[hpsdr] 20W amplifier on EB104.ru

[Sid Boyce]

Hi Conrad,
The 20W PA uses a single MRF150 and it's also the driver part of the 
300W PA.

The BPF works fine with Hermes using the open collector outputs from 
hermes J16.

There is at least one guy running Hermes + eb104.ru BPF + 300W PA/LPF 
under PowerSDR with the full 300W on all HF bands with great reports.
Here I am waiting on a replacement high voltage capacitor for C7 of the 
20W section to get mine running at 300W, hopefully under ghpsdr3-alex 
until the new version of cuSDR is released.

Without the higher voltage C7, the MRF150 dies above 20m. The 
alternative to replacing C7 is to ask for one built with the SD2931 
instead of the MRF150. eb104.ru may have already made those mods as they 
have been made aware of the problem and the suggested mods have come 
from them.
Victor said that they used the MRF150 to use up their stock.

http://www.qsl.net/k5bcq/Kits/Kits.html does a 20W Class A PA that does 
up to 6m but it needs ~1W input and works really well.
73 ... Sid.

On 08/02/14 00:59, Conrad Farlow wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Forget that I see Рабочий диапазон частот 1,8 - 
> 30 МГц which is obviously 1-30MHz. I want something around 20W 
> class A for 50MHz only, any ideas?
>
> Regards
>
> Conrad
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I have been looking at the 20W amplifier on EB104.ru, will this work 
>> on 50MHz, it is not clear from the website. The BPF looks like a very 
>> good buy for the Hermes that I will be purchasing soon. Also has 
>> anyone bought one of the Hermes enclosures from them?
>>
>> Regards
>>
>> Conrad G0RUZ
>>
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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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