If anyone is interested, there are some decent 900 to 1200 MHZ VCOs currently being offered on Ebay. They are listed twice, at two different prices! Cheapest...
Hi All, Yes, this is a "drop-in" replacement for the ROS-1500 used in the VCO 2 or VCO 3 modules. With the exception, these are +5v Vcc devices. Just change...
Hello, I have started a Protel PCB artwork for the Spectrum Analyser using a 4 layer board. Has anyone out there done anywork with the SSA using Protel. ...
Hello again. I have been considering re-writing the SSA PC software in Microsoft Visual Studio.net. Would be a challenge that I would love. Any comments from...
Hi David, I don't know anything about Visual, which is why I chose the Liberty basic. It is similar to the only thing I know about, Commodore Basic and Rocky...
Hello. I have designed and built a couple of Touch Screen LCD displays for the SSA. It is 320 x 240 Pixel, flourescent backlite and runs off 12 volts. I...
... My 10cent's worth - DON'T DO THAT! Re-write in Java instead so that it will be usable by a wider community. I would be very happy to collaborate if you...
... software ... that it ... Hi Andy I was expecting to write software in Visual Studio C++.net. This would have produced an executable program to run on...
... David I don't use Windows - hence my interest in a Java-based implementation. However, my SSA is very unfinished as other projects keep pushing it down the...
I have one for you. I just purchased a wintv card for my computer (like watching tv while typing) has anyone ever turned one of these into a spectrum analyzer?...
I am interested in the LCD touch display and am using protel 98 and also interested in VB version of software program, can it be USB or serial?. i am slowly...
Hi Newbie, I'll answer part of your question. The Final Xtal Filter module is 50 ohm/50 ohm. The actual crystal filter in/out impedance is dependent on the...
Hi I've a heap of Minicircuits SCM-2500 DBMs on surplus boards. These are in a plastic case. Minicircuits characterise these so: Lo / RF 500 - 2500 MHz IF...
i have it now. thanks scotty. i plan to get boards done for real, with overlay and every thing. is there a drawing of the cavity filter in 'mm', Australia you...
Hi Mike, Take a look at Minicircuits page on that mixer: http://www.minicircuits.com/cgi-bin/spec?cat=mixer&model=SCM-2500&pix=yy101.gif&bv=4 It doesn't look...
None of my drawings have been done in metric. Just use the 39.36 inches = 1 meter conversion. Electrically, copper is better than brass. However, it is also...
PS. is there a plan like the one some one did with the ... GM. If the top and bottom are copper, you won't gain anything but appearance when you silver plate...
Ray, Yes, I have boards for the modular version, tested and ready. I have a 13 board panel which contains the following: 3 VCO / splitter / amplifier, 3 PLL, 1...
In response to Günter's inquiry I have uploaded some files that might be of general interest to the rest of the group. In these scanned images of the board...
Hi all, this note may not have much to do with the Spectrum Analyzer project itself, but I am sure you will find the final information quite interesting, as...
Hi All, I am in the process of building up each of Cash's boards. I have, successfully, built and tested the following: DDS, ROS VCO, Master Oscillator, Log...
Hi Everyone, I want to describe a potential problem with PLL 1 / VCO 1, and the fix for it. Using the POS-2120W, you may not have this problem, but I will...
Another alternative would be to run the OP27 as a single-supply amp, with Vee grounded. That is what I do in my own hybrid synth project. This does rule out...
Hi All, I hope I don't step on John's toes to hard, but I must give you all a caution on his suggestion (copied below). What he stated is absolutely true, for...
All very good points. I do sometimes see lock times that are 2x-3x longer than expected, which I never bothered to investigate (thinking they were due to...
Hello everyone, I'm new to this group. I have a Tek 491 SA and as it's an old 'analogue' model I am thinking of adding a centre frequency readout and possibly...
Hi Bernard, I know nothing about the 491 but if the 2nd LO is the only "mover", I would suggest just installing a frequency counter circuit on the 2nd LO....
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