Jeff, I got your response. There was no problem. Thanks for the help. I've made great progress with the amplfier. I probably don't need the cable.... Alex
--- In [email protected], "Jeff DePolo" <[EMAIL PROTECTED]> wrote: > > > I sent several emails to the list last week that never showed up. This is > one of them...anyone else have problems? > > > 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 >
