[hpsdr] 50 Volt 300 Watt PA from Russia with IMD3 >= 40 dB

[Sid Boyce]

Thanks Arno,
I wanted to enclose a picture but it said my message is larger than 12K 
and awaiting moderator action.

Victor told me they don't ship heatsinks because of problems with 
customs. I don't know if that applies only to the UK customs but you can 
ask him.

Luckily I had a large heatsink on hand (350mm x 250mm x 40mm with a base 
thickness of 10mm) that I bought over 20 years ago for a EB104 that 
neatly fits my case. I was also lucky to pick up another heatsink 
cheaply at a radio rally that could take at least 1KW without a fan and 
I use that with the EB104.

My case which I also bought all those years ago, the front and base 
houses the the ANAN-10 case with Hermes and the BPF. The BPF board sits 
neatly above Hermes in the ANAN-10 enclosure.

The top has the 300W PA/LPF and heatsink and on the back is the Antenna 
socket, power input and an exhaust fan.
When the 2 fit together the fan is in line with an intake grille on the 
front and there is still quite a bit of empty space inside. The case 
dimensions are 300mm x 230mm x 135 mm high.

I don't know of a supplier in Europe but there is http://heatsinkusa.com/
73 ... Sid.

On 05/11/13 20:57, Arno Imig wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Hi all,
>
> I built the 300 watt PA of "rb.104" with Hermes. It works as promised. 
> The IMD3 is 40dB at 300 watts !!
>
> The PA works very well with Hermes. I am very happy with the PA and 
> can highly recommend it.
> I have made the IMD measurement with the Hermes (DUP) and a SDR-1000 
> at the same time.
> On QRZ.Com (DL5AI) some images are intended to measure.
>
> http://www.qrz.com/db/DL5AI
>
> Have fun :-)
> 73, DL5AI
> Arno
>
>
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-- 
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks

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