I forgot to add this on my last post.
Nobody asked about a good pre-amp for use with that bias tee, but my favorite for this application is a Nuwaves HILNAV1 pre-amp; really low 0.8 dB NF, and they will sell you the bare-board pre-amp, so you don't have to mess with the big heat sink and case (you really don't need a heat sink, as it only draws about 70 mA @ 12 VDC). Also, if you ask them, they will give you a customized pre-amp that starts at 30 MHz instead of the advertised 50 MHz (top end is 1500 MHz, but I only used this to 1 GHz). Cost was only around $275 IIRC. http://nuwaves.com/products/low-noise-amplifiers/ You can combine this pre-amp with the MiniCircuits bias tee in a small aluminum project box (aluminum tape the seams) and hang it by its coax connector to the antenna RF port. Obviously, since the pre-amp and two bias tees are in the signal chain, you will need to do a thorough characterization of path loss, but since the finished test aid is so portable, my external metrology lab had no problem with calibrating the cable, injection tee, extraction tee and pre-amp as a single system, and at no charge beyond what they normally charged me for a cable calibration. Ed Price WB6WSN Chula Vista, CA USA - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
