EMRFD Message Archive 10050

Message Date From Subject
10050 2014-05-23 09:36:01 Alberto I2PHD Going from 5W to 100W
Can anybody suggest a schematic for a simple and inexpensive RF (from 1.8 MHz to 30 MHz) linear power amplifier
that accepts 5W as input and produces let's say 100W as output ?


73 Alberto I2PHD
Credo Quia Absurdum Est Credo Ut Intelligam

10052 2014-05-23 10:14:35 Jim Strohm Re: Going from 5W to 100W
Motorola EB-63 or AN-762.

They don't come much simpler than that....


10053 2014-05-23 10:16:12 Graham / KE9H Re: Going from 5W to 100W

You should consider the openHPSDR "Munin".


Schematics and Bill of Material:

--- Graham / KE9H


10054 2014-05-23 10:26:51 George N2APB Re: Going from 5W to 100W
Check out the Juma PA100 amplifier schematics, online at
Great little amp for 5W in, 100W out. Solid. I use it regularly.
73, George N2APB

10055 2014-05-23 10:33:17 Ravi Miranda Re: Going from 5W to 100W
10056 2014-05-23 11:23:06 Sandeep Lohia Re: Going from 5W to 100W
Power Transistors also glow just they don't last long! Hi


Please encourage recycling, reuse or repairing of E-waste.
10057 2014-05-23 14:53:12 David Nushardt Re: Going from 5W to 100W

Hi Alberto I seem to recall Far Circuits at one time offered a kit for the Motorola application note 100 watt hf amplifier ,a picture  is shown in fig.2.108 its about 80 - 100 bucks to build not exactly cheap.


10058 2014-05-23 15:47:00 Bill Meara Re: Going from 5W to 100W

10059 2014-05-23 17:39:21 kb1gmx Re: Going from 5W to 100W
While they don't do detailed kits Communications http://www.communication-concepts.com/

has the materials to make many of the Motorola amps.  They supply parts and their board is better than
the far circuits version (plated through holes and all).  However this is nto heathkit, it assumes you can take a pile of parts and assemble using schematic and EB (engineering bulletin ).

Look at what they offer.  I'm sure there are other places that have similar as well.



10060 2014-05-23 18:07:01 Dean Blake Re: Going from 5W to 100W
10065 2014-05-24 08:11:43 Alberto I2PHD Re: Going from 5W to 100W
Many thanks indeed to all who offered suggestions and/or pointers, very appreciated.
Now I have a wealth of references to ponder on.

I just need to give some boost to the new DUO QRP transceiver when using it at home.


73  Alberto  I2PHD