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Bias protection circuit with mmic
Bias protection and sequencing are two different things, and both are required. A PIC does the sequencing part very well.
Bias protection and sequencing are two different things, and both are required. A PIC does the sequencing part very well.
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Greg - ZL3IX
· #64779
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Bias protection circuit with mmic
I would use a PIC controller and a switching FET.
I would use a PIC controller and a switching FET.
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Greg - ZL3IX
· #64763
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Looking for a WR90 to coax adapter
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
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
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Greg - ZL3IX
· #64377
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10GHz Capable Sig Gen WB SG 1
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
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
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Greg - ZL3IX
· #64063
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Thin substrates for microstrip.
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
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
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Greg - ZL3IX
· #63900
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Substrate thickness for 10 GHz
JLC is the supplier I use but, as I said, they have an engineering surcharge for 0.4 mm PCBs, hence my question.
JLC is the supplier I use but, as I said, they have an engineering surcharge for 0.4 mm PCBs, hence my question.
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Greg - ZL3IX
· #63857
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Substrate thickness for 10 GHz
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
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
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Greg - ZL3IX
· #63851
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Spurious box modes
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
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
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Greg - ZL3IX
· #63664
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10Ghz preamp?
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
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
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Greg - ZL3IX
· #63507
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Does anyone recognize this?
Many thanks OM, just what I needed.
Many thanks OM, just what I needed.
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Greg - ZL3IX
· #63402
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Does anyone recognize this?
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
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
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Greg - ZL3IX
· #63381
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Does anyone recognize this?
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 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.
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Greg - ZL3IX
· #63131
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'Group out of space'
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
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
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Greg - ZL3IX
· #63129
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Does anyone recognize this?
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 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
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Greg - ZL3IX
· #63087
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'Group out of space'
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
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
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Greg - ZL3IX
· #63086
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Dish choices for 10GHz.....
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.
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.
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Greg - ZL3IX
· #63082
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Dish choices for 10GHz.....
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 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
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Greg - ZL3IX
· #63077
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Can someone design me an S-Band microstrip filter
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)
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)
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Greg - ZL3IX
· #62973
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High IP 2nd stage for 432MHz
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.
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.
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Greg - ZL3IX
· #62565
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QRP PA devices for 10 GHz
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
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
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Greg - ZL3IX
· #62384
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