That's a nice thing about some of the MFJ auto tuners, and the Palstar
Auto. They have a relay to unkey the amp during a tune cycle. Will
also unkey in the event of a high SWR during operation.
The Power Master meter, and the Wavenode (which I have) will also unkey
for high SWR.
What kills solid state amps is high SWR, too much reflected power, or
too much drive. Amp set to wrong band, wrong antenna, high SWR, or
some catastrophic failure of the antenna or feed line can be causes.
The amps have protection circuits, but sometimes things happen. My THP
SS amp has the same sorts of protection, but I try and be extra careful.
As for overdrive: Ameritron says you can drive with 100 watts. Since
you only need 50 - 60 watts to get full power (depending on band), I
would be leery of this. From what I've read, there is a swamping
resistor in the input that allows for the full 100 watts of drive to be
used. If the resistor changes value over time the full 100 watts can
hit the finals, and el smoke arino.
73, Steve KW3A
On 6/21/2015 9:41 AM, John Miller wrote:
> I mean tuning the antenna, they don't like any mismatch at all with the
> antenna, or the early ones didn't, I don't know if the newer ones are as
> sensitive or not.
> ----- Original Message -----
> From: "Alan R. Downing" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, June 21, 2015 9:20 AM
> Subject: Re: Upgrading my station
>
>
>> I presume that you mean tuning the transceiver while the amp is on. I
>> don't
>> own any transceivers with tubes so there is nothing to tune. My SteppIr
>> has
>> no SWR to speak of, like 1.1:1 or less. The finals just went poof.
>>
>> Alan
>>
>>
>> Alan R. Downing
>> Phoenix, AZ
>>
>>
>> -----Original Message-----
>> From: For blind ham radio operators [mailto:[log in to unmask]]
>> On Behalf Of John Miller
>> Sent: Sunday, June 21, 2015 4:36 AM
>> To: [log in to unmask]
>> Subject: Re: Upgrading my station
>>
>> I've known people to blow the finals in them by tuning them with the amp
>> on
>> or running it without getting the SWR down almost flat, like 1.5 or above.
>> I
>>
>> don't know if that's the same now as it was but I know earlier ones were
>> that way.
>> ----- Original Message -----
>> From: "Jim Gammon" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Sunday, June 21, 2015 2:03 AM
>> Subject: Re: Upgrading my station
>>
>>
>>> Ouch, I will be careful and keep the power down to 400 or 500
>>> watts. I think the current owner does radio tech work for Santa
>>> Barbara County and he bought the amp used from another guy so I
>>> am not sure how old it is. Of course, he says it works well.
>>> 73, Jim
>>>
>>> ----- Original Message -----
>>> From: "Alan R. Downing" <[log in to unmask]
>>> To: [log in to unmask]
>>> Date sent: Sat, 20 Jun 2015 22:20:18 -0700
>>> Subject: Re: Upgrading my station
>>>
>>> Jim, I burned up the finals in mine, so just be careful with it.
>>> I never
>>> found out how I fried the finals, so I couldn't avoid doing what
>>> ever it was
>>> that cost me over $400 to fix.
>>>
>>> Alan
>>>
>>>
>>> Alan R. Downing
>>> Phoenix, AZ
>>>
>>>
>>> -----Original Message-----
>>> From: For blind ham radio operators
>>> [mailto:[log in to unmask]]
>>> On Behalf Of Jim Gammon
>>> Sent: Saturday, June 20, 2015 7:28 PM
>>> To: [log in to unmask]
>>> Subject: Upgrading my station
>>>
>>> Alan, thanks much for your help last week with T31LP. That was
>>> indeed a very cool contact and I got a good recording direct from
>>> my headphone jack. Thanks for asking Lee to explain the project.
>>> On another topic, I am going to upgrade my station here, putting
>>> up a Gap Titan Vertical which covers 80 through 10 and just
>>> today, I found a deal on an ALS600 Amp with power supply. If
>>> anyone has thoughts about that amp, either negative or hopefully
>>> positive, let me know soon because the guy wants to know in the
>>> next day or so. Thanks and 73, Jim WA6EKS
>>>
>>> ----- Original Message -----
>>> From: "Alan R. Downing" <[log in to unmask]
>>> To: [log in to unmask]
>>> Date sent: Sat, 20 Jun 2015 18:59:18 -0700
>>> Subject: Re: I worked Alan last Wednesday morning
>>>
>>> Hello Jim and everyone, yes, I did work Jim when the T31 came to
>>> the group
>>> to work all of the guys. Stan and I had worked T31LP for about
>>> 25 minuttes
>>> when I asked him to drop by 7163 and work the group. He was
>>> gracious enough
>>> to drop by for a good 30 minutes and worked everyone on freq,
>>> including Jim.
>>> T31 is relatively rare, and so it was a good snag for Jim. Drop
>>> by any
>>> night that you can Jim, we would love to have you in the group.
>>> If anyone
>>> else would like to try the group out, we are on 7163 every
>>> morning at 05:00
>>> east coast time, and 02:00 AM out here.
>>>
>>> Alan - N7MIT
>>>
>>>
>>>
>>>
>>> Alan R. Downing
>>> Phoenix, AZ
>>>
>>>
>>> -----Original Message-----
>>> From: For blind ham radio operators
>>> [mailto:[log in to unmask]]
>>> On Behalf Of Jim Gammon
>>> Sent: Saturday, June 20, 2015 5:49 PM
>>> To: [log in to unmask]
>>> Subject: I worked Alan last Wednesday morning
>>>
>>> Thanks Tom, will remember Alan and try to send positive prayers
>>> and energy his way. I just talked with him around 02:00 last
>>> Wednesday morning when we were talking to T31LP on the Amelia
>>> Earhart project. Alan helped me get in contact with them.
>>> Thanks Alan! Jim WA6EKS
>>> ----- Original Message -----
>>> From: Tom Behler <[log in to unmask]
>>> To: [log in to unmask]
>>> Date sent: Sat, 20 Jun 2015 19:13:53 -0400
>>> Subject: Health Update On Our Friend Alan, N7MIT
>>>
>>> Hello, everyone.
>>>
>>>
>>>
>>> I have been corresponding back and forth with our friend Alan
>>> (N7MIT),
>>> regarding various issues pertaining to learning the I phone, and
>>> I requested
>>> an update on his latest health concerns.
>>>
>>>
>>>
>>> Unfortunately, the news is not very good.
>>>
>>>
>>>
>>> Alan has given me permission to share the news with the group.
>>>
>>>
>>>
>>> To quote Alan himself:
>>>
>>>
>>>
>>> "I got very bad news yesterday regarding my lung biopsy. I have
>>> adno
>>> carcinoma in both lungs, and have been referred to a specialist
>>> that deals
>>> with cancer of the lung. It sounds pretty bad, but I will fight
>>> it."
>>>
>>>
>>>
>>> Let's all continue to keep Alan in our thoughts and prayers.
>>>
>>>
>>>
>>> Tom Behler: KB8TYJ
>
>
>
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