Bill,
Correct. Those Italian RM amps use what they call an inhibit circuit. They
either have a high pass or notch filter, I forget which, set at 11 Meters. The
filter is connected to a RF triggered relay that drops out the antenna relay
when an 11 meter frequency is present at the input jack. If it's a high pass
filter, this would mean that 10 meters wouldn't work either. It may be a notch
filter, but it's been so long now, I can't remember.
One would be foolish to think that anyone who buys an amateur amp can't find a
person to convert the amp to operate on 11 meters. Most every amp that's sold
by CB shops is converted before they leave the place. Most of the time, the amp
manufacturer is who supplies the shop with the change over data. I know of
several large amateur radio shops who also sell CB related goods that do this,
though I won't mention their names on here. With the internet, it will be very
easy to find change-over details for anyone who will purchase one capable of 10
meters. If the FCC didn't know it (but I think they really do), what shut the
11 meter tube type amp business down was Richardsons Electronics by buying out
GE Owensboro. The rules to stop 10 meter amps in reality didn't put a dent in
it. Take a look at all the illegal 11 meter solid state amps still out now, and
the RM Italy amps that's been flooding the US for several years.
Best,
Will
*********** REPLY SEPARATOR ***********
On 10/12/06 at 11:57 AM Bill Fuqua wrote:
>Why would an amplifier need a microprocessor unless it had
>auto-tuning. And just by switching to manual tuning you get around the
>problem.
>
>73
>Bill wa4lav
>At 08:44 AM 10/12/2006 -0700, Jim Brown wrote:
>>On Thu, 12 Oct 2006 08:40:34 -0400, Paul Christensen wrote:
>>
>> >From a manufacturer's perspective, there's still quite a burden as no
>gain
>> >can occur between 26-28 MHz. The new rule sounds great at first, but
>> outside
>> >of relatively complex circuitry, how does a manufacturer offer a
>> traditional
>> >(no microprocessor or internal freq. counter) legal-limit amp that is
>> >capable of 1500W at 28.000 MHz, but is unity gain or inoperable at
>27.999
>> >MHz? Simple filters won't work.
>>
>>If your amplifier has a microprocessor, it shouldn't be too tough to sense
>>the input frequency and cause the amp to shut down within the specified
>>limits. And since it would be in firmware, it would be tough for a
>non-techie
>>to circumvent. If I'm not mistaken, several of the "big boys" have been
>using
>>microprocessors and/or DSP for a while.
>>
>>Jim Brown K9YC
>>
>>
>>
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