[Amps] Overdrive protection

[Paul Christensen]

Joe,

According to the operating manual, the FTdx-5K's E.ALC switch is used to 
change ALC recovery time (not gain), supposedly for optimized operation into 
the VL-1000 solid-state amp.  The alternate switch position is for "all 
other" amps.

Just another reason to avoid use of an ALC link since there's never been an 
industry standard as to ALC level and feedback dynamics.  ALC does seem to 
work best when used across one manufacturer's products and not mix/matched 
with other brands.  Still, the issue is best resolved with: (1) smart amps 
that protect themselves against hot-switching and excessive power input; and 
(2) well designed ALC in transceivers.

Paul, W9AC

----- Original Message ----- 
From: "Joe Giacobello, K2XX" <k2xx at swva.net>
To: "Roger (K8RI)" <k8ri at rogerhalstead.com>
Cc: <amps at contesting.com>
Sent: Saturday, July 28, 2012 10:09 AM
Subject: Re: [Amps] Overdrive protection


>I probably should address this question to the FT-5000 list, but since
> this discussion concerns ALC control, it's also appropriate here.  There
> is a switch on the back of the 5000 called E.ALC.  According to the
> manual, this switch changes the ALC gain from high to low and vice
> versa.  It's not clear to me what Yaesu means by ALC gain.  Is it the
> range of voltages that the exciter responds to for throttling the drive
> to the amp?  That makes sense, but I've never heard that term before.
>
> Can someone enlighten me?
>
> Thanks and 73,
>
> Joe
> K2XX
>
> On 7/28/2012 2:36 AM, Roger (K8RI) wrote:
>> On 7/27/2012 3:49 PM, Richard Solomon wrote:
>>> So far, I have seen no mention of the current YAESU rigs. Has anyone
>>> had a problem with any of them (and I do mean RF overshoot) ?
>>>
>>> 73, Dick, W1KSZ
>>>
>>> On Fri, Jul 27, 2012 at 12:39 PM, Jim W7RY<jimw7ry at gmail.com>  wrote:
>>>> Although the 756 Pro line is notorious for this,......
>>>> 73
>> I run both the old 756 Pro and the new Yaesu FTDX5000MP with no problems
>> from either.  The 5000MP drives a tetrode amp generally in class A, but
>> sometimes in AB1
>>
>> 73
>>
>> Roger (K8RI)
>>
>>>> Roger (K8RI)
>>>>
>>>>
>>>> What do you base your statement on Roger?
>>>> Just hearsay or actual experience? Something on the web?  If so, could 
>>>> you
>>>> point me to it?
>>>>
>>>> Thanks
>>>> 73
>>>> Jim W7RY
>>>>
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