50MHz 500Watts Linear Amp Using IRF510

I came across this site with a super design that uses 16 cheap IRF510 power transistors to get 500 Watts of RF power. Now, this is an Ideal amp for hams in India as these transistors are available very cheap over here.

Here is the link to the site. You can find the entire PCB layout, Schematics etc there.

http://frenning.dk/OZ1PIF_HOMEPAGE/50MHz_IRF510.htm

I have put this in my to-do list and in the mean while, i hope you like building it.

Labels: amateur radio, electronics, ham radio, HF, power amplifier, radio, RF, RF amplifier

Bitx20 Kit from VU3SUA

Yay!!, I received my Bitx20 kit from Sunil Lakhani(VU3SUA) today. I was jumping with joy as i received it. The postage + the time in transit was very normal. And he had included Front end coils, Balun Cores, Dumbbell cores, and a transistor that is a little difficult to obtain in local shops. He also sent me a free Frequency Counter PCB!!! I love this guy!!.

The boards were of excellent quality, some spacings are some times a little large and some time a little short, but its okay since it is totally designed here. The PCBS were all plated and masked. Very well made I would say.

Here are the contents.
1. 1x Bitx20 Main Board,
2. 1x Power supply and Linear Amp PCB,
3. 4x Front end Transformers (Already wound),
4. 7X Balun Transformer Cores,
5. 2x Dumbbell transformer cores,
6. 1X 2SC2570 Transistor.

The packing was excellent, he had taken utmost care to pack them properly with a polythene cover, then a paper cover (had a contents listing), and a thermocol protection around this cover and then all these covered in the standard cloth based packing used for Speedpost. Yes, I did spend a lot of time unpacking it :).

I will post the photos of the PCB as well as the contents of the kit in this post as soon as I can arrange a digital camera.

So, I am back to building the kit now, have fun :), and hang in there for more.

Labels: amateur radio, electronics, ham radio, HF, power amplifier, Power supply, radio, RF, RF amplifier

ARF448A/B

When my Ham friend Biju visited me last week, he mentioned about a low cost RF power amp circuit using MOSFETs called ARF448A and ARF448B (ARF448A/B). Here is the circuit(PDF File). And the datasheet for the same is available here.


Soon afterwards I started searching for these power MOSFETs and could not find even a single source over here in India. So, I finally came to this person from china who supplies these in bulk. Now the problem is how to buy around 500 pieces of these and how to get it to India without paying exorbitant duties and stuff like that. I am interested in a group buy. So, If any of you readers are interested, we can work something out, Please comment me with the desired number that you are willing to buy and how can you pay me etc. I will soon update this post with the invoice this contact of mine provides.

Lets see if we can have a cheap solid state linear amp for the HF spectrum.

Say good luck, Suckers!!! ;)

Labels: amateur radio, ham radio, HF, power amplifier, radio, RF amplifier