Wednesday, 18 October 2017 19:27

Projects - 45W SSB AM Linear CW FM Power Amplifier HF

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45W SSB AM Linear CW FM Power Amplifier HF

HF Amp kit bought on eBay...another one

This page is always updated and may change without any notice.  It is a personal collection of links, information, tips & tricks, and guides for the given subject as I explore new ideas and projects.


Upcomming project....

Not attempting to steal any copyright info from other's, I am only attempting to consolidate some information for myself.



22-may-2017 schematic version 7: T1 corrected.

rf-amp-2078 s2


A full set of my build instructions, in English, will shortly be available for download on the Central Alberta Amateur Radio Club website. Meanwhile I suggest: use a 25V minimum rated capacitor for C3; when adjusting gate bias temporarily insert a10 ohm 5W resistor in place of L1; keep meter leads connected to the L1 pads during test away from the amplifier input [hint: high gain amplifier] replace the supplied potentiometers with 10 turn trim-pots; 


I have receive this kit on 05/02/ problem. there is some difference between the schemas and the printing on the board for example there is a capacity in // of resistor which in in the gate of irf530.All schemas I see have not !...Be careful in adjusting current of the irf530 (or buy several for spare ..HI...not expensive ) I have burn one and replace all by irfz24 without problems. I have adjusted Vgate at 3.5V (not exceed 4V... or use spare if is more for few mW I get 15Wat 14MHZ and 6W on 30Mhz and .... 1W at 50Mhz (surprise)... for 15mW input....25W at 14Mhz (with irfz24). This Kit is interesting for al ,they do not want to make the board, the board is good quality. the only one problem is when it is necessary to change irf when burned






Ebay Description

45W SSB AM Linear CW FM Power Amplifier HF Radio Transceiver Shortwave DIY Kit

Common used in SSB, AM linear power amplifier, the CW, FM, power amplifier, and the most basic signal amplification.
Easy installation and operation.
Low noise, high cost performance, very suitable for DIY enthusiasts.
Our product is sent by parts, which not include heat radiator, please help yourself to assemble.
The overall gain more than 40db, which is 10000 times, 10W input 1mW output.

Input Power: 1-5mW
Output Power: 45W (Max.)
Input Voltage: DC 13.8V 10A or higher 
Max. Output Power: 57W (not with cooling fin)
Output Impedance: 50 ohm, can according to need to adjust between 10-200 ohm
Input Frequency Range: 3M-30MHz(HF channel)
Input/Output Interface: Standard SMA interface, external thread hole
PCB Size: 60 * 100 mm
Diameter of Located Hole: 3mm
Color: Green
Package Size: 13 * 8 * 1.5cm
Package Weight: 58g / 2.07oz

-The following data to test in person, these data sheet is in a large heat sink can withstand 200W above measured, there is not enough cooling capacity, please do not limit, it's not safe.
-The upgrade board test data,so it can be used for all HF Channel,
-In 3 to 5 MHz this period, because of the low frequency, small inductance, lead to the gain has a certain loss, the output power is lower than 7 MHz this point.
3.500MHz  54W
7.050MHz  56W
10.000MHz 57W
14.270MHz 55W
21.400MHz 41W
24.000MHz 37W
28.100MHz 25W
29.600MHz 20W

Package List:E1585
1 * SSB Linear Power Amplifier







Read 18303 times Last modified on Wednesday, 18 October 2017 20:49
Algis Salys

Creator and owner of  Linux enthusiast, electronics tinkerer, and likes to spend time in the workshop building and creating new projects.