[1000mp] MPV Driving Amp

[Steve Fraasch]

Mine doesn't wander.

K0SF

-----Original Message-----
>From: Scott Manthe <n9aa at arrl.net>
>Sent: Oct 22, 2006 11:31 AM
>To: All about Yaesu 1000mp <1000mp at mailman.qth.net>
>Subject: Re: [1000mp] MPV Driving Amp
>
>The tuner in the Mark V isn't passive. If you use the rig's tuner while 
>you are tuning up the amp, you'll find that the tuner will "wander," 
>causing the output of the rig to vary and making tune-up more difficult.
>
>There are other reasons I'm sure the more technical types on the list 
>will come up with, but for me, this is a very good reason not to use the 
>rig's tuner. If the amp is already tuned, of course, this is not a problem.
>
>73,
>Scott, N9AA
>
>
>Win wrote:
>> I have heard, or read on this list, that you should not drive an amplifier with the tuner in line. I am sure that there is a good reason for this, but I can not, for the life of me, figure out what is is.  
>>
>> Yesterday, when a DX station I needed appeared on 15 meters, I switchewd the amp over and started tuning.  The SWR going into the amp was 2 to 1, limiting my drive.  This is probably because of some mods I made in the amp.  In any case I turned on the tuner and matched to the amp, and made the contact.  
>>
>> Correcting the problem with the amp is nothing more than adding a cap to the input circuit the nexty time I am into it..  I still ponder, however,  why I should not use the tuner into the amp.  I have done this before many times with other rigs using passive external tuners.
>>
>> Win
>>   
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