Garey, I have looked why my TX seems to be "open", and it is not that single VCO unlock transistor being cut out that I could tell. This was a rig that John L had before me and I never knew the entire history.
There is an aux7 board with jumper modules in the rig, and I think there is something with it that allows out of band TX, but not sure. None the less, I was not going to attempt to TX given the strange combination of display frequencies and bandpass mis-match. Will look again at frequencies and voltages. I suppose I could make it a dedicated 80 meter rig, hi :-) 73, Ron WD8SBB --- On Sun, 1/24/10, Garey Barrell <[email protected]> wrote: > From: Garey Barrell <[email protected]> > Subject: Re: [Drakelist] TR7 acting strange > To: "Ron" <[email protected]> > Cc: [email protected] > Date: Sunday, January 24, 2010, 4:40 PM > Ron - > > You may need to recheck your frequencies. ~17 MHz is > the "target" frequency for the Lo Band VCO (through 20M), > and 34 MHz for 15 and 10. This is where the VCO's > settle when unlocked. > > First thing to check is the +24V DC supply. This > higher voltage is used for the Loop Filter and VCO > steering. If the voltage is low, check that "E" core > on the DC/DC converter transformer on the little power > supply board. > > There are other possibilities, but this is a start. > Unless the transmitter has been modified, it won't transmit > if the VCO is unlocked. > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement > CDs > <www.k4oah.com> > > > Ron wrote: > > Got a strange one going on. Finished and 80 > meter net and was headed to 40 to listen to the Drake tech > net. On 80 meters it work find. But when I go to > other bands, the display shows incorrect frequencies. > Also on using the up/down buttons it will go into strange > frequencies as well. > > > > 1.5 show 1759x.4 and counts up slowly > > 2.5 same as above > > 3.5 80 meters okay and transmits > > 5 shows 1414.x > > 7 shows 3415.x14 displays okay > > 21 shows 17415.x > > 28 ok > > > > I did not go further and attempt to TX for fear of > further injury. > > > > It would appear the VCO/PLL are messed up, but why > such strange combinations? > > > > First thing will be board removal and reseating unless > someone has a specific I should be looking for. > > > > TNX es 73, > > Ron WD8SBB > > > > _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
