On 1/31/2010 1:55 PM, Don Wilhelm wrote: > Since the question was about what signal generators we have, I thought I > would add the list of what I have here - some have specific purposes > while others are general purpose. > > I have several signal generators. The two most important properties of > a signal generator (for me) are frequency stability and clean sine-wave > output. If one has attenuators, then control of the output level is not > a requirement as long as the generator level is steady. > Generators that I have available > - A homebrew generator with about 10 dBm output (variable in steps down > to about -20 dBm - the design is the dual range generator shown in > Experimental Methods for RF Design. This was built in an ARC-5 > transmitter frame so it has mechanical stability lots of bandspread with > the geared tuning capacitor(s) drive. and covers from about 3 MHz to 50 MHz. > - A DDS vfo that is controlled by the parallel port on the workshop > computer 100 Hz to 30 MHz in 1 Hz steps. Very stable and no warm-up > drift. No level adjustment on the output, uses the AmQRP DDS kit as its > basis. > - A high level generator as shown in the K1 and K2 manuals > (Troubleshooting section). I used a plug-in crystal so I can change > input frequencies easily. > - The Elecraft XG2 for calibrating S-meters and doing MDS related > measurements. > - An HP8640B - this is my main workhorse generator, it has very low > phase noise, and is quite stable after a 2 hour warmup period plus it > has AM and FM modulation and provisions for sweeping it if required. It > goes down to 500 kHz and up to 512 MHz. It is very well shielded so > there is no leakage and the output level can be adjusted from a high of > +23 dBm to -140 dBm with its internal attenuator. > - In addition, I have my K2 and a few QRP transmitters which can also > serve as a high level signal generator within the ham bands, and yes, I > can use the output from my MFJ259B or my Micro908 antenna analyzers as a > useful signal source in many cases. The generator I choose depends on > what I am trying to accomplish. > > Get a copy of Experimental Methods in RF Design and turn to the > Measurements chapter if you have a mind to build a generator, several > are detailed there. > > I might also mention that I have a LOT of 28.322 MHz oscillators if > anyone wants to use one as a base for a signal generator (think about a > divider followed by a Low Pass Filter. I can mail one to you for $3. > > 73, > Don W3FPR > > > > >> "SO figure I would query the group to see what everyone else is using. IF >> your using a signal / RF generator, what brand, model and options are you >> using ???" >> >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.432 / Virus Database: 271.1.1/2659 - Release Date: 01/31/10 > 06:39:00 > > Don,
Thank you for the description of the signal generators that you use. The book "Experimental Methods in RF Design" you reference for one generator design is an ARRL publication and is available from ARRL for $49.95. The ARRL web page is http://www.arrl.org/catalog/?words=Experimental+Methods+in+RF+Design. Do be wary of Amazon for they are offering the same book for from $500 to $1100 as can be seen here: http://www.amazon.com/gp/offer-listing/0872598799/ref=dp_olp_0?ie=UTF8&condition=all. I was unable to figure out how to let Amazon know of their mistake. Don, N0YE ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
