Check out Credence Technologies: http://www.credencetech.com
Their site source is at: http://www.credencetech.com/ERS.htm and it comes pre-calibrated. I built one myself a number of years ago and the only problem with it was frequency drift. It was very simple. It used a 74123 one shot to establish a repetitive pulse, and then fed the pulse to a fast Schmitt trigger (fastest logic family available to me). The Schmitt trigger had all outputs tied together and they drove the stub antenna. To get more output at the low end, I used a collapsible rod which was extended at low frequencies. The 74123 was configured to support several different rep rates. There was something like 1 MHz or slower so that I got good frequency coverage at 30 MHz, and as fast as 5 MHz or maybe higher to get extended harmonic amplitude near 1 GHz. I used batteries and a voltage regulator to feed a constant Vcc to the logic, and had an LED that would light if the battery potential started to approach the voltage regulator output. As I recall, it could run a whole day without requiring new batteries. From: "POWELL, DOUG" <doug.pow...@aei.com> Reply-To: "POWELL, DOUG" <doug.pow...@aei.com> List-Post: emc-pstc@listserv.ieee.org List-Post: emc-pstc@listserv.ieee.org List-Post: emc-pstc@listserv.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Mon, 17 Feb 2003 14:11:52 -0700 To: "EMC-PSTC (E-mail)" <emc-p...@ieee.org> Hello all, I am searching for small package comb generator with amplitude calibrated output. Any resources you can give me are much appreciated. I will even entertain the idea of constructing one. best regards, -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA _______________________________________________________________ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc.
