I've been working on my Carrier Level (CL) Meter operation and it's very good now, except for one little thing. The readings are about 2 db higher on the bands above 8 MH. I've verified that the first mixer, its oscillator and the first variable IF are all working correctly. I've tried 6 different 6C4's and two different 6AK5's and still no difference. The voltages on the mixer are very good and the oscillator output is very good. I've also verified that the output on the second crystal oscillator is good. My CL readings below 8 MH are: 20db, 41 db, 61 db 83 db and 100 db for balanced antenna inputs of: 10 uv, 100 uv, 1 mv, 10 mv and 100 mv. I've checked all 8 bands below 8 MH and 8 above. There's a little variation in the readings, but consistent for the most part. I assume that the problem is in the first mixer circuit, but I don't see it.
Any suggestions on how to get the above and below 8 MH readings closer to each other? Regards, Larry ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
