On Aug 12, 2005, at 8:49 AM, Pete Smith wrote:
> This is a little over-severe.
"This" was what their technician told me, Pete.
- The Ten Tec Titan also uses 3cx800A7s and fairly high Q parasitic
suppressors. A Ten Tec Titan - with reportedly c. 20 operating hours -
that I worked on had gold-sputtering in both tubes. Since the VHF
suppressors in the Titan and the 230A are relatively high Q devices, it
seems reasonable that if the Titan has a history of parasites, the 230A
could also have the malady.
- From a business point of view, manufacturing an amplifier that
occasionally has a parasite which can damage the amplifier,
necessitating its return for warrant repair is surely a cash flow
nightmare.
cheers
> The maker of the ARD-230A was a small
> defense contractor whose proprietor was a ham. The 230A was the first
> auto-tune amp, and worked well, for the most part, but the company
> failed. I think you can bet that very few parts in the amp (as
> opposed to
> any programmable electronics) were proprietary.
>
> 73, Pete N4ZR
>
> At 10:07 AM 8/12/2005, Will Matney wrote:
>> Rich,
>>
>> Of course the higher ups wont admit to that and make a change in a
>> product
>> all ready released. As soon as the customers who already own one
>> found out
>> about the change, they would all want theirs modified and fixed for
>> free.
>> Same as a recall on a car. The car companies wont admit to nothing
>> either
>> until it gets so bad with so many complaints by insurance companies,
>> customers, and the government, they make a recall. If it's so bad,
>> they
>> merely kill the model, and don't make it anymore with no
>> explanations, but
>> they wasn't selling good. That goes on everywhere today and leaves the
>> ones who bought the products hung out to dry.
>>
>> Best,
>>
>> Will
>>
>> *********** REPLY SEPARATOR ***********
>>
>> On 8/12/05 at 6:50 AM R.Measures wrote:
>>
>>> On Aug 12, 2005, at 4:48 AM, Fortra wrote:
>>>
>>>> Hi Amperes,
>>>>
>>>> I am in process to make a difficult decision, whether to buy an
>>>> Advanced Radio Devices Amplifier ARD-230A. The amp is in apparently
>>>> good conditions, with quality parts, and operational. Does anyone of
>>>> you have had any experience with it??
>>>
>>> I used to discuss, via mail and telephone, the ARD 230A with the
>>> factory technician who repaired them. He told me that some of units
>>> that came back under warranty for repair appeared to have been
>>> damaged
>>> by intermittent VHF or possibly UHF parasitic oscillations, which
>>> should probably not be surprising since the 3cx800A7 is rated for
>>> full
>>> input in "Amplifier and Oscillator Service" up to 500MHz. After he
>>> read my articles in *QST* discussing parasites, he became more
>>> convinced that he was on the right track and he contacted me. He
>>> subsequently informed the owner and designer of the repeated signs of
>>> such damage he was seeing and suggested that they try decreasing the
>>> Q
>>> of the VHF suppressors in order to decrease VHF and UHF gain. The
>>> suggestion was rejected, the problems continued, and within a year
>>> ARD
>>> went under. I still have the set of ARD 230A drawings he sent me
>>> during the discussions, so if you would like to have them I will mail
>>> them to you.
>>>
>>>> Judging from Google search, most of the problems were with software
>>>> (run by Z-80 processor).
>>>
>>> - - - Editorial opinion -- As I see it, unless the equipment is to be
>>> operated by a moderately retarded chimpanzee, trying to control a RF
>>> power amplifier with a microprocessor makes about as much sense as
>>> trying to control a lawnmower with one.
>>>
>>>> Amp has otherwise quality parts as Alpha not to get into great
>>>> detail.But as it is fully remote, should I give in into it....Your
>>>> advices please!
>>>>
>>>> p.s.It has pair of 3cx800a7
>>>> _______________________________________________
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>>>>
>>>>
>>>
>>> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>>>
>>> _______________________________________________
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>>> Amps@contesting.com
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>>
>>
>>
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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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