Hi All, I am in the process of changing over to the new Web Site. The address is at.. http://www.cpu-net.com/host/wsprowls/ It is going to take a few days...
Hi, I would like to let the group know that I have made an effort to have several set of kits ready for immediate shipment. The Foundation Kits, Tracking...
Cash, Do you have the complete kit for the Vector Network Analyser yet ? Kind Regards David Huisman General Manager ... ORBIT COMMUNICATIONS Pty Ltd - Wireless...
Hi ALL, I have a problem with the PLL's I&II they dont provide any control voltage to the VCO's. Iam using the parallel control board MSA REV A,8 bit and...
Hi Chris, I assume you meant version 110 software. And, I'm sure you have changed the Global variables to conform to your MSA. Send me your changed software,...
David, The design prototyping is still undergoing a bit tweeking, Sam Wetterlin has been doing extensive work with Scotty's design, with some input on logical ...
The "Construction and Components of the MSA" section of the spectrum analyzer main page contains this excerpt: "Each module, except the Control Module, must be...
Steve, That's correct. If you look at the board layouts you can see that virtually 100% of the top side is copper and that the RF and power / signals are about...
Scotty, thanks for taking the time to check my global variable set .Once you had pointed out that I had reversed the phase setting on both PLL1&2 ,the project...
Hi Chris, I see the old solder grimlen got you. Been there, done that.(grin) Your other two abnormalities are a ponderance. At "0" center frequency and "0"...
Thanks Scotty, I did as you suggested. The results are as following: Zero centre /zero sweep---A full width display with lots of trace extensions (hairs)...
Hi Chris, I may be wrong, but with all the info you have given, I think you have more than just one problem. It may be that both PLL's are the problem. (Not...
Hi All, I've been checking this project out for a week or two now. Very nice! I've started building the filter, just waiting on some brass stock to show up....
Another question I have.... I think I already know what the answer will be, but please take it easy on me :) I am a little concerned about the inefficiency...
Hi Todd, I must agree the efficiency of this power distribution is not great. But, I was striving for power suppy cleanliness more than anything. VCO's have a...
Thanks for the response on the power supply question Scotty. I think I've decided on LT1764A series of linear regulators. I almost have all the library parts...
Hi, I just wanted to wish the group a happy new year and wish you all success in your lives and with this occasionly frustrating project.I'd also like to thank...
Would two of these work for the bandpass filter? The seller states that you can set the notch frequency anywhere in the range of 800 to 1100MHz with a notch of...
Would two of these work for the bandpass filter? The seller states that you can set the notch frequency anywhere in the range of 800 to 1100MHz with a notch of...
Dale, I don't think that this is the one for the First filter in the SSA. You need a narrow band pass filter not a notch filter. The width is also very wide ...
I also have a question along these lines... not about the ebay items, but about alternatives to the cavity filter. This is a ceramic bandpass filter that...
Looking at the ad9850 schematic, I was wondering why there are no dc blocking caps between the ad9850 IOUT pins and the transformer. Is the need just not...
Todd, The concept is good, but that filter has max attenuation of about 45db. You could combine two of them, though as I recall they are pricey. A final IF of...
Todd, I don't have the schematic in front of me, but the DDS devices are in fact current output devices, producing a current proportional to the desired...
Hi Dale and All, I went to the ebay site and looked at the filter. What is very interesting about this ebay filter is that it looks to have the correct...
Sam, Thanks for the responses today. With your comments and an AD app note I have been looking through, I understand this much better now. I wasn't sure...
Todd, The balun transformer is not required in the SSA implementation. It is an option that was added so that the boards could be used for other modular ...
Sam, Thanks for the tip on the 1.575Ghz filters! (apparently intended for GPS). Abracon has some (distributed by Mouser) with +/- 1.2Mhz BW and 40-50dB...
Scotty, I'm curious about that one. So you run the input into the input, connect the input to the output, and take the output from the output, and the cavity...
Hi Sam, Yep, you got it. Depending on the coaxial cavity being 1/4 or 1/2 wavelength, the coaxial cable coupling the input to output will be either 1/4 or 1/2...
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