600W – still going on

I had high hopes working on the project over the xmas time, but it turned out to be a very busy time, followed by a hectic work schedule, traveling etc… So after not being able to take part in the CQWW 160m contest due to lack of equipment I started the work again. I just [...]

600W - still in design

So, I have now designed the filter board and calculated the values of each of the 6 filters. I have some 1000V silver dipped mica capacitors that I’m going to use, and have been adjusting the toroids to match them 100%. I decided to use 5 element low pass filters in stead of the 7 [...]

Spreader drilled and tapped

I had some issues drilling the spreader, I thought the drill would go through the copper like butter, that is partially true, but as this is a very thick piece I’m drilling, it grabbed the drill and twisted it. I had two 2.5mm drills twist to bits and I could not get them out of [...]

600w update - pdf's

Here are some excellent pdf’s from the father of the EB104

QST_Dec_1982_p13-16

QST_Jan_1983_p30-33

Motorola-600 Watts RF Power FETs EB104

And here are some of the best links I have found:

crazy italians (must stop this music!): http://i5uxj-2.cln.it/amp/amphf150/amp150.html

This is a good page, if not the best.. : http://www.g4apvweb.pwp.blueyonder.co.uk

One more: http://oh8jep.kotinet.com/eb104.html

This is perhaps not [...]

Update Nov 20.

So, day7 in the H1N1 swine flue s***… just starting to gain consciousness

Got my way to expensive Mouser order today – happy that the FedEx charge was 0.00 usd… so they just smeared that on the rest of the components. Only reason I used Mouser was the selection of 1000v silver-dipped-mica capacitors, they seem [...]

600W process report

This is based on the Motorola EB104 bulletin:

EB104 amplifier board ordered from Communications Concepts, including 4x MRF150 Omron 12V Relays ordered from Ebay – used for TR switching and filter selection Toroids and accessories orderd from Amidon Large heatsink gotten from my father, TF3T 1200VA toroid transformer was bought in my trip to [...]

Project start - 600W 1.8 - 30 Mhz Linear Amplifier

I have been planning to build a 600w linear amplifier to use on the HF bands.

Why homebuilt??

I have been asking my that question many times. If I have to order a commercial built amplifier I have to give out at least $1500-2000 USD. That will put a dent in the home budget and my XYL [...]