[1000mp] MPV Driving Amp

[Steve Fraasch]

I just tried it on two bands with my QRO HF2500: absolutely no tuner "wander" whle tweaking the output settings.  The amplifier output circuit is isolated by the amplifier gain, hence output tuning changes will make little difference at the amplifier input.

Did your MP tuners drift into loads other than amps ? If they did the SWR threshold may be too low, hence an adjustment.

The tuner is not "active" either, I assure you it is quite passive.  I think you mean it is automatic.

This is getting silly.  I quit.

Steve, K0SF

-----Original Message-----
>From: Scott Manthe <n9aa at arrl.net>
>Sent: Oct 22, 2006 12:03 PM
>To: Steve Fraasch <sfraasch at earthlink.net>, 1000mp at mailman.qth.net
>Subject: Re: [1000mp] MPV Driving Amp
>
>I've had three Fields, all of which "wandered." This is normal, because 
>when you tune-up the amp, the load to the rig changes, causing the tuner 
>to readjust to follow those load changes, hence the wandering.
>
>Scott, N9AA
>
>Steve Fraasch wrote:
>> Yours might require an alignment.
>>
>> -----Original Message-----
>>   
>>> From: Scott Manthe <n9aa at arrl.net>
>>> Sent: Oct 22, 2006 11:40 AM
>>> To: Steve Fraasch <sfraasch at earthlink.net>, All about Yaesu 1000mp <1000mp at mailman.qth.net>
>>> Subject: Re: [1000mp] MPV Driving Amp
>>>
>>> I have a Field and it does.
>>>
>>> Scott, N9AA
>>>
>>> Steve Fraasch wrote:
>>>     
>>>> 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
>>>>>
>>>>>
>>>>>
>>>>>     
>>>>>         
>>>>   
>>>>       
>>
>>
>>
>>