Hi George, Thanks for the tips. We had a measured 12V at the connector attaching to the preamps and the menus were correct, so every thing indicates something was amiss on the preamp-hardware side.
I hope my colleague can get his preamps in working order. Does anybody have the device information for the AG-25 units? Thanks! Mark N8MH On Thu, Mar 18, 2010 at 12:20 AM, George Henry <[email protected]> wrote: > I should have offered this first: before suspecting the preamps, did you > enable preamp control for each band in the 910's "SET" menu? Preamp control > must be enabled before the front panel P.AMP button will switch power to the > preamp. Also, there must not be anything inline such as an SWR meter, > filter, or anything else that might block DC on the coax. > > If you hook the preamp up to the rig with a short jumper cable, you should > head a noticeable relay click from the preamp when you press & hold the > P.AMP button. > > George, KA3HSW > > > ----- Original Message ----- From: "Mark L. Hammond" > <[email protected]> > To: <[email protected]> > Sent: Wednesday, March 17, 2010 5:29 PM > Subject: [amsat-bb] Devices in Icom preamps AG-25 AG-35 > > >> Hello all, >> >> We either had two bad preamps to begin with, or they became casualties >> during transport to K4T, but regardless--the Icom preamps we took appear to >> have bad GAsFET devices in them. >> > [snip] > -- Mark L. Hammond [N8MH] _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
