Re: [Drakelist] All band TX for the TR-7
On Tue, 11 Oct 2011 08:15:10 -0700, Jim Pruitt wrote: >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. The same thing can be accomplished by clipping the insulated jumper wire on the (old version) digital control board. Exactly the same as the Q9001 mod. A seperate trace cut on the digital control board is required to enable TX coverage in the 2.5 and 5.0 MHz bands. As noted before, this method preserves the Out Of Lock TX disable signal, which the mod published by DRAKE does not! For this reason, I do not recommend doing it the "official" Drake way, and have in fact removed that mod from a couple of rigs and re-did them with this method. Interestingly, my TR-7 had been all-banded with the Q9001 mod, and I had noticed that it didn't TX in the 2.5 and 5.0 bands, but never gave it any thought because there weren't ham frequencies there at the time. Now, of course, there is a 5 MHz allocation. 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://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] All band TX for the TR-7
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, 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] All band TX for the TR-7
There's more than one way to skin a cat. You can "fake" an AUX-7 by installing diode networks on the bottom of the parent board, similar to this: http://www.dproducts.be/drake_museum/rx_0-1_5_mhz.htm It can get ugly, but if you only want, for example, WARC bands or VLF receive, it's not too bad. 73 -Jim On Sat, 8 Oct 2011 14:05:26 -0500, David wrote: >One way to provide additional band slots for the transmit and receive is to >find and place an Aux-7 board in the radio. These are hard to find. The >solution I use on the several TR-7 units I have had is to use the scheme of >Robert Morrow, WB6GTM in the July 1982, QST. It is a diode programmable >board for any 500 KC segment. The boards I used were made by Farr radio >(probably still available) and plug into the aux 7 slot. Work fine and no >surgery is required.. -- 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://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] All band TX for the TR-7
One way to provide additional band slots for the transmit and receive is to find and place an Aux-7 board in the radio. These are hard to find. The solution I use on the several TR-7 units I have had is to use the scheme of Robert Morrow, WB6GTM in the July 1982, QST. It is a diode programmable board for any 500 KC segment. The boards I used were made by Farr radio (probably still available) and plug into the aux 7 slot. Work fine and no surgery is required.. David Assaf, III W5XU -Original Message- From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Jim Shorney Sent: Saturday, October 08, 2011 10:12 AM To: drakelist@zerobeat.net Subject: Re: [Drakelist] All band TX for the TR-7 On Sat, 8 Oct 2011 04:34:36 -0700 (PDT), Ron wrote: >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. The method I arrived at was actually an outgrowth of this mod, which I found published on GW4ALG's web site. The Q9001 mod leaves out the 2.5 and 5.0 MHz bands, but they can be restored by a trace cut on the digital control board. Since the collector of Q9001 toggles a signal on the digital control board, both mods can effectively both be done on the digital control board and the OOL signal is preserved. 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://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1831 / Virus Database: 2085/4543 - Release Date: 10/07/11 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] All band TX for the TR-7
On Sat, 8 Oct 2011 04:34:36 -0700 (PDT), Ron wrote: >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. The method I arrived at was actually an outgrowth of this mod, which I found published on GW4ALG's web site. The Q9001 mod leaves out the 2.5 and 5.0 MHz bands, but they can be restored by a trace cut on the digital control board. Since the collector of Q9001 toggles a signal on the digital control board, both mods can effectively both be done on the digital control board and the OOL signal is preserved. 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://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] All band TX for the TR-7
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
