Re: [Drakelist] Question about the 9MC filters

2011-01-27 Thread kb8bku
Garey, Thanks for the explaination! I have never heard this double hump when tuning the calibrator signal in any of my Drakes (TR-3, TR-4, 4A-line twins). I assume the null that you describe tuning through is the BFO frequency, between the two filter passbands. But it would seem to me that

Re: [Drakelist] Question about the 9MC filters

2011-01-27 Thread Garey Barrell
Darryl - That's what I get for being in a hurry. Seems to be happening more often these days! :-) You are correct, you can only do one filter at a time. You can use the dial skirt as a reference, i.e., turn on the CAL, and tune to zero beat. Set the dial skirt to 0. THEN tune through

[Drakelist] Question about the 9MC filters

2011-01-25 Thread Kevin Elliott
I have been reading all of the posts in the new Drake archive and the old Drake archive trying to learn as much as I can about my TR4.  To you old pros this will be a rookie question, but I am of the belief that if you don't ask you don't learn.  Okay I have read where it has been said that you

Re: [Drakelist] Question about the 9MC filters

2011-01-25 Thread Garey Barrell
Kevin - A scope can be used, although I find it easier to just listen to the receiver. Think of the two filter passbands as the letter M as depicted on Page 29 of the TR-4 Manual. The goal is to adjust C130 so that it sits in the valley between the two filters. If you turn on the