14-02-2018, 05:27 AM
Hi all,
On hols, Diamond Head NSW.
At $12 ea. I bought six MRFE6S9160 LDMOS transistors six months back.
I found plenty of designs for these.
I got the heat spreader from my local metal scrappie (Penrith NSW) two pieces
of 4" copper bus bar 1/4" thick. I was stoked, $40 for six spreaders.
On looking at the designs, I see no reason for PCB. Surely, copper strip laid over
teflon sheet and clamped in place will work.
I'll be able easily to get the stripline impedance down to 5 ohms, then a Pi coupler.
150W per transistor, two will get close to our legal limit.
Power supply: my 24V UPS battery system, now solar charged.
Alan VK2ZIW
On hols, Diamond Head NSW.
At $12 ea. I bought six MRFE6S9160 LDMOS transistors six months back.
I found plenty of designs for these.
I got the heat spreader from my local metal scrappie (Penrith NSW) two pieces
of 4" copper bus bar 1/4" thick. I was stoked, $40 for six spreaders.
On looking at the designs, I see no reason for PCB. Surely, copper strip laid over
teflon sheet and clamped in place will work.
I'll be able easily to get the stripline impedance down to 5 ohms, then a Pi coupler.
150W per transistor, two will get close to our legal limit.
Power supply: my 24V UPS battery system, now solar charged.
Alan VK2ZIW