Yes please Marvin, provide a place for us too see some more details, both of construction and of results.
Regards, Gert Gremmen, (Ing) ce-test, qualified testing =============================================== Web presence http://www.cetest.nl CE-shop http://www.cetest.nl/ce_shop.htm /-/ Compliance testing is our core business /-/ =============================================== >>-----Original Message----- >>From: [email protected] [mailto:[email protected]]On Behalf >>Of Jim Bacher >>Sent: Thursday, June 08, 2000 1:37 AM >>To: Wolak; Marvin; [email protected] >>Subject: Fwd:1-10GHz source >> >> >> >>Forwarded for Marvin >> >>____________________Reply Separator____________________ >>Subject: 1-10GHz source >>Author: "Wolak; Marvin" <[email protected]> >>Date: 6/7/00 2:47 PM >> >>A few weeks ago, there was some interest about references sources above 1 >>GHz. A few months ago I got tired of trying to find a source and made one >>myself. After some experimentation with batteries, I came up >>with a source >>which emits from 250 MHz through 10 GHz. The source emits the >>harmonics of >>250 MHz. The source is stable to about 0.3 dB over the charge of the >>batteries which is from 12 to 22 hours depending on how they were charged. >> >>The field produced by the source, as tested at 3 m, is from >>approximately 68 >>dBuV/m to 85 dBuV/m in the range of 1 to 10 GHz. >> >>If anyone would like to see plots or stability graphs, let me >>know. If the >>response is overwhelming, I'll post it. >> >>Basically, what I came up with is as follows: >> >>The box is a simple aluminum project box, a circuit described >>below, 8 NiMh >>batteries (rechargeable), and a built in charger. >> >>The circuit was put together on a circuit board using a Radio Shack etch >>kit. A 250 MHz oscillator feeds directly into a Herotek 250 MHz comb >>generator. The output of the comb generator is put through a 10 dB >>attenuator and then connected to a sma bulkhead connector using a >>short coax >>jumper cable. >> >>The antenna is a sma m-f barrel with a wire attached to the center >>conductor. A case from a ballpoint pen was screwed onto the barrel to >>protect the wire. I tapped out the end of the pen case so the connector >>would screw on. >> >>Can't remember the manufacturer of the oscillator. >> >>The comb generator from herotek, (http://www.herotek.com/), has removable >>sma connectors on the input and output. I removed the input sma and >>connected it directly to the oscillator output. >> >>All in all, the circuit draws 173 mA. >> >>The power for the above is regulated by a 5V regulator with some simple >>power decoupling and diode protection. >> >>The first pass used AA alkaline batteries. This provided for only about 6 >>hours of operation. The second pass was with 6 C rechargeable alkaline >>batteries. This provided for about 14 hours of operation but the source >>stability was poor. The output at some frequencies would increase 2-4 dB >>over the life of the charge. Another drawback was that the >>batteries had to >>be removed to charge. >> >>I've since replaced the alkaline batteries with 8 Panasonic NiMh >>batteries. >>This has solved my stability problem (I can live with 0.3 dB variability). >>To charge the batteries a bought a MaHa battery charger, disassembled it, >>and mounted its circuitry in my box. The switchover from the load of the >>circuit to the charger is done through the main double pole-double throw >>switch. >> >>If I had to do it over, I would start from the power side. The NiMh >>batteries are not the best choice for a few good reasons but that >>was what I >>was stuck with if I was to keep the same box. Lead acid may be a better >>choice, but would require a larger project box, something like the popular >>EMCO Royce field source. >> >>I would be interested in feedback. There is plenty of room for >>improvement, >>and lots of talent on this board. >> >>If you have any questions, or if something is unclear, let me know. >> >>Marvin Wolak >> >>Marconi Communications >>Senior EMC Engineer, Product Integrity >>Ph: 724-742-7453 >>Fx: 724-742-7474 >>EMail: [email protected] >> >> >>------------------------------------------- >>This message is from the IEEE EMC Society Product Safety >>Technical Committee emc-pstc discussion list. >> >>To cancel your subscription, send mail to: >> [email protected] >>with the single line: >> unsubscribe emc-pstc >> >>For help, send mail to the list administrators: >> Jim Bacher: [email protected] >> Michael Garretson: [email protected] >> >>For policy questions, send mail to: >> Richard Nute: [email protected] >> >>
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