Mark Pilant <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- The saga of the TR-3 continues ... :-)
I'm in the process of going through the receiver alignment and I've come across some "weird" things. The first concerns the 9 MHz oscillator. It does seem to be working, but the 9 MHz signal seems to be only about 20 mV P-P. (As measured on my Tek 7904 with a 7A26 vertical plugin. I.e., a high impedance load.) There isn't anything in the manual which gives the amplitude, so I don't know whether this is correct, too low, or too high. Also the adjustment variable cap (C-130) doesn't seem to have any effect. Any words of wisdom? The second problem is a bit stranger. Just after I finished the alignment I hooked the TR-3 up to my Cushcraft R-7 antenna to see what I could hear. I was able to receive a number of stations in 80m and 40m. The 40m stations were mostly SWBC. The amateur stations I could receive seemed to be a little "garbled". Similar to what you would hear when you listen to an SSB signal in AM mode. You can tell someone is talking but it sure doesn't sound right. This may be related to the 9 MHz oscillator issue. But that wasn't the end, it gets even stranger. I shut off the power so I could put the cabinet bottom on. When I turned on power, the audio was there but it was as though the audio gain was way down; and the control(s) were at the max. The s-meter seemed to be reading fine. (A 60 uV signal from my HP 8640B registers almost exactly S-9 on the meter.) Sometimes the audio is completely gone and only reappears if I switch the RV-3 on and off. Oh yes. All of the alignment I did with the chassis on its side. The strange audio problem started after I put the cabinet bottom on and oriented the chassis in the normal operating position. I do have one other thing to test. I did the alignment with the 9 MHz osc tube (6GX6) in a test socket, so it was about and inch and a half above the chassis. When I put the cabinet bottom on, I took out the test socket and put the tube in the normal socket. I want to put the test socket back in and try again. 73 - Mark N1VQW ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
