Wow... sounds like a fun project if one had all the time to get around having the kpt-50. There are a number of people wanting to get around the kpt-50 requirement with a basic rib type programmer.
But I've always removed the eeprom and used the the kpt-50 along with the kpg-21d software to keep from using the kpt-50 key-pad again. I believe the sub tone/dcs information is kept in the eeprom. If you're local to me near Sacramento, I'll program your repeater to the ham bands for free. If you really needed to get the eprom done, I'd even help you by mail. I also keep the kpt-50 in stock (I'm an Authorized Kenwood Dealer). Email me direct if you want more information. I've run the tkr-720 and tkr-820 in both carrier squelch, with a tone panel (external) and with a trunking controller. The factory repeater board doesn't generate true reverse burst. Like other mfgrs did... the tone is often shut off before the transmitter drops and the detector tries to close the audio of before the tx drops. Aside from some of my personal connection notes, one of the better external controller mods was posted by Mike a short time back. You simply unplug the the repeater board and run a number of small plug jumpers as directed in the information. Yes, if you make up a kpt-50 work around, it will be quite popular. Hope that helps a bit. cheers, skipp skipp025 at yahoo.com www.radiowrench.com > "Jim B." <[EMAIL PROTECTED]> wrote: > > Steve Bosshard (NU5D) wrote: > > > There is a 9346 eeprom on the signaling board. Seems like removing this > > chip will make the radio CS. Will be glad to pgm tones/dcs if u want to > > send the chip. Freq info is contained in a 9346 on the front panel pcb and > > soldered into place. If you remove and socket this chip, I can also pgm it > > in my kpt20 box. Set VCO's for 4.0V or as close as u can get, touch up the > > front end, there are 3 pots for tx deviation, one is max dev - I usually set > > a 4.0 with a loud voice into the mic, then mic gain for the desk mic, then > > bal squares up dcs data. On the sig board I set rept for 2K in / 2K out. > > Set hang time for 0, and add a 10mf cap between lead 3 and gnd on the sig bd > > connector, and this will yield hang time without tone for a quiet turnoff to > > the mobiles (if you choose to use tone). Usually set the pot on the tx > > level control for 20 Watts before duplexer and have not had trouble. Lemme > > know if I can be of any further assistance, Steve NU5D - ps - makes a nice > > repeater in 70cm fm - just add an ID8 board and go.Also rpt button has to be > > pressed...ssb > > You DO know the TKR-820 generates reverse burst? > > > > > From: Repeater-Builder@yahoogroups.com > > [mailto:[EMAIL PROTECTED] On Behalf Of DCFluX > > Sent: Wednesday, December 14, 2005 1:12 AM > > To: Repeater-Builder@yahoogroups.com > > Subject: [Repeater-Builder] Kenwood TKR-820 > > > > > > > > * Hello All, > > > > I am in the process of brute force hacking a Kenwood TKR-820 into the ham > > bands. No one seems to be forth coming with a schematic of the KPT-50 so I > > have a cable ghettoed to the back of this laptop going to the serial eeprom > > on the front board. > > > > So far I have been able to program the dual synthisizers to the test > > frequency of 446.3TX and 441.3RX, simple formula, Target frequency in Khz > > (446300) minus 21400 divided by 12.5 then converted to hexidecimal for both > > synthisizers. > > The reason is that it has it's own uP in it with custom software. So a > scehmatic will not allow you to build your own. > Either a KPT-20 or KPT-50 is need to program those. No way around it. > Unless you want to go through the trouble of reverse engineering the > code in the EEPROM. If you're successful at that though, write up what > you get and post it to RB! > > -- > Jim Barbour > WD8CHL > 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/
