A year or so ago I modified an Extron ADA 6 300MX TV distribution amplifier to house one of David Partridge's divider boards along with a 1 MHz sine-wave filter and a 10 MHz to 100 MHz multiplier after Luciano Paramithiotti's design. I use the rear BNC connectors to distribute 1, 10, & 100 MHz sine-waves. The synch channel was modified to distribute 1 MHz square-waves. On the front panel are BNC connectors for 1, 10, & 100 MHz sine-waves; 1 MHz & 5 MHz square-waves; and an output with rotary-switch-selected 1, 10, 100, 1 kHz, 10 kHz, or 100 kHz square-wave from the Partridge divider board. My ADA 6 300MX unit had conventional resistors on the board so it was relatively easy to change them to 50-ohms. I eliminated the 0.7/1.0 V switch. I found it possible to power the Partridge divider board and 10 to 100 MHz multiplier module as well as the distribution amplifier from the internal Extron power supply by adding a 12 V to 5 V inverter module (bought on eBay) and a Murata RFI filter. As modified, there is a single 10 MHz input to the assembly, and 5@ 1 MHz, 3@ 10 MHz, and 5@ 100 MHz outputs on the rear panel. There are also 5@ 1 MHz square-wave outputs from the former sync section. Connectors corresponding to the DA outputs used internally were removed and the holes fitted with plastic plugs of the correct size. To get everything to fit, I had to shift the power supply on the lid. While the Extron cases are of very fine mechanical construction, the front and rear panels are not well bonded electrically. I added bonding braids to improve the shielding and RF performance. A nice feature of these units is that the front and rear panels can be easily removed for engraving. I briefly considered trying to add miniature isolation transformers behind the connectors, but dropped the idea in view of the relatively marginal isolation between outputs, and because the amplifiers seemed to work well for my workbench application. My apology for this late comment, but I was out of town during the earlier discussion. Bruce, KG6OJI _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.