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Author Topic: Amplifier  (Read 1362 times)
KJ4DHI
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Posts: 57




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« on: October 22, 2017, 01:00:27 PM »

I am almost exclusively QRP, but sometimes in a contest 5w just ain't enough. My equipment consists of MFJ 9420, 9040, and 9320. Can anyone recommend an amplifier for use on those difficult contest weekends?
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KM4DYX
Member

Posts: 62




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« Reply #1 on: October 22, 2017, 04:03:43 PM »

The Hardrock-50 kit is well spoken of. https://hobbypcb.com/products/hf-radio/hardrock-50-hf-power-amp

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KC4ZGP
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Posts: 1637




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« Reply #2 on: October 22, 2017, 05:53:03 PM »


Kraus recommends the EB-104, EB-27A or EB-63. You'll have tons of fun affixing the relay,
power supplies and heat sink.

Be safe.

Kraus
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KC2QYM
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Posts: 848




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« Reply #3 on: November 07, 2017, 06:02:37 AM »

Buy a cheap 100 watt rig and save yourself the extra costs and efforts of amassing all the extra accouterments.  Unless you like building everything or almost everything which is the other side of the QRP appeal. 
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OZ8AGB
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Posts: 334




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« Reply #4 on: November 07, 2017, 06:19:14 AM »

I built one of these (180W version) for my K2.

http://www.communication-concepts.com/an762/
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K8AXW
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Posts: 6312




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« Reply #5 on: November 07, 2017, 11:35:00 AM »

Since you have built stuff, perhaps you might consider the W6JL 40m homebrew amplifier that was in QST a few years ago?  This amp construction article can be Googled and the whole thing can be build for less than US $50.00.  I built one and it worked right off. 

Since it requires very little drive, I built an attenuator into the same box to provide the correct drive from my homebrew transceiver.

The original W6JL article also provides component values for other band output circuits.
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