
>> two things.
>>
>> Firstly, if your input cable to your amp is just a short jumper, try a 
>> cable of perhaps 15 to 20 feet of RG 8 type coax instead.
>>
>> Secondly, force the tuner to adjust while in the CW mode, and sending a 
>> string of dits at perhaps 35 words per minute.  If the tuner memories are 
>> full, you will want to do a memory reset first.  This is a good idea 
>> particularly if you change the input cable.
>>
>> I have found that the tuner will reduce the indicated SWR better with the 
>> above method, and reach 1:1 in my Mark V.
>>
>> You may see the SWR decrease with just the addition of the longer cable, 
>> and no tuner will be necessary at all with the 1:1 match.
>>
>> If your amp has a tuned adjustable input, after you add the cable, you 
>> can tune the amp input for minimum SWR as well.
>>
>> 73 and Happy Dxing,
>>
>> Mike
>> WB2AJI
>> ----- Original Message ----- From: "Rob Atkinson" <k5uj at sbcglobal.net>
>> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
>> Sent: Friday, November 04, 2005 6:43 AM
>> Subject: Re: [1000mp] Re: Maybe dumb questions ?
>>
>>
>>> 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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>>>
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