Steve, I have to wonder why anyone would want to hook up an external controller to an R1225 radio, when it has a very capable controller built-in. And that may be at the heart of your problem. I suspect that both the internal and the external controller are trying to do the same thing at the same time. If your RC-210 is supplying the PL tone, make certain that the R1225 is not also generating tone, and vice-versa. I'm not familiar with the RC-210, but check to see if it is equipped with a high-pass filter that blocks the PL tone from passing through the repeated audio chain. Even if the R1225 is not encoding tone, an over-deviated PL tone on a user input can sound quite raspy on the output if not filtered.
As has been discussed many times on this list, the majority of Amateur-grade mobile and portable radios seem to be delivered with very "hot" CTCSS deviation- sometimes as high as 1500 Hz, when it really should be in the 500 to 750 Hz range. When the CTCSS tone generation circuit in a user radio produces other than a pure sine wave, the tone is so distorted that it sounds very loud and raspy. Try setting up a commercial-grade radio on your repeater pair to see if the buzz is still there. Also, try setting up both the controller and the R1225 as carrier squelch, and test again. Careful shielding of your audio cables and separation of power and signal grounds may help. Also, make certain that the R1225 is programmed as a Base Station, not a repeater. When an external controller is used, the R1225 must do nothing at all besides act as a full-duplex radio. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Steve Allred Sent: Monday, November 12, 2007 9:19 AM To: [email protected] Subject: [Repeater-Builder] GR1225 Hi guys, I need your help on a UHF GR-1225 that has me baffled. There is a audio buzz (high pitched) that appears on the repeated signal. It is NOT on the hang time, so it's not comming from the power supply, controller (RC-210), exciter or PA.. It is only present when a signal is applyed to the input (service monitor or HT) of the receiver. Also, it was not there when i had it configured as a repeater using the internal GR1225 controller. Any ideas? Did i short out a wire and kill something in the audio section of the receiver or ????? HELP! Thanks! Steve / K6SCA __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
