[Amps] Why no 28 MHz

[Joe Subich, W4TV]

> Of course, it is a practical impossibility to shut out that segment
> and still allow full 10-meter coverage.

Except for those amplifiers that use a microprocessor controller with
frequency counter.  The controller can be programmed to lockout when
detecting RF between 26 and 28 MHz.  If the amplifier is also designed
so that it is impossible to operated with the processor defeated the
design will pass muster under the new rules (the SPE Expert, THP 1.5Kfx
and 2.5Kfx are all examples of this approach).

73,

    ... Joe, W4TV


On 1/25/2011 11:40 PM, Glen Zook wrote:
> Both the HR-2510 and HR-2600 Uniden can be "opened" by cutting a trace on the circuit board and inserting a resistor.  This changes the coverage from 28.000 MHz to 29.6999 MHz to 26.0 MHz to 29.6999 MHz.  Uniden tried, at least for those units sold in the United States, to discourage this by putting a layer of epoxy over that area of the circuit board.  But, 10 seconds with an Xacto knife or razor blade took care of the expoxy.
>
> As for 10 meters on linear amplifiers:  The FCC did remove the ban on 10-meter operation for certification.  However, there is a "gotcha" in the fact that a certified amplifier cannot be capable of amplifying frequencies between 26.0 MHz and 28.0 MHz.  Of course, it is a practical impossibility to shut out that segment and still allow full 10-meter coverage.
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Tue, 1/25/11, Fuqua, Bill L<wlfuqu00 at uky.edu>  wrote:
>
> I have a brand new in the box HR-2600 10 meter all mode that I put up on eHam for sale and they took the advertisement off.  An email telling me that it was too easily converted to 11 meters and so banned from sale.  You have to make a crystal change and tweak a few pots to get it on 11 meters I would guess, it is not an easy job by any means.
>
> My point is that even though the FCC changed the rules it seems no one is about to change their practice.
>
>
>
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