[hpsdr] Munin

[Kjell Karlsen]

Hi Byron.

I have just finished the measurements on on assembled Munin and I had no  
problems. I have also tested with different versions of the output  
transformer and I could see small differences in output on 6 meter using a  
"conventional " transformer, around 10W less PEP. But I have had no "self  
oscillation" that could have C27 to let out smoke.

Can you send me a picture of your PA transformer?

On 10 meter , the IM3 is a bit higher at 100W PEP than on the lower bands  
but the gain is within +-3 dB except on 6 meter were it is ca 10 dB lower  
than on 20 meter.

Are you using Hermes as the driver for Munin? If so, what Gain By Band do  
you have on the different bands to get 100W PEP using the built in 2-tone  
test. At 100W PEP, your Power meter should show 50W average. And how much  
current is drawn at 100W PEP? I read around 11-12 A on different bands  
except on 6 meter were it is around 14A.

If you do not have a new 470 pF/200V NPO capacitor, you can build it up  
using smaller values but at least 200V rating.

73, Kjell




På Sat, 07 Sep 2013 01:35:47 +0200, skrev Byron Engler  
<12byron34 at gmail.com>:

> Hi all,
> I have got my Munin kit assembled and started testing it yesterday.  
> Initially everything looked fine (160-40m) with the expected output  
> power of around 100W, then as I increased frequency the output started  
> to reduce with only about 50W out on 10m. I then tried 6m and thats when  
> the smoke come out of C27.
>
> Any ideas as to what the problem is?
> Im going with either my dummy load isn't 50ohm over 0-MHz (its a  
> homebrew one) or I have not correctly assembled the output transformer.
>
> 73, Byron ZL3DXT


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