[hpsdr] munin

[FRANCIS CARCIA]

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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