Subject:TR-8400 channel spacing If you live in Southern California, a change to the 440 Mhz channel spacing from 25 Khz to 20 Khz could cause you some problems if you have an older 440 Mhz transceiver such as the Kenwood TR-8400. This transceiver comes from the factory with 25 Khz channel spacing and no provision for changing it - or so I thought. Since the PLL operates with a 10 Khz reference, this should allow allow a 10 Khz channel spacing. So I spent some time trying things to see if Kenwood might have somehow made provision for other channel spacings. The answer is YES! A 20 Khz channel spacing may be obtained by simply cutting a single diode. To make the modification remove the top of the transceiver and locate the microprocessor (42 pin IC). There are two diodes standing up at the end of the microprocessor nearest the side of the transceiver. The diode marked D210 (closer to pin 42) is the one to cut. Reapply power and enjoy 20 Khz channel spacing. All other transceiver features remain unchanged. If you want to get fancy - you may install a switch for either 20 or 25 Khz channel spacing. This seems to work OK but you may get some strange frequencies unless you remember to actuate the switch only when you are on an even 100 Khz channel. Both 20 Khz and 25 Khz frequencies store in memory.  Amsterdam View Our Stats   CLICK FOR A FREE DOMAIN NAMES HTTP://WWW.YOURNAME.TK FOR YOUR OWN WEBSITE IF YOU CLICK HERE AND YOU CAN VOTE FOR OUR FREE WEBSITES IN THE TOP 100 LIST  WANT A TOP RANKING ? USE THE ULTIMATE SOFTWARE SUITE FOR WEB SITE PROMOTION  FreeWebSubmissions Submit Your Site To The Web's Top 50 Search Engines For Free THE ALEXA BANNER, THIS BANNER GIVES THE DALLY STATISTICS OF THIS FREE WEB SITE The World of Free Packet Radio Software Amsterdam The World Of Free Packet Radio Software Amsterdam The Netherlands |