[hpsdr] Angelia-Alex-Munin Transceiver.

Kjell Karlsen la2ni at online.no
Tue Jan 29 04:29:01 PST 2013

Hi all.

I have built a new OpenHPSDR Transceiver using Angelia, Munin and the Alex  
filters installed in a small rack. The size is (W X H X D) 280 X 90 X 240  
mm. The rack is more or less home made but you can find similar enclosures  
that can easily be modified for this use.

The rack is divided into two horizontal rooms and Angelia is installed in  
the upper compartment together with the power input filter and the fan.  
Munin+ Heat Sink and the Alex filters are in the lower compartment. The  
cooling air is blown down through the heat sink and out on the back.

I have uploaded 7 pictures to http://www.hamsdr.com/profile1.aspx?id=6498.

**185.jpg: The top compartment seen from the front.
**188.jpg: The top compartment seen from the back.
**189.jpg: The bottom compartment seen from the back.
**190.jpg: The bottom compartment seen from the front.
**192.jpg: The unit with cover installed.
**193.jpg: Both Angelia and Hermes/Apollo from back side.
**195.jpg: Both seen from front.

This is NOT how ANAN-100D is going to look like! It is my solution and  
Hermes can of course be used instead of Angelia.

As you might see on **188.jpg, I am using a 10-30V 90W PicoPSU directly  
plugged into Angelia. There are no detectable spurs generated by this PSU.

Munin can safely run on 24V. I have not done any exact IMD measures so far  
but what I see is that the IM3 and IM5 are at least 6-10 dB better at 24V  
than at 13,8V with 100W PEP out. Even at 150W PEP, the IM3 and IM5 are >  
-32 dbc (PEP) at 13,8V on all bands except on 12, 10 and 6 meter.

You will also see that I have glued a large heat sink removed from an old  
VGA card on the FPGA. It is not absolutely necessary but I feel better  
using it! On the two AD Converters I have placed heat sinks made for RAM  
chips. You can find them on e-bay.

The fan is 80X80 mm salvaged from an old PC PSU. It is temperature  
controlled so it normally runs very quiet.

The DC input filter is installed just to be safe. As you see, I am using 4  
Power Pool connectors, 2 for each wire.

The 9 pin D-connector is going to be replaced by a 15 pin and used to  
control an external PA or antenna switch.

This is what I have used the darkest time of the year for! Now we have got  
the sun back after nearly 2 months darkness. Still the day is short and  
cold but with half a meter of snow, the skiing conditions are good.

73, Kjell

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