[hpsdr] Which 100-Watt Power Amplifier for HPSDR?

[Kjell Karlsen]

Hi Bob.

As the one responsible for the development of Munin I´ll try to give you  
an answer:

I made one lab model of Munin and got it working with normal functions on  
all bands except 6 meter where the linear output was only 80 W PEP. (IM3  
better than -30 dBc).

10 new PCB´s were made and distributed to the Beta builders. That was  
nearly one year ago and until now only 2 of them have built and measured  
their Munins.

In the meantime I have improved the linear output by replacing the output  
transformer using one that follows the ideas of Helge Granberg. Now the  
linear output is >100 W PEP when Vcc is 14V. (in fact it is >115 W on 6  
meter) On the other bands it is >130W PEP with very good linearity. When  
the voltage is decreased to 12,5 V the output drops but that seems to be  
normal with all PA´s using RD100HHF1.

This results have been verified by the 2 Beta builders.

I have to do some minor modifications on the PCB layout but I believe the  
construction is good now.

We have to discuss with TAPR about the progress of this project. I feel  
the time is running away if we have to go through a new "Beta" build.

This amplifier is compatible with Pennylane, Penny and Hermes. In addition  
it may be driven by any exciter that can give 0 dBm to +10dBm output.

73, Kjell








På Mon, 26 Sep 2011 06:20:41 +0200, skrev Bob Mahrenholz <bobm at edge.net>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi:
>
> In checking the http://openhpsdr.org/  "roadmap", I find that the  
> SOFTWARE description for POWERSDR-WINDOWS calls out
> the HERCULES amplifier from NT-Electronics for the 100-watt power  
> amplifier for HPSDR.  Doing a  Google search reveals no
> current source from which to purchase this unit.
>
> The HARDWARE description on the same "roadmap" lists the MUNIN for the  
> 100-watt power amplifier and states that TAPR is
> considering offering a "kit of parts" for MUNIN.
>
> What is the current status of each?  Which will be compatible with  
> Pennylane?  Which one should I be saving up for?
>
> Thanks,
>
> Bob Mahrenholz
> K4QQK
>
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