On Sat, 26 Dec 2009 10:33:58 -0800, RadiosRUs wrote: >My questions now is how was the signal routed from the PTO to other parts of >the TR-7. Right now there is an unshielded wire that has RF on it. Where did >that wire go -- I guess I am asking did it ever end up in 50 Ohm coax >somewhere along in its travels. I am trying to reconcile unshielded wires, >leaky signals or wires picking up extraneous signals.
No coax. The wire connects to the parent board, where it passes through a switching diode matrix (loaded by 470 Ohms), then to one input of a ring diode mixer on the translator board. >Second question; I notice a screw that can be adjusted on the side of the PTO >that is linked to a spring loaded mechanical mechanism. This screw has been >painted with gyptol (now there is a word straight out of an ARC-5 receiver) or >maybe coil dope (another OT word) or maybe even modern epoxy. My PTO tunes >smoothly but I would like to have a little more resistance as you tune --it is >just a feel thing. Is that adjustment screw intended to provide a level of >"feel" adjustment or is it "Boy don't screw with that screw". The way it always looked to me, the screw was to adjust tension on an idler gear to "just right". There is an Allen setscrew acessible through a hole in the rear of the PTO cover that can be used to adjust tension on the lead screw and ball bearings, you could tighten it up just a little for a stiffer feel. But not too much! 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://radiojim(dot)exofire(dot)net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
