General Category > For Sale / Wanted / Barter

400W RF GENERATOR

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Stretchyman:
I have for sale some fully tested PCB's I made last year;

16Ch DDS, preprogrammed, selectable with DIP switch.

Quad GaN, latest FETs from Transphorm.

NCP81074 fast drivers.

90 % efficient, just needs bolting to a modest heatsink or metal case with small fan.

FETs have grounded tabs so no need for insulating washers etc.

PSU needs to be 48V @ 10A.(+12V@120mA for drivers)

I've had considerably more power from these with 600W @ 60V but things start to get a bit warm. At 400W it can be passively cooled.

ANY 200KHz band segment. (8MHz max)

I'll post up some pics on eBay but thought it best to advertise on here first.

$300 ONLY!

I can provide full instructions etc.

Has been heard in the air with good reports!

You will need your own modulator etc..

Str.

Monophonia:
Interested to see pictures. I may be inclined to get lazy,

Stretchyman:
Please mail me...

stretchyman2kATgooglemailDOTcom

OgreVorbis:
I'm am interested in this transmitter, but I'm more interested to see the schematics than to buy it. I've learned I will always want more power and upgrades, and for that, it's better for me to understand the design first. Would you be willing to offer the schematics?

I'm also curious about the bandwidth of this design. Could a DDS module from ebay with 9850 and free tuning 2-30 MHz be used instead of channels? Of course, it probably can't go all the way to 30 MHz. You say 200 KHz segment, so it's narrowband (ie not balun match)?

Stretchyman:
It's Class E and therefore narrow banded. Stop thinking about a Tx that covers the whole of HF, how are you going to switch the filters etc?
Single band designs make EVERYTHING so much simpler....

The genrator is 120x100 that's mm not inches!

Sorry I'm not willing to hand over the schematics, it's nothing special or different than any other design, just that I use modern parts.
The majority of work involves doing a decent PCB layout BTW.
I've spent over 2 years and £?? getting it right, I'm not just going to hand it over to you for nothing!
There's plenty of other designs on the net, why not use one of those, they may work!

Str

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