[hpsdr] munin

[Georg Prinz]

Hello Frank,

why do you invest into 2 amplifiers to improve IMD? I recommend to
invest into a more promising concept! When using a 50V LDMOS amplifier
you are able to get about 300W out of one stage driven by Penelope. If
you reduce now the power of such an amp you will get a fantastic result.
And then you can easily add predestortion software for further
improvement.

Make it as simple as possible!

73, Georg, dl2kp






Am Sonntag, den 25.08.2013, 17:41 -0700 schrieb FRANCIS CARCIA:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> hi All,
> I wonder if there is any issue with type 61 material in the munin
> output transformer on
> 160 meters. The primary inductance is a bit low. I looked at the final
> FET application 
> note and found found a core with a ui=1400 was used. 
> Type 43 seems to work ok on 6 meters.
> Once I finish my summer projects I will be building 2 amplifiers. I
> plan to use larger 
> heat spreaders and big heat sinks to handle high bias. My plan is to
> use a pair of amplifiers
> at low power to improve the IMD at 100 watts. 
> I was once told you can bend a tight bend in thin wall copper tubing
> if you fill the tube with 
> sand first so it doesn't crush. I've never tried it though. I think
> silver plated double shield
> from RG400 or RG142 would make a lower resistance primary.
> Frank WA1GFZ
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