Bias protection and sequencing are two different things, and both are required. A PIC does the sequencing part very well.

I would use a PIC controller and a switching FET.

Not too hard to make one, Dave. I did that from designs I found on the Net, probably from W1GHZ. It only needs a saw, a drill press, files and a heat gun. 73, Greg, ZL3IX

I also needed a signal source to get going on 10 GHz. My solution was to use a tripler after an ADF 4350 synth module. The tripler I chose was the RMK-3-153 from MCL. It works very well over quite a w

For my HMC952 board I've decided to stick with FR4 and put up with the 2 dB loss across the 50 mm PCB. I've placed the output of the chip very close to one side of the board with the result that most

JLC is the supplier I use but, as I said, they have an engineering surcharge for 0.4 mm PCBs, hence my question.

I've now completed my 10 GHz transverter and am starting on an LNA and PA. For the transverter I used PCBs with a 0.8 mm FR4 substrate and, apart from the 1 dB per inch track loss, it seemed to work o

Can someone please tell me a bit more about spurious modes in equipment mounted in metal boxes, or at least point me to a reference that I can read for myself. In particular, I'd like to know how much

I'm now at that point as well. I have recovered some NE3512s out of a redundant satellite LNB, and have designed the input noise match for 10.4 GHz. According to SonnetLite the NF degradation through

Many thanks OM, just what I needed.

I've managed to open up the LNB. It looks like it has 4 channels, from two feeds x two polarisations per feed. The gain chain for each seems to have two devices, shown in the attached pics, taken usin

Thanks Andy. Photos now attached. After consulting the excellent online book by W1GHZ and trying the software, I now have a handle on how to deal with the dish. The LNB is a different matter, though.

Thanks for answering my request, Andy. Is it possible for the person who makes a post to delete their own offering? Mine will only be relevant for a couple of days while I see if anyone recognises my

Hi all, I've retyped the message but the system still won't let me attach any photos, even small ones of 100k each. Having heard that one can repurpose satellite dish assemblies for use on 10 GHz, I h

Hi, I just tried to make a post with some attachments but got the above message, and the system swallowed the email without trace. Does somebody need to do some archiving? 73, Greg, ZL3IX

Thanks, Mike. After posting my question I did a search and came across Paul's book. I agree with you, it's a great publication.

Hi Neil, There's a lot of interesting theory in your post above. Since I'm new to microwaves I would like to read a bit more background to the theory described in your post. Can you recommend a good r

Hi Andy, I downloaded Sonnet-Lite about 6 months back. I took the trouble to go through the tutorial and it was well worth the effort. I've found that package works well. Greg, ZL3IX (G3ZZI)

The gain of many low noise bipolar devices can be reduced with a small inductor in the emitter. Unlike resistive feedback It doesn't degrade the noise figure, and the stability doesn't suffer either.

Looks like just the sort of thing I'm looking for, Neil, although, as you say, dissipating the heat will be a serious challenge. I'm not sure how to go about that, and will have to do some research on