Hello Erling: The tuning procedure you reference in the Drake manual for the T-4XC is a bit ambiguous and is a dangerous procedure when executed incorrectly. There are high voltages present on the wafer switch which can induce an unpleasant shock and if you accidentally short a terminal, you could damage other components that may be difficult to troubleshoot. The purpose of the procedure is to detune T5 so that adjusting the injection oscillator trimmer presents a more pronounced peak when in resonance.
This alignment method works very well when done properly and does provide a more accurate trimmer peak, however, you can get "close enough" without following the detune procedure by simply tuning the injection trimmer for the best peak presented. If you should choose to follow the prescribed alignment procedure, you MUST use an insulated screwdriver, securely set against the proper switch lug and hold it in place while you adjust the trimmer. When you touch the screwdriver tip to the lug, you will see a pronounced drop in plate current. Peak the trimmer for maximum then remove the screwdriver from the switch lug. Regarding setting the slugs to the right heights: I am assuming you are referring to the adjustable slugs and not to the transformer slugs present in the IF chain. I have yet to find a T-4XC that required setting these slugs and would strongly suggest that you leave them set as they came from the factory, unless they are seriously out of spec. These slugs are difficult to tune properly and do not as a general rule, require adjustment. You could do more damage than good if you attempt this part of the alignment. Of course there are many different opinions on this subject and no doubt there are others who will have a different viewpoint. As in all things, your mileage may vary. Good luck and best regards; Gene W5DDW Gene McCalmont 270 Oakridge Road Argyle Texas 76226 ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
