Bob, Looks like you are getting pull-in on the relay, and that's good. Removing the relay would be pretty difficult, and I have never done it.
Yes, there are three sets of contacts: a single-pole single throw, and two single-pole double throw. First....power off, power supply unplugged from the wall, then from the radio. To clean, one would need to remove the high-voltage cage. I use a very light carborundum paper, and just one pass over the contacts, with some deoxit on there too. Then, I use just paper. The best dimensions of the strip is about 3 inches by 1/8 inch. To get the normally-open contact surfaces, I gently actuate the relay by hand by pressing down very lightly, so that the paper is caught between the contacts, then I drag it out slowly. If you don't have carborundum paper, just use the regular paper. I've cleaned a number of these TR-3 frame relays like this, and it works pretty well. Just be very careful about bending any of the contact arms !!! Let's keep the dialog going, Mark ----- Original Message ---- > From: AD5VJ Bob <[email protected]> > To: Mark Nace <[email protected]>; [email protected] > Sent: Sun, January 10, 2010 7:17:11 PM > Subject: RE: [Drakelist] TR-3 > > Hi Mark > > Yes I can rx both usb and LSB with no problem. > > The rig is supposed to switch to the sideband appropriate for the band which > it > does on all bands except for 40 meters. On 40 it > goes into usb not LSB for some reason and I have to switch it to X in order > to > get the LSB signals off of 40 meters. > > Does the relay only have the upper contacts. I can see them moving from the > top > after taking the top off, or do I have to take the > relay out in order to clean any at the bottom of the relay. > > Bob AD5VJ > > > -----Original Message----- > > From: Mark Nace [mailto:[email protected]] > > Sent: Sunday, January 10, 2010 6:44 PM > > To: AD5VJ Bob; [email protected] > > Subject: Re: [Drakelist] TR-3 > > > > Bob, > > I would first turn everything off, unhook the TR-3 from the > > power supply, and look at the frame T/R relay and make sure > > the contacts are clean. Once they are clean, I always do > > some continuity measurements on the XMIT and RCV cathode > > lines to make sure they really are making good contact. If > > this is a no-go, make sure the relay tube is actually > > energizing the relay coil. Beyond that, if the 9 MHz BFO is > > not being shifted into the SSB filter passband (upper > > sideband filter I think), then there will be no drive at all. > > Are you able to receive upper and lower sideband QSO's okay? > > > > Others will probably have more and better advice... > > > > 73 > > Mark > > N5KAE > > > > > > > > > > ----- Original Message ---- > > > From: AD5VJ Bob > > > To: [email protected] > > > Sent: Sun, January 10, 2010 6:23:34 PM > > > Subject: [Drakelist] TR-3 > > > > > > I have a TR-3 and it is working fb on rx, except when going to the > > > procedures for tuning while using a dummy load as the > > antenna, on page > > > 17 of the manual after presetting the controls as indicated, when I > > > get down to the: > > > > > > 'advance the XMTR gain control clockwise until the plate > > amperes meter > > > moves up scale slightly from idling current' > > > > > > It does not move up scale and I have no output when the function > > > switch is set to X-CW per two different watt meters I have > > put inline > > > with the dummy load. > > > > > > All the tubes light up and seem to be functioning properly. > > > > > > Any ideas? > > > > > > Bob AD5VJ > > > > > > > > > _______________________________________________ > > > Drakelist mailing list > > > [email protected] > > > http://mailman.zerobeat.net/mailman/listinfo/drakelist > > _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
