Eric, You might try to add some type of basic rf detection circuit to the PA Module. When the repeater tx fails, see if the PA is receiving the proper drive level.
PA Modules are always around, RF Parts is only one of many sources. Since you mention the unit does return to full power, I might suggest two items. First is a cold solder joint, the location a bit of work to find. Another option is the synthesizer, which has been known to be a problem in certain model Icom UHF repeaters. We would need more information to get you closer into the problem. cheers skipp www.radiowrench.com > "Eric Struble" <[EMAIL PROTECTED]> wrote: > After not receiving any responses for this question I decided to contact > Icom to see if they had any ideas. Their response was that there are no > parts available for those PAs (either 25 or 50 watt version). So, if you > have one, make sure you have adequate protection on the output. > > I didn't search for any of the generic parts to see if you could second > source them, my I guess is no. > > Eric > > > ----- Original Message ----- > From: "Eric Struble" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Monday, May 17, 2004 4:10 PM > Subject: [Repeater-Builder] Icom IC-RP4020 Power Problems > > > This might be a FAQ but, I am new to the group and when I searched the > archives I didn't find any reference to it. > > I have an Icom IC-RP4020 (50 Watt Version) that has an intermittent transmit > problem. The repeater works fine for weeks but then just dies; no power > output at all (either by enabling it from the controller SEND or PTT from > the local mike). I removed from the repeater rack and had it on the bench to > attempt to locate the problem. At first there was no output but while > looking around and pressing the LOCAL INHIBIT switch it came back to life. > That switch shouldn't have effected anything I was doing. From the best I > can deduce, the exciter is active during the failure. I was unable to > measure the T8 voltage prior to it working again. All the components and > traces look good on the PA module. The only strange thing I notice is that > if the repeater has been inoperative for a while and things have had a > chance to cool the output power is about 44 watts, after I hold down the PTT > for about 30 seconds the power increases to about 50 watts. I tried to > exercise the power adjustment pot to see if that might have gotten onto a > bad spot, no effect. > > So, after all my rambling, has anyone seen a similar problem with any other > Icom repeater? > > Thanks, > Eric > > > > > > > > > Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
