[minima] Re: Minima power output
- From: Arv Evans <arvid.evans@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Tue, 4 Feb 2014 10:22:28 -0700
Ryan AG4ZP
There is a JBOT linear amplifier associated with Minima. It is similar to
the
same amplifier used for BITX Ver-3 transceivers. "JBOT" stands for "Just a
Bunch of Transistors" and is a push-pull arrangement of paralleled
transistors.
<http://www.hfsignals.org/index.php/File:Qrp-linear.png>
While the JBOT design is adequate, several persons are working on improving
the design in order to have better stability and more power output over the
full
HF range. When and if we come up with an improved design we will publish
details.
Arv K7HKL
_._
On Tue, Feb 4, 2014 at 8:35 AM, Ryan Kingsbury <ryan.kingsbury@xxxxxxxxx>wrote:
> Hi folks,
>
> I should probably be melting solder rather than scratching my head about
> how the design is supposed to work but...I have some unanswered questions
> about the design.
>
> On the Minima website, it states that the design features 1 watt output
> power in the summary towards the top. Surely this is a typo? Unless the
> mixed formed by T1 provides a significant amount of gain, I can't imagine
> that the IF amp (Q6,7,8) is pushes more than a watt through the crystal
> filter, mixer and LPFs.
>
> Further down, in the design history sections, it says the output power is
> 1 mW (0 dBm). This seems much more believable to me. If combined with a
> PA, such as the JBoT, then I can see how the combination could deliver 1 W.
> Could someone else confirm?
>
> Thanks in advance for the advice. I promise to start melting solder soon!
>
> 73,
> Ryan (AG4ZP)
>
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