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The Ham Radio Shop

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Joined: Mon Jun 13, 2011 12:26 pm
Posts: 173
Location: Chesterfield
Feedback: 29 (100%)
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I endorse all previous comments on the Hardrock 50 amplifier. I have a Revision F amplifier (s/n 12**) and have now added the Hardrock 50 internal ATU in December 2014.

This internal ATU kit is supplied to the same exacting standards as the Hardrock 50 itself and the build instructions are just as well written.

I decided to modify the original amp board to give full output on 60m. If this is not implemented the power output on 60m is given as 35Watt. This requires changing 3 SMD capacitors on the power amp board and adding two further SMD capacitors. This mod was easily accomplished and now gives 50 W output on 60m. Newly purchased amplifiers with a serial number above 1400 do not require this modification as it is already incorporated on the board.

The amplifier is wired to my KX3 and automatically band changes. The amp is used standalone on the LF bands and is used as a driver for my SPE 1K-FA linear to give 400 W output (the UK legal limit) on 20m and above. The ATU can be bypassed if using an external device or remote tuner.

The entire system is run using Win4KSuite software by VA2FSQ along with the integration of DXLab. A really great operating system.

The cost now that the amp and ATU can be purchased together saves on postal charges and Post Office handling charge on behalf of the UK Customs Authority.

January 2015
Overall a fantastic package and enjoyable build project.

Fri Jan 02, 2015 5:53 pm
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Joined: Wed Jul 16, 2008 7:01 pm
Posts: 2520
Location: Kidsgrove, Stoke-on-Trent IO83VC
Feedback: 9 (100%)
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They are indeed good value for money and work well, I have yet to add the auto ATU into mine but will be doing so in the future.
I'm very happy with mine, and it makes a remarkable difference to qso success rates when used with my KX3.

Building your own equipment is one of amateur radio's most satisfying elements.

Fri Jan 02, 2015 6:03 pm
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