Steve, Many tnx for your comments of today. Yes I have already checked the value of all resistors in the affected area, all OK. I think perhaps Bob - AG5Q may have the right track to my problem in his msg. of 14 Dec. I haven't had time yet to follow his advise. I will let the reflector know just as soon as my problem is solved. Tnx again. 73, Bob - VE3XM