Bob, The Q-4 transistor is directly behind the final transistor and is a flat pack device. Follow the circuit backwards from the final and there is a black or dark grey transistor, can't miss it. It is a strange deal, it looks like it's supposed to be heat sinked to the casting through the PC board but I could tell the PC board was not making contact with the pad on the casting. I can post a picture of both PC board if that will help.
If you are using the repeater at 462 MHz you should have full rated power, if not see your local Kenwood dealer. If you have the old design you need to see them anyway and get the PA deck updated anyway. They should be happy to do it since they make 82 bucks in labor and the part cost them or you a penny. Paul -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of rtoplus Sent: Tuesday, April 19, 2005 9:08 AM To: [email protected] Subject: [Repeater-Builder] Re: Kenwood TKR-850 repeater questions --- In [email protected], "Paul Finch" <[EMAIL PROTECTED]> wrote: > Hello, > > If it has the "New Improved" PA deck and he is below 450 MHz using one of > the 450 to 470 MHz split radios is the problem. You can tell the new PA > deck from the old by the Q-4 driver transistor. The old style was not > screwed into the casting, It's a surface mount looking thing. The new > driver is screwed to the casting and they also have copper colored "springs" > over the top of both the driver and final transistors. > > I just did 5 of these updates to my TKR-850's and tested them all on 442.15, > none made rated power there but did above 450 MHz. To prove this he can > always program the radio to a higher frequency and check it there. > > Paul > WB5IDM > > > Hi Paul I'll be using the unit at 462 and that is where I've been trying to set the power at via software. The question I posed about amateur frequencies was for my own info. I can't find a Q4 transister but do have a Q5 # K3478 that has screws at the top and bottom of it. Bob, GMRS WPVV845, Amateur KG4WAD, LMRS WPXC892 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/
