Leon, A properly working TR-7 is a joy to operate. Replace the cap Gary Poland recommended as well; although I haven't had a bad one, it can't hurt either. You may indeed have an alignment problem with the RIT. A touch-up of the frequency alignments should be done regardless. If that doesn't fix it, look at the analog switch IC on the parent board.
There should be a hole in the parent board to access the RIT adjustment pot from the bottom. The very oldest may not have had it. Plan on doing a fixed passband alignment any time you remove the DR-7 or do anything else around that front right corner. Those pots are easy to bump without even realising it. There's lots of info on the internet. Google can be your friend. Get the Drakemod document, it's a good read. Ignore all advice to reverse the direction of the fan from what Drake intended, it really does work best that way. 73 -Jim NU0C On Tue, 21 Jan 2014 06:47:53 -0800 (PST), Leon Zebrick wrote: >Jim, >Great leads. Thank you. It sounds to the ear like the problem may be exactly >what you are suggesting. Iâve been sorting out a few issues with the rig >and only two remain â the whine, and my RIT is way off. I pulled DR7 last >night for access to the RIT alignment pot, and while I donât yet have an >extender set, I took a few blind shots at getting the RIT at least into a >useable range. No luck. Seems to be out of range of the pot, suggesting a >broader alignment issue. I rarely use RIT, so this problem can be addressed >later. The whine is more of an issue. I really like the radio and have been >enjoying 60 mtr. QSOâs with my brother, Guy, in Memphis, WD5ACP; Iâm >near New Orleans. My brother and I have been hamming since the late 70âs >and my recent Drake adventures have motivated him. Heâs now awaiting >receipt of a TR-7. Once these minor issues are dealt with my rig will be >100%. The only real problem I had with the rig was transmitter instability, >which cleared with a cleaning of the ALC pot and a pot on the pre-driver >board. Iâve been comparing the receive performance to a Ten Tec Pegasus, >known to have a great receiver. The TR7 holds its own. After this Iâm >moving on to get my TR4CW into top shape. Thanks again. -- 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
