It has been a long time (pronounced 3 DECADES ) since I did the mod on my TR7 as well. I do remember that I did a bit more looking and found that there is a male pin sticking up from the motherboard and is the transmit inhibit line (going to Q9001 as I recall). So I put a piece of spaghetti/insulation/heat shrink tubing over that male pin. That stopped it from making contact when the DR7 was plugged in. That saved having to cut that trace and then jumper the break when/if I get rid of the TR7. You want to be really careful with that mod as it allows transmitting across the entire spectrum. Prior to that mod the system would not transmit out of the band. Since the WARC bands did not exist yet when the TR7 came out those bands do not work. This mod enables transmitting in the WARC bands (AND EVERYWHERE ELSE From 1.8 mhz to 30 MHZ). If using the AUX7 then the various band segment modules could be programed to allow transmit or not allow transmit depending on the presence or absence of a diode at that pin in the module. By disabling the transmit inhibit (break the connection by cutting the trace or with insulation over the pin) you eliminate any safety net you hand that might stop you from accidentally transmitting on a frequency you were listening to outside of the ham bands. Good luck. Jim Pruitt
>>> On 10/8/2011 at 4:34 AM, <wd8...@yahoo.com> wrote: Guys the other week someone ask about all band TX for the TR7. Found this method in my notes on the TR7. There is another mod which cuts PCB traces which I think also disables the PLL out of lock TX inhibit. I think this method saves that function. To enable the TR7 to transmit on all frequencies 1.5-30MHz simply unsolder the collector of Q9001 on the DR7 board. See Figures 4-1 and 4-2 in the Service Manual. It's been quite some time since I was inside my TR7 looking for this mod, but seems to my my current TR7 uses this method. _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
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