> Perhaps a little off topic subject.... Does anyone know of a > source for > 25 Ohm, 0.10" diameter flexible coax cable? I am in the process of > converting a 500 Watt Quintron QT-7095 station to 10 Meters. The RF > amplifier uses four 28V MOSFET's matched to 50 Ohms with a > Guanella 4:1 > transmission line transformer. Unfortunately, the amplifier > is tuned to > 36 MHz. The Guanella transformer gets very hot at 29 MHz while output > power is low. It looks like I may have to rewind it, but am unable to > find a source for 25 Ohm mini flexible cable. The closest thing I can > find is semi-rigid, which is no good for this application....Alex
Hello Alex, long time no talk. Microdot used to make the cable you're probably looking for. It was used in a number of Motorola application notes (ANxxx series bulletins) in amplifiers such as yours. The Quintron amplifier boards may even be based on one of those designs. Microdot was bought out by Tyco a while back, and I think they discontinued the cable line and now only make connectors and pre-assmebled cables. However, I stumbled upon: http://www.communication-concepts.com/Coax_wire.htm They have a Microdot 25 ohm coax. You might call them and see if it's the right diameter. --- Jeff WN3A
