Hi All, I would like to thank Scotty for his continued dedication to this project, he has made a couple of new significant contributations in the last month. I...
hi everybody! i decided to build this analyser...i am a student...i search your's site...i saw top copper's of circuits..but i cant see control boards..how...
Hello Scotty I am designing a Comb generator using SRD. This module generates harmonics from 9 to 11 GHz spaced at 100 MHz with 20dBm input power. How do i go...
Hi All, I have just posted a schematic and board layout for a frequency multiplier. I actually built this multiplier, except the version I built used +/-5...
msshringi, I don't have a direct answer for you, but.... I once did a Google search for SRDs, looking for sources and circuits. I found info (unfortunately I...
Hi M, I assume your source is a 100 MHz sine wave, with 50 ohms source impedance. You will want to match the 50 Ohms source to the impedance of your SRD at 100...
Hello everyone Thanks for a quick response to my question. Yes the source is a 100 MHz sine wave with 50 ohm impedance. My comb generator contains following...
Hi All, I have just posted in the Frequency Multiplier folder some files describing two simple bandpass filters which work nicely with a multiplier. Because...
Hello M, If you have +20 dBm at 100 MHz, you don't even need an impulse generator. This is more than enough power to drive the SRD. Remember, an SRD is an...
Scotty, Is the multiplier you use based on an actual SRD, or a PIN diode? My circuit goes with a cheap PIN diode driven by an op amp, so I don't need an SRD...
Hi Sam, I based my circuit on the SRD. It worked just fine with a few HP SRD devices I had, but could not find a source for them. So I tried several PIN's in...
Hey Scotty Thanks again for ur help i really appreciate it. yea think if i have 20dBm input it should be good enough to drive the SRD. that means only a LPF...
Hi Scotty, You're getting a lot more power from the MPN3401 than I am with an HP PIN diode. I will give that diode a try. Sam Wetterlin See HP Journal...
Scotty, Harold and All, For those interested in an actual SRD, I did find some at http://www.xs4all.nl/~barendh/Cateng/Cateng_diode.htm. One costs $22, the...
Hi All, I have been so fascinated with the multiplication process that I overlooked the simplest route: The system clock is already pretty much a square wave...
Hi Sam, Yep, the 3 dB pad does interrupt the reflection additions by 6 dB (3 dB each direction). My guess the other 4 dB loss is due to the change in line...
Scotty, I am going to ask what a slotted line is. And also offer some musings on this filter reflection thing. The concept of reflections from filters comes...
Hi Sam, You may not realize it, but you answered your own question: Q > So I have been trying to think of an alternative explanation for how a simple square...
Hi Scotty, I'm not an old timer yet, but I'm not far away. I'm not sure I entirely follow the harmonic analysis. Determining the harmonics of a periodic...
Hi Sam, I cannot find fault with your analysis. It is just fine. I was taught the same thing in school. Good old Joe Fourier. What would we do without him....
Hi Scotty, I love this stuff. It is great to correspond with someone with lots of real world experience. Myself, I am nearing retirement age but I was in the...
Hi Sam, The idea of tri-state is good. The transition time of low impedance to high impedance doesn't need to be very fast, unless of course, that is the edge...
Hi All, I obtained a high quality but somewhat bulky oscillator at an odd frequency just below 105MHz, which I ultimately intend to use as the master clock. I...
Hi Sam, I had a run-in with a Fox programmable oscillator years ago at work. It had a phase noise of about -30 dBc at 10 KHz away. Input was 10 MHz and would...
Yep. Those oscillators are meant to drive digital circuitry, and they typically use PN spreading on purpose because it helps them pass EMI mask testing...
Hi John, I suspected some spectrum spreading, because when I zeroed in with lower resolution bandwidth, the spectrum became low and wide. Even for digital...
For those interested in an actual SRD, I did find some at http://www.xs4all.nl/~barendh/Cateng/Cateng_diode.htm. One costs $22, the other $43, so I am not...
Harold, If you have a couple SRD's to spare, I would love to try them out. I'm at: 6609 Dakota Trail Edina, MN 55439 Did your 220 degree figure match the HP...
Hi All, I saw a 4-stage cavity filter at 1135MHz for sale on eBay for cheap and couldn't resist. I wanted to check out their technique. Very interesting....
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