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: [email protected] [mailto:[email protected]] On Behalf Of Jim Shorney Sent: Saturday, October 08, 2011 10:12 AM To: [email protected] 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 [email protected] 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 [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
