630-METER-AMPLIFIER-011219.pdf

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225 WATT 630 METER AMPLIFIER
The advantage to this design is the use of a dual MOSFET driver chip.
Large print schematic on the last page
L1, L2, L3 coil data used from the link below. I made no change
in the coil data. The link should be read as the information applies
to both the input and output stages.
http://njdtechnologies.net/a-few-construction-notes-and-useful-
modifications-for-the-gw3uep-amplifier/
COIL DATA for T106-2 Ferrite cores
L1 is 12 uH, which is 30 turns of #18 mag wire (50 inches)
L2 is 6.5 uH, which is 22 turns of #18 mag wire (35 inches)
L3 is modified as this is the low pass filter and is not ample to be legal in the US. Change
the value to 13 uH, which is 31 turns of #18 mag wire. At the ferrite, parallel a 2200 pF
pulse rated poly capacitor, preferably 1% (or good quality, 500v silver dipped mica TX
cap). Minimum voltage should probably be 400 V in spite of really only needing about 100
V. This capacitor takes a beating.
Be sure to use WIMA Pulse capacitors in the RF stage. Below is
the parts list from Mouser Electronics.
505-FKP46800/1KV/10
6.8 nF 1kv $0.54 each
505-FKP4.015/1000/5
.015 uF 1kv $1.06 each
505-MKS4G041006BKJ00
1uF 400V $1.52 each
For the tuning capacitors I used silver dipped mica 500v
A good place to get the IFRP250, TC4427, and other parts.
www.taydaelectronics.com
ships from a USA warehouse within 5-7 days.
For the 10 VDC regulator, a LM7810 will work just fine. Place a 470uf on the input and 100uf on the
output of the regulator. If using a DC-DC regulator module like the LM2596, check the output with a
scope. Additional filtering may be needed to clean up the internal switching circuit.
The reason the 10VDC was used it will produce the correct drive voltage from the TC4427 for the
IRFP250 gate input.
I have found that a reliable LC meter is very helpful. I picked up a LC200A from EBay that has worked
very well for me.
From the picture notice the phase alignment of the three coils. Shielding was not necessary.
I placed a small 1-�½” 12VDC fan on the bottom of the amplifier connected to the 10 volt regulator
output. After running for a long time at 225 watts out, I have yet to feel any heat coming from the
amplifier, it runs very cool. The coils T2 and T3 will get warm after running a long time, and that is the
reason I added the fan to remove any heat from the closed up housing. I don’t think it’s really
necessary.
Upper right hand corner is the 10vdc regulator module.
Top center L-1
Bottom center is L2
Bottom left L-3
Upper left P-channel switch
Center of picture are the two IRFP250
In the center of the picture there are two resistors and a capacitor in series. That is not in the final
circuit, only used in testing and is not needed.
There is a cutout in the circuit board for the MOSFET’s to attach directly to the heatsink. The circuit
board is mounted in a 2 meter amplifier housing (a Hamfest find). The circuit board is 6” X 8”.

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